1、 TSB-31-D-3 (Addendum to TSB-31-D) March 2016Telecommunications Telephone Terminal Equipment Rationale and Measurement Guidelines for U.S. Network Protection-Addendum 3NOTICE TIA Engineering Standards and Publications are designed to serve the public interest through eliminating misunderstandings be
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23、ATIONS. TSB-31-D-3 i TABLE OF CONTENTS 1. SCOPE 1 2. MODIFICATIONS TO EXISTING TSB-31-D TEXT 1 2.1 Changes to clause 3, REFERENCES 1 2.2 Changes to sub-clause 5.5, Suggested Equipment List (SEL) 1 3. REPLACEMENT TEXT FOR SUB-CLAUSE 14.2 . 2 4. TEXT FOR NEW APPENDIX F 7 TSB-31-D-3 FOREWORD (This fore
24、word is not part of this Standard.) This document is an addendum to TIA TSB-31-D, Telecommunications Telephone Terminal Equipment Rationale and Measurement Guidelines for U.S. Network Protection. It was developed to implement the use of conversational gain test procedures as described in ANSI/TIA-49
25、65 for showing compliance with the receive volume control requirements in 47 CFR 68.317. It supersedes the information provided in TIA TSB-31-D-1 (Addendum 1). This addendum was produced by Subcommittee TR-41.9, Technical and Administrative Regulatory Considerations. It was developed in accordance w
26、ith 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. The leadership of the TR-41.9 Technical and Adm
27、inistrative 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. Organization Representative TSB-31-D-3 Whitesell Cons
28、ulting LLC Stephen R Whitesell Editor Cisco Systems, Inc. Tim Lawler Innovation, Science and Economic Development Canada Jason Nixon Innovation, Science and Economic Development Canada Magdoly Rondn Suggestions for improvement of this standard are welcome. They should be sent to: Telecommunications
29、Industry Association Technology and Standards Department Suite 200 1320 North Courthouse Road Arlington, VA 22201 ( http:/www.tiaonline.org ) TSB-31-D-3 1 1. SCOPE This addendum provides changes to TSB-31-D, Telecommunications Telephone Terminal Equipment Rationale and Measurement Guidelines for U.S
30、. Network Protection. It supersedes the TSB-31-D-1 addendum to the above document. Clause 2 of this document provides changes to clause 3, REFERENCES and to sub-clause 5.5, Suggested Equipment List (SEL) of TSB-31-D. Clause 3 of this document provides completely new text for sub-clause 14.2 of TSB-3
31、1-D on test procedures for receive volume control. The new text incorporates the changes to the original text of sub-clause 14.2 that were made by TSB-31-D-1 and adds additional text referencing conversational gain test procedures in accordance with ANSI/TIA-4965. Clause 4 of this document provides
32、the actual conversational gain test procedures in the form of a new Appendix F to be added to TSB-31-D. The other clauses and sub-clauses in TSB-31-D are not affected. For the changes provided in Clause 2, additions to the text are shown underlined and deletions are shown using strikeout. The new te
33、xt provided for sub-clause 14.2 in Clause 3 is a complete replacement for the existing text. Changes resulting from combining that existing text with the text previously provided in Addendum 1 are not marked. Only the additional changes made by this Addendum are shown using underlining and strikeout
34、. Likewise, the completely new Appendix F text in Clause 4 is not otherwise marked. Words that appear in underlined italics are intended as instructions to the reader. 2. MODIFICATIONS TO EXISTING TSB-31-D TEXT 2.1 Changes to clause 3, REFERENCES Add the following references to Section 3: ANSI/TIA-4
35、965-2012, Telecommunications Telephone Terminal Equipment Receive Volume Control Requirements for Digital and Analog Wireline Handset Terminals IETF RFC 3551 (2003), RTP Profile for Audio and Video Conferences with Minimal Control ITU-T Recommendation G.711 (1988-11), Pulse code modulation (PCM) of
36、voice frequencies ITU-T Recommendation G.722 (2012-09), 7 kHz audio-coding within 64 kbit/s 2.2 Changes to sub-clause 5.5, Suggested Equipment List (SEL) Modify item (74) as follows: (74) G.711 Reference codec: A zero-level encoder/decoder pair providing analog-to-digital and digital-to-analog conve
37、rsion in opposite directions of transmission in the same piece of equipment whose performance approaches the ideal characteristics for conversion to and from the bit format appropriate for the digital interface under test and meets the requirements for a zero level decoder in TIA-968-B. Characterist
38、ics such as attenuation versus frequency distortion (frequency response), idle channel noise, and quantization distortion should be considered. For example, ideal characteristics for PCM codecs are described in ITU-T Recommendation G.712. Add items 78 and 79 as follows: (78) L16-256 reference wideba
39、nd linear, sixteen bit, 256 kbit/s codec. See IETF RFC 3551 and ANSI/TIA-4965. TSB-31-D-3 2 (79) ITU-T G.722 reference wideband codec (0 dBm0 = 9 dB below full scale). 3. REPLACEMENT TEXT FOR SUB-CLAUSE 14.2 Replace sub-clause 14.2 in its entirety with the following: 14.2 Hearing Aid Compatibility -
40、 Volume Control 47 CFR, 68.317 14.2.1 Background The HAC Act required the FCC to establish regulations that would ensure reasonable access to telephone service by persons with hearing disabilities. The FCC requires hearing aid compatible telephones to provide volume control. 47 CFR, 68.317 cites ind
41、ustry standards dating back to 1987 for its volume control specification. A modified version of those requirements is discussed as an alternative method in 14.2.6. An entirely new volume control measure, known as Conversational Gain, is discussed in Appendix F. Compliance with the Conversational Gai
42、n requirements is sufficient for showing compliance with the existing 47 CFR, 68.317 requirements. The FCC has released an NPRM for adopting Conversational Gain into 47 CFR, 68.317 to replace the current receive volume control requirements. They have proposed to allow a two-year transition period af
43、ter issuance of the Report & Order during which compliance with either the old or new requirements will be acceptable. Once that transition period ends, the testing guidance provided in sub-clause 14.2 will become obsolete and only the guidance provided in the new Appendix F will apply. 14.2.2 Purpo
44、se To determine that the receive volume control of a telephone with a handset or headset meets specified requirements for loudness at its normal unamplified level and provides the required amount of gain at its maximum volume setting. Loudness is measured in terms of Receive Objective Loudness Ratin
45、g (ROLR), and gain is measured in terms of change in ROLR. Procedures are provided for both telephones with an analog interface (analog telephones) and for telephones with a digital interface (digital telephones). 14.2.3 Equipment (1) Sinewave frequency generator SEL#54. (2) Frequency selective volt
46、meter SEL#28. (3) Level recorder SEL#70. (4) Artificial ear SEL#51 for testing telephones with handsets that seal on this type of artificial ear. (5) Artificial ear SEL#69 for testing telephones with handsets that do not seal on artificial ear SEL#51. (6) Standard microphone SEL#52. (7) Microphone a
47、mplifier SEL#53. (8) Test loops or commercially available artificial loop equivalent to 2.7 km and 4.6 km #26 AWG non-loaded cable SEL#50. (9) Reference codec SEL#74. Note: Refer to subclause 5.5 for equipment details. TSB-31-D-3 3 14.2.4 Equipment States Subject To Test Normal off-hook talking cond
48、ition. 14.2.5 Test Procedure (1) Connect the telephone under test as shown in Figure 14.2-1 for analog telephones and as shown in Figure 14.2-2 for digital telephones. The reference codecs and the analog telephone / IP terminal adapter shown in these figures need to be capable of encoding or decodin
49、g analog signals with zero loss. (2) Place the handset receiver on artificial ear SEL#69 using the high leak condition specified in ANSI/TIA-470.110-C-1 for analog telephones and in ANSI/TIA-810-B for digital telephones. Alternatively, the handset receiver may be placed on artificial ear SEL#51 if a seal can be achieved between the handset surface and the rim of the artificial ear without the use of sealing putty or similar materials. (3) Use the laboratory standard pressure microphone for measuring the sound pressure generated in the artificial ear. Feed the outpu
