1、 TIA-4965 October 2012Telecommunications Telephone Terminal Equipment Receive Volume Control Requirements for Digital and Analog Wireline Handset Terminals ANSI/TIA-4965-2012 APPROVED: OCTOBER 19, 2012 REAFFIRMED: FEBRUARY 16, 2017 NOTICE TIA Engineering Standards and Publications are designed to se
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23、NEGATION OF DAMAGES IS A FUNDAMENTAL ELEMENT OF THE USE OF THE CONTENTS HEREOF, AND THESE CONTENTS WOULD NOT BE PUBLISHED BY TIA WITHOUT SUCH LIMITATIONS. ANSI/TIA-4965 i TABLE OF CONTENTS FOREWORD_ iii INTRODUCTION _ iv 1 SCOPE _ 1 2 NORMATIVE REFERENCES _ 1 3 ABBREVIATIONS, ACRONYMS, AND DEFINITIO
24、NS _ 1 3.1 ABBREVIATIONS AND ACRONYMS _ 1 3.2 DEFINITIONS _ 2 4 TECHNICAL REQUIREMENTS _ 3 4.1 GENERAL _ 3 4.1.1 Power Failure Exclusion _3 4.1.2 Adjustable Frequency Response _3 4.1.3 Acoustic Test Interface Equipment _3 4.1.4 Handset Positioning _3 4.1.5 Test Signal _3 4.2 TEST CIRCUITS FOR ANALOG
25、 TERMINAL TESTING _ 3 4.2.1 Analog Terminal Receive Testing with Artificial Lines _3 4.2.2 DC Feed Circuit _4 4.2.3 Termination Impedance _5 4.2.4 Test Signal Level _5 4.2.5 Artificial Lines _5 4.3 TEST ARRANGEMENTS FOR DIGITAL TERMINAL TESTING _ 6 4.3.1 Dual Mode Terminals _6 4.3.2 Reference Codecs
26、 _6 4.3.2.1 G.711 Reference Narrowband Codec _6 4.3.2.2 Other Narrowband Reference Codecs _7 4.3.2.3 L16-256 Reference Wideband Codec _7 4.3.2.4 Other Wideband Reference Codecs _8 4.3.3 Precautions _8 4.3.4 Test Arrangements _8 4.3.4.1 Reference Codec Arrangement _8 4.3.4.2 Direct Digital Signal Gen
27、eration Arrangement _9 4.3.5 Test Signal Level _9 4.4 RECEIVE VOLUME CONTROL PERFORMANCE _ 9 4.4.1 Requirement _9 4.4.2 Method of Measurement _9 ANNEX A (INFORMATIVE) CONVERSATIONAL GAIN _ 11 A.1 THE HAC ACT _ 11 ANSI/TIA-4965 ii A.2 CONSUMER CONFUSION _ 11 A.3 INVESTIGATION _ 12 A.4 IEEE STD 269 _
28、12 A.5 TEST SIGNAL LEVEL _ 12 A.6 CONVERSATIONAL GAIN PERFORMANCE REQUIREMENT _ 13 A.7 BENEFITS OF USING CONVERSATIONAL GAIN _ 13 TABLE OF FIGURES Figure 1 Test circuit for analog terminal receive measurements 3 Figure 2 One possible dc feed circuit . 4 Figure 3 Artificial line segment . 5 Figure 4
29、Digital Telephone Set Test Arrangement with Reference Codec 8 Figure 5 Digital Telephone Set Test Arrangement using Direct Digital Signaling 9 TABLE OF TABLES Table 1 Artificial line segment component values . 5 Table 2 Mu-Law and A-Law 0 dBm0 Periodic Sequence that produces a 1 kHz, 0.772 volt rms
30、Sine-Wave Signal 6 ANSI/TIA-4965 iii Foreword (This foreword is not part of this Standard.) This document is a TIA Telecommunications standard produced by Subcommittee TR-41.3 of Committee TR-41. This Standard was developed in accordance with TIA procedural guidelines, and represents the consensus p
31、osition of Subcommittee TR-41.3, which served as the formulating group. There is one annex in this Standard. Annex A is informative and is not considered part of this Standard. The leadership of the TR-41.3 Analog and Digital Wireline Terminals Subcommittee (Chair: James Bress, AST Technology Labs,
32、Inc.) acknowledges the written contributions provided by the following individuals in the development of this standard. Organization Representative TIA-4965 Whitesell Consulting Steve Whitesell Editor Uniden Al Baum Editor AST Technology Labs Inc. Don McKinnon Suggestions for improvement of this Sta
33、ndard are welcome. They should be sent to: Telecommunications Industry Association Engineering Department Suite 300 250 Wilson Boulevard Arlington, VA 22201 ( http:/www.tiaonline.org ) ANSI/TIA-4965 iv Introduction Volume control requirements for narrowband digital, wideband digital, and analog wire
34、line terminals are included in different industry standard documents, each with their own revision cycle. The Federal Communications Commission and Industry Canada currently reference significantly different versions of these multiple standards documents in their volume control regulations. Many ter
35、minals are designed for and marketed in both the United States and Canada. Therefore, this lack of harmonization between the regulatory agencies for the two countries could result in significant problems for manufacturers of analog and/or digital wireline terminals. The purpose of this new Standard
36、is to provide a single document that can be referenced by both the Federal Communications Commission and Industry Canada in their regulations, resulting in up-to-date and harmonized regulatory volume control requirements. If at some point in the future further research results in improved measuremen
37、t techniques or other reasons to revise the volume control criteria, the requirements of both government agencies could be quickly brought up-to-date by simply pointing to the most recent version of this Standard. ANSI/TIA-4965 1 Telephone Terminal Equipment Receive Volume Control Requirements for D
38、igital and Analog Wireline Handset Terminals 1 SCOPE This Standard establishes handset receive volume control requirements and testing methods for narrowband digital, wideband digital, and analog wireline terminals. 2 NORMATIVE REFERENCES The following standards contain provisions, which, through re
39、ference in this text, constitute provisions of this Standard. At the time of publication, the editions indicated were valid. All standards are subject to revision, and parties to agreements based on this Standard are encouraged to investigate the possibility of applying the most recent editions of t
40、he standards indicated below. ANSI and TIA maintain registers of currently valid national standards published by them. 1. ANSI/IEEE Std 269-2010 IEEE Standard Methods for Measuring Transmission Performance of Analog and Digital Telephone Sets, Handsets, and Headsets 2. IEEE Std 1652-2008 - IEEE Stan
41、dard for the Application of Free Field Acoustic Reference to Telephony Measurements 3. ITU-T Recommendation G.711 (1988) Pulse code modulation (PCM) of voice frequencies 4. ITU-T Recommendation P.57 (2011) Artificial ears 5. ITU-T Recommendation P.58 (2011) Head and torso simulator for telephonometr
42、y 3 ABBREVIATIONS, ACRONYMS, AND DEFINITIONS 3.1 ABBREVIATIONS AND ACRONYMS For the purposes of this Standard, the following abbreviations and acronyms apply. AWG American Wire Gauge DRP Drum Reference Point HATS Head and Torso Simulator L16-256 Linear, Sixteen Bit, 256 kbit/s Codec PBX Private Bran
43、ch Exchange PCM Pulse Code Modulation RLR Receive Loudness Rating ROLR Receive Objective Loudness Rating TLP Transmission Level Point ANSI/TIA-4965 2 3.2 DEFINITIONS For the purposes of this Standard, the following definitions apply. Conversational Gain: The level of an acoustic output from a telephone relative to the acoustic level that would be present in a face-to-face conversation at a distance of 1 meter. This reference acoustic level for
