1、 TIA-968-B-3 (Addendum to TIA-968-B) March 2016Telecommunications Telephone Terminal Equipment Technical Requirements for Connection of Terminal Equipment to the Telephone Network- Addendum 3 ANSI/TIA-968-B-3-2016 APPROVED: MARCH 23, 2016 NOTICE TIA Engineering Standards and Publications are designe
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23、AL ELEMENT OF THE USE OF THE CONTENTS HEREOF, AND THESE CONTENTS WOULD NOT BE PUBLISHED BY TIA WITHOUT SUCH LIMITATIONS. ANSI/TIA-968-B-3 i TABLE OF CONTENTS 1. SCOPE 1 2. MISCELLANEOUS CHANGES . 1 2.1 Addition to Sub-clause 3.2, Acronyms & Abbreviations .1 2.2 Addition to Annex C Bibliography 1 3.
24、CHANGES TO REMOVE TYPE B RINGING REQUIREMENTS 1 3.1 Changes to Table 6 .1 3.2 Changes to Sub-clauses of 5.1.11.2 (Loop Start) 2 3.3 Changes to Sub-clauses of 5.1.12.2 (Ground Start) 3 4. ADDITION OF NEW SUB-CLAUSE FOR DSL G.FAST SPECIFICATION 5 ANSI/TIA-968-B-2 ii FOREWORD (This foreword is not part
25、 of this Standard.) This document is an addendum to TIA-968-B, Telecommunications Telephone Terminal Equipment Technical Requirements for Connection of Terminal Equipment to the Telephone Network. It was developed to add new interface requirements for a class of DSL service known as Fast Access to S
26、ubscriber Terminals (FAST) and to remove the requirements for Type B ringing. Support for Type B ringing has not been required by the ATIS-0600401.2006 (formerly T1.401) network interface standard since 2000. This addendum was produced by Subcommittee TR-41.9, Technical and Administrative Regulatory
27、 Considerations. It was developed in accordance with TIA procedural guidelines, and represents the consensus position of the Subcommittee, which served as the formulating group. It also received the concurrence of Engineering Committee TR-41, Performance and Accessibility for Communications Products
28、. The leadership of the TR-41.9 Technical and Administrative Regulatory Considerations Subcommittee (Interim Chair: Jason Nixon, Innovation, Science and Economic Development Canada) acknowledges the written contributions provided by the following individuals in the development of this addendum. Orga
29、nization Representative TIA-968-B-3 Cisco Systems, Inc. Tim Lawler Editor Whitesell Consulting LLC Stephen R Whitesell Editor Innovation, Science and Economic Development Canada Magdoly Rondon Suggestions for improvement of this document are welcome. They should be sent to: Telecommunications Indust
30、ry Association Technology and Standards Department Suite 200 1320 North Courthouse Road Arlington, VA 22201 ( http:/www.tiaonline.org ) ANSI/TIA-968-B-3 1 1. SCOPE This addendum provides changes to TIA-968-B, Telecommunications Telephone Terminal Equipment Technical Requirements for Connection of Te
31、rminal Equipment to the Telephone Network. Clause 2 provides an addition to the list of acronyms and abbreviations in sub-clause 3.2 of the standard and an additional informative reference for the bibliography in Annex C. Clause 3 removes the requirements for Type B ringing from Table 6 and from var
32、ious sub-clauses of 5.1.11 (loop start interfaces) and 5.1.12 (ground start interfaces). Clause 4 adds a new sub-clause 5.3.10 with interface requirements for a class of DSL service known as Fast Access to Subscriber Terminals (FAST1). None of the other clauses in TIA-968-B are affected. Where modif
33、ications are being made to existing text, additions to the text are shown underlined and deletions are shown using strikeout. Words that appear in underlined italics in this addendum are intended as instructions to the reader. Where those instructions make it clear that only new text is being added,
34、 underlining for the new text is omitted for ease of reading. 2. MISCELLANEOUS CHANGES 2.1 Addition to Sub-clause 3.2, Acronyms & Abbreviations Add the following acronym to sub-clause 3.2: FAST: Fast access to subscriber terminals 2.2 Addition to Annex C Bibliography Add the following informative re
35、ference to Annex C: C.11 ITU-T Recommendation G.9700 (2014), Fast access to subscriber terminals (G.fast) Power spectral density specification. 3. CHANGES TO REMOVE TYPE B RINGING REQUIREMENTS 3.1 Changes to Table 6 Revise Table 6 as follows: 1A FAST interface is also commonly referred to as G.fast
36、ANSI/TIA-968-B-2 2 Table 6 Simulated ringing voltages and impedance limitations Ringing type Range of compatible ringing frequencies (Hz) Simulated ringing voltage superimposed on 56.5 VDC Impedance limitation (ohms) A 20 3 40 to 130 V rms 1400 30 3 40 to 130 V rms 1000 B (see note) 15.3 to 34 40 to
37、 130 V rms 1600 34 to 49 62 to 130 V rms 1600 49 to 68 62 to 150 V rms 1600 NOTE Specifications for Type B ringing are no longer part of this standard. 3.2 Changes to Sub-clauses of 5.1.11.2 (Loop Start) Revise the sub-clauses of 5.1.11.2 as follows: 5.1.11.2 Limitations on equipment intended for op
38、eration on loop start telephone facilities: Approved terminal equipment and approved protective circuitry shall conform to the following limitations. 5.1.11.2.1 On-hook resistance, metallic and longitudinal (up to 100 VDC): The on-hook DC resistance between the tip and ring conductors of a loop star
39、t interface, and between each of the tip and ring conductors and earth ground, shall be greater than 5 M ohms for all DC voltages up to and including 100 V. 5.1.11.2.2 On-hook resistance, metallic and longitudinal (100 to 200 VDC): The on-hook DC resistance between tip and ring conductors of a loop
40、start interface, and between each of the tip and ring conductors and earth ground shall be greater than 30 k ohms for all DC voltages between 100 and 200 V. 5.1.11.2.3 DC current during ringing: During the application of simulated ringing, as listed in table 6, to a loop start interface, the total D
41、C current shall not exceed 3.0 mA. The equipment shall comply for each ringing type that is listed as part of the ringer equivalence. 5.1.11.2.4 Ringing frequency impedance (metallic): During the application of simulated ringing, as listed in table 6 to a loop start interface, the impedance between
42、the tip and ring conductors (defined as the quotient of applied AC voltage divided by resulting true rms current) shall be greater than or equal to the value specified in table 6. The equipment shall comply for each ringing type that is listed as part of the ringer equivalence. 5.1.11.2.5 Ringing fr
43、equency impedance (longitudinal): During the application of simulated ringing as listed in table 6 to a loop start interface, the impedance between each of the tip and ring conductors and ground shall be greater than 100 k ohms. The equipment shall comply with each ringing type listed in the ringer
44、equivalence. 5.1.11.2.6 Ringer equivalence definition: The ringer equivalence number shall be the value determined in 5.1.11.2.7 or 5.1.11.2.8, as appropriate, followed by the ringer ANSI/TIA-968-B-3 3 type letter “A” indicating the frequencies indicator representing the frequency range for which th
45、e number is valid. If ringer equivalence is to be stated for more than one ringing type, testing shall be performed at each frequency range to which ringer equivalence is to be determined in accordance with the above, and the largest resulting ringer equivalence number so determined shall be associa
46、ted with each ringing type letter designation for which it is valid. Testing shall be performed at each frequency specified for Type A ringing, and the largest ringer equivalence number so determined shall be associated with that ringing type. Requirements for Type B ringing are no longer specified
47、in this standard. 5.1.11.2.7 Ringer equivalence for equipment operating on loop start telephone facilities: The ringer equivalence shall be five times the impedance limitation listed in table 6, divided by the minimum measured AC impedance, as defined in 5.1.11.2.8 5.1.11.2.4, during the application
48、 of simulated ringing as listed in table 6. 5.1.11.2.8 Maximum ringer equivalence: All approved terminal equipment and approved protective circuitry that can affect the ringing frequency impedance shall be assigned a ringer equivalence. The sum of all such ringer equivalences on a given telephone li
49、ne or loop shall not exceed 5. In some cases, a system that has a total ringer equivalence of 5 or more may not be usable on a given telephone line or loop. 3.3 Changes to Sub-clauses of 5.1.12.2 (Ground Start) Revise the sub-clauses of 5.1.12.2 as follows: 5.1.12.2 Limitations on individual equipment intended for operation on ground start telephone facilities: Approved terminal equipment and approved protective circuitry shall conform to the following limitations: 5.1.12.2.1 DC current during ringing: During the application of simulated ringing, as listed in tab
