PART 1755 -- TELECOMMUNICATIONS STANDARDS AND SPECIFICATIONS FOR MATERIALS, EQUIPMENT AND CONSTRUCTION Sec. 1755.1 -- 1755.2 [Reserved] 1755.3 Field trials. 1755.4 -- 1755.92 [Reserved] 1755.93 List of standard forms of telecommunications contracts. 1755.94 -- 1755.96 [Reserved] 1755.97 Incorporation by reference of telephone standards and specifications. 1755.98 List of telephone standards and specifications included in other 7 CFR parts. 1755.99 -- 1755.199 [Reserved] 1755.200 RUS standard for splicing copper and fiber optic cables. 1755.201 -- 1755.369 [Reserved] 1755.370 RUS specification for seven wire galvanized steel strand. 1755.371 -- 1755.389 [Reserved] 1755.390 RUS specifications for filled telephone cables. 1755.391 -- 1755.396 [Reserved] 1755.397 RUS performance specification for line concentrators. 1755.398 -- 1755.521 [Reserved] 1755.522 RUS general specifications for digital, stored program controlled central office equipment. 1755.523 -- 1755.524 [Reserved] 1755.525 Form 525, central office equipment contract (including installation.) 1755.526 -- 1755.859 [Reserved] 1755.860 RUS specification for filled buried wires. 1755.861 -- 1755.869 [Reserved] 1755.870 RUS specification for terminating cables. 1755.871 -- 1755.889 [Reserved] 1755.890 RUS specification for filled telephone cables with expanded insulation. 1755.900 RUS specification for filled fiber optic cables. 1755.910 RUS specification for outside plant housings and serving area interface systems. Authority: 7 U.S.C. 901 et seq., 1921 et seq., 6941 et seq. Editorial Note: Nomenclature changes to part 1755 appear at 55 FR 39397, Sept. 27, 1990. __1755.1 -- 1755.2 [Reserved] _1755.3 Field trials. (a) Except as covered in Bulletin 345 - 3, no loan funds shall be advanced for any product if any item to be included in the project is not included in the ``List of Materials Acceptable for Use on Telephone Systems of RUS Borrowers,'' RUS Bulletin 344 - 2. When new items of materials or equipment are considered for acceptance by RUS or when a previously accepted item has been subjected to such major modifications that its suitability cannot be determined based on laboratory data and/or field experience, a field trial shall be required if RUS so determines. This field trial consists of limited field installations of the materials or equipment in closely monitored situations designed to determine, to RUS's satisfaction, their operational effectiveness under actual field conditions. Field trials are to be used only as a means for determining, to RUS's satisfaction, the operational effectiveness of a new or revised product under actual field conditions. Both the manufacturer and borrower are responsible for assuring that the field trial is carried out and that the required information on the product's performance is received by RUS in a timely manner. The use of materials or equipment derived from new inventions or concepts untried within the telephone industry is defined as ``an experiment'' and shall be handled as a special case using procedures considered appropriate by RUS to meet the individual experiment. (b) To qualify for a field trial, the new and improved materials and equipment must appear to RUS to offer one or more of the following benefits: (1) Improved performance. (2) Decreased cost. (3) Broader application. (c) The item of material or equipment subject to field trial may be only part of the total amount of materials or equipment included in a bid or it may be the key component of the facility or system provided; therefore, RUS shall have authority to require that a satisfactory plan be provided to maintain or restore service in the event that the materials and equipment fail to meet established performance requirements. RUS shall limit the quantity of new materials and equipment installed on any field trial and shall also limit the number of field trials for a given product to what RUS considers reasonable to provide the necessary information. (d) A borrower may participate in a field trial only if, in RUS's opinion, the borrower possesses: (1) Adequate financial resources so that no delay in the project will result from lack of funds. (2) The financial stability to overcome difficulties which may result from an unsuccessful field trial. The borrower must be able to restore and maintain service until the manufacturer meets its financial obligations with respect to the field trial. (3) Qualified personnel to enable it to discharge its responsibilities. (4) A record satisfactory to RUS for maintaining equipment and plant facilities and for providing RUS with information when requested. (5) Willingness to participate in the field trial and awareness of the effort and responsibility this entails. (e) The test site for the field trial shall be, in RUS's opinion, readily accessible and provide the conditions, such as temperature extremes, high probability of lightning damage, etc., for which the product is being evaluated. The material or equipment involved shall be covered by an RUS specification or a suitable standard acceptable to RUS. The supplier is required to submit test data to show conformance with the applicable specification or standard. Further testing shall be performed if required by RUS personnel. (f) A field trial shall normally continue for a minimum of six months, or for a longer period of time determined by RUS to be required to obtain conclusive data that the item either fulfills all requirements or is unacceptable. Either the borrower or supplier may terminate a field trial at any time, in accordance with their contractual agreement. Such termination, if prior to the time required by RUS, shall constitute withdrawal of the product from consideration by RUS. RUS has authority to terminate field trials based on its determination that the equipment is not performing satisfactorily and that this lack of performance may, in RUS's opinion, cause service degradation or hazards to life or property. (g) Field trials shall be conducted in accordance with the instructions set forth in this regulation and the agreement relating to the specific application. Both the supplier and the borrower shall agree, and obtain RUS approval before the start of the trial, on the following: (1) The specific purpose of the field trial; (2) Ownership of items during trial; (3) Starting date and duration; (4) Responsibility for costs and removal of items in the event of noncompliance with the specification or purpose intended and arrangements for service continuity or restoration; (5) Responsibility for testing, test equipment and normal operation and maintenance during the trial period; (6) Availability of test equipment on site during the trial period; and (7) Responsibility for spare parts and components consumed during the trial period. (h) Both the supplier and the borrower shall keep RUS informed of the status of a field trial. These reports shall not be limited to details of problems of failures encountered during installation and subsequent operation but shall include information on progress of the field trial. If these reports are not received in accordance with the requirements of the RUS Form 399b, RUS shall have the authority to deny or suspend loan funds related to these products until the delinquent reports are received. (i) Before a borrower purchases materials or equipment that require a field trial, prior approval must be obtained from RUS and RUS Form 399b, RUS Telecommunications Equipment Field Trial (available from the Director, Administrative Services Division, Rural Utilities Service, Room 0175, South Building, U.S. Department of Agriculture, Washington, DC 20250) will be completed by RUS and must be signed by both the borrower and supplier as an indication that they understand their responsibilities in the field trial. Assurance must also be obtained from RUS that the ``particular item'' that is the subject of the field test is eligible for a field trial. To obtain this assurance, any proposal for use of an item on a field trial basis shall be forwarded to the Chief, Area Engineering Branch, for review and approval. (j) Procedures for establishing field trials for the various categories of equipment after RUS has approved the 399b: (1) Electronic transmission equipment. The procedure set forth in Bulletin 385 - 2 ``Purchasing and Installing Special Electronic Equipment'' shall be followed except that the Special Equipment Contract (Including Installation), RUS Form 397, shall be used in all purchases of electronic equipment for field trials. In addition, the borrower and supplier shall execute three copies of a ``Supplemental Agreement to Equipment Contract for Field Trial,'' RUS Form 399, or a ``Supplemental Agreement to Equipment Contract for Field Trial (Secondary -- Delivery, Installation, Operation)'', RUS Form 399a, as well as three copies of the RUS Form 399b, ``RUS Telecommunications Equipment Field Trial'', and forward them, together with three copies of the executed contract and specifications, to the Chief, Area Engineering Branch. A limited number of copies of RUS Forms 399, 399a, and 399b are available from RUS upon request from the Director, Administrative Services Division, Rural Utilities Service, Room 0175, South Building, U.S. Department of Agriculture, Washington, DC 20250. Additional copies may be reproduced by the user as needed. This category includes: (i) Voice frequency repeaters; (ii) Trunk carriers; (iii) Subscriber carrier; (iv) Point-to-point radio (Microwave); (v) Coaxial cable system electronics; (vi) Fiber optic cable system electronics; (vii) Multiplex equipment; (viii) Mobile and fixed radiotelephone; and (ix) Other items of electronic equipment associated with transmission. (2) Central office equipment. The procedure set forth in Bulletin 384 - 1 ``Purchasing and Installing Central Office Equipment'' shall be followed except that ``The Central Office Equipment Contract (Including Installation)'', RUS Form 525, shall be used to purchase switching equipment for field trials. In addition, the borrower and supplier shall execute three copies of a ``Supplemental Agreement to Equipment Contract for Field Trial,'' RUS Form 399, or a ``Supplemental Agreement to Equipment Contract for Field Trial (Secondary -- Delivery, Installation, Operation)'', RUS Form 399a, as the case may be, as well as three copies of the RUS Form 399b, ``RUS Telecommunications Equipment Field Trial'', and forward them, together with three copies of the executed contract and specification to the Chief, Area Engineering Branch. This category includes: (i) Central office dial equipment; (ii) Direct distance dialing equipment; (iii) Automatic number identification equipment; (iv) Line concentrators; (v) Remote switching equipment; and (vi) All other items of equipment associated with switching equipment, such as loop extenders. (3) Protection equipment and materials, outside plant equipment and materials, and all other equipment and materials, which includes all items not covered in paragraph (j) (1) or (2) of this section, shall be handled as described in Bulletin 344 - 1 ``Methods of Purchasing Materials and Equipment for Use on Systems of Telephone Borrowers'' except that the borrower's purchase order form is to be used for purchasing materials and equipment in these categories. In addition, the borrower and supplier shall execute three copies of the ``Supplemental Agreement to Equipment Contract for Field Trial,'' RUS Form 399, or a ``Supplemental Agreement to Equipment Contract for Field Trial (Secondary -- Delivery, Installation, Operation)'', RUS Form 399a, as the case may be, as well as three copies of the RUS Form 399b, ``RUS Telecommunications Field Trial'', and forward them, together with three copies of the purchase order to the Chief, Area Engineering Branch. (k) For all items except Electronic Central Office Equipment, suppliers and manufacturers must furnish warranties or guarantees satisfactory to RUS against the failure of the material and equipment used in the field trial. Terms of this warranty must not be less than the provisions of the standard warranty included in the ``Telephone System Construction Contract'', RUS Form 515, or the warranty provided for similar materials and equipment included in the ``List of Materials Acceptable for Use on Telephone Systems of RUS Borrowers'', RUS Bulletin 344 - 2. In lieu of a warranty, materials and equipment are sometimes furnished to RUS borrowers on a reduced or no cost basis. Terms of such arrangements are subject to RUS approval and should be fully covered in field trial proposals forwarded by borrowers to the Chief, Area Engineering Branch for review and approval. For the purchase of electronic central office equipment, suppliers and manufacturers are to provide warranties as provided in the applicable RUS contract form: RUS Form 397 for electronic equipment and RUS Form 525 for central office equipment. Forms 399 and 399a, which apply to field trials of these devices, specify that the term of the warranty does not begin until the satisfactory conclusion of the field trial. [49 FR 28394, July 12, 1984. Redesignated at 55 FR 39397, Sept. 27, 1990] __1755.4 -- 1755.92 [Reserved] _1755.93 List of standard forms of telecommunications contracts. Following is a list of the current standard forms of contracts that RUS prepared for use by telephone borrowers when procuring engineering and architectural services, purchasing telephone materials and equipment, and constructing telephone facilities with RUS loan funds. Copies of the contract forms are available from the sources indicated in the listing. A notice of any change in these contract forms will be published in the Federal Register. The terms ``RUS form'', ``RUS standard form'', ``RUS specification'', and ``RUS bulletin'' have the same meanings as the terms ``REA form'', ``REA standard form'', ``REA specification'', and ``REA (TABLE START)bulletin'', respectively, unless otherwise indicated. @h1RUS Form No. @h1Issue date @h1Title @h1Purpose @h1Source of copies 165 .... 9 - 69 .... Architectural Services Contract -- Telephone .... Used to engage the services of an architect .... RUS.\1\ 168b .... 3 - 62 .... Contractor's Bond .... Used in RUS Form 515 when the contract exceeds $100,000 .... Copy in the Form 515 Contract. 168c .... 4 - 79 .... Contractor's Bond .... Used when the contractor's surety has accepted a Small Business Administration guarantee and the contract is for $1 million or less .... RUS.\1\ 217 .... 7 - 81 .... Postloan Engineering Service Contract, Telephone System and Construction .... Used to engage the services of a consulting engineer to perform the postloan engineering services .... RUS.\1\ 238 .... 4 - 72 .... Construction or Equipment Contract Amendment .... Amending the Building Contract RUS Form 257; Special Equipment Contracts, RUS Forms 397 and 398; Telephone Equipment Contract (Installation Only), RUS Form 400; Central Office Equipment Contracts, RUS Forms 525 and 545 .... RUS.\1\ 242 .... 11 - 58 .... Assignment of Engineering Service Contract .... Used to transfer the responsibilities of completing the performance of the engineering service contract to another company .... RUS.\1\ 245 .... 11 - 75 .... Engineering Service Contract, Special Services -- Telephone .... Used to engage a consulting engineer to perform special services .... RUS.\1\ 257 .... 3 - 73 .... Contract to Construct Buildings .... Building construction .... Supt. of Doc., GPO, Wash., DC 20402.\2\ 257a .... 10 - 69 .... Contractor's Bond .... Used in RUS Form 257 .... Copy in the Form 257 Contract. 270 .... 7 - 70 .... Equal Opportunity Addendum .... Addendum to Construction and Equipment Contracts not having current equal opportunity provisions .... RUS.\1\ 282 .... 11 - 53 .... Subcontract .... Subcontracting a portion of construction under a construction contract requires approval of the borrower, surety and RUS prior to subcontracting .... RUS.\1\ 307 .... 4 - 60 .... Bid Bond .... Bid proposals on RUS Forms 257, 515, and 525 require either a bid bond or a certified check in an amount equal to ten percent of the maximum bid price .... Copies in each of the contracts. 397 .... 12 - 67 .... Special Equipment Contract (Including Installation) .... Purchase and installation of voice frequency repeaters, trunk carrier, subscriber carrier, microwave, mobile radio, line concentrators, and other items of electronic equipment associated with transmission .... RUS.\1\ 397f .... 2 - 63 .... Contractor's Bond (Special Telephone Equipment) .... Used in RUS Form 397 when the contract exceeds $100,000 .... Copy in the Form 397 Contract. No form number .... 7 - 78 .... Addendum No. 1 to RUS Form 397, Special Equipment Contract (Including Installation) .... Incorporates the liquidated damages provision into the 397 contract .... RUS.\1\ 398 .... 11 - 62 .... Special Equipment Contract (Not Incl. Installation) .... Purchase and deliver voice frequency repeaters, trunk carrier, subscriber carrier, microwave, mobile radio, line concentrators, and other items of electronic equipment associated with transmission .... RUS.\1\ 399 .... 8 - 82 .... Supplemental Agreement to Equipment Contract for Field Trial .... Used in any contract that contains material or equipment that requires a field trial and has primary status .... RUS.\1\ 399a .... 8 - 82 .... Supplemental Agreement to Equipment Contract for Field Trial (Secondary -- Delivery, Installation, Operation) .... Used in any contract that contains material or equipment that requires a field trial and is the secondary field trial category .... RUS.\1\ 400 .... 10 - 65 .... Telephone Equipment Contract (Installation Only) .... Used where the contract will cover only the installation of equipment .... RUS.\1\ 400a .... 10 - 65 .... Contractor's Bond (Telephone Equipment Contract -- Installation Only) .... Used in RUS Form 400 when the contract exceeds $100,000 .... Copy in the Form 400 Contract. 515 .... 1 - 90 .... Telephone System Construction Contract (Labor and Materials) .... Telephone outside plant construction, including direct buried plant, conduit and manholes, underground cable, pole lines, aerial cable, service entrances and station protector .... Supt. of Doc., GPO, Wash DC 20402.\2\ 525 .... 7 - 94 .... Central Office Equipment Contract (Including Installation) .... Purchase and Installation of central office switching equipment .... RUS.\1\ 525a .... 10 - 62 .... Contractor's Bond (Central Office Equipment) .... Used in RUS Form 525 when the contracts exceed $100,000 .... Copy in the Form 525 Contract. No form number .... 8 - 79 .... Addendum No. 1 to RUS Form 525, Central Office Equipment Contract (Including Installation) .... Incorporates the liquidated damages provision into the 525 contract .... RUS.\1\ 526 .... 8 - 66 .... Construction Contract Amendment .... Amending the Telephone System Construction Contract (Labor and Material), RUS Form 515 .... RUS.\1\ 545 .... 9 - 66 .... Central Office Equipment Contract (Not Including Installation) .... Purchase and deliver central office equipment .... RUS.\1\ 756 .... 3 - 63 .... Telephone Line Extension Construction Contract (Labor and Materials) .... Construction of system improvements and line extensions where scope of the project is not known .... RUS.\1\ 773 .... 12 - 90 .... Miscellaneous Construction Work and Maintenance Service Contract. .... Minor construction by contract and maintenance and repair of telephone system facilities. .... RUS.\1\ 787 .... 8 - 63 .... Supplement A to Construction Contract RUS Form 515 .... Used in RUS Form 515 when borrower furnishes any material for construction of the project .... RUS.\1\ No form number .... 5 - 94 .... Addendum No. 2 to RUS Forms 525 and 545 Central Office Equipment Contracts .... Incorporates the Software License Agreement into RUS Forms 525 and 545 .... RUS.\1\ Footnote: \1\A limited number of copies of the publication will be furnished by RUS upon request. As this document is produced by the Federal Government and is, therefore, in the public domain, additional copies may be duplicated locally by any user as desired. Requests for copies should be sent the Director, Administrative Services Division, U.S. Department of Agriculture, Rural Utilities Service, Washington, DC 20250. The telephone number of the RUS Publication Office is (202) 720 - 8674. Footnote: \2\This contract form is for sale by the Superintendent of Documents, Government Printing Office, Washington, DC 20402. RUS Form 33, Order Blank for RUS Contract Forms from the Government Printing Office should be used to order the publication. Follow the procedure under (\1\) to obtain copies of Form 33 from RUS. (TABLE END) [53 FR 15546, May 2, 1988; as amended at 55 FR 2510, Jan. 25, 1990. Redesignated at 55 FR 39397, Sept. 27, 1990, as amended at 56 FR 1484, Jan. 15, 1991; 59 FR 17681, Apr. 14, 1994; 59 FR 31126, June 17, 1994; 59 FR 66440, Dec. 27, 1994] __1755.94 -- 1755.96 [Reserved] _1755.97 Incorporation by reference of telephone standards and specifications. The following telephone Bulletins have been approved for incorporation by reference by the Director of the Office of the Federal Register on December 30, 1983. Bulletin 345 - 150 (Form 515a) containing the specifications and drawings for construction of buried cables and wires may be purchased from the Superintendent of Documents, U.S. Government Printing Office, Washington, DC 20402. The remaining Bulletins containing construction standards and specifications for materials and equipment may be obtained from the Rural Utilities Service, Administrative Services Division, Room 0175 - S, Washington, DC 20250. The bulletins are available for inspection at the Office of the Federal Register, 800 North Capitol Street, NW., suite 700, Washington, DC. These materials are incorporated as they exist on the date of the approval and a notice of any change in these materials will be published in the Federal Register. The terms ``RUS form'', ``RUS standard form'', ``RUS specification'', and ``RUS bulletin'' have the same meanings as the terms ``REA form'', ``REA standard form'', ``REA specification'', and ``REA (TABLE START)bulletin'', respectively, unless otherwise indicated. @h1RUS Bulletin No. @h1Specification No. @h1Date last issued @h1Title of standard or specification 345 - 22 .... PE - 26 .... Jan. 1989 .... RUS specification for voice frequency loading coils. 345 - 39 .... .... Aug. 19, 1985 .... RUS specification for telephone station protectors. 345 - 50 .... PE - 60 .... Sept. 1979 .... RUS specification for trunk carrier systems. 345 - 52 .... PC - 5A .... Jan. 1980 .... RUS standard for service entrance and station protector installations. 345 - 54 .... PE - 52 .... Dec. 1971 .... RUS specification for telephone cable splicing connectors. 345 - 55 .... PE - 61 .... Dec. 1973 .... RUS specification for central office loop extenders and loop extender voice frequency repeater combinations. 345 - 63 .... PC - 4 .... May 1976 .... RUS standard for acceptance tests and measurements of telephone plant. 345 - 65 .... PE - 65 .... Mar. 22, 1985 .... Specification for shield bonding connectors. 345 - 66 .... PE - 64 .... Sept. 1979 .... RUS specification for subscriber carrier systems. 345 - 69 .... PE - 29 .... Jan. 1978 .... RUS specification for two-wire voice frequency repeater equipment. 345 - 72 .... PE - 74 .... Oct. 1985 .... RUS specification for filled splice closures. 345 - 78 .... PE - 78 .... Feb. 1980 .... RUS specification for carbon arrester assemblies for use in protectors. 345 - 150 .... Form 515a .... July 1989 .... RUS specifications and drawings for construction of direct buried plant. 345 - 151 .... Form 515c .... July 1989 .... RUS specifications and drawings for conduit and manhole construction. 345 - 152 .... Form 515d .... July 1989 .... RUS specifications and drawings for underground cable installation. 345 - 153 .... Form 515f .... July 1989 .... RUS specifications and drawings for construction of pole line and aerial cables. 345 - 154 .... Form 515g .... July 1989 .... RUS specifications and drawings for service entrance and station protection installation. 345 - 180 .... Form 397a .... Jan. 1963 .... RUS specifications for voice frequency repeaters and voice frequency repeatered trunks. 345 - 183 .... Form 397d .... June 1970 .... RUS design specifications for point-to-point microwave radio systems. 345 - 184 .... Form 397e .... May 1971 .... RUS design specifications for mobile and fixed dial radio telephone equipment. 1728F - 700 .... .... 9-2-93 .... RUS Specification for Wood Poles, Stubs and Anchor Logs (TABLE END) [48 FR 57470, Dec. 30, 1983] Editorial Note: For Federal Register citations affecting _1755.97, see the List of CFR Sections Affected in the Finding Aids section of this volume. _1755.98 List of telephone standards and specifications included in other 7 CFR parts. The following standards and specifications are included throughout 7 CFR chapter XVII. These standards and specifications are not incorporated by reference elsewhere in the chapter. The terms ``RUS form'', ``RUS standard form'', ``RUS specification'', and ``RUS bulletin'' have the same meanings as the terms ``REA form'', ``REA standard form'', ``REA specification'', and (TABLE START)``REA bulletin'', respectively, unless otherwise indicated. @h1Section @h1Issue date @h1Title 1728.202 .... 9 - 2 - 93 .... RUS Specification for Quality Control and Inspection of Timber Products. 1755.200 .... 1 - 26 - 95 .... RUS Standard for Splicing Copper and Fiber Optic Cables. 1755.370 .... 1 - 19 - 90 .... RUS Specification for Seven Wire Galvanized Steel Strand. 1755.390 .... 6 - 21 - 93 .... RUS Specification for Filled Telephone Cables. 1755.397 .... 3 - 6 - 90 .... RUS Design Specification for Digital Lightwave Transmission Systems, RUS Form 397h. 1755.522 .... 6 - 28 - 93 .... RUS General Specification for Digital, Stored Program Controlled Central Office Equipment. 1755.525 .... 7 - 18 - 94 .... RUS Form 525, Central Office Equipment Contract (Including Installation). 1755.860 .... 12 - 20 - 93 .... RUS Specification for Filled Buried Wires. 1755.870 .... 7 - 14 - 94 .... RUS Specification for Terminating Cables. 1755.890 .... 6 - 21 - 93 .... RUS Specification for Filled Telephone Cables with Expanded Insulation. 1755.900 .... 8 - 4 - 94 .... RUS Specification for Filled Fiber Optic Cables. 1755.910 .... 11 - 21 - 94 .... RUS Specification for Outside Plant Housings and Serving Area Interface Systems. (TABLE END) [58 FR 41410, Aug. 3, 1993, as amended at 59 FR 53044, Oct. 21, 1994; 59 FR 66440, Dec. 27, 1994; 60 FR 1712, Jan. 5, 1995; 60 FR 5097, Jan. 26, 1995] __1755.99 -- 1755.199 [Reserved] _1755.200 RUS standard for splicing copper and fiber optic cables. (a) Scope. (1) This section describes approved methods for splicing plastic insulated copper and fiber optic cables. Typical applications of these methods include aerial, buried, and underground splices. (2) American National Standard Institute/National Fire Protection Association (ANSI/NFPA) 70, 1993 National Electrical Code (NEC) referenced in this section is incorporated by reference by RUS. This incorporation by reference was approved by the Director of the Federal Register in accordance with 5 U.S.C. 552(a) and 1 CFR part 51. A copy of the ANSI/NFPA 1993 NEC standard is available for inspection during normal business hours at RUS, room 2845, U.S. Department of Agriculture, Washington, DC 20250 - 1500 or at the Office of the Federal Register, 800 North Capitol Street, NW., suite 700, Washington, DC. Copies are available from NFPA, Batterymarch Park, Quincy, Massachusetts 02269, telephone number 1 (800) 344 - 3555. (3) American National Standard Institute/Institute of Electrical and Electronics Engineers, Inc. (ANSI/IEEE), 1993 National Electrical Safety Code (NESC) referenced in this section is incorporated by reference by RUS. This incorporation by reference was approved by the Director of the Federal Register in accordance with 5 U.S.C. 552(a) and 1 CFR part 51. A copy of the ANSI/IEEE 1993 NESC standard is available for inspection during normal business hours at RUS, room 2845, U.S. Department of Agriculture, Washington, DC 20250 - 1500 or at the Office of the Federal Register, 800 North Capitol Street, NW., suite 700, Washington, DC. Copies are available from IEEE Service Center, 455 Hoes Lane, Piscataway, New Jersey 08854, telephone number 1 (800) 678 - 4333. (b) General. (1) Only Rural Utilities Service (RUS) accepted filled cable and splicing materials shall be used on outside plant projects financed by RUS. (2) The installation instructions provided by the manufacturer of splicing materials shall be followed except where those instructions conflict with the procedures specified in this section. (3) Precautions shall be taken to prevent the ingress of moisture and other contaminants during all phases of the splicing installation. When an uncompleted splice must be left unattended, it shall be sealed to prevent the ingress of moisture and other contaminants. (4) Minor sheath damage during construction may be repaired if the repair is completed immediately and approved by the borrower's resident project representative. Minor damage is typically repaired by: (i) Scuffing the cable sheath associated with the damaged area; (ii) Applying several layers of DR tape over the scuffed and damaged area; (iii) Applying several layers of plastic tape over the DR tape; and (iv) If damage is severe enough to rupture the cable shield, a splice closure shall be installed. (5) All splice cases installed on RUS toll trunk and feeder cables shall be filled, whether aerial, buried, or underground. (c) Splicing considerations for copper cables -- (1) Preconstruction testing. It is desirable that each reel of cable be tested for grounds, opens, shorts, crosses, and shield continuity before the cable is installed. However, manufacturer supplied test results are acceptable. All cable pairs shall be free from electrical defects. (2) Handling precautions. The cable manufacturer's instructions concerning pulling tension and bending radius shall be observed. Unless the cable manufacturer's recommendation is more stringent, the minimum bending radius shall be 10 times the cable diameter for copper cables and 20 times the cable diameter for fiber optic cables. (3) Cable sheath removal. (i) The length of cable sheath to be removed shall be governed by the type of splicing hardware used. Follow the splice case manufacturer's recommendations. For pedestals or large pair count splice housings, consider removing enough cable sheath to allow the conductors to extend to the top of the pedestal and then to hang downward to approximately 15 centimeters (cm) (6 inches (in.)) above the baseplate. (ii) Caution shall be exercised to avoid damaging the conductor insulation when cutting through the cable shield and removing the shield. Sharp edges and burrs shall be removed from the cut end of the shield. (4) Shield bonding and grounding. For personnel safety, the shields of the cables to be spliced shall be bonded together and grounded before splicing activities are started. (See paragraphs (g)(2), and (g)(5)(i) through (g)(5)(iii) of this section for final bonding and grounding provisions.) (5) Binder group identification. (i) Color coded plastic tie wraps shall be placed loosely around each binder group of cables before splicing operations are attempted. The tie wraps shall be installed as near the cable sheath as practicable and shall conform to the same color designations as the binder ribbons. Twisted wire pigtails shall not be used to identify binder groups due to potential transmission degradation. (ii) The standard insulation color code used to identify individual cable pairs within 25-pair binder groups shall be as shown in Table (TABLE START)1: Table 1. -- Cable Pair Identification Within Binder Groups @h1Pair No. @h1Color@h2Tip@h2Ring 1 .... White .... Blue. 2 .... White .... Orange. 3 .... White .... Green. 4 .... White .... Brown. 5 .... White .... Slate. 6 .... Red .... Blue. 7 .... Red .... Orange. 8 .... Red .... Green. 9 .... Red .... Brown. 10 .... Red .... Slate. 11 .... Black .... Blue. 12 .... Black .... Orange. 13 .... Black .... Green. 14 .... Black .... Brown. 15 .... Black .... Slate. 16 .... Yellow .... Blue. 17 .... Yellow .... Orange. 18 .... Yellow .... Green. 19 .... Yellow .... Brown. 20 .... Yellow .... Slate. 21 .... Violet .... Blue. 22 .... Violet .... Orange. 23 .... Violet .... Green. 24 .... Violet .... Brown. 25 .... Violet .... Slate. (TABLE END) (iii) The standard binder ribbon color code used to designate 25- (TABLE START)pair binder groups within 600-pair super units shall be as shown in Table 2: Table 2. -- Cable Binder Group Identification @h1Group No. @h1Color of bindings @h1Group pair count 1 .... White-Blue .... 1 - 25 2 .... White-Orange .... 26 - 50 3 .... White-Green .... 51 - 75 4 .... White-Brown .... 76 - 100 5 .... White-Slate .... 101 - 125 6 .... Red-Blue .... 126 - 150 7 .... Red-Orange .... 151 - 175 8 .... Red-Green .... 176 - 200 9 .... Red-Brown .... 201 - 225 10 .... Red-Slate .... 226 - 250 11 .... Black-Blue .... 251 - 275 12 .... Black-Orange .... 276 - 300 13 .... Black-Green .... 301 - 325 14 .... Black-Brown .... 326 - 350 15 .... Black-Slate .... 351 - 375 16 .... Yellow-Blue .... 376 - 400 17 .... Yellow-Orange .... 401 - 425 18 .... Yellow-Green .... 426 - 450 19 .... Yellow-Brown .... 451 - 475 20 .... Yellow-Slate .... 476 - 500 21 .... Violet-Blue .... 501 - 525 22 .... Violet-Orange .... 526 - 550 23 .... Violet-Green .... 551 - 575 24 .... Violet-Brown .... 576 - 600 (TABLE END) (iv) Super-unit binder groups shall be identified in accordance (TABLE START)with Table 3: Table 3. -- Super-Unit Binder Colors @h1Pair numbers @h1Binder color 1 - 600 .... White. 601 - 1200 .... Red. 1201 - 1800 .... Black. 1801 - 2400 .... Yellow. 2401 - 3000 .... Violet. 3001 - 3600 .... Blue. 3601 - 4200 .... Orange. 4201 - 4800 .... Green. 4801 - 5400 .... Brown. 5401 - 6000 .... Slate. (TABLE END) (v) Service pairs in screened cables shall be identified in (TABLE START)accordance with Table 4: Table 4. -- Screened Cable Service Pair Identification @h1Service pair No. @h1Color @h2Tip@h2Ring 1 .... White .... Red. 2 .... White .... Black. 3 .... White .... Yellow. 4 .... White .... Violet. .... Red .... Black. 6 .... Red .... Yellow. 7 .... Red .... Violet. 8 .... Black .... Yellow. 9 .... Black .... Violet. (TABLE END) (6) Cleaning conductors. It is not necessary to remove the filling compound from cable conductors before splicing. However, it is permissible to wipe individual conductors with clean paper towels or clean cloth rags. No cleaning chemicals, etc., shall be used. Caution shall be exercised to maintain individual cable pair and binder group identity. Binder group identity shall be maintained by using color coded plastic tie wraps. Individual pair identification shall be maintained by carefully twisting together the two conductors of each pair. (7) Expanded plastic insulated conductor (PIC) precautions. Solid PIC and expanded (foam or foam skin) PIC are spliced in the same manner, using the same tools and materials and, in general, should be treated the same. However, the insulation on expanded PIC is much more fragile than solid PIC. Twisting or forming expanded PIC into extremely compact splice bundles and applying excessive amounts of tension when tightening tie wraps causes shiners and, thus shall be avoided. (8) Splice connectors. (i) Only RUS accepted filled splice connectors shall be used on outside plant projects financed by RUS. (ii) Specialized connectors are available for splicing operations such as butt splices, in line splices, bridge taps, clearing and capping, and multiple pair splicing operations. The splice connector manufacturer's recommendations shall be followed concerning connector selection and use. (iii) Caution shall be exercised to maintain conductor and pair association both during and after splicing operations. (iv) Splicing operations that involve pairs containing working services shall utilize splice connectors that permit splicing without the interruption of service. (9) Piecing out conductors. Conductors may be pieced-out to provide additional slack or to repair damaged conductors. However, the conductors shall be pieced-out with conductors having the same gauge and type and color of insulation. The conductors used for piecing-out shall be from cables having RUS acceptance. (10) Splice organization. Spliced pair bundles shall be arranged in firm lay-ups with minimum conductor tension in accordance with the manufacturer's instructions. (11) Binder tape. Perforated nonhygroscopic and nonwicking binder tape should be applied to splices housed in filled splice cases. The binder tape allows the flow of filling compound while holding the splice bundles near the center of the splice case to allow adequate coverage of filling compound. (12) Cable tags. Cables shall be identified by a tag indicating the cable manufacturer's name, cable size, date of placement, and generic route information. Information susceptible to changes caused by future cable throws and rearrangements should not be included. Tags on load coil stubs shall include the serial number of the coil case, the manufacturer's name, and the inductance value. (13) Screened cable. Screened PIC cable is spliced in the same manner as nonscreened PIC cable. However, special considerations are necessary due to differences in the cable design. The transmit and receive bundles of the cable shall be separated and one of the bundles shall be wrapped with shielding material in accordance with the cable manufacturer's recommendations. When acceptable to the cable manufacturer, it is permissible to use either the scrap screening tape removed from the cable during the sheath opening process provided the screening tape is edge coated or new pressure sensitive aluminum foil tape over polyethylene tape. (14) Service wire connections. (i) Buried service wires may be spliced directly to cable conductors inside pedestals using the same techniques required for branch cables. Buried service wires may also be terminated on terminal blocks inside pedestals in areas where high service order activity or fixed count cable administration policies require terminal blocks. However, only RUS accepted terminal blocks equipped with grease or gel filled terminations to provide moisture and corrosion resistance shall be used. (ii) Only filled terminal blocks having RUS acceptance shall be used on aerial service wire connections. (15) Copper cable testing. Copper cable testing shall be performed in accordance with RUS Bulletin 345 - 63, ``RUS Standard for Acceptance Tests and Measurements of Telephone Plant,'' PC - 4, (Incorporated by reference at _1755.97). (16) Cable acceptance. Installed cable shall be tested and pass the inventory and acceptance testing specified in the Telephone System Construction Contract (Labor and Materials), RUS Form 515. The tests and inspections shall be witnessed by the borrower's resident project representative. All conductors shall be free from grounds, shorts, crosses, splits, and opens. (d) Splice arrangements for copper cables -- (1) Service distribution closures. (i) Ready access closures permit cable splicing activities and the installation of filled terminal blocks for service wire connections in the same closure. Ready access designs shall allow service technicians direct access to the cable core as well as the terminal block. (ii) Fixed count terminals shall restrict service technician access to the cable core. Predetermined cable pairs shall be spliced to the terminal leads or stub cable in advance of service assignments. (2) Aerial splices. Aerial splice cases accommodate straight splices, branch splices, load coils, and service distribution terminals. Aerial splicing arrangements having more than 4 cables spliced in the same splice case are not recommended. Stub cabling to a second splice case to avoid a congested splice is acceptable. (3) Buried splices. (i) Direct buried splice cases accommodate straight splices, branch splices, and load coils. Direct buried splices shall be filled and shall be used only when above ground splicing in pedestals is not practicable. (ii) A treated plank or equivalent shall be placed 15 cm (6 in.) above the buried splice case to prevent damage to the splice case from future digging. Where a firm base for burying a splice cannot be obtained, a treated plank or equivalent shall be placed beneath the splice case. (iii) Each buried splice shall be identified for future locating. One method of marking the splice point is the use of a warning sign. Another method is the burying of an electronic locating device. (4) BD-type pedestals. (i) BD-type pedestals are housings primarily intended to house, organize, and protect cable terminations incorporating splice connectors, ground lugs, and load coils. Activities typically performed in pedestals are cable splicing, shield bonding and grounding, loading, and connection of subscriber service drops. (ii) The recommended splice capacities for BD-type pedestals are shown in Table 5. However, larger size pedestals are permissible if service (TABLE START)requirements dictate their usefulness. Table 5 is as follows: Table 5. -- Splice Capacities for BD-Type Pedestals @h1Pedestal type @h1Maximum straight splice pair capacity using single pair connectors or multiple pair splice modules @h1Maximum load splice pair capacity using single pair connectors or multiple pair splice modules (see note 1) BD3, BD3A .... 100 Pair .... 50 Pair. BD4, BD4A .... 200 Pair .... 100 Pair. BD5, BD5A .... 600 Pair .... 300 Pair. BD7 .... 1200 Pair .... 600 Pair. BD14, BD14A .... 100 Pair .... 50 Pair. BD15, BD15A .... 400 Pair .... 200 Pair. BD16, BD16A .... 600 Pair .... 300 Pair. Footnote: Note 1: This table refers to load coil cases that are to be direct buried with stub cables extending into the pedestal for splicing. Requirements involving individual coil arrangements inside the pedestal should be engineered on a case-by-case basis. (TABLE END) (iii) Special distribution pedestals having a divider plate for mounting filled terminal blocks are available. Distribution pedestals are also equipped with service wire channels for installation of buried service wires without disturbing the cabling and gravel inside the base of the pedestal. Distribution pedestals are recommended in locations where the connection of service wires is required. (5) Large pair count splice housings. Large pair count splice housings are recommended for areas not suitable for man- holes. The (TABLE START)recommended capacities are shown in Table 6: Table 6. -- Splice Capacities for Large Count Housings @h1Housing type @h1Maximum straight splice pair capacity using single pair connectors or multiple pair splice modules @h1Maximum load splice pair capacity using single pair connectors or multiple pair splice modules (see note 1) BD 6000 .... 6,000 Pair .... 3,000 Pair. BD 8000 .... 8,000 Pair .... 4,000 Pair. BD 10000 .... 10,000 Pair .... 5,000 Pair. (TABLE END) (6) Pedestal restricted access inserts. Restricted access inserts may be used to protect splices susceptible to unnecessary handling where subsequent work activities are required or expected to occur after splices have been completed. Restricted access inserts also provide moisture protection in areas susceptible to temporary flooding. A typical restricted access insert is shown in Figure 1: E:\GRAPHICS\ER26JA95.002 (7) Serving Area Interface (SAI) Systems. SAI systems provide the cross-connect point between feeder and distribution cables. Connection of feeder to distribution pairs is accomplished by placing jumpers between connecting blocks. Only RUS accepted connecting blocks having grease or gel filled terminations to provide moisture and corrosion resistance shall be used. (8) Buried cable splicing arrangements. Typical buried cable splicing arrangements are illustrated in Figures 2 through 5: E:\GRAPHICS\ER26JA95.003 E:\GRAPHICS\ER26JA95.004 E:\GRAPHICS\ER26JA95.005 E:\GRAPHICS\ER26JA95.006 (9) Underground splices (manholes). Underground splice cases accommodate straight splices, branch splices, and load coils. Underground splices shall be filled. (10) Central office tip cable splices. (i) Filled cable or filled splices are not recommended for use inside central offices, except in cable vault locations. Outside plant cable sheath and cable filling compound are susceptible to fire and will support combustion. Fire, smoke, and gases generated by these materials during burning are detrimental to telephone switching equipment. (ii) Tip cables should be spliced in a cable vault. However, as a last resort, tip cables may be spliced inside a central office if flame retardant splice cases or a noncombustible central office splice housing is used to contain the splice. (iii) Splices inside the central office shall be made as close as practical to the point where the outside plant cables enter the building. Except in cable vault locations, outside plant cables within the central office shall be wrapped with fireproof tape or enclosed in noncombustible conduit. (e) Splicing considerations for fiber optic cables -- (1) Connection characteristics. Splicing efficiency between optical fibers is a function of light loss across the fiber junctions measured in decibels (dB). A loss of 0.2 dB in a splice corresponds to a light transmission efficiency of approximately 95.5 percent. (2) Fiber core alignment. Fiber splicing techniques shall be conducted in such a manner that the cores of the fibers will be aligned as perfectly as possible to allow maximum light transmission from one fiber to the next. Without proper alignment, light will leave the fiber core and travel through the fiber cladding. Light outside the fiber core is not a usable light signal. Core misalignment is illustrated in Figure 6: E:\GRAPHICS\ER26JA95.007 (3) Splice loss. (i) Splice loss can also be caused by fiber defects such as nonidentical core diameters, cores not in center of the fiber, and noncircular cores. Such defects are depicted in Figure 7: E:\GRAPHICS\ER26JA95.008 (ii) Undesirable splice losses are caused by poor splicing techniques including splicing irregularities such as improper cleaves and dirty splices. Typical cleave problems are illustrated in Figure 8: E:\GRAPHICS\ER26JA95.009 (4) Handling precautions. The following precautions shall be observed: (i) Avoid damaging the cable during handling operations prior to splicing. Minor damage may change the transmission characteristics of the fibers to the extent that the cable section will have to be replaced; (ii) The cable manufacturer's recommendations concerning pulling tension shall be observed. The maximum pulling tension for most fiber optic cable is 2669 newtons (600 pound-force); (iii) The cable manufacturer's recommendations concerning bending radius shall be observed. Unless the cable manufacturer's recommendation is more stringent, the minimum bending radius for fiber optic cable shall be 20 times the cable diameter; (iv) The cable manufacturer's recommendations concerning buffer tube bending radius shall be observed. Unless the cable manufacturer's recommendation is more stringent, the minimum bending radius for buffer tubes is usually between 38 millimeters (mm) (1.5 in.) and 76 mm (3.0 in.). The bending limitations on buffer tubes are intended to prevent kinking. Buffer tube kinking may cause excessive optical loss or fiber breakage; and (v) Handle unprotected glass fibers carefully to avoid introducing flaws such as scratched or broken fibers. (5) Personnel safety. The following safety precautions shall be observed: (i) Safety glasses shall be worn when handling glass fibers; (ii) Never view open-ended fibers with the naked eye or a magnifying device. Improper viewing of a fiber end that is transmitting light may cause irreparable eye damage; and (iii) Dispose of bare scrap fibers by using the sticky side of a piece of tape to pick up and discard loose fiber ends. Fiber scraps easily penetrate the skin and are difficult to remove. (6) Equipment requirements. (i) Fiber optic splices shall be made in areas where temperature, humidity, and cleanliness can be controlled. Both fusion and mechanical splicing techniques may require a splicing vehicle equipped with a work station that will allow environmental control. (ii) Both fusion and mechanical splicing techniques are permitted on RUS financed projects. When using the mechanical splicing technique, only RUS accepted mechanical fiber optic splice connectors can be used. (iii) Fusion splicing machines shall be kept in proper working condition. Regular maintenance in accordance with the machine manufacturer's recommendations shall be observed. (iv) Mechanical splicing tools shall be in conformance with the tool manufacturer's recommendations. (v) An optical time domain reflectometer (OTDR) shall be used for testing splices. The OTDR shall be stationed at the central office or launch point for testing individual splices as they are made and for end-to-end signature tests for the fiber optic link. (vi) An optical power meter shall be used for end-to-end cable acceptance tests. (vii) A prerequisite for the successful completion of a fiber optic splicing endeavor is the presence of a talk circuit between the splicing technician in the splicing vehicle and the operator of the OTDR in the central office. The splicing technician and the OTDR operator shall have access to communications with each other in order to inform each other as to: (A) Which splices meet the loss objectives; (B) The sequence in which buffer tubes and fibers are to be selected for subsequent splicing operations; and (C) The timing required for the performance of OTDR testing to prevent making an OTDR test at the same time a splice is being fused. (7) Cable preparation. (i) Engineering work prints shall prescribe the cable slack needed at splice points to reach the work station inside the splicing vehicle. Consideration should be given to the slack required for future maintenance activity as well as initial construction activities. The required slack may be different for each splice point, depending on the site logistics. However, the required slack is seldom less than 15 meters (50 feet). The amount of slack actually used shall be recorded for each splice point to assist future maintenance and restoration efforts. (ii) The splice case manufacturer's recommendations concerning the amount of cable sheath to be removed shall be followed to facilitate splicing operations. The length of the sheath opening shall be identified with a wrap of plastic tape. (iii) If the cable contains a rip cord, the cable jacket shall be ring cut approximately 15 cm (6 in.) from the end and the 15 cm (6 in.) of cable jacket shall be removed to expose the rip cord. The rip cord shall be used to slit the jacket to the tape mark. (iv) If the cable does not contain a rip cord, the cable jacket shall be slit using a sheath splitter. No cuts shall be made into the cable core nor shall the buffer tubes be damaged. (v) If the cable contains an armor sheath, the outer jacket shall be opened along the slit and the jacket shall be removed exposing the armor sheath. The armor shall be separated at the seam and pulled from the cable exposing the inner jacket. The armor shall be removed making allowances for a shield bond connector. The inner sheath shall be slit using a sheath splitter or rip cord. The cable core shall not be damaged nor shall there be any damage to the buffer tubes. The jacket shall be peeled back and cut at the end of the slit. The exposed buffer tubes shall not be cut, kinked, or bent. (vi) After the cable sheath has been removed, the binder tape shall be removed from the cable. The cable shall not be crushed or deformed. (vii) The buffer tubes shall be unstranded one at a time. The buffer tubes shall not be kinked. (viii) If the cable is equipped with a strength member, the strength member shall be cut to the length recommended by the splice case manufacturer. (ix) Each buffer tube shall be inspected for kinks, cuts, and flat spots. If damage is detected, an additional length of cable jacket shall be removed and all of the buffer tubes shall be cut off at the point of damage. (x) The cable preparation sequence shall be repeated for the other cable end. (8) Shield bonding and grounding. For personnel safety, the shields and metallic strength members of the cables to be spliced shall be bonded together and grounded before splicing activities are started. (See paragraphs (g)(4), and (g)(5)(i) through (g)(5)(iii) of this section for final bonding and grounding provisions). (9) Fiber optic color code. The standard fiber optic color (TABLE START)code for buffer tubes and individual fibers shall be as shown in Table 7: Table 7. -- Fiber and Buffer Tube Identification @h1Buffer tube and fiber No. @h1Color 1 .... Blue. 2 .... Orange. 3 .... Green. 4 .... Brown. 5 .... Slate. 6 .... White. 7 .... Red. 8 .... Black. 9 .... Yellow. 10 .... Violet. 11 .... Rose. 12 .... Aqua. 13 .... Blue/Black Tracer. 14 .... Orange/Black Tracer. 15 .... Green/Black Tracer. 16 .... Brown/Black Tracer. 17 .... Slate/Black Tracer. 18 .... White/Black Tracer. 19 .... Red/Black Tracer. 20 .... Black/Yellow Tracer. 21 .... Yellow/Black Tracer. 22 .... Violet/Black Tracer. 23 .... Rose/Black Tracer. 24 .... Aqua/Black Tracer. (TABLE END) (10) Buffer tube removal. (i) The splice case manufacturer's recommendation shall be followed concerning the total length of buffer tube to be removed. Identify the length to be removed with plastic tape. (ii) Experiment with a scrap buffer tube to determine the cutting tool adjustment required to ring cut a buffer tube without damaging the fibers. (iii) Buffer tubes shall be removed by carefully ring cutting and removing approximately 15 to 46 cm (6 to 18 in.) of buffer tube at a time. The process shall be repeated until the required length of buffer tube has been removed, including the tape identification marker. (11) Coated fiber cleaning. (i) Each coated fiber shall be cleaned. The cable manufacturer's recommendations shall be followed concerning the solvent required to clean the coated fibers. Reagent grade isopropyl alcohol is a commonly used cleaning solvent. (ii) A tissue or cotton ball shall be soaked in the recommended cleaning solvent and the coated fibers shall be carefully wiped one at a time using a clean tissue or cotton ball for each coated fiber. Caution shall be exercised to avoid removing the coloring agent from the fiber coating. (12) Fiber coating removal. (i) Fiber coatings shall be removed. In accordance with the splicing method used, the splice case manufacturer's recommendation shall be followed concerning the length of fiber coating to be removed. (ii) The recommended length of fiber coating shall be removed only on the two fibers to be spliced. Fiber coating removal shall be performed on a one-fiber-at-a-time basis as each splice is prepared. (13) Bare fiber cleaning. After the fiber coating has been removed, the bare fibers shall be cleaned prior to splicing. Each fiber shall be wiped with a clean tissue or cotton ball soaked with the cleaning solvent recommended by the cable manufacturer. The bare fiber shall be wiped one time to minimize fiber damage. Aggressive wiping of bare fiber shall be avoided as it lowers the fiber tensile strength. (14) Fiber cleaving. Cleaving tools shall be clean and have sharp cutting edges to minimize fiber scratches and improper cleave angles. Cleaving tools that are recommended by the manufacturer of the splicing system shall be used. (15) Cleaved fiber handling. The cleaved and cleaned fiber shall not be allowed to touch other objects and shall be inserted into the splicing device. (16) Completion of the splice. (i) In accordance with the method of splicing selected by the borrower, the splice shall be completed by either fusing the splice or by applying the mechanical connector. (ii) Each spliced fiber shall be routed through the organizer tray one at a time as splices are completed. The fibers shall be organized one at a time to prevent tangled spliced fibers. The splice case manufacturer's recommendation shall be followed concerning the splice tray selection. (17) Fiber optic testing. Fiber optic testing shall be performed in accordance with RUS Bulletin 345 - 63, ``RUS Standard for Acceptance Tests and Measurements of Telephone Plant,'' PC - 4, (Incorporated by reference at _1755.97). (18) Cable acceptance. Installed cable shall be tested and pass the inventory and acceptance testing specified in the Telephone System Construction Contract (Labor and Materials), RUS Form 515. The tests and inspections shall be witnessed by the borrower's resident project representative. (f) Splice arrangements for fiber optic cables -- (1) Aerial splices. Cable slack at aerial splices shall be stored either on the messenger strand, on the pole, or inside a pedestal at the base of the pole. A typical arrangement for the storage of slack cable at aerial splices is shown in Figure 9: E:\GRAPHICS\ER26JA95.010 (2) Buried splices. Buried splices shall be installed in handholes to accommodate the splice case and the required splicing slack. An alternative to the handhole is a pedestal specifically designed for fiber optic splice cases. Typical arrangements for buried cable splices are shown in Figures 10 and 11: E:\GRAPHICS\ER26JA95.011 E:\GRAPHICS\ER26JA95.012 (3) Underground manhole splices. Underground splices shall be stored in manholes on cable hooks and racks fastened to the manhole wall. The cable slack shall be stored on cable hooks and racks as shown in Figure 12: E:\GRAPHICS\ER26JA95.013 (4) Central office cable entrance. (i) Filled cable or filled splices are not recommended for use inside central offices except in cable vault locations. Outside plant cable sheath and cable filling compound are susceptible to fire and will support combustion. Fire, smoke, and gases generated by these materials during burning are detrimental to telephone switching equipment. (ii) As a first choice, the outside plant fiber optic cable shall be spliced to an all-dielectric fire retardant cable in a cable vault with the all-dielectric cable extending into the central office and terminating inside a fiber patch panel. (iii) As a second choice, the outside plant cable may be spliced inside the central office if a flame retardant fiber optic splice case or a noncombustible central office splice housing equipped with organizer trays is used to contain the splice. (iv) In cases referenced in paragraphs (f)(4)(ii) and (f)(4)(iii) of this section, as a minimum the fire retardant all-dielectric cable used to provide the connection between the cable entrance splice and the fiber patch panel shall be listed as Communication Riser Cable (Type CMR) in accordance with Sections 800 - 50 and 800 - 51(b) of the 1993 National Electrical Code. (v) Splices inside the central office shall be made as close as practicable to the point where the outside plant cables enter the building. Except in cable vault locations, outside plant cables within the central office shall be wrapped with fireproof tape or enclosed in noncombustible conduit. (g) Bonding and grounding fiber optic cable, copper cable, and copper service wire -- (1) Bonding. Bonding is electrically connecting two or more metallic items of telephone hardware to maintain a common electrical potential. Bonding may involve connections to another utility. (2) Copper cable shield bond connections. (i) Cable shields shall be bonded at each splice location. Only RUS accepted cable shield bond connectors shall be used to provide bonding and grounding connections to metallic cable shields. The shield bond connector manufacturer's instructions shall be followed concerning installation and use. (ii)(A) Shield bonding conductors shall be either stranded or braided tinned copper wire equivalent to a minimum No. 6 American Wire Gauge (AWG) and shall be RUS accepted. The conductor connections shall be tinned or of a compatible bimetallic design to avoid corrosion problems associated with dissimilar metals. The number of shield bond connectors required per pair size (TABLE START)and gauge shall be as shown in Table 8: Table 8. -- Shield Bond Connectors per Pair Size and Gauge @h119 AWG @h1Pair size and gauge @h222 AWG @h224 AWG @h226 AWG @h1No. of shield bond connectors 0 - 25 .... 0 - 100 .... 0 - 150 .... 0 - 200 .... 1 50 - 100 .... 150 - 300 .... 200 - 400 .... 300 - 600 .... 2 150 - 200 .... 400 - 600 .... 600 - 900 .... 900 - 1500 .... 3 300 - 600 .... 900 - 1200 .... 1200 - 2100 .... 1800 - 3600 .... 4 (TABLE END) (B) It is permissible to strap across the shield bond connectors of several cables with a single length of braided wire. However, both ends of the braid shall be terminated on the pedestal ground bracket to provide a bonding loop. Shield bond connection methods for individual cables are shown in Figures 13 through 15, and the bonding of several cables inside a pedestal using the bonding loop is shown in Figure 16: E:\GRAPHICS\ER26JA95.014 E:\GRAPHICS\ER26JA95.015 E:\GRAPHICS\ER26JA95.016 E:\GRAPHICS\ER26JA95.017 (3) Buried service wire shield bond connections. Buried service wire shields shall be connected to the pedestal bonding and grounding system. Typical buried service wire installations are shown in Figures 17 and 18. In addition to the methods referenced in Figures 17 and 18, the shields of buried service wires may also be connected to the pedestal bonding and grounding system using buried service wire bonding harnesses listed on Page 3.3.1, Item ``gs-b,'' of RUS Bulletin 1755I - 100. RUS Bulletin 1755I - 100 may be purchased from the Superintendent of Documents, U.S. Government Printing Office, Washington, DC 20402. When those harnesses are used they shall be installed in accordance with the manufacturer's instructions. Figures 17 and 18 are as follows: E:\GRAPHICS\ER26JA95.018 E:\GRAPHICS\ER26JA95.019 (4) Fiber optic cable bond connections. (i) The cable shield and metallic strength members shall be bonded at each splice location. Only RUS accepted fiber optic cable shield bond connectors shall be used to provide bonding connections to the metallic cable shields. The shield bond connector manufacturer's instructions shall be followed concerning installation and use. (ii) Shield bonding conductors shall be either stranded or braided tinned copper wire equivalent to a minimum No. 6 American Wire Gauge (AWG) and shall be RUS accepted. The conductor connections shall be tinned or of a compatible bimetallic design to avoid corrosion problems associated with dissimilar metals. (5) Grounding. (i) Grounding is electrically connecting metallic telephone hardware to a National Electrical Safety Code (NESC) acceptable grounding electrode. Acceptable grounding electrodes are defined in the Rule 99A of the NESC. (ii) The conductor used for grounding metallic telephone hardware shall be a minimum No. 6 AWG solid, bare, copper conductor. (iii) For copper and fiber optic cable plant, all cable shields, all metallic strength members, and all metallic hardware shall be: (A) Grounded at each splice location to a driven grounding electrode (ground rod) of: (1) At least 1.5 meters (5 feet) in length where the local frost level is normally less than 0.30 meters (1 foot) deep; or (2) At least 2.44 meters (8 feet) in length where the local frost level is normally 0.30 meters (1 foot) or deeper; and (B) Bonded to a multi-grounded power system neutral when the splice is within 1.8 meters (6 feet) of access to the grounding system of the multi-grounded neutral system. Bonding to the multi-grounded neutral of a parallel power line may help to minimize telephone interference on long exposures with copper cable plant. Consideration, thus, should be given to completing such bonds, at least four (4) times each mile, when splices are greater than 1.8 meters (6 feet) but less than 4.6 meters (15 feet) from access to the multi-grounded neutral. (6) Bonding and grounding splice cases. (i) Splice cases are equipped with bonding and grounding devices to ensure that cable shields and metallic strength members maintain electrical continuity during and after cable splicing operations. The splice case manufacturer's recommendations shall be followed concerning the bonding and grounding procedures. Conductors used for bonding shall be either stranded or braided tinned copper wire equivalent to 6 AWG. Conductors used for grounding shall be a solid, bare, copper wire equivalent to minimum No. 6 AWG. (ii) Buried splice cases installed in either handholes or pedestals shall be grounded such that the cable shield grounds are attached to a common ground connection that will allow the lifting of a ground on the cable shield in either direction to permit efficient cable locating procedures. As a first choice, buried grounding conductor(s) shall be bare. However, if two or more grounding conductors are buried in the same trench, they shall be insulated to avoid shorts when a locating tone is applied. (iii) A typical bonding and grounding method for fiber optic splices is shown in Figure 19: E:\GRAPHICS\ER26JA95.020 (7) Bonding and grounding central office cable entrances. The RUS Telecommunications Engineering and Construction Manual (TE&CM) Section 810 provides bonding and grounding guidance for central office cable entrances. Splicing operations shall not be attempted before all metallic cable shield and strength members are bonded and grounded. [60 FR 5097, Jan. 26, 1995; 60 FR 9079, Feb. 16, 1995] __1755.201 -- 1755.369 [Reserved] _1755.370 RUS specification for seven wire galvanized steel strand. (a) RUS incorporates by reference ASTM A475 - 78, Standard Specification for Zinc-Coated Steel Wire Strand, issued May 1978. All seven wire galvanized steel strand purchased after April 1, 1990, for use on telecommunications systems financed by RUS loan funds must conform to this standard. This incorporation by reference was approved by the Director of the Federal Register in accordance with 5 U.S.C. 552(a) and 1 CFR part 51 on January 19, 1990). Copies of ASTM A475 - 78 are available for inspection during normal business hours at the Office of the Federal Register, 800 North Capitol Street, NW., suite 700, Washington, DC, and at the Rural Utilities Service, Administrative Services Division, room 0175 - S, U.S. Department of Agriculture, Washington, DC 20250, telephone 202 - 382 - 9551. Copies are available from the American Society for Testing and Materials, 1916 Race Street, Philadelphia, PA 19103, telephone 215 - 299 - 5400. (b) In addition to the requirements of ASTM 475 - 78, all coils and reels having Class B or C coatings shall be marked with a 3-inch wide and 6-inch long deep-colored stripe, green or orange, respectively, to identify the class of galvanized coating of the strand. This marking shall be applied to the exposed convolutions of the strand in the eye of the coils and located near the midpoint on the outside layer of strand on the reels. The marking shall not cover any welded joint markings. [55 FR 1792, Jan. 19, 1990; 55 FR 3685, Feb. 2, 1990. Redesignated at 55 FR 39397, Sept. 27, 1990] __1755.371 -- 1755.389 [Reserved] _1755.390 RUS specification for filled telephone cables. (a) Scope. (1) This section covers the requirements for filled telephone cables intended for direct burial installation either by trenching or by direct plowing, for underground application by placement in a duct, or for aerial installations by attachment to a support strand. (i) The conductors are solid copper, individually insulated with an extruded solid insulating compound. (ii) The insulated conductors are twisted into pairs which are then stranded or oscillated to form a cylindrical core. (iii) For high frequency applications, the cable core may be separated into compartments with screening shields. (iv) A moisture resistant filling compound is applied to the stranded conductors completely covering the insulated conductors and filling the interstices between pairs and units. (v) The cable structure is completed by the application of suitable core wrapping material, a flooding compound, a shield or a shield/armor, and an overall plastic jacket. (2) The number of pairs and gauge size of conductors which are (TABLE START)used within the RUS program are provided in the following table: @h1 @h1 @h1 @h1 @h1 AWG .... 19 .... 22 .... 24 .... 26 Pairs .... 6 .... 6 .... 6 .... .... 12 .... 12 .... 12 .... .... 18 .... 18 .... 18 .... .... 25 .... 25 .... 25 .... 25 .... .... 50 .... 50 .... 50 .... .... 75 .... 75 .... 75 .... .... 100 .... 100 .... 100 .... .... 150 .... 150 .... 150 .... .... 200 .... 200 .... 200 .... .... 300 .... 300 .... 300 .... .... 400 .... 400 .... 400 .... .... .... 600 .... 600 .... .... .... .... 900 Footnote: Note: Cables larger in pair sizes than those shown in this table must meet all requirements of this section. (TABLE END) (3) Screened cable, when specified, must meet all requirements of this section. The pair sizes of screened cables used within the RUS program are referenced in paragraph (e)(2)(i) of this section. (4) All cables sold to RUS borrowers for projects involving RUS loan funds under this section must be accepted by RUS Technical Standards Committee ``A'' (Telephone). For cables manufactured to the specification of this section, all design changes to an accepted design must be submitted for acceptance. RUS will be the sole authority on what constitutes a design change. (5) Materials, manufacturing techniques, or cable designs not specifically addressed by this section may be allowed if accepted by RUS. Justification for acceptance of modified materials, manufacturing techniques, or cable designs must be provided to substantiate product utility and long-term stability and endurance. (6) The American National Standard Institute/Insulated Cable Engineers Association, Inc. (ANSI/ICEA) S-84 - 608 - 1988 Standard For Telecommunications Cable, Filled, Polyolefin Insulated, Copper Conductor Technical Requirements referenced throughout this section is incorporated by reference by RUS. This incorporation by reference was approved by the Director of the Federal Register in accordance with 5 U.S.C. 552(a) and 1 CFR part 51. Copies of ANSI/ICEA S-84 - 608 - 1988 are available for inspection during normal business hours at RUS, room 2845, U.S. Department of Agriculture, Washington, DC 20250 or at the Office of the Federal Register, 800 North Capitol Street, NW., suite 700, Washington, DC. Copies are available from ICEA, P. O. Box 440, South Yarmouth, MA 02664, telephone number (508) 394 - 4424. (7) American Society for Testing and Materials specifications (ASTM) A 505-87, Standard Specification for Steel, Sheet and Strip, Alloy, Hot-Rolled and Cold-Rolled, General Requirements For; ASTM B 193-87, Standard Test Method for Resistivity of Electrical Conductor Materials; ASTM B 224-80, Standard Classification of Coppers; ASTM B 694-86, Standard Specification for Copper, Copper Alloy, and Copper-Clad Stainless Steel Sheet and Strip for Electrical Cable Shielding; ASTM D 4565-90a, Standard Test Methods for Physical and Environmental Performance Properties of Insulations and Jackets for Telecommunications Wire and Cable; and ASTM D 4566-90, Standard Test Methods for Electrical Performance Properties of Insulations and Jackets for Telecommunications Wire and Cable referenced in this section are incorporated by reference by RUS. These incorporations by references were approved by the Director of the Federal Register in accordance with 5 U.S.C. 552(a) and 1 CFR part 51. Copies of the ASTM standards are available for inspection during normal business hours at RUS, room 2845, U.S. Department of Agriculture, Washington, DC 20250 or at the Office of the Federal Register, 800 North Capitol Street, NW., suite 700, Washington, DC. Copies are available from ASTM, 1916 Race Street, Philadelphia, PA 19103 - 1187, telephone number (215) 299 - 5585. (b) Conductors and conductor insulation. (1) The gauge sizes of the copper conductors covered by this specification must be 19, 22, 24, and 26 American Wire Gauge (AWG). (2) Each conductor must comply with the requirements specified in ANSI/ICEA S-84 - 608 - 1988, paragraph 2.1. (3) Factory joints made in conductors during the manufacturing process must comply with the requirements specified in ANSI/ICEA S-84 - 608 - 1988, paragraph 2.2. (4) The raw materials used for conductor insulation must comply with the requirements specified in ANSI/ICEA S-84 - 608 - 1988, paragraphs 3.1 through 3.1.3. (5) The finished conductor insulation must comply with the requirements specified in ANSI/ICEA S-84 - 608 - 1988, paragraphs 3.2.1 and 3.3. (6) Insulated conductors must not have an overall diameter greater than 2 millimeters (mm) (0.081 inch (in.)). (7) A permissible overall performance level of faults in conductor insulation must average not greater than one fault per 12,000 conductor meters (40,000 conductor feet) for each gauge of conductor. (i) All insulated conductors must be continuously tested for insulation faults during the twinning operation with a method of testing acceptable to RUS. The length count and number of faults must be recorded. The information must be retained for a period of 6 months and be available for review by RUS when requested. (ii) The voltages for determining compliance with the requirements (TABLE START)of this section are as follows: @h1AWG @h1Direct Current Voltages (kilovolts) 19 .... 8.0 22 .... 6.0 24 .... 5.0 26 .... 4.0 (TABLE END) (8) Repairs to the conductor insulation during manufacture are permissible. The method of repair must be accepted by RUS prior to its use. The repaired insulation must be capable of meeting the relevant electrical requirements of this section. (9) All repaired sections of insulation must be retested in the same manner as originally tested for compliance with paragraph (b)(7) of this section. (10) The colored insulating material removed from or tested on the conductor, from a finished cable, must meet the performance requirements specified in ANSI/ICEA S-84 - 608 - 1988, paragraphs 3.4.1, 3.4.2, 3.4.4, 3.4.5, and 3.4.6. (c) Identification of pairs and twisting of pairs. (1) The insulation must be colored to identify: (i) The tip and ring conductor of each pair; and (ii) Each pair in the completed cable. (2) The colors to be used in the pairs in the 25 pair group, together with the pair numbers must be in accordance with the table specified in ANSI/ICEA S-84 - 608 - 1988, paragraph 3.5. (3) Positive identification of the tip and ring conductors of each pair by marking each conductor of a pair with the color of its mate is permissible. The method of marking must be accepted by RUS prior to its use. (4) Other methods of providing positive identification of the tip and ring conductors of each pair may be employed if accepted by RUS prior to its use. (5) The insulated conductors must be twisted into pairs. (6) In order to provide sufficiently high crosstalk isolation, the pair twists must be designed to enable the cable to meet the capacitance unbalance and crosstalk loss requirements of paragraphs (k)(5), (k)(6), and (k)(8) of this section. (7) The average length of pair twists in any pair in the finished cable, when measured on any 3 meter (10 foot) length, must not exceed the requirement specified in ANSI/ICEA S-84 - 608 - 1988, paragraph 3.5. (d) Forming of the cable core. (1) Twisted pairs must be assembled in such a way as to form a substantially cylindrical group. (2) When desired for lay-up reasons, the basic group may be divided into two or more subgroups called units. (3) Each group, or unit in a particular group, must be enclosed in bindings of the colors indicated for its particular pair count. The pair count, indicated by the colors of insulation, must be consecutive as indicated in paragraph (d)(6) of this section through units in a group. (4) The filling compound must be applied to the cable core in such a way as to provide as near a completely filled core as is commercially practical. (5) Threads and tapes used as binders must comply with the requirements specified in ANSI/ICEA S-84 - 608 - 1988, paragraphs 4.2 and 4.2.1. (6) The colors of the bindings and their significance with respect (TABLE START)to pair count must be as follows: @h1Group No. @h1Color of Bindings @h1Group Pair Count 1 .... White-Blue .... 1 - 25 2 .... White-Orange .... 26 - 50 3 .... White-Green .... 51 - 75 4 .... White-Brown .... 76 - 100 5 .... White-Slate .... 101 - 125 6 .... Red-Blue .... 126 - 150 7 .... Red-Orange .... 151 - 175 8 .... Red-Green .... 176 - 200 9 .... Red-Brown .... 201 - 225 10 .... Red-Slate .... 226 - 250 11 .... Black-Blue .... 251 - 275 12 .... Black-Orange .... 276 - 300 13 .... Black-Green .... 301 - 325 14 .... Black-Brown .... 326 - 350 15 .... Black-Slate .... 351 - 375 16 .... Yellow-Blue .... 376 - 400 17 .... Yellow-Orange .... 401 - 425 18 .... Yellow-Green .... 426 - 450 19 .... Yellow-Brown .... 451 - 475 20 .... Yellow-Slate .... 476 - 500 21 .... Violet-Blue .... 501 - 525 22 .... Violet-Orange .... 526 - 550 23 .... Violet-Green .... 551 - 575 24 .... Violet-Brown .... 576 - 600 (TABLE END) (7) The use of the white unit binder in cables of 100 pairs or less is optional. (8) When desired for manufacturing reasons, two or more 25 pair groups may be bound together with nonhygroscopic and nonwicking threads or tapes into a super-unit. Threads or tapes must meet the requirements specified in paragraph (d)(5) of this section. The group binders and the super-unit binders must be color coded such that the combination of the two binders must positively identify each 25 pair group from every other 25 pair group in the (TABLE START)cable. Super-unit binders must be of the color shown in the following table: Super-Unit Binder Colors @h1Pair Numbers @h1Binder Color 1 - 600 .... White 601 - 1200 .... Red 1201 - 1800 .... Black 1801 - 2400 .... Yellow 2401 - 3000 .... Violet (TABLE END) (9) Color binders must not be missing for more than 90 meters (300 feet) from any 25 pair group or from any subgroup used as part of a super-unit. At any cable cross-section, no adjacent 25 pair groups and no more than one subgroup of any super-unit may have missing binders. In no case must the total number of missing binders exceed three. Missing super-unit binders must not be permitted for any distance. (10) Any reel of cable which contains missing binders must be labeled indicating the colors and location of the binders involved. The labeling must be applied to the reel and also to the cable. (e) Screened cable. (1) Screened cable must be constructed such that a metallic, internal screen(s) must be provided to separate and provide sufficient isolation between the compartments to meet the requirements of this section. (2) At the option of the user or manufacturer, identified service pairs providing for voice order and fault location may be placed in screened cables. (i) The number of service pairs provided must be one per twenty-five operating pairs plus two for a cable size up to and including 400 pairs, subject to a minimum of four service pairs. The pair counts for screened (TABLE START)cables are as follows: Screened Cable Pair Counts @h1Carrier Pair Count @h1Service Pairs @h1Total Pair Count 24 .... 4 .... 28 50 .... 4 .... 54 100 .... 6 .... 106 150 .... 8 .... 158 200 .... 10 .... 210 300 .... 14 .... 314 400 .... 18 .... 418 (TABLE END) (ii) The service pairs must be equally divided among the compartments. The color sequence must be repeated in each compartment. (iii) The electrical and physical characteristics of each service pair must meet all the requirements set forth in this section. (iv) The colors used for the service pairs must be in accordance with the requirements of paragraph (b)(5) of this section. The color code used for the service pairs together with the service pair number are shown in the (TABLE START)following table: Color Code For Service Pairs @h1Service Pair No. @h1Color@h2Tip@h2Ring 1 .... White .... Red 2 .... '' .... Black 3 .... '' .... Yellow 4 .... '' .... Violet 5 .... Red .... Black 6 .... '' .... Yellow 7 .... '' .... Violet 8 .... Black .... Yellow 9 .... '' .... Violet (TABLE END) (3) The screen tape must comply with the requirements specified in ANSI/ICEA S-84 - 608 - 1988, paragraphs 5.1 through 5.4. (4) The screen tape must be tested for dielectric strength by completely removing the protective coating from one end to be used for grounding purposes. (i) Using an electrode, over a 30 centimeter (1 foot) length, apply a direct current voltage at the rate of rise of 500 volts/second until failure. (ii) No breakdown should occur below 8 kilovolts. (f) Filling compound. (1) After or during the stranding operation and prior to application of the core wrap, filling compound must be applied to the cable core. The compound must be as nearly colorless as is commercially feasible and consistent with the end product requirements and pair identification. (2) The filling compound must comply with the requirements specified in ANSI/ICEA S-84 - 608 - 1988, paragraphs 4.4 through 4.4.4. (3) The individual cable manufacturer must satisfy RUS that the filling compound selected for use is suitable for its intended application. The filling compound must be applied to the cable in such a manner that the cable components will not be degraded. (g) Core wrap. (1) The core wrap must comply with the requirements specified in ANSI/ICEA-S-84 - 608 - 1988, paragraph 4.3. (2) If required for manufacturing reasons, white or colored binders of nonhygroscopic and nonwicking material may be applied over the core and/or wrap. When used, binders must meet the requirements specified in paragraph (d)(5) of this section. (3) Sufficient filling compound must be applied to the core wrap so that voids or air spaces existing between the core and the inner side of the core wrap are minimized. (h) Flooding compound (1) Sufficient flooding compound must be applied on all sheath interfaces so that voids and air spaces in these areas are minimized. When the optional armored design is used, the flooding compound must be applied between the core wrap and shield, between the shield and armor, and between the armor and the jacket so that voids and air spaces in these areas are minimized. The use of floodant over the outer metallic substrate is not required if uniform bonding, per paragraph (i)(7) of this section, is achieved between the plastic-clad metal and the jacket. (2) The flooding compound must comply with the requirements specified in ANSI/ICEA S-84 - 608 - 1988, paragraph 4.5 and the jacket slip test requirements of appendix A, paragraph (III)(5) of this section. (3) The individual cable manufacturer must satisfy RUS that the flooding compound selected for use is acceptable for the application. (i) Shield and optional armor (1) A single corrugated shield must be applied longitudinally over the core wrap. (2) For unarmored cable the shield overlap must comply with the requirements specified in ANSI/ICEA S-84 - 608 - 1988, paragraph 6.3.2. Core diameter is defined as the diameter under the core wrap and binding. (3) For cables containing the coated aluminum shield/coated steel armor (CACSP) sheath design, the coated aluminum shield must be applied in accordance with the requirements specified in ANSI/ICEA S-84 - 608 - 1988, paragraph 6.3.2, Dual Tape Shielding System. (4) General requirements for application of the shielding material are as follows: (i) Successive lengths of shielding tapes may be joined during the manufacturing process by means of cold weld, electric weld, soldering with a nonacid flux, or other acceptable means. (ii) Shield splices must comply with the requirements specified in ANSI/ICEA S-84 - 608 - 1988, paragraph 6.3.3. (iii) The corrugations and the application process of the coated aluminum and copper bearing shields must comply with the requirements specified in ANSI/ICEA S-84 - 608 - 1988, paragraph 6.3.1. (iv) The shielding material must be applied in such a manner as to enable the cable to pass the cold bend test specified in paragraph (l)(3) of this section. (5) The following is a list of acceptable materials for use as cable shielding. Other types of shielding materials may also be used provided (TABLE START)they are accepted by RUS prior to their use. @h1Standard Cable @h1Gopher Resistant Cable 8-mil Coated Aluminum1 .... 10-mil Copper 5-mil Copper .... 6-mil Copper-CladStainless Steel5 mil Copper-CladStainless Steel5 mil Copper-Clad AlloySteel7-mil Alloy 1946-mil Alloy 1948-mil Coated Aluminum1and 6-mil Coated Steel1 Footnote: \1\Dimensions of uncoated metal (TABLE END) (i) The 8-mil aluminum tape must be plastic coated on both sides and must comply with the requirements of ANSI/ICEA S-84 - 608 - 1988, paragraph 6.2.2. (ii) The 5-mil copper tape must comply with the requirements specified in ANSI/ICEA S-84 - 608 - 1988, paragraph 6.2.3. (iii) The 10-mil copper tape must comply with the requirements specified in ANSI/ICEA S-84 - 608 - 1988, paragraph 6.2.4. (iv) The 6-mil copper clad stainless steel tape must comply with the requirements specified in ANSI/ICEA S-84 - 608 - 1988, paragraph 6.2.5. (v) The 5-mil copper clad stainless steel tape must be in the fully annealed condition and must conform to the requirements of American Society for Testing and Materials (ASTM) B 694 - 86, with a cladding ratio of 16/68/16. (A) The electrical conductivity of the clad tape must be a minimum of 28 percent of the International Annealed Copper Standard (IACS) when measured per ASTM B 193 - 87. (B) The tape must be nominally 0.13 millimeter (0.005 inch) thick with a minimum thickness of 0.11 millimeter (0.0045 inch). (vi) The 5-mil copper clad alloy steel tape must be in the fully annealed condition and the copper component must conform to the requirements of ASTM B 224 - 80 and the alloy steel component must conform to the requirements of ASTM A 505 - 87, with a cladding ratio of 16/68/16. (A) The electrical conductivity of the copper clad alloy steel tape must comply with the requirement specified in paragraph (i)(5)(v)(A) of this section. (B) The thickness of the copper clad alloy steel tape must comply with the requirements specified in paragraph (i)(5)(v)(B) of this section. (vii) The 6-mil and 7-mil 194 copper alloy tapes must comply with the requirements specified in ANSI/ICEA S-84 - 608 - 1988, paragraph 6.2.6. (6) The corrugation extensibility of the coated aluminum shield must comply with the requirements specified in ANSI/ICEA S-84 - 608 - 1988, paragraph 6.4. (7) When the jacket is bonded to the plastic coated aluminum shield, the bond between the jacket and shield must comply with the requirements specified in ANSI/ICEA S-84 - 608 - 1988, paragraph 7.2.6. (8) A single plastic-coated steel corrugated armor must be applied longitudinally directly over the coated aluminum shield listed in paragraph (i)(5) of this section with an overlap complying with the requirements specified in ANSI/ICEA S-84 - 608 - 1988, paragraph 6.3.2, Outer Steel Tape. (9) Successive lengths of steel armoring tapes may be joined during the manufacturing process by means of cold weld, electric weld, soldering with a nonacid flux, or other acceptable means. Armor splices must comply with the breaking strength and resistance requirements specified in ANSI/ICEA S-84 - 608 - 1988, paragraph 6.3.3. (10) The corrugations and the application process of the coated steel armor must comply with the requirements specified in ANSI/ICEA S-84 - 608 - 1988, paragraph 6.3.1. (i) The corrugations of the armor tape must coincide with the corrugations of the coated aluminum shield. (ii) Overlapped portions of the armor tape must be in register (corrugations must coincide at overlap) and in contact at the outer edge. (11) The armoring material must be so applied to enable the cable to pass the cold bend test as specified in paragraph (l)(3) of this section. (12) The 6-mil steel tape must be electrolytic chrome-coated steel (ECCS) plastic coated on both sides and must comply with the requirements specified in ANSI/ICEA S-84 - 608 - 1988, paragraph 6.2.8. (13) When the jacket is bonded to the plastic-coated steel armor, the bond between the jacket and armor must comply with the requirement specified in ANSI/ICEA-S-84 - 608 - 1988, paragraph 7.2.6. (j) Cable jacket. (1) The jacket must comply with the requirements specified in ANSI/ICEA S-84 - 608 - 1988, paragraph 7.2. (2) The raw materials used for the cable jacket must comply with the requirements specified in ANSI/ICEA S-84 - 608 - 1988, paragraph 7.2.1. (3) Jacketing material removed from or tested on the cable must meet the performance requirements specified in ANSI/ICEA S-84 - 608 - 1988, paragraphs 7.2.3 and 7.2.4. (4) The thickness of the jacket must comply with the requirements specified in ANSI/ICEA S-84 - 608 - 1988, paragraph 7.2.2. (k) Electrical requirements -- (1) Conductor resistance. The direct current resistance of any conductor in a completed cable and the average resistance of all conductors in a Quality Control Lot must comply with the requirements specified in ANSI/ICEA S-84 - 608 - 1988, paragraph 8.1. (2) Resistance unbalance. (i) The direct current resistance unbalance between the two conductors of any pair in a completed cable and the average resistance unbalance of all pairs in a completed cable must comply with the requirements specified in ANSI/ICEA S-84 - 608 - 1988, paragraph 8.2. (ii) The resistance unbalance between tip and ring conductors shall be random with respect to the direction of unbalance. That is, the resistance of the tip conductors shall not be consistently higher with respect to the ring conductors and vice versa. (3) Mutual capacitance. The average mutual capacitance of all pairs in a completed cable and the individual mutual capacitance of any pair in a completed cable must comply with the requirements specified in ANSI/ICEA S-84 - 608 - 1988, paragraph 8.3. (4) Capacitance difference. (i) The capacitance difference for completed cables having 75 pairs or greater must comply with the requirement specified in ANSI/ICEA S-84 - 608 - 1988, paragraph 8.4. (ii) When measuring screened cable, the inner and outer pairs must be selected from both sides of the screen. (5) Pair-to-pair capacitance unbalance -- (i) Pair-to-pair. The capacitance unbalance as measured on the completed cable must comply with the requirements specified in ANSI/ICEA S-84 - 608 - 1988, paragraph 8.5. (ii) Screened cable. In cables with 25 pairs or less and within each group of multigroup cables, the pair-to-pair capacitance unbalance between any two pairs in an individual compartment must comply with the requirements specified in ANSI/ICEA S-84 - 608 - 1988, paragraph 8.5. The pair-to-pair capacitance unbalances to be considered must be: (A) Between pairs adjacent in a layer in an individual compartment; (B) Between pairs in centers of 4 pairs or less in an individual compartment; and (C) Between pairs in adjacent layers in an individual compartment when the number of pairs in the inner (smaller) layer is 6 or less. The center is counted as a layer. (iii) In cables with 25 pairs or less, the root-mean-square (rms) value must include all the pair-to-pair unbalances measured for each compartment separately. (iv) In cables containing more than 25 pairs, the rms value must include the pair-to-pair unbalances in the separate compartments. (6) Pair-to-ground capacitance unbalance -- (i) Pair-to-ground. The capacitance unbalance as measured on the completed cable must comply with the requirements specified in ANSI/ICEA S-84 - 608 - 1988, paragraph 8.6. (ii) When measuring pair-to-ground capacitance unbalance all pairs except the pair under test are grounded to the shield and/or shield/armor except when measuring cables containing super units in which case all other pairs in the same super unit must be grounded to the shield. (iii) The screen tape must be left floating during the test. (iv) Pair-to-ground capacitance unbalance may vary directly with the length of the cable. (7) Attenuation. (i) For nonscreened and screened cables, the average attenuation of all pairs on any reel when measured at 150 and 772 kilohertz must comply with the requirements specified in ANSI/ICEA S-84 - 608 - 1988, paragraph 8.7, Solid Column. (ii) For T1C type cables over 12 pairs, the maximum average attenuation of all pairs on any reel must not exceed the values listed below when measured at a frequency of 1576 kilohertz at or corrected to a temperature of 20 ÿ1B 1«C. The test must be conducted in (TABLE START)accordance with ASTM D 4566 - 90. @h1AWG @h1Maximum Average Attenuation decibel/kilometer (dB/km) (decibel/mile) 19 .... 13.4 (21.5) 22 .... 18.3 (29.4) 24 .... 23.1 (37.2) (TABLE END) (8) Crosstalk loss. (i) The equal level far-end power sum crosstalk loss (FEXT) as measured on the completed cable must comply with the requirements specified in ANSI/ICEA S-84 - 608 - 1988, paragraph 8.8, FEXT Table. (ii) The near-end power sum crosstalk loss (NEXT) as measured on completed cable must comply with the requirements specified in ANSI/ICEA S-84 - 608 - 1988, paragraph 8.8, NEXT Table. (iii) Screened cable. (A) For screened cables the NEXT as measured on the completed cable must comply with the requirements specified in ANSI/ICEA S-84 - 608 - 1988, paragraphs 8.9 and 8.9.1. (B) For T1C screened cable the NEXT as measured on the completed cable must comply with the requirements specified in ANSI/ICEA S-84 - 608 - 1988, paragraphs 8.9 and 8.9.2. (9) Insulation resistance. The insulation resistance of each insulated conductor in a completed cable must comply with the requirement specified in ANSI/ICEA S-84 - 608 - 1988, paragraph 8.11. (10) High voltage test. (i) In each length of completed cable, the insulation between conductors must comply with the requirements specified in ANSI/ICEA S-84 - 608 - 1988, paragraph 8.12, Solid Column. (ii) In each length of completed cable, the dielectric between the shield and/or armor and conductors in the core must comply with the requirements specified in ANSI/ICEA S-84 - 608 - 1988, paragraph 8.13, Single Jacketed, Solid Column. In screened cable the screen tape must be left floating. (iii) Screened cable. (A) In each length of completed screened cable, the dielectric between the screen tape and the conductors in the core must comply with the requirement specified in ANSI/ICEA S-84 - 608 - 1988, paragraph 8.14. (B) In this test, the cable shield and/or armor must be left floating.I11(11) Electrical variations. (i) Pairs in each length of cable having either a ground, cross, short, or open circuit condition will not be permitted. (ii) The maximum number of pairs in a cable which may vary as specified in paragraph (k)(11)(iii) of this section from the electrical parameters given in this section are listed below. These pairs may be excluded (TABLE START)from the arithmetic calculation. @h1Nominal Pair Count @h1Maximum Number of Pairs With Allowable Electrical Variation 6 - 100 .... 1 101 - 300 .... 2 301 - 400 .... 3 401 - 600 .... 4 601 and above .... 6 (TABLE END) (iii) Parameter variations. (A) Capacitance unbalance-to-ground. If the cable fails either the maximum individual pair or average capacitance unbalance-to-ground requirement and all individual pairs are 3937 picofarad/kilometer (1200 picofarad/1000 feet) or less, the number of pairs specified in paragraph (k)(11)(ii) of this section may be eliminated from the average and maximum individual calculations. (B) Resistance unbalance. Individual pair of 7 percent for all gauges. (C) Conductor resistance, maximum. The following table shows (TABLE START)maximum conductor resistance: @h1AWG @h1ohms/kilometer @h1(ohms/1000 feet) 19 .... 29.9 .... ( 9.1) 22 .... 60.0 .... (18.3) 24 .... 94.5 .... (28.8) 26 .... 151.6 .... (46.2) Footnote: Note: RUS recognizes that in large pair count cable (600 pair and above) a cross, short or open circuit condition occasionally may develop in a pair which does not affect the performance of the other cable pairs. In these circumstances rejection of the entire cable may be economically unsound or repairs may be impractical. In such circumstances the manufacturer may desire to negotiate with the customer for acceptance of the cable. No more than 0.5 percent of the pairs may be involved. (TABLE END) (l) Mechanical requirements -- (1) Compound flow test. All cables manufactured in accordance with the requirements of this section must be capable of meeting the compound flow test specified in ANSI/ICEA S-84 - 608 - 1988, paragraph 9.1 using a test temperature of 80 ÿ1B 1«C. (2) Water penetration. All cables manufactured in accordance with the requirements of this section must be capable of meeting the water penetration test specified in ANSI/ICEA S-84 - 608 - 1988, paragraph 9.2. (3) Cable cold bend test. All cables manufactured in accordance with the requirements of this section must be capable of meeting the cable cold bend test specified in ANSI/ICEA S-84 - 608 - 1988, paragraph 9.3. (4) Cable impact test. All cables manufactured in accordance with the requirements of this section must be capable of meeting the cable impact test specified in ANSI/ICEA S-84 - 608 - 1988, paragraph 9.4. (5) Jacket notch test (CACSP sheath only). All cables utilizing the coated aluminum/coated steel sheath (CACSP) design manufactured in accordance with the requirements of this section must be capable of meeting the jacket notch test specified in ANSI/ICEA S-84 - 608 - 1988, paragraph 9.5. (6) Cable torsion test (CACSP sheath only). All cables utilizing the coated aluminum/coated steel sheath (CACSP) design manufactured in accordance with the requirements of this section must be capable of meeting the cable torsion test specified in ANSI/ICEA S-84 - 608 - 1988, paragraph 9.6. (m) Sheath slitting cord (optional). (1) Sheath slitting cords may be used in the cable structure at the option of the manufacturer unless specified by the end user. (2) When a sheath slitting cord is used it must be nonhygroscopic and nonwicking, continuous throughout a length of cable and of sufficient strength to open the sheath without breaking the cord. (n) Identification marker and length marker. (1) Each length of cable must be identified in accordance with ANSI/ICEA S-84 - 608 - 1988, paragraphs 10.1 through 10.1.4. The color of the ink used for the initial outer jacket marking must be either white or silver. (2) The markings must be printed on the jacket at regular intervals of not more than 0.6 meter (2 feet). (3) The completed cable must have sequentially numbered length markers in accordance with ANSI/ICEA S-84 - 608 - 1988, paragraph 10.1.5. The color of the ink used for the initial outer jacket marking must be either white or silver. (o) Preconnectorized cable (optional). (1) At the option of the manufacturer and upon request by the purchaser, cables 100 pairs and larger may be factory terminated in 25 pair splicing modules. (2) The splicing modules must meet the requirements of RUS Bulletin 345 - 54, PE-52, RUS Specification for Telephone Cable Splicing Connectors (Incorporated by reference at _1755.97), and be accepted by RUS prior to their use. (p) Acceptance testing and extent of testing. (1) The tests described in appendix A of this section are intended for acceptance of cable designs and major modifications of accepted designs. What constitutes a major modification is at the discretion of RUS. These tests are intended to show the inherent capability of the manufacturer to produce cable products having long life and stability. (2) For initial acceptance, the manufacturer must submit: (i) An original signature certification that the product fully complies with each section of the specification; (ii) Qualification Test Data, per appendix A of this section; (iii) To periodic plant inspections; (iv) A certification that the product does or does not comply with the domestic origin manufacturing provisions of the ``Buy American'' requirements of the Rural Electrification Act of 1938 (7 U.S.C. 901 et seq.); (v) Written user testimonials concerning field performance of the product; and (vi) Other nonproprietary data deemed necessary by the Chief, Outside Plant Branch (Telephone). (3) For requalification acceptance, the manufacturer must submit an original signature certification that the product fully complies with each section of the specification, excluding the Qualification Section, and a certification that the product does or does not comply with the domestic origin manufacturing provisions of the ``Buy American'' requirements of the Rural Electrification Act of 1938 (7 U.S.C. 901 et seq.), for acceptance by August 30 of each year. The required data must have been gathered within 90 days of the submission. If the initial acceptance of a product to this specification was within 180 days of August 30, then requalification for that product will not be required for that year. (4) Initial and requalification acceptance requests should be addressed to: Chairman, Technical Standards Committee ``A'' (Telephone), Telecommunications Standards Division, Rural Utilities Service, Washington, DC 20250 - 1500. (5) Tests on 100 percent of completed cable. (i) The shield and/or armor of each length of cable must be tested for continuity in accordance with ANSI/ICEA S-84 - 608 - 1988, paragraph 8.16. (ii) The screen tape of each length of screened cable must be tested for continuity in accordance with ANSI/ICEA S-84 - 608 - 1988, paragraph 8.16. (iii) Dielectric strength between conductors and shield and/or armor must be tested to determine freedom from grounds in accordance with paragraph (k)(10)(ii) of this section. (iv) Dielectric strength between conductors and screen tape must be tested to determine freedom from grounds in accordance with paragraph (k)(10)(iii) of this section. (v) Each conductor in the completed cable must be tested for continuity in accordance with ANSI/ICEA S-84 - 608 - 1988, paragraph 8.16. (vi) Dielectric strength between conductors must be tested to insure freedom from shorts and crosses in each length of completed cable in accordance with paragraph (k)(10)(i) of this section. (vii) Each conductor in the completed preconnectorized cable must be tested for continuity. (viii) Each length of completed preconnectorized cable must be tested for split pairs. (ix) The average mutual capacitance must be measured on all cables. If the average mutual capacitance for the first 100 pairs tested from randomly selected groups is between 50 and 53 nanofarad/kilometer (nF/km) (80 and 85 nanofarad/mile), the remainder of the pairs need not be tested on the 100 percent basis (See paragraph (k)(3) of this section). (6) Capability tests. Tests on a quality assurance basis must be made as frequently as is required for each manufacturer to determine and maintain compliance with: (i) Performance requirements for conductor insulation, jacketing material, and filling and flooding compounds; (ii) Bonding properties of coated or laminated shielding and armoring materials and performance requirements for screen tape; (iii) Sequential marking and lettering; (iv) Capacitance difference, capacitance unbalance, crosstalk, and attenuation; (v) Insulation resistance, conductor resistance and resistance unbalance; (vi) Cable cold bend and cable impact tests; (vii) Water penetration and compound flow tests; and (viii) Jacket notch and cable torsion tests. (q) Summary of records of electrical and physical tests. (1) Each manufacturer must maintain suitable summary records for a period of at least 3 years of all electrical and physical tests required on completed cable by this section as set forth in paragraphs (p)(5) and (p)(6) of this section. The test data for a particular reel must be in a form that it may be readily available to the purchaser or to RUS upon request. (2) Measurements and computed values must be rounded off to the number of places or figures specified for the requirement according to ANSI/ICEA S-84 - 608 - 1988, paragraph 1.3. (r) Manufacturing irregularities. (1) Repairs to the shield and/or armor are not permitted in cable supplied to end users under this section. (2) Minor defects in jackets (defects having a dimension of 3 millimeters (0.125 inch) or less in any direction) may be repaired by means of heat fusing in accordance with good commercial practices utilizing sheath grade compounds. (s) Preparation for shipment. (1) The cable must be shipped on reels. The diameter of the drum must be large enough to prevent damage to the cable from reeling or unreeling. The reels must be substantial and so constructed as to prevent damage to the cable during shipment and handling. (2) The thermal wrap must comply with the requirements of ANSI/ICEA S-84 - 608 - 1988, paragraph 10.3. When a thermal reel wrap is supplied, the wrap must be applied to the reel and must be suitably secured in place to minimize thermal exposure to the cable during storage and shipment. The use of the thermal reel wrap as a means of reel protection will be at the option of the manufacturer unless specified by the end user. (3) The outer end of the cable must be securely fastened to the reel head so as to prevent the cable from becoming loose in transit. The inner end of the cable must be securely fastened in such a way as to make it readily available if required for electrical testing. Spikes, staples, or other fastening devices which penetrate the cable jacket must not be used. The method of fastening the cable ends must be accepted by RUS prior to its use. (4) Each length of cable must be wound on a separate reel unless otherwise specified or agreed to by the purchaser. (5) The arbor hole must admit a spindle 63 millimeters (2.5 inches) in diameter without binding. Steel arbor hole liners may be used but must be accepted by RUS prior to their use. (6) Each reel must be plainly marked to indicate the direction in which it should be rolled to prevent loosening of the cable on the reel. (7) Each reel must be stenciled or labeled on either one or both sides with the information specified in ANSI/ICEA S-84 - 608 - 1988, paragraph 10.4 and the RUS cable designation: Cable Designation BFC Cable Construction Pair Count Conductor Gauge A = Coated Aluminum Shield C = Copper Shield Y = Gopher Resistant Shield X = Armored, Separate Shield H = T1 Screened Cable H1C = T1C Screened Cable P = Preconnectorized Example: BFCXH100 - 22 Buried Filled Cable, Armored (w/separate shield), T1 Screened Cable, 100 pair, 22 AWG. (8) When cable manufactured to the requirements of this section is shipped, both ends must be equipped with end caps acceptable to RUS. (9) When preconnectorized cables are shipped, the splicing modules must be protected to prevent damage during shipment and handling. The protection method must be acceptable to RUS and accepted prior to its use. (10) All cables ordered for use in underground duct applications must be equipped with a factory-installed pulling-eye on the outer end in accordance with ANSI/ICEA S-84 - 608 - 1988, paragraph 10.5.2. (The information and recordkeeping requirements of this section have been approved by the Office of Management and Budget (OMB) under the control number 0572 - 0059) Appendix A to 7 CFR 1755.390 -- Qualification Test Methods (I) The test procedures described in this appendix are for qualification of initial designs and major modification of accepted designs. Included in (V) of this appendix are suggested formats that may be used in submitting the test results to RUS. (II) Sample selection and preparation. (1) All testing must be performed on lengths removed sequentially from the same 25 pair, 22 gauge jacketed cable. This cable must not have been exposed to temperatures in excess of 38«C since its initial cool down after sheathing. The lengths specified are minimum lengths and if desirable from a laboratory testing standpoint longer lengths may be used. (a) Length A shall be 10 ÿ1B 0.2 meters (33 ÿ1B 0.5 feet) long and must be maintained at 23 ÿ1B 3«C. One length is required. (b) Length B shall be 12 ÿ1B 0.2 meters (40 ÿ1B 0.5 feet) long. Prepare the test sample by removing the jacket, shield or shield/armor and core wrap for a sufficient distance on both ends to allow the insulated conductors to be flared out. Remove sufficient conductor insulation so that appropriate electrical test connections can be made at both ends. Coil the sample with a diameter of 15 to 20 times its sheath diameter. Three lengths are required. (c) Length C shall be one meter (3 feet) long. Four lengths are required. (d) Length D shall be 300 millimeters (1 foot) long. Four lengths are required. (e) Length E must be 600 millimeters (2 feet) long. Four lengths are required. (f) Length F shall be 3 meters (10 feet) long and must be maintained at 23 ÿ1B 3«C for the duration of the test. Two lengths are required. (2) Data reference temperature. Unless otherwise specified, all measurements must be made at 23 ÿ1B 3«C. (III) Environmental tests -- (1) Heat aging test -- (a) Test samples. Place one sample each of lengths B, C, D and E in an oven or environmental chamber. The ends of Sample B must exit from the chamber or oven for electrical tests. Securely seal the oven exit holes. (b) Sequence of tests. The samples are to be subjected to the following tests after conditioning: (i) Water Immersion Test outlined in (III)(2) of this appendix; (ii) Water Penetration Test outlined in (III)(3) of this appendix; (iii) Insulation Compression Test outlined in (III)(4) of this appendix; and (iv) Jacket Slip Strength Test outlined in (III)(5) of this appendix. (c) Initial measurements. (i) For Sample B measure the open circuit capacitance for each odd numbered pair at 1, 150, and 772 kilohertz, and the attenuation at 150 and 772 kilohertz after conditioning the sample at the data reference temperature for 24 hours. Calculate the average and standard deviation for the data of the 13 pairs on a per kilometer or (on a per mile) basis. (ii) The attenuation at 150 and 772 kilohertz may be calculated from open circuit admittance (Yoc) and short circuit impedance (Zsc) or may be obtained by direct measurement of attenuation. (iii) Record on suggested formats in (V) of this appendix or on other easily readable formats. (d) Heat conditioning. (i) Immediately after completing the initial measurements, condition the sample for 14 days at a temperature of 65 ÿ1B 2«C. (ii) At the end of this period note any exudation of cable filler. Measure and calculate the parameters given in (III)(1)(c) of this appendix. Record on suggested formats in (V) of this appendix or on other easily readable formats. (iii) Cut away and discard a one meter (3 foot) section from each end of length B. (e) Overall electrical deviation. (i) Calculate the percent change in all average parameters between the final parameters after conditioning and the initial parameters in (III)(1)(c) of this appendix. (ii) The stability of the electrical parameters after completion of this test must be within the following prescribed limits: (A) Capacitance. The average mutual capacitance must be within 5 percent of its original value; (B) The change in average mutual capacitance must be less than 5 percent over frequency 1 to 150 kilohertz; and (C) Attenuation. The 150 and 772 kilohertz attenuation must not have increased by more than 5 percent over their original values. (2) Water immersion electrical test -- (a) Test sample selection. The 10 meter (33 foot) section of length B must be tested. (b) Test sample preparation. Prepare the sample by removing the jacket, shield or shield/armor, and core wrap for sufficient distance to allow one end to be accessed for test connections. Cut out a series of 6 millimeter (0.25 inch) diameter holes along the test sample, at 30 centimeters (1 foot) intervals progressing successively 90 degrees around the circumference of the cable. Assure that the cable core is exposed at each hole by slitting the core wrapper. Place the prepared sample in a dry vessel which when filled will maintain a one meter (3 foot) head of water over 6 meters (20 feet) of uncoiled cable. Extend and fasten the ends of the cable so they will be above the water line and the pairs are rigidly held for the duration of the test. (c) Capacitance testing. Measure the initial values of mutual capacitance of all odd pairs in each cable at a frequency of 1 kilohertz before filling the vessel with water. Be sure the cable shield or shield/armor is grounded to the test equipment. Fill the vessels until there is a one meter (3 foot) head of water on the cables. (i) Remeasure the mutual capacitance after the cables have been submerged for 24 hours and again after 30 days. (ii) Record each sample separately on suggested formats in (V) of this appendix or on other easily readable formats. (d) Overall electrical deviation. (i) Calculate the percent change in all average parameters between the final parameters after conditioning with the initial parameters in (III)(2)(c) of this appendix. (ii) The average mutual capacitance must be within 5 percent of its original value. (3) Water penetration testing. (a) A watertight closure must be placed over the jacket of length C. The closure must not be placed over the jacket so tightly that the flow of water through pre-existing voids of air spaces is restricted. The other end of the sample must remain open. (b) Test per Option A or Option B -- (i) Option A. Weigh the sample and closure prior to testing. Fill the closure with water and place under a continuous pressure of 10 ÿ1B 0.7 kilopascals (1.5 ÿ1B 0.1 pounds per square inch gauge) for one hour. Collect the water leakage from the end of the test sample during the test and weigh to the nearest 0.1 gram. Immediately after the one hour test, seal the ends of the cable with a thin layer of grease and remove all visible water from the closure, being careful not to remove water that penetrated into the core during the test. Reweigh the sample and determine the weight of water that penetrated into the core. The weight of water that penetrated into the core must not exceed 8 grams. (ii) Option B. Fill the closure with a 0.2 gram sodium fluorscein per liter water solution and apply a continuous pressure 10 ÿ1B 0.7 kilopascals (1.5 ÿ1B 0.1 pounds per square inch gauge) for one hour. Catch and weigh any water that leaks from the end of the cable during the one hour period. If no water leaks from the sample, carefully remove the water from the closure. Then carefully remove the jacket, shield or shield/armor and core wrap one at a time, examining with an ultraviolet light source for water penetration. After removal of the core wrap, carefully dissect the core and examine for water penetration within the core. Where water penetration is observed, measure the penetration distance. The distance of water penetration into the core must not exceed 127 millimeters (5.0 inches). (4) Insulation compression test -- (a) Test Sample D. Remove jacket, shield or shield/armor, and core wrap being careful not to damage the conductor insulation. Remove one pair from the core and carefully separate, wipe off core filler, and straighten the insulated conductors. Retwist the two insulated conductors together under sufficient tension to form 10 evenly spaced 360 degree twists in a length of 10 centimeters (4 inches). (b) Sample testing. Center the mid 50 millimeters (2 inches) of the twisted pair between 2 smooth rigid parallel metal plates that are 50 millimeters ÿ0A 50 millimeters (2 inches ÿ0A 2 inches). Apply a 1.5 volt direct current potential between the conductors, using a light or buzzer to indicate electrical contact between the conductors. Apply a constant load of 67 newtons (l5 pound-force) on the sample for one minute and monitor for evidence of contact between the conductors. Record results on suggested formats in (V) of this appendix or on other easily readable formats. (5) Jacket slip strength test -- (a) Sample selection. Test Sample E from (III)(1)(a) of this appendix. (b) Sample preparation. Prepare test sample in accordance with the procedures specified in ASTM D 4565 - 90a. (c) Sample conditioning and testing. Remove the sample from the tensile tester prior to testing and condition for one hour at 50 ÿ1B 2«C. Test immediately in accordance with the procedures specified in ASTM D 4565 - 90a. A minimum jacket slip strength of 67 newtons (15 pound-force) is required. Record the highest load attained. (6) Humidity exposure. (a) Repeat steps (III)(1)(a) through (III)(1)(c)(iii) of this appendix for separate set of samples B, C, D, and E which have not been subjected to prior environmental conditioning. (b) Immediately after completing the measurements, expose the test sample to 100 temperature cyclings. Relative humidity within the chamber must be maintained at 90 ÿ1B 2 percent. One cycle consists of beginning at a stabilized chamber and test sample temperature of 52 ÿ1B 1«C, increasing the temperature to 57 ÿ1B 1«C, allowing the chamber and test samples to stabilize at this level, then dropping the temperature back to 52 ÿ1B 1«C. (c) Repeat steps (III)(1)(d)(ii) through (III)(5)(c) of this appendix. (7) Temperature cycling. (a) Repeat steps (III)(1)(a) through (III)(1)(c)(iii) of this appendix for separate set of samples B, C, D, and E which have not been subjected to prior environmental conditioning. (b) Immediately after completing the measurements, subject the test sample to the 10 cycles of temperature between a minimum of 40«C and +60«C. The test sample must be held at each temperature extreme for a minimum of 1 1/2 hours during each cycle of temperature. The air within the temperature cycling chamber must be circulated throughout the duration of the cycling. (c) Repeat steps (III)(1)(d)(ii) through (III)(5)(c) of this appendix. (IV) Control sample -- (1) Test samples. A separate set of lengths A, C, D, E, and F must have been maintained at 23 ÿ1B 3«C for at least 48 hours before the testing. (2) Repeat steps (III)(2) through (III)(5)(c) of this appendix except use length A instead of length B. (3) Surge Test. (a) One length of sample F must be used to measure the breakdown between conductors while the other length of F must be used to measure the core to shield breakdown. (b) The samples must be capable of withstanding without damage, a single surge voltage of 20 kilovolts peak between conductors, and a 35 kilovolts peak surge voltage between conductors and the shield or shield/armor as hereinafter described. The surge voltage must be developed from a capacitor discharged through a forming resistor connected in parallel with the dielectric of the test sample. The surge generator constants must be such as to produce a surge of 1.5 ÿ0A 40 microsecond wave shape. (c) The shape of the generated wave must be determined at a reduced voltage by connecting an oscilloscope across the forming resistor with the cable sample connected in parallel with the forming resistor. The capacitor bank is charged to the test voltage and then discharged through the forming resistor and test sample. The test sample will be considered to have passed the test if there is no distinct change in the wave shape obtained with the initial reduced voltage compared to that obtained after the application of the test voltage. (V) The following suggested formats may be used in submitting the (TABLE START)test results to RUS: Environmental ConditioningXXXXXXX Frequency 1 kilohertz @h1Pair Number @h1Capacitance@h2nF/km (nanofarad/mile)@h3Initial@h3Final 1 .... XXXXXX .... XXXXXX 3 .... XXXXXX .... XXXXXX 5 .... XXXXXX .... XXXXXX 7 .... XXXXXX .... XXXXXX 9 .... XXXXXX .... XXXXXX 11 .... XXXXXX .... XXXXXX 13 .... XXXXXX .... XXXXXX 15 .... XXXXXX .... XXXXXX 17 .... XXXXXX .... XXXXXX 19 .... XXXXXX .... XXXXXX 21 .... XXXXXX .... XXXXXX 23 .... XXXXXX .... XXXXXX 25 .... XXXXXX .... XXXXXX Average xÿAE8 .... XXXXXX .... XXXXXX Footnote: Overall Percent (TABLE START)Difference in Average xÿAE8 XXXXXXX (TABLE END) Environmental ConditioningXXXXXXX Frequency 150 kilohertz @h1Pair Number @h1Capacitance@h2nF/km (nanofarad/mile)@h3Initial@h3Final @h1Attenuation@h2dB/km (decibel/mile)@h3Initial@h3Final 1 .... XXX .... XXX .... XXX .... XXX 3 .... XXX .... XXX .... XXX .... XXX 5 .... XXX .... XXX .... XXX .... XXX 7 .... XXX .... XXX .... XXX .... XXX 9 .... XXX .... XXX .... XXX .... XXX 11 .... XXX .... XXX .... XXX .... XXX 13 .... XXX .... XXX .... XXX .... XXX 15 .... XXX .... XXX .... XXX .... XXX 17 .... XXX .... XXX .... XXX .... XXX 19 .... XXX .... XXX .... XXX .... XXX 21 .... XXX .... XXX .... XXX .... XXX 23 .... XXX .... XXX .... XXX .... XXX 25 .... XXX .... XXX .... XXX .... XXX Average xÿAE8 .... XXX .... XXX .... XXX .... XXX Footnote: Overall Percent Difference in Average xÿAE8 Capacitance:XXXXXX (TABLE START)Conductance:XXXXXX (TABLE END) Environmental ConditioningXXXXXXX Frequency 772 kilohertz @h1Pair Number @h1Capacitance@h2nF/km (nanofarad/mile)@h3Initial@h3Final @h1Attenuation@h2dB/km (decibel/mile)@h3Initial@h3Final 1 .... XXX .... XXX .... XXX .... XXX 3 .... XXX .... XXX .... XXX .... XXX 5 .... XXX .... XXX .... XXX .... XXX 7 .... XXX .... XXX .... XXX .... XXX 9 .... XXX .... XXX .... XXX .... XXX 11 .... XXX .... XXX .... XXX .... XXX 13 .... XXX .... XXX .... XXX .... XXX 15 .... XXX .... XXX .... XXX .... XXX 17 .... XXX .... XXX .... XXX .... XXX 19 .... XXX .... XXX .... XXX .... XXX 21 .... XXX .... XXX .... XXX .... XXX 23 .... XXX .... XXX .... XXX .... XXX 25 .... XXX .... XXX .... XXX .... XXX Average xÿAE8 .... XXX .... XXX .... XXX .... XXX Footnote: Overall Percent Difference in Average xÿAE8 Capacitance:XXXXXX (TABLE START)Conductance:XXXXXX (TABLE END) Environmental ConditioningXXXXXXX Water Immersion Test (1 kilohertz) @h1Pair Number @h1Capacitance@h2nF/km (nanofarad/mile)@h3Initial@h324 Hours@h3Final 1 .... XXX .... XXX .... XXX 3 .... XXX .... XXX .... XXX 5 .... XXX .... XXX .... XXX 7 .... XXX .... XXX .... XXX 9 .... XXX .... XXX .... XXX 11 .... XXX .... XXX .... XXX 13 .... XXX .... XXX .... XXX 15 .... XXX .... XXX .... XXX 17 .... XXX .... XXX .... XXX 19 .... XXX .... XXX .... XXX 21 .... XXX .... XXX .... XXX 23 .... XXX .... XXX .... XXX 25 .... XXX .... XXX .... XXX Average xÿAE8 .... XXX .... XXX .... XXX Footnote: Overall (TABLE START)Percent Difference in Average xÿAE8 XXXXXXX (TABLE END) Water Penetration Test @h1 @h1Option A@h2End Leakage grams@h2Weight Gain grams @h1Option B@h2End Leakage grams@h2Penetration mm (in.) Control@rn,s_ Heat Age@rn,s_ Humidity Exposure@rn,s_ (TABLE START) Temperature Cycling@rn,s_ (TABLE END) Insulation Compression @h1 @h1Failures Control .... XXXXXXXX Heat Age .... XXXXXXXX Humidity Exposure .... XXXXXXXX Temperature Cycling .... XXXXXXXX (TABLE END) (TABLE START) Jacket Slip Strength @ 50«C @h1 @h1Load in newtons (pound-force) Control .... XXXXXXXX Heat Age .... XXXXXXXX Humidity Exposure .... XXXXXXXX (TABLE START) Temperature Cycling .... XXXXXXXX (TABLE END) Filler Exudation (grams) @h1 @h1 Heat Age .... XXXXXXXX Humidity Exposure .... XXXXXXXX (TABLE START) Temperature Cycle .... XXXXXXXX (TABLE END) Surge Test (kilovolts) @h1 @h1 Conductor to Conductor .... XXXXXXXX Shield to Conductors .... XXXXXXXX (TABLE END) [58 FR 29338, May 20, 1993; 58 FR 32749, June 11, 1993; as amended at 60 FR 1711, Jan. 5, 1995] _1755.397 RUS performance specification for line concentrators. (a) General. (1) This section covers general requirements for a line concentrator (LC) system. This system shall operate in accordance with the manufacturer's specifications. Reliability shall be of prime importance in the design, manufacture and installation of the equipment. The equipment shall automatically provide for: (i) Terminating subscriber lines at a location remote from the serving central office; (ii) Concentrating the subscriber lines over a few transmission and supervisory paths to the serving central office; and (iii) Terminating the lines at the central office without loss of individual identity. A subscriber connected to a line concentrator shall be capable of having essentially the same services as a subscriber connected directly to the central office equipment (COE). Intra-unit calling among subscribers connected to the concentrator may be provided, but is not required. (2) Industry standards, or portions thereof, referred to in this paragraph (a) are incorporated by reference by RUS. This incorporation by reference was approved by the Director of the Federal Register in accordance with 5 U.S.C. 552 (a) and 1 CFR part 51. Copies of these standards are available for inspection during normal business hours at RUS, room 2838, U.S. Department of Agriculture, Washington, DC 20250 or at the Office of the Federal Register, 800 North Capitol Street, NW., suite 700, Washington, DC. (3) American National Standards Institute (ANSI) standards are available from ANSI Inc., 11 West 42nd Street, 13th floor, New York, NY 10036, telephone 212 - 642 - 4900. (i) ANSI Standard S1.4 - 1983, Specification for Sound Level Meters, including Amendment S1.4A - 1985. (ii) [Reserved] (4) American Society for Testing Materials (ASTM) are available from 1916 Race Street, Philadelphia, PA 19103, telephone 215 - 299 - 5400. (i) ASTM Specification B33 - 91, Standard Specifications for Tinned Soft or Annealed Copper Wire for Electrical Purposes. (ii) [Reserved] (5) Bell Communications Research (Bellcore) standards are available from Bellcore Customer Service, 8 Corporate Place, Piscataway, NJ 08854, telephone 1 - 800 - 521 - 2673. (i) TR - TSY - 000008, Issue 2, August 1987, Digital Interface between the SLC 96 Digital Loop Carrier System and a Local Digital Switch. (ii) Bell Communications Research (Bellcore) document TR - TSY - 000057, Issue 1, April 1987, including Revision 1, November 1988, Functional Criteria for Digital Loop Carrier Systems. (iii) Bell Communications Research (Bellcore) Document TR - NWT - 000303, Issue 2, December 1992, including Revision 1, December 1993, Integrated Digital Loop Carrier System Generic Requirements, Objectives, and Interface. (6) Federal Standard H28, Screw-Thread Standards for Federal Services, March 31, 1978, including Change Notice 1, May 28, 1986; Change Notice 2, January 20, 1989; and Change Notice 3, March 12, 1990. Copies may be obtained from the General Services Administration, Specification Section, 490 East L'Enfant Plaza SW, Washington, DC 20407, telephone 202 - 755 - 0325. (7) IEEE standards are available from IEEE Service Center, 445 Hoes Lane, P.O. Box 1331, Piscataway, NJ 08854, telephone 1 - 800 - 521 - 2673. (i) IEEE Standard 455 - 1985, Standard Test Procedure for Measuring Longitudinal Balance of Telephone Equipment Operating in the Voice Band. (ii) [Reserved] (8) RUS standards are available from Publications and Directives Management Branch, Administrative Services Division, Rural Utilities Service, room 0180, South Building, U.S. Department of Agriculture, Washington, DC 20250 - 1500. (i) RUS Bulletin 345 - 50, PE - 60 (Sept 1979), RUS Specification for Trunk Carrier Systems. (ii) [Reserved] (b) Types of requirements. (1) Unless otherwise indicated, the requirements listed in this section are considered to be fixed requirements. (2) The concentrator system shall communicate with standard T1 digital transmission format at a minimum between the concentrator and central office terminals. Analog conversion functions at remote and central office terminals shall be capable of being eliminated to accommodate end-to-end digital transmission. (3) The LC shall operate properly as an integral part of the telephone network when connected to physical or carrier derived circuits and central offices meeting RUS specifications and other generally accepted telecommunications practices, such as Bellcore documents TR - NWT - 000303, Integrated Digital Loop Carrier System Generic Requirements, Objectives and Interface; TR - TSY - 000008, Digital Interface between the SLC 96 Digital Loop Carrier System and a Local Digital Switch; and TR - TSY - 000057, Functional Criteria for Digital Loop Carrier Systems. (4) For RUS acceptance consideration of a LC, the manufacturer must certify and demonstrate that all requirements specified in this section are available and in compliance with this section. (5) Certain requirements are included in this section for features which may not be needed for every application. Such features are identifiable by the inclusion in the requirements of some such phrase as ``when specified by the owner'' or ``as specified by the owner.'' In some cases where an optional feature will not be required by an owner, either now or in the future, a system which does not provide this feature shall be considered to be in compliance with the specification for the specific installation under consideration, but not in compliance with the entire specification. (6) The owner may properly request bids from any supplier of an RUS accepted LC whose system provides all the features which will be required for a specific installation. (7) When required by the owner, the supplier shall state compliance to the Carrier Serving Area (CSA) requirements, as stated in Bell Communications Research (Bellcore) Standard TR - TSY - 000057, Functional Criteria for Digital Loop Carrier Systems. (c) Reliability. (1) The failure rate of printed circuit boards shall not exceed an average of 2.0 percent per month of all equipped cards in all system terminals during the first 3 months after cutover, and shall not exceed an average of 1.0 percent per month of all equipped cards in all system terminals during the second 3-month period. The failure rate for the equipment shall be less than 0.5 percent per month of all equipped cards in all system terminals after 6 months. A failure is considered to be the failure of a component on the PC board which requires it to be repaired or replaced. (2) The line concentrator terminal units shall be designed such that there will be no more than 4 hours of total outages in 20 years. (d) System type acceptance tests. General test results will be required on each system type. Any system provided in accordance with this section shall be capable of meeting any requirement in this section on a spot-check basis. (e) Features required. The network control equipment and peripheral equipment shall be comprised of solid-state and integrated circuitry components as far as practical and in keeping with the state-of-the-art and economics of the subject system. (f) Subscriber lines -- (1) General. (i) The remote LC units shall operate satisfactorily with subscriber lines which meet all of the conditions under the bidder's specifications and all the requirements of this section. This section recognizes that the loop limit of the line concentrator is dependent upon the transmission facility between the LC central office termination and the LC remote unit. When voice frequency (physical) circuits are used, the loop limit from the COE to the subscriber shall be 1900 ohms (including the telephone set). When electronically derived circuits (carrier, lightwave, etc.) are used, the loop limits of the electronic system will control. The bidder shall identify the loop limits of the equipment to be supplied. (ii) There should be provisions for such types of lines as ground start, loop start, regular subscriber, pay stations, etc. (2) Dialing. (i) General. The line concentrator remote and central office terminal equipment shall satisfactorily transmit dialing information when used with subscriber dials having a speed of operation between 8 and 12 dial pulses per second and a break period of 55 to 65% of the total signaling period. (ii) Subscriber dial interdigital time. The remote and central office LC equipment shall permit satisfactory telecommunications operation when used with subscriber rotary dial interdigital times of 200 milliseconds minimum, and pushbutton dialing with 50 milliseconds minimum. (iii) Subscriber line pushbutton dialing frequencies. The frequency pairs assigned for pushbutton dialing when provided by the central office shall be as listed in this paragraph (f)(2)(iii), with an allowable (TABLE START)variation of ÿ1B1.5 percent: @h1Low group frequencies (Hz) @h1High group frequencies (Hz) @h21209 @h21336 @h21477 @h21633 697 .... 1 .... 2 .... 3 .... Spare. 770 .... 4 .... 5 .... 6 .... Spare. 852 .... 7 .... 8 .... 9 .... Spare. 941 .... * .... 0 .... # .... Spare. (TABLE END) (3) Ringing. (i) When LC ringing is generated at the remote end, it shall be automatic and intermittent and shall be cut off from the called line upon removal of the handset at the called station during either the ringing or silent period. (ii) When ringing generators are provided in the LC on an ancillary basis, they shall be accepted or technically accepted by RUS. (iii) Where ringing is generated at the remote end, the ringing system shall provide sufficient ringing on a bridged basis over the voltage and temperature limits of this specification and over subscriber loops within the limits stated by the manufacturer. The manufacturer shall state the minimum number (not less than two) of main station ringers that can be used for each ringing option available. (g) Traffic. (1)(i) The minimum grade of service for traffic in the line concentrator shall be B=.005 using the Traffic Table, based on the Erlang Lost-Calls-Cleared Formula. Required grade of service, traffic assumptions and calculations for the particular application being implemented shall be supplied by the bidder. (ii) Service to customers served by a traffic sensitive LC should not be noticeably different than the service to customers served by the dedicated physical pairs from the central office so that uniform grade of service will be provided to all customers in any class of service. Reference _1755.522(p)(1)(i), RUS General Specification for Digital, Stored Program Controlled Central Office Equipment. (2) Traffic and Plant Registers. Traffic measurements consist of three types -- peg count, usage, and congestion. A peg count register scores one count per call attempt per circuit group such as trunks, digit receivers, senders, etc. Usage counters measure the traffic density in networks, trunks and other circuit groups. Congestion registers score the number of calls which fail to find an idle circuit in a trunk group or to find an idle path through the switching network when attempting to connect two given end points. These conditions constitute ``network blocking.'' (3) When required, traffic data will be stored in electronic storage registers or a block of memory consisting of one or more traffic counters for each item to be measured. The bidder shall indicate what registers are to be supplied, their purpose and the means for displaying the information locally (or at a remote location when available). (h) Transmission requirements. (1) General. Unless otherwise stated, the requirements in paragraphs (h) (2) through (20) of this section are specified in terms of analog measurements made from Main Distributing Frame (MDF) terminals to MDF terminals excluding cabling loss. (2) Telephone transmitter battery supply. A minimum of 20 milliamperes, dc, shall be provided for the transmitter of the telephone set at the subscriber station under all loop conditions specified by the bidder. The telephone set is assumed to have a resistance of 200 ohms. (3) Impedance -- subscriber loops. For the purpose of this section, the input impedance of all subscriber loops served by the equipment is arbitrarily considered to be 900 ohms in series with 2.16 microfarad capacitor at voice frequencies. (4) Battery noise. Noise across the remote terminal battery at power panel distribution bus terminals shall not exceed 35 dBrnC during the specified busy hour. (5) Stability. The long-term allowable variation in loss through the line concentrator system shall be ÿ1B0.5 dB from the loss specified by the bidder. (6) Return loss. The specified return loss values are determined by the service and type of port at the measuring end. Two-wire ports are measured at 900 ohms in series with 2.16 microfarads, and 4-wire ports are measured at 600 ohms resistive. When other balance networks are supplied, test equipment arranged for operation with the supplied network(s) may be used. The requirement given shall meet the following cited values on each balance network available in the system: Line-to-Line or Line-to-Trunk (2 - Wire) Echo Return Loss (ERL) -- 18 dB, Minimum Singing Return Loss (SRL) -- Low -- 15 dB, Minimum Singing Return Loss (SRL) -- High -- 18 dB, Minimum (7) Longitudinal balance. The minimum longitudinal balance, with dc loop currents between 20 to 70 mA, shall be 60 dB at all frequencies between 60 and 2000 Hz, 55 dB at 2700 Hz and 50 dB at 3400 Hz. The method of measurement shall be as specified in the IEEE standard 455, ``Standard Testing Procedure for Measuring Longitudinal Balance of Telephone Equipment Operating in the Voice Band.'' Source voltage level shall be 10 volts root mean square (rms) where conversation battery feed originates at the remote end. (8) 60 hz longitudinal current immunity. The LC 60 Hz longitudinal current immunity shall be measured in accordance with Figure 1 of this section. Under test conditions cited on Figure 1 of this section, the system noise shall be 23 dBrnC or less as follows: E:\GRAPHICS\ER29AU95.002 (9) Steady noise (idle channel at 900 ohm impedance). Steady noise: Measure on terminated call. Noise measurements shall comply with the following: Maximum -- 23 dBrnC0 Average -- 18 dBrnC0 or Less 3KHz Flat -- Less than 35 dBrnO as an Objective (10) Impulse noise. LC central office terminal equipment shall have an impulse noise limit of not more than five counts exceeding 54 dBrnC0 voice band weighted in a 5-minute period on six such measurements made during the busy hour. A WILCOM T - 194C Transmission Test Set, or equivalent, should be used for the measurements. The measurement shall be made by establishing a normal connection from the noise counter through the switching equipment in its off-hook condition to a quiet termination of 900 ohms impedance. Office battery and signaling circuit wiring shall be suitably segregated from voice and carrier circuit wiring, and frame talking battery filters provided, if and as required, in order to meet these impulse noise limits. (11) Crosstalk coupling. Worst case equal level crosstalk shall be 65 dB minimum in the range 200 to 3400 Hz. This shall be measured between any two paths through the system by connecting a 0 dBm0 level tone to the disturbing pair. (12) Digital error rate. The digital line concentrator shall not introduce more than one error in 10\8\ bits averaged over a 5-minute period, excluding the least significant bit. (13) Quantizing distortion. (i) The system shall meet the (TABLE START)following requirements: @h1Input level (dBm0) 1004 or 1020 Hz @h1Minimum signal to distortion with C-message weighting 0 to 30 .... 33 dB 30 to 40 .... 27 dB 40 to 45 .... 22 dB (TABLE END) (ii) Due to possible loss of the least significant bit on direct digital connections, a signal to distortion degradation of up to 2 dB may be allowed where adequately justified by the bidder. (14) Overload level. The overload level shall be +3 dBm0. (15) Gain tracking (linearity) shall meet the following (TABLE START)requirements: @h1Input signal level\1\ @h1Maximum gain deviation +3 to 37 dBm0 .... ÿ1B0.5 dB 37 to 50 dBm0 .... ÿ1B1 dB Footnote: \1\1004 Hz reference at 0 dBm0. (TABLE END) (16) Frequency response (loss relative to 1004 Hz) for line-to-line (via trunk group or intra-link) connections shall meet the following (TABLE START)requirements: @h1Frequency (Hz) @h1Loss at 0 dBm0 input\1\ 60 .... 20 dB Min.\2\ 300 .... 1 to +3 dB 600 to 2400 .... +1 dB 3400 .... 1 to +3 dB Footnote: \1\() means less loss and (+) means more loss. Footnote: \2\Transmit End. (TABLE END) (17) Envelope delay distortion. On any properly established connection, the envelope delay distortion shall not exceed the following (TABLE START)limits: @h1Frequency (Hz) @h1Microseconds 1000 to 2600 .... 190 800 to 2800 .... 350 600 to 3000 .... 500 400 to 3200 .... 700 (TABLE END) (18) Absolute delay. The absolute one-way delay through the line concentrator, excluding delays associated with the central office switching equipment, shall not exceed 1000 microseconds analog-to-analog measured at 1800 Hz. (19) Insertion loss. The insertion loss in both directions of transmission at 1004 Hz shall be included in the insertion loss requirements for the connected COE switch and shall not increase the overall losses through the combined equipment beyond the values for the COE alone, when operated through a direct digital interface. Systems operated with a (VF) line circuit interface may introduce up to 3 dB insertion loss. Reference _1755.522(q)(3). (20) Detailed requirements for direct digital connections. (i) This paragraph (h)(20) covers the detailed requirements for the provision of interface units which will permit direct digital connection between the host central office and line concentrator subscriber terminals over digital facilities. The digital transmission system shall be compatible with T1 type span lines using a DS1 interface and other digital interfaces that may be specified by the owner. The RUS specification for the T1 span line equipment is PE - 60. Other span line techniques may also be used. Diverse span line routing may be used when specified by the owner. (ii) The output of a digital-to-digital port shall be Pulse Code Modulation (PCM), encoded in eight-bit words using the mu - 255 encoding law and D3 encoding format, and arranged to interface with a T1 span line. (iii) Signaling shall be by means of Multifrequency (MF) or Dual Pulsing (DP) and the system which is inherent in the A and B bits of the D3 format. In the case where A and B bits are not used for signaling or system control, these bits shall only be used for normal voice and data transmission. (iv) When a direct digital interface between the span line and the host central office equipment is to be implemented, the following requirements shall be met: (A) The span line shall be terminated in a central office as a minimum a DS1 (1.544Mb/s) shall be provided; (B) The digital central office equipment shall be programmed to support the operation of the digital port with the line concentrator subscriber terminal; (C) The line concentrator subscriber terminal used with a direct digital interface shall be interchangeable with the subscriber terminal used with a central office terminal. (i) Alarms. The system shall send alarms for such conditions as blown fuses, blocked controls, power failure in the remote terminal, etc., along with its own status indication and status of dry relay contact closures or solid-state equivalent to the associated central office alarm circuits. Sufficient system alarm points shall be provided from the remote terminal to report conditions to the central office alarm system. The alarms shall be transmitted from the remote terminal to the central office terminal as long as any part of the connecting link is available for this transmission. Fuses shall be of the alarm and indicator type, and their rating designated by numerals or color code on fuse positions. (j) Electrical protection -- (1) Surge protection. (i) Adequate electrical protection of line concentrator equipment shall be included in the design of the system. The characteristics and application of protection devices must be such that they enable the line concentrator equipment to withstand, without damage or excessive protector maintenance, the dielectric stresses and currents that are produced in line-to-ground and tip-to-ring circuits through the equipment as a result of induced or conducted lightning or power system fault-related surges. All wire terminals connected to outside plant wire or cable pairs shall be protected from voltage and current surges. (ii) Equipment must pass laboratory tests, simulating a hostile electrical environment, before being placed in the field for the purpose of obtaining field experience. For acceptance consideration RUS requires manufacturers to submit recently completed results (within 90 days of submittal) of data obtained from the prescribed testing. Manufacturers are expected to detail how data and tests were conducted. There are five basic types of laboratory tests which must be applied to exposed terminals in an effort to determine if the equipment will survive. Figure 2 of this section, Summary of Electrical Requirements and Tests, identifies the tests and their (TABLE START)application as follows: Figure 2. -- Summary of Electrical Requirements and Tests @h1Test @h1Application criteria @h1Peak voltage or current @h1Surge waveshape @h1Number of applications and maximum time between @h1Comments Current surge .... Low impedance paths exposed to surges .... 500A or lesser current (see fig. 4) .... 10ÿ0A1000 _s .... 5 each polarity at 1 minute intervals .... None. 60 Hz current carrying .... High or low impedance paths exposed to surges .... 10A rms or lesser current (see fig. 6) .... 11 Cycles of 60 Hz (0.183 Sec.) .... 3 each at 1 minute intervals .... None. AC Power service surge voltage .... AC power service connection .... 2500V or +3 s clamping V of arrester employed at 10kV/_s .... 1.2ÿ0A50 _s .... 5 each polarity at 1 minute intervals .... AC arrester, if used, must be removed. Communications line arresters, if used, remain in place. Voltage surge .... High impedance paths exposed to surges .... 1000V or +3 s dc breakdown of arrester employed .... 10ÿ0A1000 _s .... 5 each polarity at 1 minute intervals .... All primary arresters, if used, must be removed. Arrester response delay .... Paths protected by arresters, such as gas tubes, with breakdown dependent on V. rate of rise .... +3 s breakdown of arrester employed at 100V/_s of rise .... 100V/_s rise decay to \1/2\ V. in tube's delay time .... 5 each polarity at 1 minute intervals .... All primary arrestors, if used, must be removed. (TABLE END) (iii) Electrical protection requirements for line concentrator equipment can be summarized briefly as follows: (A) Current surge tests simulate the stress to which a relatively low impedance path may be subjected before main frame protectors break down. Paths with a 100 Hz impedance of 50 ohms or less shall be subjected to current surges, employing a 10 x 1000 microsecond waveshape as defined in Figure 3 of this section, Surge Waveshape. For the purpose of determining this impedance, arresters which are mounted within the equipment are to be considered zero impedance. The crest current shall not exceed 500A; however, depending on the impedance of the test specimen this value of current may be lower. The crest current through the sample, multiplied by the sample's 100 Hz impedance, shall not exceed 1000 V. Where sample impedance is less than 2 ohms, peak current shall be limited to 500A as shown in Figure 4 of this section, Current Surge Tests. Figures 3 and 4 follow: E:\GRAPHICS\ER29AU95.003 E:\GRAPHICS\ER29AU95.004 (B) Sixty Hertz (60 Hz) current carrying tests shall be applied to simulate an ac power fault which is conducted to the unit over the cable pairs. The test shall be limited to 10 amperes Root Mean Square (rms) of 60 Hz ac for a period of 11 cycles (0.1835 seconds) and shall be applied longitudinally from line to ground. (C) AC power service surge voltage tests shall be applied to the power input terminals of ac powered devices to simulate switching surges or lightning-induced transients on the ac power system. The test shall employ a 1.2 x 50 microsecond waveshape with a crest voltage of 2500 V. Communications line protectors may be left in place for these tests. (D) Voltage surge tests which simulate the voltage stress to which a relatively high impedance path may be subjected before primary protectors break down and protect the circuit. To ensure coordination with the primary protection while reducing testing to the minimum, voltage surge tests shall be conducted at a 1000 volts with primary arresters removed for devices protected by carbon blocks, or the +3 sigma dc breakdown voltage of other primary arresters. Surge waveshape should be 10 x 1000 microseconds. (E) Arrester response delay tests are designed to stress the equipment in a manner similar to that caused by the delayed breakdown of gap type arresters when subjected to rapidly rising voltages. Arresters shall be removed for these tests, the peak surge voltage shall be the +3 sigma breakdown voltage of the arrester in question on a voltage rising at 100 V per microsecond, and the time for the surge to decay to half voltage shall equal at least the delay time of the tube as explained in Figure 5 of this section, Arrester Response Delay Time as follows: E:\GRAPHICS\ER29AU95.005 (iv) Tests shall be conducted in the following sequence. As not all tests are required in every application, non-applicable tests should be omitted: (A) Current Impulse Test; (B) Sixty Hertz (60 Hz) Current Carrying Tests; (C) AC Power Service Impulse Voltage Test; (D) Voltage Impulse Test; and (E) Arrester Response Delay Time Test. (v) A minimum of five applications of each polarity for the surge tests and three for the 60 Hz Current Carrying Tests are the minimum required. All tests shall be conducted with not more than 1 minute between consecutive applications in each series of three or five applications to a specific configuration so that heating effects will be cumulative. See Figure 6 of this section, 60 Hz Current Surge Tests as follows: E:\GRAPHICS\ER29AU95.006 (vi) Tests shall be applied between each of the following terminal combinations for all line operating conditions: (A) Line tip to ring; (B) Line ring to ground; (C) Line tip to ground; and (D) Line tip and ring tied together to ground. (2) Dielectric strength. (i) Arresters shall be removed for all dielectric strength tests. (ii) Direct current potentials shall be applied between all line terminals and the equipment chassis and between these terminals and grounded equipment housings in all instances where the circuitry is dc open circuit from the chassis, or connected to the chassis through a capacitor. The duration of all dielectric strength tests shall be at least 1 second. The applied potential shall be at a minimum equal to the plus 3 sigma dc breakdown voltage of the arrester, provided by the line concentrator manufacturer. (3) Insulation resistance. Following the dielectric tests, the insulation resistance of the installed electrical circuits between wires and ground, with the normal equipment grounds removed, shall not be less than 10 megohms at 500 volts dc at a temperature of 68 _F (20 _C) and at a relative humidity of approximately 50 percent. The measurement shall be made after the meter stabilizes, unless the requirement is met sooner. Arresters shall be removed for these tests. (4) Self-protection. (i) All components shall be capable of being continuously energized at rated voltage without injury. Design precautions must be taken to prevent damage to other equipment components when a particular component fails. (ii) Printed circuit boards or similar equipment employing electronic components should be self-protecting against external grounds applied to the connector terminals. Board components and coatings applied to finished products shall be of such material or so treated that they will not support combustion. (iii) Every precaution shall be taken to protect electrostatically sensitive components from damage during handling. This shall include written instructions and recommendations. (k) Miscellaneous -- (1) Interconnect wire. All interconnect wire shall be of soft annealed tinned copper wire meeting the requirements of ASTM Specification B33 - 91 and of suitable cross-section to provide safe current carrying capacity and mechanical strength. The insulation of installed wire, connected to its equipment and frames, shall be capable of withstanding the same insulation resistance and dielectric strength requirements as given in paragraphs (j)(2) and (j)(3) of this section at a temperature of 120_F (49_C), and a relative humidity of 90 percent. (2) Wire wrapped terminals. These terminals are preferred and where used shall be of a material suitable for wire wrapping. The connections to them shall be made with a wire wrapping tool with the following minimum number of successive non-overlapping turns of bare tinned copper wire in contact with each terminal: (i) 6 turns of 30 gauge; (ii) 6 turns of 26 gauge; (iii) 6 turns of 24 gauge; or (iv) 5 turns of 22 gauge. (3) Protection against corrosion. All metal parts of equipment frames, distributing frames, cable supporting framework and other exposed metal parts shall be constructed of corrosion resistant materials or materials plated or painted to render them adequately corrosion resistant. (4) Screws and bolts. Screw threads for all threaded securing devices shall be of American National Standard form in accordance with Federal Standard H28, unless exceptions are granted to the manufacturer of the switching equipment. All bolts, nuts, screws, and washers shall be of nickel-copper alloy, steel, brass or bronze. (5) Environmental requirements. (i) The bidder shall specify the environmental conditions necessary for safe storage and satisfactory operation of the equipment being bid. If requested, the bidder shall assist the owner in planning how to provide the necessary environment for the equipment. (ii) To the extent practicable, the following temperature range objectives shall be met: (A) For equipment mounted in central office and subscriber buildings, the carrier equipment shall operate satisfactory within an ambient temperature range of 32 _F to 120 _F (0 _C to 49 _C) and at 80 percent relative humidity between 50 _F and 100 _F (10 _C and 38 _C); and (B) Equipment mounted outdoors in normal operation (with cabinet doors closed) shall operate satisfactorily within an ambient temperature range (external to cabinet) of 40 _F to 140 _F (40 _C to 60 _C) and at 95 percent relative humidity between 50 _F to 100 _F (10 _C to 38 _C). As an alternative to the (60 _C) requirement, a maximum ambient temperature of 120 _F (49 _C) with equipment (cabinet) exposed to direct sunlight may be substituted. (6) Stenciling. Equipment units and terminal jacks shall be adequately designated and numbered. They shall be stenciled so that identification of equipment units and leads for testing or traffic analysis can be made without unnecessary reference to prints or descriptive literature. (7) Quantity of equipment bays. Consistent with system arrangements and ease of maintenance, space shall be provided on the floor plan for an orderly layout of future equipment bays. Readily accessible terminals will be provided for connection to interbay and frame cables to future bays. All cables, interbay and intrabay (excluding power), if technically feasible, shall be terminated at both ends by connectors. (8) Radio and television interference. Measures shall be employed by the bidders to limit the radiation of radio frequencies generated by the equipment so as not to interfere with radio, television receivers, or other sensitive equipment. (9) Housing. (i) When housed in a building supplied by the owner, a complete floor plan including ceiling height, floor loading, power outlets, cable entrances, equipment entry and travel, type of construction, and other pertinent information shall be supplied. (ii) In order to limit corrosion, all metal parts of the housing and mounting frames shall be constructed of suitable corrosion resistant materials or materials protectively coated to render them adequately resistant to corrosion under the climatic and atmospheric conditions existing in the area in which the housing is to be installed. (10) Distributing frame. (i) The line concentrator terminal equipment located at the central office shall be protected by the central office main distribution frame. The bidder may supply additional protection capability as appropriate. All protection devices (new or existing) shall be arranged to operate in a coordinated manner to protect equipment, limit surge currents, and protect personnel. (ii) The distributing frame shall provide terminals for terminating all incoming cable pairs. Arresters shall be provided for all incoming cable pairs, or for a smaller number of pairs if specified. (iii) The current carrying capacity of each arrester and its associated mounting shall coordinate with a #22 gauge copper conductor without causing a self-sustaining fire or permanently damaging other arrester positions. Where all cable pairs entering the housing are #24 gauge or finer, the arresters and mountings need only coordinate with #24 gauge cable conductors. (iv) Remote terminal protectors may be mounted and arranged so that outside cable pairs may be terminated on the left or bottom side of protectors (when facing the vertical side of the MDF) or on the back surface of the protectors. Means for easy identification of pairs shall be provided. (v) Protectors shall have a ``dead front'' (either insulated or grounded) where live metal parts are not readily accessible. (vi) Protectors shall be provided with an accessible terminal of each incoming conductor which is suitable for the attachment of a temporary test lead. They shall also be constructed so that auxiliary test fixtures may be applied to open and test the subscriber's circuit in either direction. Terminals shall be suitable for wire wrapped connections or connectorized. (vii) If specified, each protector group shall be furnished with a factory assembled tip cable for splicing to the outside cable; the tip cable shall be 20 feet (6.1 m) in length, unless otherwise specified. Tip cable used shall be RUS accepted. (viii) Protector makes and types used shall be RUS accepted. (l) Power equipment -- (1) General. When specified, batteries and charging equipment shall be supplied for the remote terminal of the line concentrator. (2) Operating voltage. (i) The nominal operating voltage of the central office and remote terminal shall be 48 volts dc, provided by a battery with the positive side tied to system ground. (ii) Where equipment is dc powered, it must operate satisfactorily over a range of 50 volts ÿ1B 6 volts dc. (iii) Where equipment is ac powered, it must operate satisfactorily over a range of 120ÿ1B10 volts or 220ÿ1B10 volts ac. (3) Batteries. (i) Unless otherwise specified by the owner, sealed batteries shall be supplied for the remote line concentrator terminal. (ii) The batteries shall have an ampere hour load capacity of no less than 8 busy hours. When an emergency ac supply source is available, the battery reserve may be reduced to 3 busy hours. (iii) The batteries shall be sealed when they are mounted in the cabinet with the concentrator equipment. (iv) When specified by the owner, battery heaters shall be supplied in a bidder-furnished housing. (4) Charging equipment. (i) One charger capable of carrying the full dc power load of the remote terminal shall be supplied unless otherwise specified by the owner. (ii) Charging shall be on a full float basis. The rectifiers shall be of the full wave, self-regulating, constant voltage, solid-state type and shall be capable of being turned on and off manually. (iii) When charging batteries, the voltage at the battery terminals shall be adjustable and shall be set at the value recommended for the particular battery being charged, provided it is not above the maximum operating voltage of the central office switching equipment. The voltage shall not vary more than ÿ1B0.02 volt dc per cell between 10% load and 100% load. Between 3% and 10% load, the output voltage shall not vary more than ÿ1B0.04 volt dc per cell. Beyond full load current the output voltage shall drop sharply. The above output voltage shall be maintained with input line voltage variations of plus or minus 10 percent. Provision shall be made to manually change the output voltage of the rectifier to 2.25 volts per cell to provide an equalization charge on the battery. (iv) The charger noise, when measured with a suitable noise measuring set and under the rated battery capacitance and load conditions, shall not exceed 22 dBrnC. See Figure 7 of this section, Charger Noise Test as follows: E:\GRAPHICS\ER29AU95.007 (v) The charging equipment shall be provided with a means for indicating a failure of charging current whether due to ac power failure, an internal failure in the charger, or to other circumstances which might cause the output voltage of the charger to drop below the battery voltage. Where a supplementary constant current charger is used, an alarm shall be provided to indicate a failure of the charger. (vi) Audible noise developed by the charging equipment shall be kept to a minimum. Acoustic noise resulting from operation of the rectifier shall be expressed in terms of dB indicated on a sound level meter conforming to American National Standards Institute S1.4, and shall not exceed 65 dB (A-weighting) measured at any point 5 feet (1.5m) from any vertical surface of the rectifier. (vii) The charging equipment shall be designed so that neither the charger nor the central office equipment is subject to damage in case the battery circuit is opened for any value of load within the normal limits. (5) Power panel. (i) Battery and charger control switches, dc voltmeters, dc ammeters, fuses and circuit breakers, supervisory and timer circuits shall be provided as required. Portable or panel mounted frequency meters or voltmeters shall be provided as specified by the owner. (ii) Power panels, cabinets and shelves, and associated wiring shall be designed initially to handle the line concentrator terminal when it reaches its ultimate capacity as specified by the owner. (iii) The power panel shall be of the ``dead front'' type. (6) Ringing equipment. The ringing system shall provide sufficient ringing on a bridged basis over the voltage and temperature limits of this section and over subscriber drops within the limits stated by the bidder. The ringing system shall be without operational problems such as bell tapping during dialing. The bidder shall state the minimum number (not less than two) of main station ringers that can be used for each ringing option available. (7) Interrupter equipment. The interrupter may be an integral part of the system or may be part of the associated central office equipment connected to the line concentrator central office terminal. (8) Special systems. Manufacturers of LC systems that operate by extending ringing current from the central office shall state their required input ringing (voltage and frequency) and the limitations on the connected subscriber loop. (m) Fusing requirements -- (1) General. (i) The equipment shall be completely wired and equipped with fuses, trouble signals, and all associated equipment for the wire capacity of the frames or cabinets provided. (ii) Design precautions shall be taken to prevent the possibility of equipment damage arising from the insertion of an electronic package into the wrong connector or the removal of a package from any connector or improper insertion of the correct card in its connector. (2) Fuses. Fuses and circuit breakers shall be of an alarm and indicator type, except where the fuse or breaker location is indicated on the alarm printout. Their rating shall be designated by numerals or color codes on the fuse or the panel. (n) Trouble location and test -- (1) Equipment. (i) Trouble indications in the system may be displayed in the form of lights on the equipment units or printed circuit boards. (ii) When required, a jack or other connector shall be provided to connect a fault or trouble recorder (printer or display). (2) Maintenance system. (i) The maintenance system shall monitor and maintain the system operation without interruption of call processing except for major failures. (ii) The maintenance system shall be arranged to provide the ability to determine trouble to an individual card, functional group of cards, or other equipment unit. (o) Spare parts. Lists of spare parts and maintenance tools as recommended by the bidder shall be provided. The cost of such tools and spare parts shall be indicated and shall not be included in the base price. (p) Drawings and printed material. (1) The bidder shall supply instructional material for each line concentrator system involved at the time of delivery of the equipment. It is not the intent of this section to require system documentation necessary for the repair of individual circuit boards. (2) Three complete sets of legible drawings shall be provided for each central office to be accessed. Each set shall include all of the following: (i) Drawings of major equipment items such as frames, with the location of major component items of equipment shown therein; (ii) Wiring diagrams indicating the specific method of wiring used on each item of equipment and interconnection wiring between items of equipment; (iii) Maintenace drawings covering each equipment item that contains replaceable parts, appropriately identifying each part by name and part number; and (iv) Job drawings including all drawings that are individual to the particular line concentrator involved such as mainframe, power equipment, etc. (3) The following information shall also be furnished: (i) A complete index of required drawings; (ii) An explanation of electrical principles of operation of overall concentrator system; (iii) A list of tests which can be made with each piece of test equipment furnished and an explanation of the method of making each test; (iv) A sample of each form recommended for use in keeping records; (v) The criteria for analyzing results of tests and determining appropriate corrective action; (vi) A set of general notes on methods of isolating equipment faults to specific printed circuit cards in the equipment; (vii) A list of typical troubles which might be encountered, together with general indications as to probable location of each trouble; and (viii) All special line concentrator system grounding requirements. (4) When installation is to be done by the bidder a complete set of drawings shall be provided by the owner, such as floor plans, lighting, grounding and ac power access. (q) Installation and acceptance -- (1) General. Paragraphs (q)(2)(i) through (q)(3)(xxi) of this section covers the general requirements for the installation of line concentrator equipment by the bidder, and outlines the general conditions to be met by the owner in connection with such installation work. The responsibilities apply in both the central office installation and remote terminal installations, unless otherwise noted. (2) Responsibilities of owner. The owner shall: (i) Allow the bidder and its employees free access to the premises and facilities at all hours during the progress of the installation; (ii) Provide access to the remote site and any other site for development work needed during the installation; (iii) Take such action as necessary to ensure that the premises are dry and free from dust and in such condition as not to be hazardous to the installation personnel or the material to be installed (not required when remote terminal is not installed in a building); (iv) Provide heat or air conditioning when required and general illumination in rooms in which work is to be performed or materials stored; (v) Provide suitable openings in buildings to allow material to be placed in position (not required when a remote terminal is not installed in a building); (vi) Provide the necessary conduit and commercial and dc-ac inverter output power to the locations shown on the approved floor plan drawings; (vii) Provide 110 volts a.c., 60 Hz commercial power equipped with a secondary arrester and a reasonable number of outlets for test, maintenance and installation equipment; (viii) Provide suitable openings or channels and ducts for cables and conductors from floor to floor and from room to room; (ix) Provide suitable ground leads, as designated by the bidder (not required when remote terminal is not installed in a building); (x) Provide the necessary wiring, central office ground and commercial power service, with a secondary arrester, to the location of an exterior remote terminal installation based on the voltage and load requirements furnished voltage and load requirements furnished by the bidder; (xi) Test at the owners expense all lines and trunks for continuity, leakage and loop resistance and ensure that all lines and trunks are suitable for operation with the central office and remote terminal equipment specified; (xii) Make alterations and repairs to buildings necessary for proper installation of material, except to repair damage for which the bidder or its employees are responsible; (xiii) Connect outside cable pairs on the distributing frame (those connected to protectors); (xiv) Furnish all line, class of service assignment, and party line assignment information to permit bidder to program the data base memory within a reasonable time prior to final testing; (xv) Release for the bidder's use, as soon as possible, such portions of the existing plant as are necessary for the proper completion of such tests as require coordination with existing facilities including facilities for T1 span lines with properly installed repeaters between the central office and the remote terminal installations; (xvi) Make prompt inspections as it deems necessary when notified by the bidder that the equipment, or any part thereof, is ready for acceptance; (xvii) Provide adequate fire protection apparatus at the remote terminal, including one or more fire extinguishers or fire extinguishing systems of the gaseous type, that has low toxicity and effect on equipment; (xviii) Provide necessary access ports for cable, if underfloor cabling is selected; (xix) Install equipment and accessory plant devices mounted external to the central office building and external to the repeater and other outside housings including filters, repeater housings, splicing of repeater cable stubs, externally mounted protective devices and other such accessory devices in accordance with written instructions provided by the bidder; and (xx) Make all cross connections (at the MDF or Intermediate Distribution Frame IDF) between the physical trunk or carrier equipment and the central office equipment unless otherwise specified in appendix A of this section. (3) Responsibilities of bidder. The bidder shall: (i) Allow the owner and its representatives access to all parts of the building at all times; (ii) Obtain the owner's permission before proceeding with any work necessitating cutting into or through any part of the building structure such as girders, beams, concrete or tile floors, partitions or ceilings (does not apply to the installation of lag screws, expansion bolts, and similar devices used for fastening equipment to floors, columns, walls, and ceilings); (iii) Be responsible for and repair all damage to the building due to carelessness of the bidder's workforce, exercise reasonable care to avoid any damage to the owner's switching equipment or other property, and report to the owner any damage to the building which may exist or may occur during its occupancy of the building; (iv) Consult with the owner before cutting into or through any part of the building structure in all cases where the fireproofing or moisture proofing may be impaired; (v) Take necessary steps to ensure that all fire fighting apparatus is accessible at all times and all flammable materials are kept in suitable places outside the building; (vi) Not use gasoline, benzene, alcohol, naphtha, carbon tetrachloride or turpentine for cleaning any part of the equipment; (vii) Be responsible for delivering the CO and remote terminal equipment to the sites where they will be needed; (viii) Install the equipment in accordance with the specifications for the line concentrator; (ix) Have all leads brought out to terminal blocks on the MDF (or IDF if stated in appendix A of this section) and have all terminal blocks identified and permanently labeled; (x) Use separate shielded type leads grounded at one end only unless otherwise specified by the owner or bidder or tip cables meeting RUS cable crosstalk requirements for carrier frequencies inside the central office; (xi) Group the cables to separate carrier frequency, voice frequency, signaling, and power leads; (xii) Make the necessary power and ground connections (location as shown in appendix A of this section) to the purchaser's power terminals and ground bus unless otherwise stated in appendix A of this section (ground wire shall be 6 AWG unless otherwise stated); (xiii) Place the battery in service in compliance with the recommendations of the battery manufacturer; (xiv) Make final charger adjustments using the manufacturer's recommended procedure; (xv) Run all jumpers, except line and trunk jumpers (those connected to protectors) unless otherwise specified in appendix A of this section; (xvi) Establish and update all data base memories with subscriber information as supplied by the owner until an agreed turnover time; (xvii) Give the owner notice of completion of the installation at least one week prior to completion; (xviii) Permit the owner or its representative to conduct tests and inspections after installation has been completed in order that the owner may be assured the requirements for installation are met; (xix) Allow access, before turnover, by the owner or its representative, upon request, to the test equipment which is to be turned over as a part of the delivered equipment, to permit the checking of the circuit features which are being tested and to permit the checking of the amount of connected equipment to which the test circuits have access; (xx) Notify the owner promptly of the completion of work of the central office terminals, remote terminals or such portions thereof as are ready for inspection; and (xxi) Correct promptly all defects for which the bidder is responsible. (4) Information to be furnished by bidder. The bidder shall accompany its bid with the following information: (i) Two copies of the equipment list and the traffic calculations from which the quantities in the equipment list are determined; (ii) Two copies of the traffic tables from which the quantities are determined, if other than the Erlang B traffic tables; (iii) A block diagram of the line concentrator and associated maintenance equipment will be provided; (iv) A prescribed method and criteria for acceptance of the completed line concentrator which will be subject to review; (v) This special grounding requirements including the recommended configuration, suggested equipment and installation methods to be used to accomplish them; (vi) The special handling and equipment requirements to avoid damage resulting from the discharge of static electricity (see paragraph (j) (4) (iii) of this section) or mechanical damage during transit installation and testing; (vii) The location of technical assistance service, its availability and conditions for owner use and charges for the service by the bidder; and (viii) The identification of the subscriber loop limits available beyond the line concentrator. (5) Installation requirements. (i) All work shall be done in a neat, workmanlike manner. Equipment frames or cabinets shall be correctly located, carefully aligned, anchored, and firmly braced. Cables shall be carefully laid with sufficient radius of curvature and protected at corners and bends to ensure against damage from handling or vibration. Exterior cabinet installations for remote terminals shall be made in a permanent, eye-pleasing manner. (ii) All multiple and associated wiring shall be continuous, free from crosses, reverses, and grounds and shall be correctly wired at all points. (iii) An inspection shall be made by the owner or its representatives prior to performing operational and performance tests on the equipment, but after all installing operations which might disturb apparatus adjustments have been completed. The inspection shall be of such character and extent as to disclose with reasonable certainty any unsatisfactory condition of apparatus or equipment. During these inspections, or inspections for apparatus adjustments, or wire connections, or in testing of equipment, a sufficiently detailed examination shall be made throughout the portion of the equipment within which such condition is observed, or is likely to occur, to disclose the full extent of its existence, where any of the following conditions are observed: (A) Apparatus or equipment units failing to compare in quantity and type to that specified for the installation; (B) Apparatus or equipment units damaged or incomplete; (C) Apparatus or equipment affected by rust, corrosion or marred finish; and (D) Other adverse conditions resulting from failure to meet generally accepted standards of good workmanship. (6) Operational tests. (i) Operational tests shall be performed on all circuits and circuit components to ensure their proper functioning in accordance with appropriate explanation of the operation of the circuit. (ii) All equipment shall be tested to ensure proper operation with all components connected in all possible combinations and each line shall be tested for proper ring, ring trip and supervision. (iii) All fuses shall be verified for continuity and correct rating. Alarm indication shall be demonstrated for each equipped fuse position. An already failed fuse compatible with the fuse position may be used. (iv) Each alarm or signal circuit shall be checked for correct operation. (v) A sufficient quantity of locally originating and incoming calls shall be made to demonstrate the function of the line concentrator including all equipped transmission paths. When intra-link calling is supplied, all intra-link transmission paths shall be demonstrated. (7) Acceptance tests and data required. (i) Data shall be supplied to the owner by the bidder in writing as a part of the final documents in closing out the contract as follows: (A) A detailed cross connect drawing of alarm to power board, central office battery to physical trunks or carrier system, wiring options used in terminals, channels, filters, repeaters, etc., marked in the owner's copy of the equipment manual or supplied separately; (B) The measured central office supply voltages applied to the equipment terminals or repeaters at the time the jack and test point readings are made and ac supply voltages where equipment is powered from commercial ac sources; (C) A list of all instruments, including accessories, by manufacturer and type number, used to obtain the data; and (D) The measurements at all jack or test points recommended by the manufacturer, including carrier frequency level measurements at all carrier terminals and repeaters where utilized. (ii) Data in the form of a checklist or other notations shall be supplied showing the results of the operational tests. (iii) The bidder shall furnish to the owner a record of the battery cell or multicell unit voltages measured at the completion of the installation of the switching system before it is placed in commercial service. This is not required at a site where the owner furnishes dc power. (8) Joint inspection requirements. (i) The bidder shall notify the owner in writing at least one week before the date the complete system will be ready for inspection and tests. A joint inspection shall be made by the bidder and the owner (or owner's engineer) to determine that the equipment installation is acceptable. The inspection shall include physical inspection, a review of acceptance test data, operational tests, and sample measurements. (A) The owner shall review the acceptance test data and compare it to the requirements of this section. (B) Sample measurements shall be made on all systems installed under this contract. Test methods should follow procedures described in paragraph (g)(5) of this section. (C) A check shall be made of measured test point and jack readings for compliance with the manufacturer's specifications. This applies also to channels, terminals, carrier frequency repeaters, and fault locating circuits. (ii) In the event that the measured data or operational tests show that equipment fails to meet the requirements of this section, the deficiencies are to be resolved as set forth in Article II of the 397 Special Equipment Contract. (Copies are available from RUS, room 0174, U.S. Department of Agriculture, Washington, DC 20250 - 1500.) The reports of the bidder and the owner shall be detailed as to deficiencies, causes, corrective action necessary, corrective action to be taken, completion time, etc. (The information and recordkeeping requirements of this section have been approved by the Office of Management and Budget (OMB) under the control number 0572 - 0059.) Appendix A to _1755.397 -- Specification for Line Concentrator Detailed Equipment Requirements (Information To Be Supplied by Owner) Telephone Company (Owner) Name: Location: Number of LC's Required: XXXX (TABLE START) Line Concentrator Locations: @h1Location @h1No. of Lines @h1Central Office .... .... .... .... .... .... .... .... (TABLE END) 1. General 1.1 Notwithstanding the bidder's equipment lists, the equipment and materials furnished by the bidder must meet the requirements of paragraphs (a) through (p) of this section, and this appendix A. 1.2 Paragraph (a) through (p) of this section cover the minimum general requirements for line concentrator equipment. 1.3 Paragraph (q) of this section covers the requirements for installation, inspection and testing when such service is included as part of the contract. 1.4 This appendix A covers the technical data for application engineering and detailed equipment requirements insofar as they can be established by the owner. This appendix A shall be filled in by the owner. 1.5 Appendix B of this section covers detailed information on the line concentrator equipment, information on system reliability and traffic capacity as proposed by the bidder. Appendix B of this section is to be filled in by the bidder and must be presented with the bid. Office Name (By Location) LC Designation (TABLE START) 2. Number of Subscriber Lines @h1 @h1Equipped @h1Wired only Single-Party .... .... Pay Station (Type:XXXX) .... .... Other (Describe:XXXX) .... .... Total .... .... (TABLE END) 3. Loop Resistance 3.1 Number of non-pay station lines having a loop resistance, including the telephone set as follows: 3.1.1 For physical trunks between the remote and the office units, (TABLE START)the loop resistance is to include the resistance of the trunk. @h1 @h1No. of lines 1200 - 1900 ohms .... 1901 - 3200 ohms .... 3201 - 4500 ohms .... (TABLE END) 3.1.2 Number of pay station lines having a loop resistance, (TABLE START)excluding the telephone set, greater than: @h1 @h1No. of lines 1200 ohms (Prepay) .... 1000 ohms (Semi-Postpay) .... (TABLE END) When physical trunks are used, these resistances include that of the facility between the CO and the remote. 3.1.3 Range extension equipment, if required, is to be provided: XXXX By Bidder XXXX By Owner (Quantity and Type) _ 4. Traffic Data 4.1 Average combined originating and terminating hundred call seconds (CCS) per line in the busy hour: XXX CCS/Line. (Assume originating & terminating equal.) 4.2 Percent Intra-Calling XXXX 4.3 Total Busy Hour Calls XXXX (TABLE START) 5. TYPE or RINGING @h15.1 Frequency No. @h11. @h12. @h13. @h14. Frequency (Hz) .... .... .... .... Max. No. of Phones/Freq. .... .... .... .... (TABLE END) 5.2 Minimum ringing generator capacity to be supplied shall be sufficient to serve XXXX lines (each frequency). 6. Central Office Equipment Interface 6.1 COE will be: 6.1.1 COE Manufacturer _ Type Year Generic 6.1.2 XXXX See digital central office specification for the switchboard at XXXXXXXXXX . 6.2 Interface will be: 6.2.1 XXXX Line Circuit(s) 6.2.2 XXXX Direct Digital Interface 6.2.3 XXXX Other (Describe) _ _ 6.3 Mounting rack for line concentrator furnished by: XXXX Bidder XXXX Owner (Specify width and height of rack available) (Width) (Height) 6.4 Equipment to be installed in existing building: XXXX Yes (Attach detailed plan) XXXX No 7. Transmission Facilities 7.1 Transmission facilities between the central office and remote terminals shall be: 7.1.1 Type: XXXXVF Carrier Derived Circuits XXXXDigital Span Line (DS1) XXXXOther _ (Attach a layout of the transmission facilities between the central office and the remote terminals describing transmission and signaling parameters, routing and resistance where applicable.) 7.1.2 Utilizes physical plant XXXXCable Pairs (Existing/New) XXXXOther _ Note: Unless otherwise stated, physical plant will be supplied by the owner. 7.1.3 Terminal equipment for transmission facility to be supplied by: XXXXOwner XXXXBidder 7.1.3.1 Carrier e/w voice terminations XXXX Yes XXXX No Manufacturer and type Central office voice terminations Equipped XXXX, Wired Only XXXX 7.1.3.2 Digital span line (DS1) supplied by XXXXOwner XXXXBidder Manufacturer and Type 7.1.3.3 Number of repeaters (per span line) XXXX 7.1.3.4 Diverse (alternate) span line routing required XXXXYes (Describe in Item 11) XXXXNo 7.1.3.5 Span line terminations only XXXXYes XXXXNo 7.1.3.6 Span line power required (CO and Remote Terminals) XXXXYes XXXXNo 7.1.3.7 Physical facility between CO and remote Loop Resistance XXXXohms, Length XXXXmeters 8. Power Equipment Requirements 8.1 Central Office Terminal 8.1.1 Owner-furnished 48 volt dc power XXXXYes XXXXNo 8.1.2 Other (Describe) _ 8.1.3 Standby power is available XXXXYes XXXXNo 8.2 Remote Terminal 8.2.1 Owner-furnished 48 vdc power XXXXYes XXXXNo 8.2.2 Bidder-furnished power supply XXXXYes XXXXNo 8.2.3 AC power available at site: XXXX110 vac, 60 Hz, single-phase XXXXOther (Describe in Item 11) 8.2.4 A battery reserve of XXXX busy hours shall be provided for this line concentrator terminal when it reaches XXXX lines at the traffic rates specified. 8.2.5 Batteries supplied shall be: XXXXLead Calcium XXXXStabilized Electrolyte XXXXSealed Lead Acid XXXXOther (Describe in item 11) 8.2.6 Standby power is available XXXXYes XXXXNo 9. Remote Terminal 9.1 Mounting 9.1.1 XXXXOutside Housing (To be furnished by bidder) 9.1.2 XXXXConcrete Slab to be furnished by owner (Bidder to supply construction details after award.) 9.1.3 XXXXManhole, environmentally controlled (Describe in Item 11) 9.1.4 XXXXPedestal Mounting 9.1.5 XXXXPole Mounting (Owner-furnished installed pole) 9.1.6 XXXXPrefab Building (Owner-furnished site) 9.2 Equipment is to be installed in an existing building. XXXXYes XXXXNo (Attach detailed plan.) 9.3 Other (Describe) _ _ 10. Alternates 11. Explanatory Notes Appendix B to _1755.397 -- Specification for Line Concentrators Detailed Requirements; Bidder Supplied Information Telephone Company (Owner) Name: Location: Line Concentrator Equipment Locations Central Office Terminal: Remote Terminal: 1. General 1.1 The equipment and materials furnished by the bidder must meet the requirements of paragraphs (a) through (p) of this section. 1.2 Paragraph (a) through (p) of this section cover the minimum general requirements for line concentrator equipment. 1.3 Paragraph (q) of this section covers requirements for installation, inspection and testing when such service is included as part of the contract. 1.4 Appendix A of this section covers the technical data for application engineering and detailed equipment requirements insofar as they can be established by the owner. Appendix A of this section is to be filled in by the owner. 1.5 This appendix B covers detailed information on the line concentrator equipment, information as to system reliability and traffic capacity as proposed by the bidder. This appendix B shall be filled in by the bidder and must be presented with the bid. 2. Performance Objectives 2.1 Reliability (See paragraph (c) of this section) _ _ _ _ 2.2 Busy Hour Load Capacity and Traffic Delay (See Paragraph (g) of this section) _ _ _ 3. Equipment Quantities Dependent on System Design 3.1 Transmission Facilities between the Central Office and Remote (TABLE START)Terminals @h1Type @h1Quantity equipped @h1Quantity wired only .... .... .... .... .... .... (TABLE END) 4. Power Requirements 4.1 Central Office Terminal Voltage Current Drain (Amps) Normal XXXX, Peak XXXX Fuse Qty XXXX, Size XXXX, Type XXXX Heat Dissipation (BTU/Hr.) XXXX _ 4.2 Remote Terminal AC or DC Voltage Current Drain (Amps) Normal XXXX, Peak XXXX Fuse Qty XXXX, Size XXXX, Type XXXX Heat Dissipation (BTU/Hr.) XXXX _ Power required for heating or cooling equipment in remote bidder-furnished housing _ _ 5. Temperature and Humidity Limitations (TABLE START) 5.1 Temperature @h1 @h1Central office @h1Remote* Maximum _F (_C) .... .... Minimum _F (_C) .... .... (TABLE END) (TABLE START) 5.2 Relative Humidity @h1 @h1Central office @h1Remote* Maximum .... .... Minimum .... .... Footnote: *Show conditions outside bidder-furnished housing. (TABLE END) 6. Explanatory Notes [60 FR 44729, Aug. 29, 1995] __1755.398 -- 1755.521 [Reserved] _1755.522 RUS general specification for digital, stored program controlled central office equipment. (a) General. (1) This section covers general requirements for a digital telephone central office switching system, which is fully electronic and controlled by stored program processors. A digital switching system transfers information which is digitally encoded from any input port to a temporarily addressed exit port. The information may enter the system in either analog or digital form and may or may not be converted to analog at the exit port depending on the facility beyond. The switching system shall operate properly as an integral part of the telephone network when connected to physical and carrier derived circuits meeting RUS specifications and other generally accepted telecommunications practices. (2) The output of a digital-to-digital port shall be Pulse Code Modulation (PCM), encoded in eight-bit words using the mu-255 encoding law and D3 encoding format, and arranged to interface with a T1 span line. (3) American National Standards Institute (ANSI) Standard S1.4 - 1983, Specification for Sound Level Meters, is incorporated by reference by RUS. This includes S1.4A-1985 that is also incorporated by reference. This incorporation by reference was approved by the Director of the Federal Register in accordance with 5 U.S.C. 552(a) and 1 CFR part 51. Copies may be obtained from ANSI Inc., 11 West 42nd Street, 13th Floor, New York, NY 10036, telephone 212 - 642 - 4900. Copies may be inspected during normal business hours at RUS, room 2838-S, U.S. Department of Agriculture, Washington, DC 20250 or at the Office of the Federal Register, 800 North Capitol Street, NW., suite 700, Washington, DC. (4) American Society for Testing Materials (ASTM) Specification B 33 - 91, Standard Specification for Tinned Soft or Annealed Copper Wire for Electrical Purposes, is incorporated by reference by RUS. This incorporation by reference was approved by the Director of the Federal Register in accordance with 5 U.S.C. 552(a) and 1 CFR part 51. Copies may be obtained from ASTM, 1916 Race Street, Philadelphia, PA, telephone 215 - 299 - 5400. Copies may be inspected during normal business hours at RUS, room 2838-S, U.S. Department of Agriculture, Washington, DC 20250 or at the Office of the Federal Register, 800 North Capitol Street, NW., suite 700, Washington, DC. (5) Bell Communications Research (Bellcore) document SR-TSV-002275, BOC Notes on the LEC Networks -- 1990, March 1991, is incorporated by reference by RUS. This incorporation by reference was approved by the Director of the Federal Register in accordance with 5 U.S.C. 552(a) and 1 CFR Part 51. Copies may be obtained from Bellcore Customer Service, 60 New England Avenue, Piscataway, NJ 08854, telephone 1 - 800 - 521 - 2673. Copies may be inspected during normal business hours at RUS, room 2838-S, U.S. Department of Agriculture, Washington, DC 20250 or at the Office of the Federal Register, 800 North Capitol Street, NW., suite 700, Washington, DC. (6) Bellcore TR-TSY-000508, Automatic Message Accounting, July 1987, is incorporated by reference by RUS. This incorporation by reference was approved by the Director of the Federal Register in accordance with 5 U.S.C. 552(a) and 1 CFR part 51. Copies may be obtained from Bellcore Customer Service, 60 New England Avenue, Piscataway, NJ 08854, telephone 1 - 800 - 521 - 2673. Copies may be inspected during normal business hours at RUS, room 2838-S, U.S. Department of Agriculture, Washington, DC 20250 or at the Office of the Federal Register, 800 North Capitol Street, NW., suite 700, Washington, DC. (7) Federal Standard H28, Screw-Thread Standards for Federal Services, March 31, 1978, is incorporated by reference by RUS. This includes: Change Notice 1, Federal Standard, Screw-Thread Standards for Federal Services, May 28, 1986; Change Notice 2, Federal Standard, Screw-Thread Standards for Federal Services, January 20, 1989; and Change Notice 3, Federal Standard, Screw-Thread Standards for Federal Services, March 12, 1990. This incorporation by reference was approved by the Director of the Federal Register in accordance with 5 U.S.C. 552(a) and 1 CFR part 51. Copies may be obtained from the General Services Administration, Specification Section, 490 East L'Enfant Plaza SW, Washington, DC 20407, telephone 202 - 755 - 0325. Copies may be inspected during normal business hours at RUS, room 2838-S, U.S. Department of Agriculture, Washington, DC 20250 or at the Office of the Federal Register, 800 North Capitol Street, NW., suite 700, Washington, DC. (8) Institute of Electrical and Electronics Engineers (IEEE) Std 455 - 1985, IEEE Standard Test Procedure for Measuring Longitudinal Balance of Telephone Equipment Operating in the Voice Band, is incorporated by reference by RUS. This incorporation by reference was approved by the Director of the Federal Register in accordance with 5 U.S.C. 552(a) and 1 CFR part 51. Copies may be obtained from IEEE Service Center, 445 Hoes Lane, P. O. Box 1331, Piscataway, NJ 08854, telephone (201) 981 - 0060. Copies may be inspected during normal business hours at RUS, room 2838-S, U.S. Department of Agriculture, Washington, DC 20250 or at the Office of the Federal Register, 800 North Capitol Street, NW., suite 700, Washington, DC. (9) Institute of Electrical and Electronics Engineers (IEEE) Std 730 - 1989, IEEE Standard for Software Quality Assurance Plans, is incorporated by reference by RUS. This incorporation by reference was approved by the Director of the Federal Register in accordance with 5 U.S.C. 552(a) and 1 CFR part 51. Copies may be obtained from IEEE Service Center, 445 Hoes Lane, P. O. Box 1331, Piscataway, NJ 08854, telephone (201) 981 - 0060. Copies may be inspected during normal business hours at RUS, room 2838-S, U.S. Department of Agriculture, Washington, DC 20250 or at the Office of the Federal Register, 800 North Capitol Street, NW., suite 700, Washington, DC. (10) RUS Bulletin 345 - 50, PE-60, RUS Specification for Trunk Carrier Systems, September 1979, is incorporated by reference by RUS. This incorporation by reference was approved by the Director of the Federal Register in accordance with 5 U.S.C. 552 (a) and 1 CFR part 51. Copies may be obtained from the Rural Utilities Service, Administrative Services Division, room 0175-S, Washington, DC 20250. The bulletin may be inspected at the Office of the Federal Register, 800 North Capitol Street, NW., suite 700, Washington, DC. (11) RUS Bulletin 345 - 55, PE-61, Central Office Loop Extenders and Loop Extender Voice Frequency Repeater Combinations, December 1973, is incorporated by reference by RUS. This incorporation by reference was approved by the Director of the Federal Register in accordance with 5 U.S.C. 552 (a) and 1 CFR part 51. Copies may be obtained from the Rural Utilities Service, Administrative Services Division, room 0175-S, Washington, DC 20250. The bulletin may be inspected at the Office of the Federal Register, 800 North Capitol Street, NW., suite 700, Washington, DC. (12) RUS Bulletin 345 - 87, PE-87, RUS Specification for Terminating (TIP) Cable, December 1983, is incorporated by reference RUS. This incorporation by reference was approved by the Director of the Federal Register in accordance with 5 U.S.C. 552 (a) and 1 CFR part 51. Copies may be obtained from the Rural Utilities Service, Administrative Services Division, room 0175-S, Washington, DC 20250. The bulletin may be inspected at the Office of the Federal Register, 800 North Capitol Street, NW., suite 700, Washington, DC. (b) Reliability. (1) Quality control and burn-in procedures shall be sufficient so the failure rate of printed circuit boards does not exceed an average of 1.0 percent per month of all equipped cards in the central office during the first three months after cutover, and an average of 0.5 percent per month of all equipped cards in the central office during any 6-month period thereafter. A failure is considered to be the failure of a component on the PC board which requires it to be repaired or replaced. (2) The central office switching system shall be designed such that the expected individual line downtime does not exceed 30 minutes per year. This is the interval that the customer is out of service as a result of all failure types, excluding dispatch and travel time, i.e., hardware, software, and procedural errors. (3) The central office switching system shall be designed such that there will be no more than 1 hour of total outages in 20 years, excluding dispatch and travel time for unattended offices. (c) System type acceptance tests. (1) System type acceptance tests (general acceptance tests) are performed for the purpose of determining whether or not a type of switching system should be added or retained as an RUS accepted system. While general acceptance tests will be required on each system type, they will not be expected to cover every requirement in this section. However, any installation of a system provided in accordance with this section shall be capable of meeting any requirement in this section on a spot-check basis. (2) A ``completed call'' test shall be made part of these system type acceptance tests. There shall be no more than two in 10,000 locally originating and incoming calls misdirected, unsuccessfully terminated, prematurely disconnected or otherwise failing as a result of equipment malfunction and/or equipment failures, or as a result of transients, noise or design deficiencies. This test shall be made with a load box with no less than 10 lines access and 10 subscriber numbers for completion, or equivalent, with no other traffic in the system. If there is a failure in the equipment during this test, the cause shall be repaired and the test restarted at zero calls. (3) System type acceptance testing applies basically to factory type testing, and not to owner acceptance testing for individual installations. The overall installed and operating system shall also meet these requirements, except for unusual circumstances or where specifically excluded by this or other RUS requirements. (d) Types of requirements. (1) Unless otherwise indicated, the requirements listed in this section are fixed requirements. (2) Optional requirements are those which may not be needed for every office and are identifiable by a phrase such as, ``when specified by the owner,'' or, ``as specified by the owner.'' (3) In some cases where an optional feature specified in paragraph (e) of this section will not be required by an owner, either now or in the future, a system which does not provide this feature will be considered to be in compliance with this section for the specific installation under consideration, but not in compliance with the entire section. (4) The owner may request bids from any RUS accepted supplier whose system provides all the features which will be required for a specific installation. (5) The Application Guide, RUS TE&CM 322, provides information about the economic and service factors involved in all optional features, as well as instructions for the completion of appendices A and B of this section. (e) General requirements. (1) The equipment shall provide for terminating and automatically interconnecting subscriber lines and trunks in response to dial pulses (or pushbutton dialing signals, if specified) without the aid of an operator. (2) Complete flexibility shall be provided for assigning any subscriber directory number to any central office line equipment by the use of internal programmed memory. Thus, any subscriber line and/or directory number may be moved to another terminal to distribute traffic loads, if the line equipment hardware is compatible with the service provided. (3) The system shall be arranged to interface with interexchange carrier trunks and networks using single digit or multi-digit access codes. The system shall be equipped to handle at least 20-digit subscriber dialed numbers. All subscriber directory numbers in the office shall be seven-digit numbers. (4) The network and the control equipment shall be comprised of solid-state and integrated circuitry components. Peripheral equipment shall be comprised of solid-state and integrated circuitry components as far as practical and consistent with the state-of-the-art and economics of the subject system. (5) The basic switching system shall include the provision of software programming and necessary hardware, including memory, for optional custom calling services such as call waiting, call forwarding, three-way calling, and abbreviated dialing. It shall be possible to provide these services to any individual line (single-party) subscriber. The addition of these services shall not reduce the anticipated ultimate engineered line, trunk, and traffic capacity of the switching system as specified in appendix A of this section. (6) The requirements in this specification apply only to single party lines. Although only single frequency ringing is required, other types may be requested in appendix A of this section. (7) Provision shall be made for local automatic message accounting (LAMA), and for traffic service position system (TSPS) trunks, or equivalent, to the operator's office when required either initially or in the future. (8) Tandem switching features shall be provided if specified in appendix A of this section. (9) The system shall be arranged to serve a minimum of eight All Number Calling (ANC) office codes per office, with discrimination on terminating calls by trunk group, numbering plan, or programmed memory and class mark, if specified in appendix A of this section. (10) Busy hour load handling capacity is an important feature when an office approaches capacity. The delays which may occur in call completion during busy hour periods may prove to be excessive in some system designs. Accordingly, each bidder shall provide, in appendix C of this section, data satisfactory to RUS regarding the busy hour load handling capacity and traffic delays of the system. (11) Provision shall be made for hotel-motel arrangements, as required by the owner, to permit the operation of message registers at the subscriber's premises to record local outdial calls by guests (see Item 10.5, appendix A of this section). (12) Provision shall be made to identify the calling line or incoming trunk on nuisance calls (see paragraph (g)(10) of this section for details). (13) Full access from every subscriber line to every interoffice trunk shall be provided. (14) Facilities shall be provided to implement service orders, make traffic studies, and perform switching and transmission tests by means of remote control devices if such operations are specified in Items 11.2 and 11.3 of appendix A of this section. (15) Provision shall be made for the addition of facilities to record all subscriber originated calls based on dialed directory number, time of day, and duration of conversation. They shall be such that the additional equipment (if any is required) may be added to an in-service system without interruption of service and a minimum of equipment, wiring and software modifications. (16) The system shall be capable of distributed switching operation where groups of subscriber lines can be remotely located from the central office. The remotely situated units are known as ``Remote Switching Terminals'' (RST's) (see paragraph (w) of this section). This does not eliminate the use of pair gain devices such as direct digitally connected concentrators, regular concentrators or subscriber carrier equipment, where specifically ordered by the owner and its engineer. (17) The switching system shall have means to synchronize its clock with switches above it in the network hierarchy, when specified by the owner in item 3, appendix A of this section (see paragraph (j) of this section). (18) Consistent with system arrangements and ease of maintenance, space shall be provided on the floor plan for an orderly layout of future equipment bays that will be required for anticipated traffic when the office reaches its ultimate size. Readily accessible terminals shall be provided for connection to interbay and frame cables to future bays. All cables, interbay and intrabay (excluding power), if technically feasible, shall be terminated at both ends by use of connectors. (19) When specified in appendix A of this section, the system shall be capable of processing emergency calls to a 911 service bureau connected either by a group of one-way 911 lines or a trunk group. (i) It shall be possible to reach the service bureau by dialing 911, 1+911, or a 7-digit number. (ii) The system shall select an idle 911 line or trunk. (iii) The system shall provide usual ringing and ringback signal until the called 911 line answers. (iv) If the calling line goes on-hook first, the system shall hold the connection from the called 911 line and return steady low tone to the service bureau. The system shall then begin a 45-minute timeout, after which the calling line is disconnected and an alarm message is printed on a TTY. If the calling line goes off-hook before timeout, the system shall reestablish the conversation path. (v) If the calling line does not disconnect, the service bureau attendant shall have the ability to force a disconnect of the established connection with the calling party. (vi) When the 911 call is answered, the equipment shall be arranged so that coin lines are not charged for the call. Similarly, if some form of local call charging is used, there shall be no charge for the 911 call. (vii) If the 911 service bureau is holding a calling line, it shall be possible for the 911 line to cause the equipment to ring back the calling line. This is done by providing a flash of on-hook signal from the 911 line lasting from 200 to 1,100 milliseconds. The signal to the calling line shall be ringing current if the line is on-hook, or receiver off-hook (ROH) tone if the line is off-hook. (viii) Calls shall not be originated from the service bureau via the dedicated 911 lines. If an attempt is made to originate a call, it shall receive reorder tone. After 6 minutes, the system shall print an alarm message. (ix) If 911 calls pass through intermediate switching, the forced-hold control, emergency ringback, and calling line status monitoring capabilities are lost. (f) Line circuit requirements -- (1) General. (i) The range of direct current (dc) resistances of subscriber loops, measured from the main frame in the central office and including the telephone set shall be at least 0 - 1900 ohms without loop extension and 1900 - 3600 ohms with loop extenders, or equivalent. The range when using extension equipment may be significantly reduced for straight line ringers. These limits apply under maximum adverse environmental and manufacturing variation tolerance conditions. Central office voltage shall be stabilized at a value necessary to provide at least a nominal 21 milliamperes current with a nontreated loop of at least 1900 ohms. Minimum loop insulation resistance without loop extenders shall be 25,000 ohms between conductors or from either conductor or both conductors in parallel to ground. Loop insulation resistance for loop extension devices may be 100,000 ohms minimum between conductors or from either conductor or both conductors in parallel to ground. (ii) Subscribers on the same party line shall have the ability to call each other. Requirements for revertive call operation are provided in paragraph (g)(8) of this section. (iii) In addition to operating on nonloaded cable pairs and subscriber carrier, the equipment shall function properly with D-66 and H-88 loaded cable pairs, including any provisions the equipment must control for the purposes of proper transmission. (2) Dialing -- (i) Subscriber dial speed. The line equipment and central office equipment (COE) in tandem shall operate satisfactorily when used with subscriber dials having a speed of operation between eight and twelve impulses per second and a break period of 55 to 65 percent of the total impulse period. (ii) Subscriber dial interdigital time. The line equipment and central office equipment shall operate satisfactorily with subscriber rotary dial interdigital times of 200 milliseconds minimum, and with pushbutton dialing interdigital times of 50 milliseconds minimum. (iii) Subscriber line pushbutton dialing frequencies. (A) The frequency pairs assigned for pushbutton dialing shall be as follows, with (TABLE START)an allowable variation of ÿ1B 1.5 percent: @h1Low Group Frequencies (Hz) @h1High Group Frequencies (Hz)@h21209@h21336@h21477@h21633 697 .... 1 .... 2 .... 3 .... Spare 770 .... 4 .... 5 .... 6 .... Spare 852 .... 7 .... 8 .... 9 .... Spare 941 .... * .... 0 .... ÿ1B .... Spare (TABLE END) (B) The receiver shall comply with the operating parameters of the dual-tone multifrequency (DTMF) central office receiver as described in section 6 of Bell Communications Research (Bellcore) document SR-TSV-002275, BOC Notes on the LEC Networks -- 1990. (3) Impedance. For the purpose of this section, the input impedance of all subscriber loops served by the equipment is arbitrarily considered to be 900 ohms at voice frequencies. (4) Lockout. (i) All line circuits shall be arranged for line lockout. When a permanent condition occurs prior to placing a line into lockout, a timed low level warning followed by a timed high level receiver off-hook (ROH) tone (see paragraph (i)(2)(xi) of this section) or a howler circuit (see paragraph (o)(2)(iii)(C) of this section) shall be applied to the line. (ii) The line on lockout shall be reconnected automatically to the central office when the permanent off-hook condition is cleared. (5) Pay stations. Pay stations may be prepay, or semi-postpay, as specified by the owner. (6) Loop extension. (i) The number of lines which exceed 1900 ohms will be specified by the owner. When requested by the owner, the bidder shall furnish equipment to guarantee satisfactory operation of all lines. (ii) Working limits for subscriber lines with loop extenders are covered in RUS Bulletin 345 - 55, PE-61, Central Office Loop Extenders and Loop Extender Voice Frequency Repeater Combinations. (iii) Ringing from RUS accepted loop extenders, or their equivalent, shall be cut off from the called line when the handset at the called station is removed during the ringing or the silent interval. (7) Private branch exchange (PBX) lines. PBX trunk hunting shall be available. It will not be necessary to segregate PBX lines to certain line groups. (8) Quantity. A sufficient number of terminations shall be provided, in addition to the quantity specified by the owner for subscriber line service, to meet the requirements of the system for equipment testing, alarm checking, tone transfer, loop around test and other features. (9) Types. There shall be provisions for types of lines such as ground start, loop start, regular subscriber, pay stations, etc. (g) Intraoffice switching requirements. (1) The switching system shall: (i) Provide dial tone in response to origination of a call by a subscriber, except on special lines where the application of dial tone is not applicable, such as manual and hot lines; (ii) Remove dial tone immediately after the first digit has been dialed; (iii) Recognize the class of service of the calling subscriber; (iv) Register the digits dialed by the calling subscriber where the rotary dial or pushbutton dialing characteristics and the minimum interdigital times are as specified; (v) Perform the necessary translation functions when the required number of digits have been registered, and select a channel to a proper outgoing trunk, if one is available, to the designated interexchange carrier; (vi) Provide a transmission path from the calling subscriber line to the selected trunk, if an idle one is found; (vii) Provide for more than one alternate route to the desired destination when specified by the owner, select an idle outgoing trunk in the first or second choice alternate route trunk group, if all trunks in the higher choice groups are busy, and provide a reorder signal (see paragraph (i)(2)(iv) of this section) to the subscriber if no trunks are available in the last choice alternate route; (viii) Translate the proper part of the registered incoming routing data on tandem calls into an identification of an outgoing trunk group, select an idle trunk in that group, initiate the connection of the incoming trunk to the outgoing trunk, set the trunks in the proper configuration for tandem operation, and transmit information as required to permit completion to the desired destination in the distant office; (ix) Transmit the proper stored information over the selected trunk to permit completion of outgoing calls to the desired destination by the distant office or offices, and provide multifrequency (MF) outpulsing when specified; (x) Register all the digital information on calls incoming from a distant office, when dial or MF pulsing characteristics and interdigital times are as specified; (xi) Translate internally a registered directory number into line equipment location, ringing code and terminating class (such as ``PBX hunting'') on incoming or intraoffice calls; (xii) Test the called line for a busy condition; (xiii) Connect the incoming trunk or locally originated call to the called line if the called line is idle; (xiv) Permit any type of ringing voltage available in the central office to be associated with any Subscriber Directory Number (SDN), cause the proper type of ringing voltage to be connected to the called line, and remove ringing from the line upon answer whether in the ringing or silent period; and (xv) Test and monitor the switching system continually during periods of low traffic using the maintenance and diagnostic subsystem. (2) The switching system shall offer at least the following originating and terminating class-of-service indications on a per-line basis to subscribers, as specified by the owner: (i) Flat rate individual line, bridged ringing; (ii) Flat rate two-party, full selective ringing; (iii) Flat rate four-party, full selective ringing; (iv) Flat rate PBX and trunk hunting numbers, bridged ringing; (v) Pay station; (vi) Message rate subscriber line; (vii) Wide Area Telephone Service (WATS); (viii) Extended Area Service (EAS); (ix) Data service; (x) Hotel-Motel capability; (xi) Denied originating; (xii) Denied terminating; (xiii) Custom calling features; (xiv) Special interexchange carrier accesses; and (xv) Presubscription to designated interexchange carrier. (3) The switching system shall provide PBX hunting. (i) At least one trunk hunting group in each 100 SDN's equipped shall be provided. More may be provided as specified by the owner. (ii) PBX groups shall be of a reasonable size commensurate with the ultimate size of the switching system. (iii) Any available SDN may be used for PBX trunk hunting. (iv) Each PBX group shall have the capability of being assigned one or more nonhunting SDN's for night service. (v) If the called line is a PBX hunting line, the switching system shall test all assigned lines in the hunting group for a busy condition. (vi) If the called PBX group is busy, line busy tone, as specified in paragraph (i)(2)(iii) of this section, shall be returned to the originating end of the connection. (4) The switching system shall provide pay stations which may be prepay or semi-postpay. The system shall be arranged so that an operator and emergency service (911) may be reached from prepay or semi-postpay coin lines without the use of a coin, when the proper pay station equipment is provided. (5) To meet dialing requirements, the switching system shall: (i) Initiate the line lockout function after a delay, as specified in paragraph (r)(3) of this section, if dial or pushbutton dialing pulses are not received after initiation of a call, preferably routing the subscriber line to a holding circuit for tones and then automatically to lockout; (ii) Connect 120 interruptions per minute (IPM) paths busy tone, recorded message, or other distinctive tone to the calling subscriber if an interval longer than that specified in paragraph (r)(4) of this section elapses between dialed digits; (iii) Register the standard tone calling signals received from a subscriber station arranged for pushbutton dialing if specified by the owner, provide arrangements to function properly with 12-button pushbutton dialing sets, and return a reorder signal to the subscriber upon receipt of signal from the 11th or 12th buttons if neither of these buttons is assigned functions; and (iv) Connect the incoming trunk to the digit register equipment within 120 milliseconds after seizure where direct dialing is received on calls from a distant office, cancel the bid for a register, and return reorder tone to the calling end if dial pulses are received before a register is attached. (6) The switching system shall provide for appropriate circuit usage. (i) To avoid inefficient utilization of the switching network, that portion of the common equipment that establishes the connection on intramachine calls shall not require more than 500 milliseconds, exclusive of ringing and ring trip, to complete its function under no-delay conditions. (ii) The switching system shall provide for duplication in a load sharing or redundant configuration any circuit elements or components, the failure of which would reduce the grade of service of 100 or more lines by more than 25 percent of the traffic carrying capacity. (iii) The switching system shall ensure that failure of access to a high choice circuit will not prevent subsequent calls from being served by lower choice circuits, wherever possible. (iv) Where only two circuits of a type are provided, circuits shall be designed so that failure of one circuit will not permanently block any portion of the system for the duration of the failure. (v) Where more than two circuits of a type are provided, successive usages should be on a rotational or random basis rather than the step-up selection with the possible exception of a last choice trunk. (vi) The system shall be designed so that, in the event of a network failure, the system shall immediately or simultaneously use a redundant portion of the network to complete the call. (7) The switching system shall provide busy verification facilities with the method of access specified by the owner. (i) Only an operator or a switchman shall be able to override a busy line condition. (ii) If the called line is busy, off-hook supervision shall be given the operator or switchman. (iii) The responsibility of restricting subscribers in distant offices from having access to busy verification shall be on the distant office personnel when the toll trunks are used for both toll connecting and verification traffic. (iv) When a verification code is used, all digits of the code must be dialed before cut-through to the called line can be accomplished. (8) The switching system shall provide revertive call by directory number to permit subscribers on the same party line to call each other. (i) A ``don't answer'' disconnect feature shall be provided, which shall operate after an elapsed timing interval as specified in paragraph (r)(6) of this section. (ii) The equipment shall be designed to provide a recorded announcement to the calling party when they dial a party on the same line and provide an announcement or a distinctive tone as specified by the owner, in appendix A of this section, to the called party when the called party answers. (9) The switching system shall provide intercept facilities. (i) All unused numbering plan area codes, home numbering plan area office codes, service codes and subscriber directory numbers (SDN's) shall be routed to intercept. All intercept administration shall be by changes in memory administrable by telephone company personnel. Maximum machine time to place a subscriber on intercept shall be 15 seconds. (ii) Unequipped SDN's intercept shall be effective if the processor memory does not have information concerning the SDN in question. (iii) The intercept equipment shall be arranged so that specific SDN's can be routed to a separate intercept circuit for changed numbers. (iv) When an intercept call is answered, either by an operator or by a recorded announcement, an off-hook or charge supervision signal shall not be returned, even momentarily, to the originating end. (v) When intercepting service is to be handled over the regular interoffice toll trunks, a distinctive identifying tone shall be transmitted when the operator answers. This tone shall be of the frequency and duration specified in paragraph (i)(2)(x) of this section. (10) The switching system shall provide nuisance call trap facilities which, when activated, provide a permanent record of the calling and called numbers complete with date and time of day. Where the call originates over an interoffice trunk, the actual trunk number shall be recorded. There shall be provision for the called subscriber to hold the connection and for the positive trace of the call from origination to termination within the office. (11) The switching system shall follow appropriate release procedures. (i) The office shall be arranged so a connection to a terminating channel other than assistance operator shall be released under control of the calling party so that the channel can be reseized, unless the call is to emergency 911 service or other termination arranged for called party control. (ii) If the called party disconnects first, the channel used in the originally established connection shall be held until the calling party disconnects or until the timing interval specified in paragraph (r)(7) of this section has elapsed. This feature shall not interfere with the normal operation of calls to intercept, fire alarm, or other special services. (12) The switching system shall provide line load control facilities, when specified by the owner, to give preference for originating service to a limited group of subscribers during emergencies. (i) These facilities may be activated manually by input-output (I/O) device or automatically after a manual setting of a key (or equivalent) to put line load control into effect, as determined by the bidder. The automatic procedure is preferable. (ii) Procedures shall be established to avoid the unauthorized use of the line load control facilities. (iii) Where automatic activation is provided, service may be provided to small groups of nonemergency subscribers on limited grade of service whenever the office load becomes low enough to permit this to be done safely. (h) Interoffice trunk circuit requirements -- (1) General. (i) The bidder shall supply, as requested by the owner, solid-state technology type trunk and signaling circuits of any of the types described in RUS TE&CM 319, Interoffice Trunking and Signaling, or, with the approval of RUS, any other more recent and desirable types not as yet covered in the manual. For dc signaling, the duplex (DX) and loop types of signaling are preferred. (ii) Trunks shall not be directly driven from the subscriber's dial on outward calls. (iii) In order to reduce the spares inventory and minimize incidence of improper maintenance replacement of circuit assemblies, the types of trunk circuits shall be kept to a minimum. Variation in assemblies should be mainly limited to variation in signaling modes. (iv) Trunk circuits which connect with carrier or 4-wire transmission facilities shall be arranged for 4-wire transmission to avoid an intermediate 2-wire interface between a 4-wire switching system and trunk facilities. (2) Quantity. Trunk quantities shall be as specified in appendix A of this section. Sufficient space shall be provided for an orderly layout of trunks. Trunks of a certain type going to the same destination may be grouped together on the original installation. (3) Requirements for interoffice connections. (i) When operator trunks are used in common for both coin and noncoin lines, they shall be arranged to provide an indication to the operator by means of a visual signal or tone when calls are from pay stations. When a tone is used, it shall be of the type specified in paragraph (i)(2)(v) of this section and shall be connected to be heard only by the operator upon answer. It shall be possible to repeat the tone signal. (ii) There are no requirements for trunks arranged for manual re-ring by a toll operator, either with the receiver on or off the hook, except to coin stations with the receiver on the hook. (iii) On calls from subscribers to the assistance operator, the release of the connection shall be under control of the last party to disconnect. An exception is operator control of disconnect that is used on outgoing trunks to a TSP/TSPS system. (iv) On calls originated by an operator, the release of the connection shall be under control of the operator. (v) Where trunks with E and M lead signaling are used, the trunk circuits for Type I signaling shall be arranged to place ground on the M lead during the on-hook condition and battery on the M lead in the off-hook condition. For E and M Type II, only a make contact between the MA and MB lead will be required. In either type, current limiting shall be provided in the E lead of the trunk circuit itself, as required for proper operation. It shall be assumed that connection equipment in the form of trunk carrier, multiplex, or associated signaling apparatus furnishes only a contact closure to ground (Type I) or to a signal ground lead (Type II) for an off-hook condition on the E lead. (vi) Where answer supervision is used to determine the initiation of the charging interval for a call, such answer supervision shall not be effective for charging until after the elapse of the timing interval listed in paragraph (r)(5) of this section. (vii) When necessary, provision shall be made for reception of start and stop dial signals on toll trunk equipment. (viii) When trunks arranged for automatic message accounting (AMA), toll ticketing, or centralized automatic message accounting (CAMA) are specified by the owner, these trunks shall provide the pertinent features described in paragraph (k) of this section applicable to such functions. (4) Requirements for direct digital connections. (i) Interface units which will permit direct digital connection to other digital switches, channel banks and remote line and/or trunk circuits over digital facilities shall be provided when specified by the owner. The digital transmission system shall be compatible with T1 type span lines using a DS1 interface and other digital interfaces that may be specified by the owner. The RUS specification for the span line equipment is Bulletin 345 - 50, PE-60, RUS Specification for Trunk Carrier Systems. (ii) Each interface circuit shall connect 24 voice channels to the switching system from a 1.544 megabit per second DS1 bit stream. The DS1 bit stream entering or exiting the system shall be in the D3 format and the voice signals shall be encoded in 8 bit mu-255 PCM. The format and processing of the bit stream must be compatible with characteristics of the D3 channel bank such as alarm and maintenance characteristics. Loss of receive signal (DS1) shall be detected and the equivalent of a carrier group alarm shall be executed in 2.5 ÿ1B 0.5 seconds. Loss of synchronization shall be detected by slips, timing jitter, and wander in accordance with industry standards. (iii) Signaling shall be by means of MF or dial pulse (DP) and the system which is inherent in the A and B bits of the D3 format. In the case where they are not used for signaling, the A and B bits shall be used only for normal voice and data transmission. (i) Tone requirements -- (1) General. Tones shall be provided to indicate the progress of a call through the office. Tone generators should be an integral part of the switching systems. The tones should be introduced digitally by the application of the appropriate bit stream to the line or trunk circuit via the digital switching network. The necessary precautions shall be made to ensure tone sources automatically if the primary sources fail. (2) Tone specifications. (i) Dial tone shall consist of 350 Hz plus 440 Hz at a composite level of 10 dBm0 which equates to 13 dBm0 per frequency. This is the precise tone suitable for use with pushbutton dialing. (ii) Low tone shall consist of 480 Hz plus 620 Hz at a composite level of 21 dBm0 which equates to 24 dBm0 per frequency. (iii) Line busy tone shall be low tone interrupted at 60 IPM, with tone on 0.5 seconds and off 0.5 seconds. (iv) Reorder, all paths busy, and no circuit tone shall be low tone interrupted at 120 IPM, with tone on 0.25 seconds and off 0.25 seconds. (v) Identifying tone on calls from coin lines shall be uninterrupted low tone. (vi) High tone shall consist of 480 Hz at 17 dBm0. (vii) Audible ringback tone shall consist of 440 plus 480 Hz at a composite level of 16 dBm0 which equates to 19 dBm0 per frequency. (viii) The call progress tones listed in this section are described in Bellcore document SR-TSV-002275, BOC Notes on the LEC Networks -- 1990, section 6. The 350, 440, 480, and 620 Hz tones shall be held at ÿ1B 0.5 percent frequency tolerance and ÿ1B 3 dB amplitude variation. The amplitude levels specified are to be measured at the main distributing frame, excluding cable loss. (ix) Distinctive tone, when required for alarm calls, or other features, shall consist of high tone interrupted at 200 IPM with tone on 150 ms and off 150 ms. (x) Identifying tone on intercepted calls shall consist of uninterrupted high tone impressed on the trunk circuit 300 to 600 milliseconds following the operator's answer of intercepted calls. (xi) An ROH circuit shall have output tones which do not interfere with the pushbutton or multifrequency signaling tones. The ROH tone may be introduced digitally internal to the system near the overload level of +3 dBm0. No power adjustment will be required. The frequency of the output shall be distinctive and urgent in order to attract the subscriber's attention to an off-hook situation. (Warning: In order to determine the signal level, a frequency selective voltmeter must be used to determine the level of each signal component and mathematical power addition used to combine these measurements into a single level value.) (xii) During application of tones, office longitudinal balance shall be maintained within 15 dB of that specified in paragraph (q)(8) of this section. (j) System clock. (1) The central office clock and network synchronization system shall have the ability to be synchronized with external clocks for network synchronization, including detection of slips, timing, jitter and wander, in a digital-to-digital environment or operate initially in an independent network (refer to Bellcore document SR-TSV-002275, BOC Notes on the LEC Networks -- 1990, section 11). (2) The end office central office system clock shall be a Stratum 3 clock with: (i) A minimum long-term accuracy of ÿ1B4.6 ÿ0A 106 (ÿ1B7 Hz @ 1.544 MHz); (ii) A minimum stability of 3.7 ÿ0A 107/day upon loss of all frequency references; and (iii) A ``Pull-In Range'' for the capability of synchronizing to a clock with accuracy of ÿ1B4.6 ÿ0A 10 6. (3) The access tandem central office system clock shall be a Stratum 2 clock with: (i) A minimum long-term accuracy of ÿ1B1.6 ÿ0A 108 (ÿ1B0.025 Hz @ 1.544 MHz); (ii) A minimum stability of 1 ÿ0A 1010/day upon loss of all frequency references; and (iii) A ``Pull-In Range'' for the capability of synchronization to a clock with accuracy of ÿ1B1.6 ÿ0A 108. (k) Switched access service arrangements -- (1) General. The equipment shall be capable of providing Feature Group A, Feature Group B, Feature Group C, and Feature Group D switched access service arrangements, as described in Bellcore document SR-TSV-002275, BOC Notes on the LEC Networks -- 1990, section 6 and section 15, including arrangements for automatic number identification (ANI). (2) Operation. (i) All equipment shall be arranged for Feature Group A (Line Side Connection). (ii) All equipment shall be arranged for Feature Group B given that appendix A of this section requires the equipment of the necessary trunks (Trunk Side Connection). (iii) The equipment shall be arranged for Feature Group C on the trunk groups specified in appendix A of this section. Even though appendix A of this section specifies Feature Group D or some other trunk group, it shall be possible through software commands available to the owner to use Feature Group C signaling protocols on a trunk group basis until such time that the trunk group in question converts to Feature Group D signaling protocols. (iv) The equipment shall be arranged for Feature Group D on the trunk groups specified in appendix A of this section. (v) Calls originating from coin lines toward switched access service shall be arranged either to provide signaling protocols for TSPS, or in the absence of TSPS-type service, such calls shall be blocked. (vi) The equipment shall be arranged for forwarding routing information, calling party identification, and called party numbers in the proper feature group protocols, by trunk group as specified in appendix A of this section. (vii) The equipment shall be arranged for AMA data collection as specified in appendix A of this section by trunk group. Unless otherwise specified by the owner, the equipment shall be arranged to collect the billing data in the Bellcore AMA format as described in Bellcore document TR-TSY-000508, Automatic Message Accounting. (viii) If specified in Item 9.4, appendix A of this section, the equipment shall be arranged to store the billing data in a pollable system. If specified in Item 9.5, appendix A of this section, equipment shall be furnished to poll the pollable systems associated with the contract. (l) Fusing and protection requirements -- (1) General. (i) The equipment shall be completely wired and equipped with fuses, trouble signals, and arranged for printout of fault conditions, with all associated equipment for the wired capacity of the frames or cabinets provided. (ii) Design precautions shall be taken to prevent the possibility of equipment damage arising from the insertion of an electronic package into the wrong connector, the removal of a package from any connector, or the improper insertion of the correct card in its connector. (2) Fuses. Fuses and circuit breakers shall be of an alarm and indicator type, except where the fuses or breaker location is indicated on the alarm printout. Their rating shall be designated by numerals or color code on the fuse panel, where feasible. (3) Components. (i) Insofar as possible, all components shall be capable of being continuously energized at rated voltage without injurious results. Insofar as possible, design precautions shall be taken to prevent damage to other equipment and components when a particular component fails. (ii) Printed circuit boards or similar equipment employing electronic components shall be self-protecting against external grounds applied to the connector terminals, where feasible. Board components and coatings applied to finished products shall be of such material or treated so they will not support combustion. (iii) Every precaution shall be taken to protect electrostatically sensitive components from damage during handling. This shall include written instructions and recommendations (see Item 6.1,h of appendix C of this section). (m) Switching network requirements -- (1) The network. (i) All networks shall be comprised of solid-state components. (ii) The switching network shall employ time division digital switching and be compatible for connection to D3 type PCM channel banks without conversion to analog. (iii) Equipment shall be available as required to connect analog lines and trunks, analog or digital service circuits, digital carriers to RST's, D3 channel banks or other digital switching units. (2) Network quantity. Where the number of stages in the switching network and their control varies with the capacity of the system, sufficient equipment and wiring shall be supplied initially in order that there will be no service interruptions when additions are made up to the ultimate capacity as specified in appendix A of this section. This does not imply the necessity of supplying empty cabinets unless this is the only way the necessary wiring can be accomplished. (n) Stored program control (SPC) equipment requirements. (1) The system shall provide redundancy in call processing such that the failure of a call processing unit does not degrade the call processing capabilities of the switching system nor result in the loss of established calls. (2) Programs shall be modular, flexible and structured. In the interest of more dependable and more easily read programs, it is desirable to use a language which is more person-oriented leaving the detailed machine-oriented problems to a compiler program. Quality assurance of all software programs shall be in accordance with IEEE Std 730 - 1989, IEEE Standard for Software Quality Assurance Plans, or equivalent. (3) The office administration program shall have checks within it to prevent failure due to erroneous or inconsistent input data. It shall safeguard against the possibility of upsetting machine performance with improper instructions or information. In addition, modular structure shall allow the use of a variety of human-engineered service order formats. Service changes may be performed remotely if so desired. Average machine time for service change shall be 15 seconds or less. Service changes shall not be registered in permanent memory until verified. The access to the service change shall not have access to generic program. (4) The switching system shall be able to offer, by request, at least the following printouts of its routine stored data for administrative purposes: (i) A list of all assigned directory numbers, in numerical order, with their assigned class of service and line terminal numbers; (ii) A list of all directory numbers, in numerical order, associated with a class of service; (iii) A list of all unassigned line terminals; (iv) Traffic data in proper form for separation studies in accordance with the revenue separations procedures current at the time of the contract; (v) All lines on lockout; (vi) All lines assigned to intercept; (vii) All available (unassigned) directory numbers in the working thousands group; and (viii) A list of equipment busied out for maintenance. (5) The printouts in paragraph (n)(4) of this section may be delayed to times of light traffic. (6) Maintenance diagnostics shall be performed by a fault recognition system utilizing both software and hardware, each being used where they are most effective for maintenance and reliability. In the economic interests of providing early and efficient fault detection and accurate pinpointing of faulty areas, it is desirable to have a comprehensive person-machine interface supported by extensive automatic fault detection and analysis, involving diagnostic software for fault resolution and automatic recovery mechanisms to maintain continuous service. Maintenance messages may be channeled to a remote maintenance center if so desired. (7) Information in memory, having no requirement for changes to be introduced in the maintenance or operation of the system, may be stored in memory devices such as programmable read-only memory (PROM) or other devices that cannot be reprogrammed in the field. (o) Maintenance facilities -- (1) Alarm features, including alarm sending. (i) The equipment shall be arranged to provide audible and visual alarms indicating fuse operation or other circuit malfunctions resulting from component failure, crosses or open wiring, or any other conditions affecting service which can be detected economically. (ii) The alarms shall be classified in accordance with their effect on the system. (A) Catastrophic alarms demand immediate attention and require notification of the highest level of supervisory personnel. Conditions such as loss of service, loss of one or more remote line switches or line concentrators connected through Direct Digital Interface, loss of network control, and loss of computer program in all processors shall produce catastrophic alarms. (B) Major alarms demand rapid action. Conditions such as loss of one or more groups of subscribers or trunk ports, blown fuses for common groups of channels, loss of control to groups of channels, failure of one or both redundant units, and total loss of battery charging current for more than 15 minutes shall produce major alarms. (C) Minor alarms indicate nonemergency conditions which cause degraded service or fault conditions which causes the system to operate within less-than-optimum performance. Conditions discovered in automatic routining which have not shown in the operation of the equipment but require attention and cumulative line lockout (level adjustable) are examples of minor alarm conditions. (iii) When the office is arranged for unattended operation, facilities shall be provided for extending the alarm indications to an attended point. (iv) When the use of a separate outside plant facility for alarm sending is specified, the nature of the alarm may be indicated to the distant point by machine printout or other display device. (v) When alarm sending is accomplished over a regular operator office trunk, the operator shall be apprised that the call is an alarm indication by a distinctive tone, as specified by the owner in appendix A of this section. It shall be possible for the operator to determine at any time the presence of a trouble condition by dialing a number set aside for that purpose. This number shall also be accessible from lines classmarked for this feature. (vi) When the alarm sending circuit seizes an interoffice operator trunk, the operator must dial the alarm checking code over another trunk before the first trunk can be released except where the alarm condition has disappeared first. (vii) The alarm sending circuit shall have access to two or more trunks if the trunks are used for subscriber traffic. (viii) An alarm indication of higher priority shall supersede an original alarm indication and reseize an interoffice operator trunk. (ix) In any group of offices purchased under one contract, the same codes shall be used in each office for alarm checking and test. (x) When the alarm checking number is dialed, the alarm indications received shall be as follows: (A) Catastrophic alarm -- No tone. (B) Major alarm -- Continuous busy tone 60 IPM, unless alarm is overridden. (C) Minor alarm -- Continuous 1-ring code ringback tone, unless alarm is overridden._ (D) No trouble -- Continuous 2-ring code ringback tone, unless alarm is overridden. (xi) Audible and visual local alarms and transmitted alarms shall (TABLE START)be provided as follows: @h1 @h2Classification @h1Delay Interval @h2Local Alarms@h2Alarms Transmitted Catastrophic .... 0 .... 0 Major .... 0 .... 0\1\ Minor .... 0 .... 0 - 30 Min. Footnote: \1\Except no charge alarm delayed 15 minutes. (TABLE END) (xii) The central office alarm circuits shall be arranged to provide optional wiring to transmit either a minor alarm or a major alarm and a printout to accommodate various types of trunk and subscriber carrier systems, microwave, mobile radio, other transmission systems, and environmental protection systems with different priorities when a set of contacts is closed in the equipment of such systems and the alarm checking code is dialed. The alarm relay shall be furnished by the supplier of the carrier multiplex and/or mobile radio equipment. The option or options shall be specified by the owner. (2) Trouble location and test. (i) Equipment. (A) A maintenance center shall be provided with a fault recorder (printer and/or display) for troubles. Here, system and sub-system visual trouble indications are shown for maintenance aid. (B) The fault recorder shall provide a permanent or semi-permanent record of the circuit elements involved whenever a trouble is encountered. It shall be arranged to recognize an existing fault condition and not cause multiple printouts of the same fault, except during test routine. (ii) Maintenance system. (A) The maintenance system shall monitor and maintain the system operation without interruption of call processing, except for major failures. (B) The maintenance system shall provide both specialized maintenance hardware circuits and an extensive software package to enable maintenance to determine trouble to an individual card or functional group of cards. (C) Maintenance programs may be both on-line and off-line. On-line maintenance programs are activated by system errors and shall be scheduled to execute call tests during low traffic periods and periodic hardware tests at specific time intervals. Programs shall provide diagnostic tools for the maintenance personnel and be initiated by them. (D) Scheduled periodic hardware tests shall automatically detect faults and alert maintenance personnel via alarm or appropriate input/output device(s) at local and/or remote locations. (E) Facilities shall be provided so that test calls can be set up using pre-selected items of switching equipment. (F) The maintenance personnel shall be able to make tests to determine if every trunk and every item of switching equipment are functioning properly. Also, it shall be possible to make each trunk and each SPC equipment, or part thereof, busy to service calls. Where possible, equipment which is made busy to service calls shall still be accessible for test calls. (iii) Outside plant and subscriber stations. (A) A subscriber loop test set or equivalent shall be provided either as a separate set or as a part of the maintenance center, as specified in item 11.2 of appendix A of this section. This circuit shall include a high resistance volt-ohm meter, wiring to tip and ring terminals to permit a portable wheatstone bridge to be used, an operator's telephone circuit, a dial circuit (and pushbutton dialing keys, if specified), outgoing trunks to dial equipment for access to lines under test without use of the main distributing frame (MDF) test shoe and the necessary test keys. No dry cell batteries shall be accepted for test potentials. Circuits shall be designed so that alternating current (ac) induction on the line will have no effect on dc measurements. All functions shall be under control of lever or pushbutton keys. As a minimum the test system shall: (1) Test for bridged foreign electromotive force (EMF); (2) Test for regular line battery; (3) Test for booster battery voltage and polarity using the test shoe; (4) Test for open circuits, short, tip ground, and ring ground; (5) Test for tip or ring negative potential; (6) Test for capacitance of a subscriber's line; (7) Supply talking battery to the line with and without booster battery; (8) Ring the subscriber through the test access circuit or through a test shoe; (9) Test in and out of the central office; and (10) Supply a reverse polarity key for voltage readings, except when positive or negative values are displayed directly. (B) An acceptable arrangement for making the tests shown in paragraph (o)(2)(iii)(A) of this section is to have them under software control with results displayed at one of the system's I/O ports. (C) A howler circuit for maintenance purposes, if ordered by the owner, shall have output tones which do not interfere with the pushbutton or multifrequency signaling tones. The harmonics of the output tones shall be attenuated at least 26 dB below the fundamental frequency for all load conditions. The frequency stability shall be 2 percent or less for all output tones when the unit is operated in the specified load and environmental range. It shall be possible to vary the output voltage (power) of the howler circuit. It shall remove tone and restore the line to service when the telephone instrument receiver is placed on-hook. The frequency of the output shall be chosen to be distinctive and urgent in order to attract the subscriber's attention to an off-hook situation. (D) When a dial speed test facility is specified by the owner, it shall be accessed by dialing a special code and shall return to the calling station readily identifiable signals to indicate that the dial speed is slow, normal, or fast. (E) When the office is arranged for pushbutton dialing, optional facilities shall be provided for testing the pushbutton dialing equipment at the subscriber station. (F) When a system for testing subscriber lines in remote offices from a test position in a centrally located office is specified by the owner, it shall be capable of working with all the central offices and RST's in the remote areas. This testing equipment shall preferably be solid-state with a minimum of electromechanical devices and shall operate from central office battery. It shall be capable of working over any voice grade telephone circuit and shall not require a dedicated trunk. There shall be no interference to or from ``in-band'' voice channel tones. When used over a network, the verification or access shall be guarded to prevent unauthorized access by subscribers. Access to this system shall only be available to the test operator in all cases. (3) Transmission testing. (i) When transmission test circuits are specified in Item 11.3 of appendix A of this section, they shall permit testing of trunks by a distant office without any assistance in the local dial office. Analog test ports shall meet appropriate trunk requirements. If Centralized Automatic Reporting on Trunks (CAROT), or equivalent, is to be used, the equipment at the end office shall comply with Bellcore document SR-TSV-002275, BOC Notes on the LEC Networks -- 1990, section 8, Item 2. (ii) Transmission test circuits are available with a variety of options. These include single frequency and multifrequency tone generators with one or more generator output terminals, quiet terminations, and loop around test arrangements for both one-way and two-way trunks. (iii) Where multifrequency generators are used, they are usually arranged to provide a minimum of three frequencies. With some equipment, up to seven additional frequencies may be provided if needed. No industry standardization of test frequencies is as yet provided. Therefore, it is important that the selection of frequencies, the order in which they are applied and the time interval for application of each frequency be agreed upon by the connecting company and the RUS borrower and listed in appendix A of this section in those situations where connecting companies request the installation of multifrequency generators in borrowers' central offices. (iv) The milliwatt generator shall be solid-state and generate the analog or digital equivalent of 1004 Hz. The milliwatt generator shall be assigned to a 4-wire analog test port or be digitally generated. All 2-wire and 4-wire voice frequency ports are at a nominal 0 dBm0 level. The level of the 1004 Hz tone generator shall appear at outgoing 2-wire and 4-wire ports at 0 dBm ÿ1B 0.5 dB. For direct digital connections, the encoded output shall be the digital equivalent of a 0 dBm0 ÿ1B 0.5 dB signal. (v) Reference tone generators can be used individually or they can be part of a loop around test arrangement. If both single frequency and multifrequency reference tone generators are to be provided, only one can be arranged as part of a loop around test. Where a loop around arrangement is provided, the generator output can be obtained by dialing singly one of the two line terminals. By dialing the other line terminal singly, usually a 900 ohm resistor in series with a 2.16 microfarad capacitor is connected to the circuit under test to act as a ``quiet termination'' for noise measurements and other tests. Whenever both line terminals are held simultaneously, both the milliwatt supply and the quiet termination shall be lifted off and a ``loop around'' condition established. This permits the overall loss to be determined from the distant office by going out over one trunk, looping around in the end office and returning over the other trunk. The insertion loss of this test arrangement when used in a loop around configuration should not exceed 0.1 dB at the frequencies specified for the milliwatt supply. Unless otherwise specified, continuous off-hook supervision is to be provided on both line terminals to prevent collusive calling without charge. It will be permissible to accomplish the quiet termination by opening the 4-wire path internally and to accomplish the loop around by digital switching. (vi) Provision shall be made so that the milliwatt supply can be manually patched to circuits. (vii) Test jack access shall be provided for all interoffice trunks of the voice frequency type. The jack access shall be properly designated for line, drop, monitor, and signaling leads plus any other jacks as requested by the owner. This may be accomplished by a set of jacks located at the maintenance center which have access to each trunk on a switching basis. (p) Traffic -- (1) General engineering guidelines. (i) The Traffic Table, based on the Erlang Lost-Calls-Cleared Formula, shall be used for determining the quantity of intraoffice paths, registers, and senders where full availability conditions apply. The following table shows the (TABLE START)traffic capacity in CCS for 1 to 200 trunks at nine grades of service. Traffic Table Full Availability for Random Traffic Lost-Calls-Cleared Offered Traffic Expressed in CCS @h1Number of Trunks @h1B-.001 @h1.002 @h1.005 @h1.01 @h1.02 @h1.05 @h1.1 @h1.2 @h1.5 @h1Number of Trunks 1 .... 0 .... 0 .... 0 .... 0 .... 1 .... 2 .... 4 .... 9 .... 36 .... 1 2 .... 2 .... 3 .... 4 .... 5 .... 8 .... 14 .... 22 .... 36 .... 98 .... 2 3 .... 7 .... 9 .... 13 .... 17 .... 22 .... 32 .... 46 .... 69 .... 165 .... 3 4 .... 16 .... 19 .... 25 .... 31 .... 39 .... 55 .... 74 .... 106 .... 234 .... 4 5 .... 27 .... 32 .... 41 .... 49 .... 60 .... 80 .... 104 .... 144 .... 304 .... 5 6 .... 41 .... 48 .... 58 .... 69 .... 82 .... 107 .... 135 .... 184 .... 374 .... 6 7 .... 57 .... 65 .... 78 .... 90 .... 106 .... 135 .... 168 .... 224 .... 445 .... 7 8 .... 74 .... 83 .... 98 .... 113 .... 131 .... 163 .... 202 .... 265 .... 516 .... 8 9 .... 92 .... 103 .... 120 .... 136 .... 156 .... 193 .... 236 .... 307 .... 586 .... 9 10 .... 111 .... 123 .... 143 .... 161 .... 183 .... 224 .... 270 .... 348 .... 656 .... 10 11 .... 131 .... 145 .... 166 .... 186 .... 210 .... 255 .... 306 .... 391 .... 729 .... 11 12 .... 152 .... 167 .... 190 .... 212 .... 238 .... 286 .... 341 .... 433 .... 801 .... 12 13 .... 174 .... 190 .... 215 .... 238 .... 266 .... 318 .... 377 .... 476 .... 872 .... 13 14 .... 196 .... 213 .... 240 .... 265 .... 295 .... 350 .... 413 .... 519 .... 944 .... 14 15 .... 219 .... 237 .... 266 .... 292 .... 324 .... 383 .... 449 .... 562 .... 1015 .... 15 16 .... 242 .... 261 .... 292 .... 320 .... 354 .... 415 .... 486 .... 605 .... 1087 .... 16 17 .... 266 .... 286 .... 318 .... 347 .... 384 .... 449 .... 523 .... 648 .... 1158 .... 17 18 .... 290 .... 311 .... 345 .... 376 .... 414 .... 482 .... 560 .... 692 .... 1230 .... 18 19 .... 314 .... 337 .... 372 .... 404 .... 444 .... 515 .... 597 .... 735 .... 1302 .... 19 20 .... 339 .... 363 .... 399 .... 433 .... 474 .... 549 .... 634 .... 779 .... 1374 .... 20 21 .... 364 .... 388 .... 427 .... 462 .... 505 .... 583 .... 671 .... 823 .... 1445 .... 21 22 .... 389 .... 415 .... 455 .... 491 .... 536 .... 617 .... 709 .... 866 .... 1517 .... 22 23 .... 415 .... 441 .... 483 .... 521 .... 567 .... 651 .... 747 .... 910 .... 1589 .... 23 24 .... 441 .... 468 .... 511 .... 551 .... 599 .... 685 .... 784 .... 954 .... 1661 .... 24 25 .... 467 .... 495 .... 540 .... 580 .... 630 .... 720 .... 822 .... 998 .... 1733 .... 25 26 .... 493 .... 523 .... 568 .... 611 .... 662 .... 754 .... 860 .... 1042 .... 1805 .... 26 27 .... 520 .... 550 .... 598 .... 641 .... 693 .... 788 .... 898 .... 1086 .... 1876 .... 27 28 .... 546 .... 578 .... 627 .... 671 .... 725 .... 823 .... 936 .... 1130 .... 1948 .... 28 29 .... 573 .... 606 .... 656 .... 702 .... 757 .... 858 .... 974 .... 1174 .... 2020 .... 29 30 .... 600 .... 634 .... 685 .... 732 .... 789 .... 893 .... 1012 .... 1218 .... 2092 .... 30 31 .... 628 .... 662 .... 715 .... 763 .... 822 .... 928 .... 1050 .... 1263 .... 2164 .... 31 32 .... 655 .... 690 .... 744 .... 794 .... 854 .... 963 .... 1089 .... 1307 .... 2236 .... 32 33 .... 683 .... 719 .... 774 .... 825 .... 887 .... 998 .... 1127 .... 1351 .... 2308 .... 33 34 .... 711 .... 747 .... 804 .... 856 .... 919 .... 1033 .... 1165 .... 1395 .... 2380 .... 34 35 .... 739 .... 776 .... 834 .... 887 .... 951 .... 1068 .... 1203 .... 1439 .... 2452 .... 35 36 .... 767 .... 805 .... 864 .... 918 .... 984 .... 1104 .... 1242 .... 1484 .... 2524 .... 36 37 .... 795 .... 834 .... 895 .... 950 .... 1017 .... 1139 .... 1281 .... 1528 .... 2595 .... 37 38 .... 823 .... 863 .... 925 .... 981 .... 1050 .... 1174 .... 1319 .... 1572 .... 2667 .... 38 39 .... 851 .... 892 .... 955 .... 1013 .... 1083 .... 1210 .... 1358 .... 1617 .... 2739 .... 39 40 .... 880 .... 922 .... 986 .... 1044 .... 1116 .... 1246 .... 1396 .... 1661 .... 2811 .... 40 41 .... 909 .... 951 .... 1016 .... 1076 .... 1149 .... 1281 .... 1435 .... 1706 .... 2883 .... 41 42 .... 937 .... 980 .... 1047 .... 1108 .... 1182 .... 1317 .... 1474 .... 1750 .... 2955 .... 42 43 .... 966 .... 1010 .... 1078 .... 1140 .... 1215 .... 1352 .... 1512 .... 1795 .... 3027 .... 43 44 .... 995 .... 1040 .... 1109 .... 1171 .... 1248 .... 1388 .... 1551 .... 1839 .... 3099 .... 44 45 .... 1024 .... 1070 .... 1140 .... 1203 .... 1282 .... 1424 .... 1590 .... 1884 .... 3171 .... 45 46 .... 1053 .... 1099 .... 1171 .... 1236 .... 1315 .... 1459 .... 1629 .... 1928 .... 3243 .... 46 47 .... 1083 .... 1129 .... 1202 .... 1268 .... 1349 .... 1495 .... 1668 .... 1973 .... 3315 .... 47 48 .... 1112 .... 1159 .... 1233 .... 1300 .... 1382 .... 1531 .... 1706 .... 2017 .... 3387 .... 48 49 .... 1141 .... 1189 .... 1264 .... 1332 .... 1416 .... 1567 .... 1745 .... 2062 .... 3459 .... 49 50 .... 1170 .... 1220 .... 1295 .... 1364 .... 1449 .... 1603 .... 1784 .... 2106 .... 3531 .... 50 51 .... 1200 .... 1250 .... 1327 .... 1397 .... 1483 .... 1639 .... 1823 .... 2151 .... 3603 .... 51 52 .... 1229 .... 1280 .... 1358 .... 1429 .... 1516 .... 1675 .... 1862 .... 2195 .... 3675 .... 52 53 .... 1259 .... 1310 .... 1390 .... 1462 .... 1550 .... 1711 .... 1901 .... 2240 .... 3747 .... 53 54 .... 1289 .... 1341 .... 1421 .... 1494 .... 1584 .... 1747 .... 1940 .... 2285 .... 3819 .... 54 55 .... 1319 .... 1371 .... 1453 .... 1527 .... 1618 .... 1783 .... 1979 .... 2329 .... 3891 .... 55 56 .... 1349 .... 1402 .... 1484 .... 1559 .... 1652 .... 1819 .... 2018 .... 2374 .... 3962 .... 56 57 .... 1378 .... 1432 .... 1516 .... 1592 .... 1686 .... 1856 .... 2057 .... 2418 .... 4034 .... 57 58 .... 1408 .... 1463 .... 1548 .... 1625 .... 1719 .... 1892 .... 2096 .... 2463 .... 4106 .... 58 59 .... 1439 .... 1494 .... 1579 .... 1657 .... 1753 .... 1928 .... 2136 .... 2508 .... 4178 .... 59 60 .... 1468 .... 1525 .... 1611 .... 1690 .... 1787 .... 1965 .... 2174 .... 2552 .... 4250 .... 60 61 .... 1499 .... 1556 .... 1643 .... 1723 .... 1821 .... 2001 .... 2214 .... 2597 .... 4322 .... 61 62 .... 1529 .... 1587 .... 1675 .... 1756 .... 1855 .... 2037 .... 2253 .... 2642 .... 4394 .... 62 63 .... 1559 .... 1617 .... 1707 .... 1789 .... 1889 .... 2073 .... 2292 .... 2687 .... 4466 .... 63 64 .... 1590 .... 1648 .... 1739 .... 1822 .... 1923 .... 2110 .... 2331 .... 2731 .... 4538 .... 64 65 .... 1620 .... 1679 .... 1771 .... 1855 .... 1958 .... 2146 .... 2370 .... 2776 .... 4610 .... 65 66 .... 1650 .... 1710 .... 1803 .... 1888 .... 1992 .... 2182 .... 2409 .... 2821 .... 4682 .... 66 67 .... 1681 .... 1742 .... 1835 .... 1921 .... 2026 .... 2219 .... 2449 .... 2865 .... 4754 .... 67 68 .... 1711 .... 1773 .... 1867 .... 1954 .... 2060 .... 2255 .... 2488 .... 2910 .... 4826 .... 68 69 .... 1742 .... 1804 .... 1900 .... 1987 .... 2094 .... 2291 .... 2527 .... 2955 .... 4898 .... 69 70 .... 1773 .... 1835 .... 1932 .... 2020 .... 2129 .... 2328 .... 2566 .... 3000 .... 4970 .... 70 71 .... 1803 .... 1867 .... 1964 .... 2053 .... 2163 .... 2364 .... 2606 .... 3044 .... 5042 .... 71 72 .... 1834 .... 1898 .... 1997 .... 2087 .... 2197 .... 2401 .... 2645 .... 3089 .... 5114 .... 72 73 .... 1865 .... 1929 .... 2029 .... 2120 .... 2232 .... 2438 .... 2684 .... 3134 .... 5186 .... 73 74 .... 1895 .... 1961 .... 2061 .... 2153 .... 2266 .... 2474 .... 2723 .... 3178 .... 5258 .... 74 75 .... 1926 .... 1992 .... 2093 .... 2186 .... 2300 .... 2511 .... 2763 .... 3223 .... 5330 .... 75 76 .... 1957 .... 2024 .... 2126 .... 2219 .... 2335 .... 2547 .... 2802 .... 3268 .... 5402 .... 76 77 .... 1988 .... 2055 .... 2159 .... 2253 .... 2369 .... 2584 .... 2841 .... 3313 .... 5474 .... 77 78 .... 2019 .... 2087 .... 2191 .... 2286 .... 2404 .... 2620 .... 2881 .... 3357 .... 5546 .... 78 79 .... 2050 .... 2118 .... 2223 .... 2319 .... 2438 .... 2657 .... 2920 .... 3402 .... 5618 .... 79 80 .... 2081 .... 2150 .... 2256 .... 2353 .... 2473 .... 2694 .... 2959 .... 3447 .... 5690 .... 80 81 .... 2112 .... 2182 .... 2289 .... 2386 .... 2507 .... 2730 .... 2999 .... 3492 .... 5762 .... 81 82 .... 2143 .... 2213 .... 2321 .... 2420 .... 2542 .... 2767 .... 3038 .... 3537 .... 5834 .... 82 83 .... 2174 .... 2245 .... 2354 .... 2453 .... 2577 .... 2803 .... 3077 .... 3581 .... 5906 .... 83 84 .... 2206 .... 2277 .... 2386 .... 2487 .... 2611 .... 2840 .... 3117 .... 3626 .... 5977 .... 84 85 .... 2237 .... 2309 .... 2419 .... 2521 .... 2646 .... 2877 .... 3156 .... 3671 .... 6049 .... 85 86 .... 2268 .... 2340 .... 2452 .... 2554 .... 2680 .... 2913 .... 3196 .... 3716 .... 6121 .... 86 87 .... 2299 .... 2372 .... 2485 .... 2588 .... 2715 .... 2950 .... 3235 .... 3761 .... 6193 .... 87 88 .... 2331 .... 2404 .... 2517 .... 2621 .... 2750 .... 2987 .... 3275 .... 3805 .... 6265 .... 88 89 .... 2362 .... 2436 .... 2550 .... 2655 .... 2784 .... 3024 .... 3314 .... 3850 .... 6337 .... 89 90 .... 2393 .... 2468 .... 2583 .... 2688 .... 2819 .... 3060 .... 3353 .... 3895 .... 6409 .... 90 91 .... 2425 .... 2500 .... 2616 .... 2722 .... 2854 .... 3097 .... 3393 .... 3940 .... 6481 .... 91 92 .... 2456 .... 2532 .... 2649 .... 2756 .... 2889 .... 3134 .... 3432 .... 3984 .... 6553 .... 92 93 .... 2488 .... 2564 .... 2682 .... 2790 .... 2923 .... 3171 .... 3471 .... 4029 .... 6625 .... 93 94 .... 2519 .... 2596 .... 2715 .... 2823 .... 2958 .... 3208 .... 3511 .... 4074 .... 6697 .... 94 95 .... 2551 .... 2628 .... 2748 .... 2857 .... 2993 .... 3244 .... 3551 .... 4119 .... 6769 .... 95 96 .... 2582 .... 2660 .... 2781 .... 2891 .... 3028 .... 3281 .... 3590 .... 4164 .... 6841 .... 96 97 .... 2614 .... 2692 .... 2814 .... 2925 .... 3063 .... 3318 .... 3630 .... 4209 .... 6913 .... 97 98 .... 2645 .... 2724 .... 2847 .... 2958 .... 3097 .... 3355 .... 3669 .... 4253 .... 6985 .... 98 99 .... 2677 .... 2757 .... 2880 .... 2992 .... 3132 .... 3392 .... 3708 .... 4298 .... 7057 .... 99 100 .... 2709 .... 2789 .... 2913 .... 3026 .... 3167 .... 3429 .... 3748 .... 4343 .... 7129 .... 100 105 .... 2867 .... 2950 .... 3078 .... 3196 .... 3342 .... 3613 .... 3946 .... 4567 .... 7489 .... 105 110 .... 3027 .... 3112 .... 3244 .... 3366 .... 3516 .... 3798 .... 4143 .... 4792 .... 7849 .... 110 115 .... 3186 .... 3275 .... 3411 .... 3536 .... 3691 .... 3983 .... 4341 .... 5016 .... 8209 .... 115 120 .... 3347 .... 3437 .... 3578 .... 3707 .... 3867 .... 4168 .... 4539 .... 5241 .... 8569 .... 120 125 .... 3507 .... 3601 .... 3745 .... 3878 .... 4043 .... 4353 .... 4737 .... 5465 .... 8929 .... 125 130 .... 3669 .... 3765 .... 3912 .... 4049 .... 4219 .... 4539 .... 4935 .... 5689 .... 9289 .... 130 135 .... 3830 .... 3929 .... 4081 .... 4221 .... 4395 .... 4724 .... 5133 .... 5914 .... 9649 .... 135 140 .... 3992 .... 4093 .... 4249 .... 4392 .... 4571 .... 4910 .... 5332 .... 6138 .... 10009 .... 140 145 .... 4155 .... 4258 .... 4418 .... 4564 .... 4748 .... 5095 .... 5530 .... 6363 .... 10369 .... 145 150 .... 4318 .... 4423 .... 4586 .... 4737 .... 4925 .... 5282 .... 5728 .... 6587 .... 10729 .... 150 155 .... 4481 .... 4589 .... 4755 .... 4909 .... 5102 .... 5467 .... 5927 .... 6812 .... 11089 .... 155 160 .... 4644 .... 4755 .... 4925 .... 5082 .... 5279 .... 5654 .... 6125 .... 7037 .... 11449 .... 160 165 .... 4808 .... 4920 .... 5094 .... 5255 .... 5457 .... 5840 .... 6324 .... 7261 .... 11809 .... 165 170 .... 4972 .... 5087 .... 5264 .... 5428 .... 5634 .... 6026 .... 6523 .... 7486 .... 12169 .... 170 175 .... 5137 .... 5253 .... 5434 .... 5602 .... 5811 .... 6213 .... 6722 .... 7710 .... 12529 .... 175 180 .... 5301 .... 5420 .... 5604 .... 5775 .... 5989 .... 6399 .... 6920 .... 7935 .... 12889 .... 180 185 .... 5466 .... 5587 .... 5775 .... 5949 .... 6167 .... 6586 .... 7119 .... 8160 .... 13249 .... 185 190 .... 5631 .... 5754 .... 5945 .... 6123 .... 6345 .... 6773 .... 7318 .... 8384 .... 13609 .... 190 195 .... 5797 .... 5922 .... 6116 .... 6296 .... 6524 .... 6960 .... 7517 .... 8609 .... 13969 .... 195 200 .... 5962 .... 6089 .... 6287 .... 6471 .... 6702 .... 7146 .... 7716 .... 8834 .... 14329 .... 200 (TABLE END) (ii) The traffic capacity for all interoffice trunks shall be based on full availability, even though the distant office itself is not engineered to provide full availability access. (iii) The Traffic Table may also be used to determine the approximate traffic capacity of high-usage intertoll trunks. The traffic offered to high-usage groups may be read at B.10, signifying that 10 percent of the traffic overflows to the alternate route. This approximates the HU12 table used by AT&T. (iv) In reading the trunk quantity from the table, the higher quantity shall be used when the CCS load is three or more CCS over the lower quantity. For example, the number of trunks justified for 294 CCS at B.005 is 16, but for 295 CCS 17 trunks are justified. (v) Limited availability is not permitted. (vi) The traffic capacity in the following table should be used for small trunk groups such as pay station, special service trunks, intercept, (TABLE START)and PBX trunks, unless otherwise specified in appendix A of this section: @h1Number of Circuits @h1Permissible CCS 1 .... 10 2 .... 20 3 .... 30 4 .... 40 (TABLE END) (vii) The percentage of lines equipped for pushbutton dialing is to be used to determine the number of tone receivers. Local registers, if required, shall be supplied on the basis of all dial pulse. (2) Grade of service. (i) Grade of service specifies the expected performance when there are adequate service facilities for an assumed volume of traffic. It is expressed as a portion of the total traffic during a busy hour that cannot be terminated immediately or within a predetermined time period due to congestion. This places responsibility on the traffic engineers to specify facilities which will be entirely satisfactory to the users and which can be equipped at a price which will be accepted as reasonable. (ii) The number of calls encountering dial tone delay in excess of 3 seconds, measured over the busy hour of the four high-consecutive week (4HW) period, shall not be more than 1.5 percent. (iii) The average post dialing delay objective for an intraoffice call shall not exceed 1 second. This includes all connect, operate, and translation time. (iv) The line to line (intraoffice) network matching loss objective shall be 0.02 or less. (v) The blocking probabilities related to trunks include both ``mismatch'' probability and probability of ``all trunks busy.'' It is likely that the ``mismatch'' will be negligible in that many digital central offices have essentially nonblocking switching characteristics. The objectives for trunk connections are as follows: (A) Subscriber to outgoing trunk objective 0.01 or less; (B) Incoming trunk to subscriber objective 0.02 or less; and (C) Local trunk tandem objective 0.01 or less. (vi) Groups of common service circuits are to be engineered utilizing the full availability traffic tables that appear in paragraph (p)(1)(i) of this section at the following stipulated probabilities: (A) Outgoing trunks to 2/6 MF or dial pulse senders at B.001; (B) Incoming trunks to 2/6 MF receivers at B.001; (C) Incoming nondelay dial trunks to receivers at B.001; and (D) Incoming trunks with start dial at B.01. (vii) Remote Switching Terminals (RST's) shall meet the same grade of service objectives as the host. (3) Holding times. For the purpose of estimating the quantity of common control circuits, the following average holding times may be used. These holding times are conservative and represent the average effective and ineffective call. If these holding times are to be used, it must be so stated in appendix A of this section. (TABLE START) (i) The following average call holding times (HT) may be used. @h1Type of Call @h1HT -- Seconds Intraoffice .... 120 Revertive .... 150 EAS .... 150 Special Service, Intercept, Verification .... 60 Toll, CLR .... 300 Toll, S-S .... 24 Toll, PPCS .... 270 (TABLE END) (ii) The following average subscriber dialing holding times may be (TABLE START)used (times used to dial digits do not include machine time). @h1 @h1Digits Dialed @h1DP Sec. @h1Pushbutton Sec. Operator, Non-Pay Station .... 1 .... 4.7 .... 3.4 Special Service .... 3 .... 7.7 .... 5.0 Local .... 7 .... 13.7 .... 8.2 EAS .... 7 .... 13.7 .... 8.2 DDD: 1/0+7 .... 8 .... 15.2 .... 9.0 DDD: 1/0+10 .... 11 .... 19.7 .... 11.4 Dialing Time Per Digit .... - .... 1.5 .... 0.8 Dial Tone Response .... - .... 3.2 .... 2.6 (TABLE END) (iii) The following average incoming register holding times may be (TABLE START)used (times for digit registrations do not include machine time). @h1 @h1Basic@h2 Holding Time (Sec.)@h2Digits @h1Additional Per Digit MF Receiver from: No. 5 Crossbar -- Non-LAMA .... 1.4 .... 4 .... 0.14 No. 5 Crossbar -- LAMA .... 2.3 .... 4 .... 0.14 Crossbar Tandem & 4A Toll .... 3.1 .... 4 .... 0.14 No. 1 ESS .... 1.4 .... 4 .... 0.14 Key Pulsing Switchboard .... 5.2 .... 4 .... 0.60 DP Receivers -- 10 PPS from: SxS .... 6.0 .... 4 .... 1.5 Dialing Switchboard .... 6.6 .... 4 .... 1.3 4A Toll .... 5.6 .... 5\1\ .... - Crossbar Tandem .... 4.9 .... 4 .... 1.2 Footnote: \1\No reduction for fewer digits. (TABLE END) (iv) The following average sender holding times may be used (does (TABLE START)not include machine setup and release time). @h1 @h1Basic@h2 Holding Time (Sec.)@h2Digits @h1Additional Per Digit MF Senders: No. 5 Crossbar .... 1.5 .... 4 .... 0.14 Crossbar Tandem & 4A Toll\1\ .... 2.0 .... 4 .... 0.14 TSP/TSPS .... 2.4 .... 7 .... 0.14 SxS -- CAMA, Called Number .... 3.7 .... 7 .... 0.14 SxS -- CAMA, Calling Number .... 1.3 .... 7 .... - DP Senders -- 10 PPS: With Overlap Pulsing\2\ .... 9.1 .... Up to 6 .... 1.8 Without Overlap Pulsing .... 4.6 .... 4 .... 1.2 Footnote: \1\Add 1.3 seconds for ANI outpulsing on special toll (0+) calls and on DDD calls if AMA is not provided. Footnote: \2\Assumes overlap outpulsing starting on receiving of third digit; applies only to calls handled on direct trunk groups. (TABLE END) (4) Traffic data requirements. (i) Traffic measurements are composed of primarily two types -- counts and usage. The following types of traffic data recording are required: (A) Peg count registers shall be incremented when a successful network connection is established to a particular circuit group such as trunks, senders, digital receivers, etc. (B) Overflow count registers shall be incremented when access to a particular circuit group is denied due to all resource busy condition. (C) Network blockage count registers shall be incremented due to an unavailability of a path in an access or switching matrix network. (D) Usage measurements of the length of time associated with a particular setup event or network connection shall be made. Usage data measurements are normally collected by scanning circuit groups resources every 10 or 100 seconds to determine busy/idle states. Measurements are accumulated and read directly in CCS (hundred call seconds). (E) Service delay measurements shall provide percentage counts of the calls for a particular service that are delayed beyond a specified interval of time, e.g., calls not receiving dial tone within 3 seconds after call origination. (ii) Traffic data shall be stored in electronic storage registers or block of memory consisting of one or more traffic counters for each item to be measured. The registers listed in paragraph (p)(4)(i) of this section shall be associated with the interoffice trunks, switching network and central control equipment in such a manner that the register readings can be used to determine the traffic load and flow to, from and within the system. Two-way trunks shall be metered to indicate inward and outward seizures. The bidder shall indicate what registers are to be supplied and their purpose. (iii) The measured data shall be shown on a printout. It should be possible to have local or remote printout, or both. Arrangement shall be made for automatic data printout on command for 15-, 30-, or 60-minute intervals as required, and be arranged for automatic start-stop and in accordance with revenue separation procedures current at the time of contract. (iv) All traffic records shall have dates and times and office identification. (q) Transmission -- (1) General. The transmission characteristics will be governed by the fact that the switching matrix will be based on digital operation. Unless otherwise stated, the requirements are in terms of analog measurements made from Main Distributing Frame (MDF) to MDF terminals, excluding cabling loss. (2) Impedance. For the purpose of this section, the nominal input impedance of analog ports in an end office shall be 900 ohms for 2-wire ports and 600 ohms for 4-wire ports. Where the connecting facility or equipment is other than this impedance, suitable impedance matching shall be provided by the bidder when specified by the owner. (3) Insertion loss. The insertion loss in both directions of transmission at 1004 Hz shall meet the following requirements when measured with a 0 dBm input signal at 900 ohms (or 600 ohms, when required) at a temperature of 77«F ÿ1B 9«F (25«C ÿ1B 5«C). (i) Trunk-to-trunk or trunk-to-line. The loss shall be set between 0 and 0.5 dB for 2-wire to 2-wire, 2-wire to 4-wire, or 4-wire to 4-wire voice frequency connections. (ii) Line-to-line. The loss shall be set between 0 and 2 dB. (iii) Direct digital interface. On a direct digital interface, the loss through the office shall be adjusted to the proper level in the receive side. (iv) Stability. The long-term allowable variation in loss through the office shall be ÿ1B 0.5 dB from the loss specified by the bidder. (4) Frequency response (loss relative to 1004 hz) shall meet the following requirements. (TABLE START) (i) Trunk-to-trunk. @h1 @h2Frequency (Hz) @h1Loss at 0 dBm0 Input\1\@h22-Wire to 2-Wire@h24-Wire to 4-Wire 60 .... 20 dB Min.\2\ .... 16 dB Min.\2\ 200 .... 0 to 5 dB .... 0 to 3 dB 300 - 3000 .... 0.5 dB to 1 dB .... 0.3 to +0.3 dB 3300 .... 1.5 dB Max. .... 1.5 dB Max. 3400 .... 0 to 3 dB .... 0 to 3 dB Footnote: \1\() means less loss and (+) means more loss. Footnote: \2\Transmit End (TABLE END) (TABLE START) (ii) Line-to-line. @h1Frequency (Hz) @h1Loss at 0 dBm0 Input\1\ 60 .... 20 dB Min.\2\ 300 .... 1 to +3 dB 600 - 2400 .... ÿ1B1 dB 3200 .... 1 to +3 dB Footnote: \1\() means less loss and (+) means more loss. Footnote: \2\Transmit End (TABLE END) (iii) Trunk-to-line. The trunk-to-line frequency response requirements shall be a compromise between those values specified in paragraphs (q)(4)(i) and (q)(4)(ii) of this section. (5) Overload level. The overload level at 900 ohm impedance shall be +3 dBm0. (6) Gain tracking (linearity) shall meet the following (TABLE START)requirements. @h1Input Signal Level\1\ @h1Maximum Gain Deviation +3 to 37 dBm0 .... ÿ1B0.5 dB 37 to 50 dBm0 .... ÿ1B1 dB Footnote: \1\1004 Hz reference at 0 dBm0. (TABLE END) (7) Return loss. (i) The specified return loss values are determined by the service and type of port at the measuring (near) end. Two-wire ports are measured (near end) at 900 ohms in series with 2.16 microfarads and 4-wire ports are measured at 600 ohms resistive. (ii) Far end test terminations shall be as follows: (A) Loaded line circuit -- 1650 ohms in parallel with the series combination of .005 microfarads and 100 ohms; (B) Nonloaded line circuit -- 800 ohms in parallel with the series combination of .05 microfarads and 100 ohms; (C) Special service line circuit including electronic lines and carrier lines -- 900 ohms in series with 2.16 microfarads; (D) Two-wire trunk -- 900 ohms in series with 2.16 microfarads; and (E) Four-wire trunk -- 600 ohms. (iii) For trunk-to-trunk (2-wire or 4-wire) connections the echo return loss (ERL) shall be 27 dB, minimum and the singing return loss (SRL) shall be 20 dB, minimum low and 23 dB, minimum high. (iv) For trunk-to-line (2-wire or 4-wire) connections the ERL shall be 24 dB, minimum and the SRL shall be 17 dB, minimum low and 20 dB, minimum high. (v) For line-to-line or line-to-trunk (2-wire or 4-wire) connections the ERL shall be 18 dB, minimum and the SRL shall be 12 dB, minimum low and 15 dB, minimum high. (8) Longitudinal balance. The minimum longitudinal balance, with dc loop currents of 20 to 70 mA, shall be 60 dB at all frequencies between 60 and 2000 Hz, 55 dB at 2700 Hz and 50 dB at 3400 Hz. The method of measurement shall be as specified in the IEEE Std 455 - 1985, IEEE Standard Test Procedure for Measuring Longitudinal Balance of Telephone Equipment Operating in the Voice Band. Source voltage level shall be 10 volts root-mean-square (rms). (9) 60 hz longitudinal current immunity. Under test conditions with 60 Hz, the system noise shall be no greater than 23 dBrnC0 as measured using the configuration in Figure 1. 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l 15002 4459 l 15018 4409 l 15035 4393 l 14919 4624 s m15068 4624 l 400 5391 s m799 5990 l 1 5791 l 1198 7188 l s end restore%%Trailer@!_ Notes: 1. 900 ohm termination, C-message weighting, hold coil off 2. SNC Noise Choke 35 W, or equivalent 3. Test at 0.020 Adc and 0.070 Adc 4. 2 ÿ1B 0.001 microfarad, 150 Vdc (10) Steady noise (idle channel at 900 ohms impedance) measured on a terminated call shall be 23 dBrnC0 maximum and average 18 dBrnC0 or less. The 3K Hz Flat noise should be less than 35 dBrnC0 as an objective. (11) Impulse noise. The central office switching equipment shall be capable of meeting an impulse noise limit of not more than five counts exceeding 54 dBrnC0 voice band weighted in a 5-minute period on six such measurements made during the busy hour. A Northeast Electronics Company TTS 4002 Impulse Noise Counter, Wilcom T194C, Hewlett Packard 4945, or equivalent, should be used for the measurements. The measurement shall be made by establishing a normal connection from the noise counter through the switching equipment in its off-hook condition to a quiet termination of 900 ohms impedance. Office battery and signaling circuit wiring shall be suitably segregated from voice and carrier circuit wiring, and frame talking battery filters provided, if and as required, in order to meet these impulse noise limits. (12) Crosstalk coupling. Worst case equal level crosstalk is to be 75 dB minimum in the range 200 - 3400 Hz. This is to be measured between any two paths through the system connecting a 0 dBm0 level tone to the disturbing pair. (13) Quantizing distortion. (i) The switching system shall (TABLE START)meet the following requirements. @h1Input Level (dBm0) 1004 or 1020 Hz @h1Minimum Signal to Distortion with C-Message Weighting 0 to 30 .... 33 dB 30 to 40 .... 27 dB 40 to 45 .... 22 dB (TABLE END) (ii) Due to the possible loss of the least significant bit on direct digital connections, a signal to distortion degradation of up to 2 dB may be allowed where adequately justified by the bidder. (14) Absolute delay. The absolute one-way delay through the switching system, excluding delays associated with RST switching, shall not exceed 1000 microseconds analog-to-analog measured at 1800 Hz. (15) Envelope delay distortion. On any properly established connection, the envelope delay distortion shall not exceed the following (TABLE START)limits. @h1Frequency Range (Hz) @h1Microseconds 1000 to 2600 .... 190 800 to 2800 .... 350 600 to 3000 .... 500 400 to 3200 .... 700 (TABLE END) (16) Digital error rate. The digital switching system shall not introduce an error into digital connections which is worse than one error in 108 bits averaged over a 5-minute period. (17) Battery noise. Noise across battery at power board distribution bus terminals shall not exceed 35 dBrnC during the busy hour. (18) Radio and television interference. The central office switching equipment shall be designed and installed so that radiation of high frequency noise will be limited so as not to interfere with radio and television receivers. (r) Timing intervals -- (1) Type of equipment required. The equipment for providing the specified timing intervals shall be solid-state. (2) Tolerance. Where a range of time is specified as minimum and maximum, the lower limits shall be considered as controlling and the variation between this minimum and the actual maximum shall be kept as small as practicable. In no case shall the quoted upper limit be exceeded. (3) Permanent signal timing. Lockout shall occur after an interval of 20 to 30 seconds after receipt of dial tone if a ``permanent'' condition occurs prior to the transmission of dial pulses or pushbutton dialing signals. This interval may be reduced appreciably during periods of heavy traffic. (4) Partial dial timing. Partial dial timing shall be within 15 to 37 seconds. This timing may be reduced appreciably during periods of heavy traffic. (5) Charge delay timing. Charge delay timing shall be within 2 seconds. (6) ``Don't answer'' disconnect timing. On revertive calls, a ``don't answer'' disconnect feature shall be provided which shall operate within a period of 2 to 4 minutes should the called party not answer. (7) Called party disconnect timing. Timed disconnect of a terminating path under control of the called party shall be 10 to 32 seconds. (8) Timing intervals for signals involved in distance dialing. Timing intervals shall be provided to meet the requirements for distance dialing equipment, which have been established in Bellcore document SR-TSV-002275, BOC Notes on the LEC Networks -- 1990. Some of the more important times which this document specifies are for: (i) Disconnect signal; (ii) Wink signal; (iii) Start dialing signal; (iv) Pulse delay signal; (v) Go signal; (vi) Digit timing; and (vii) Sender, register, and link attachment timing. (s) Power requirements and equipment -- (1) Operating voltage. The nominal operating voltage of the central office shall be 48 volts dc, provided by a battery with the positive side tied to system ground. (2) Batteries. (i) When battery cells of the lead antimony type are specified, the pasted plate type shall be considered adequate. (ii) When lead calcium cells are specified, no cell shall differ from the average voltage of the string of fully charged cells by more than ÿ1B0.03 volt when measured at a charging rate in amperes equivalent to 10 percent of the ampere hour capacity of the cells. Similarly, when cells are fully charged and floating between 2.30 and 2.33 volts per cell, the cell voltage of any cell in a given string shall not differ more than ÿ1B0.03 volt from the average. These requirements are for test purposes only and do not apply to operating conditions. (iii) Voltage readings shall be corrected by a temperature coefficient of 0.0033 volt per degree F (0.006 per degree C), whenever temperature variations exist between cells in a given string. This correction factor shall also be applied when comparing cell voltages taken at different times and at different temperatures. The correction factor shall be added to the measured voltage when the temperature is above 77_F (25_C) and subtracted when the temperature is below 77_F (25_C). (iv) The specific gravity readings of lead antimony cells at full charge shall be 1.210 ÿ1B .010 at 77_F (25_C) at maximum electrolyte height. (v) When counter cells are supplied by the bidder, they shall be the dry counter electromotive force (CEMF) type. (vi) When lead antimony batteries are specified, they shall be designed to last a minimum of 10 years when maintained on a full float operation between 2.15 and 2.17 volts per cell. When lead calcium batteries are specified, they shall be designed to last a minimum of 20 years when maintained on full float operation between 2.17 and 2.25 volts per cell. The battery shall be clearly designated as ``antimony'' or ``calcium'' by means of stencils, decals or other devices. (vii) Each battery cell shall be equipped with an explosion control device. (viii) The battery size shall be calculated in accordance with standard procedures. The battery in no case shall have a reserve capacity in ampere hours less than four times the current capacity of the largest charger. (3) Charging equipment. (i) Charging shall be on a full float basis. The rectifiers shall be of the full wave, self-regulating, constant voltage, solid-state type and shall be capable of being turned on and off manually. (ii) When charging batteries, the voltage at the battery terminals shall be adjustable and shall be set at the value recommended for the particular battery being charged, providing it is not above the maximum operating voltage of the switching system equipment. The voltage shall not vary more than plus or minus 0.02 volt per cell between 10 percent load and 100 percent load. Between 3 percent and 10 percent load, the output voltage shall not vary more than plus or minus 0.04 volt per cell. Beyond full load current, the output voltage shall drop sharply. The output voltage shall be maintained with the line voltage variations of plus or minus 10 percent. Provision shall be made to change the output voltage of the rectifier manually to 2.25 volts per cell to provide an equalization charge on the battery. (iii) The charger noise shall not exceed 22 dBrnC when measured with a suitable noise measuring set and under the rated battery capacitance and load conditions as determined in Figure 2. Figure 2 -- Charger Noise Test %%BoundingBox: 90 72 720 540@!%!PS-Adobe-2.0 EPSF-1.2%%Creator: Harvard Graphics 2.30%%TiFIG2NEW named%%BoundingBox: 90 72 720 540%%Pages: 0%%DocumentFonts: Helvetica Times-Roman Times-Italic%%+ IntlHelvetica IntlTimes-Roman IntlTimes-Italic%%DocumentSuppliedFonts: IntlHelvetica IntlTimes-Roman IntlTimes-Italic%%EndComments/HGdict 30 dict def %define local dictionaryHGdict begin %push dictionary onto the dictionary stack/s /stroke load def/m /moveto load def/l /lineto load def/f {findfont exch scalefont setfont} bind def/l0 {setlinewidth 0 setdash} bind def/l1 {s [20 80] 1 l0} bind def/l2 {s [300 150] 1 l0} bind def/l3 {s [] 30 l0} bind def/l4 {s [] 1 l0} bind def/sn {stringwidth pop neg} bind def/rj {sn 0 rmoveto} bind def/cj {sn 2 div 0 rmoveto} bind def/reencsmalldict 12 dict def/ReEncodeSmall{ reencsmalldict begin/newcodesandnames exch def/newfontname exch def/basefontname exch def/basefontdict basefontname findfont def/newfont basefontdict maxlength 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/guillemotright8#341 /germandbls8#345 /space8#346 /u8#347 /space8#350 /space8#351 /space%%8#365 /section8#370 /ring8#376 /endash] defend %pop HGdict off the dictionary stack%%EndProlog%%BeginSetupsaveHGdict begin72 2400 div dup scale1 setlinewidth 0 setlinecap 0 setlinejoin[] 0 setdash 0 setgray 10 setmiterlimit%%BeginFont: IntlHelvetica/Helvetica /IntlHelvetica spanvec ReEncodeSmall%%EndFont%%BeginFont: IntlTimes-Roman/Times-Roman /IntlTimes-Roman spanvec ReEncodeSmall%%EndFont%%BeginFont: IntlTimes-Italic/Times-Italic /IntlTimes-Italic spanvec ReEncodeSmall%%EndFont%%EndSetup%%Page: one 1newpath3000 2400 translatel4s 0 setgray1 3994 s m1 13178 l 6390 13178 l 6390 3994 l 1 3994 l 14010 3994 s m14010 13178 l 20399 13178 l 20399 3994 l 14010 3994 l s 4993 11827 m14976 11827 l 14976 11886 l 4993 11886 l 4993 11827 l eofill4993 11827 s m14976 11827 l 14976 11886 l 4993 11886 l 4993 11827 l s 5266 11856 m5266 11859 l 5266 11868 l 5266 11878 l 5265 11887 l 5263 11897 l 5262 11906 l 5260 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