1、 TIA-470.132 December 2013Telecommunications Telephone Terminal Equipment Transmission Requirements for Wideband Analog Telephones with Headsets ANSI/TIA-470.132- 2013 APPROVED: DECEMBER 2, 2013 NOTICE TIA Engineering Standards and Publications are designed to serve the public interest through elimi
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6、 use. (From Standards Proposal No. ANSI/TIA-PN-470.132-D1, formulated under the cognizance of the TIA TR-41 User Premises Telecommunications Requirements, TR-41.3 Subcommittee on Analog and Digital Wireline Terminals. . Published by TELECOMMUNICATIONS INDUSTRY ASSOCIATION Technology (b) there is no
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19、GES IS A FUNDAMENTAL ELEMENT OF THE USE OF THE CONTENTS HEREOF, AND THESE CONTENTS WOULD NOT BE PUBLISHED BY TIA WITHOUT SUCH LIMITATIONS.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-470.132 i TABLE OF CONTENTS FOREWORD . v INTRODUCTION vi 1 SCOPE 1 2 NORMATIVE REFERENCES 2 3 ABBREVIATIONS, ACRONYMS, AND DEFINITIONS 3 3.1 ABBREVIATIO
20、NS AND ACRONYMS . 3 3.2 DEFINITIONS 4 4 TESTING CONSIDERATIONS 5 4.1 GENERAL 5 4.1.1 Acoustic Test Interface Equipment . 5 4.1.2 Test Signals . 5 4.1.3 Test Position 5 4.1.4 Test Methods . 5 4.1.5 Test Points and Range of Requirements . 5 4.1.6 Subjective Tests . 5 4.2 TEST CIRCUITS 6 4.2.1 Send Tes
21、ting 6 4.2.2 Receive Testing 6 4.2.3 Sidetone Testing 6 4.2.4 DC Feed Circuit . 6 4.2.5 Termination Impedance 7 4.2.6 Source Impedance 7 5 TECHNICAL REQUIREMENTS 8 5.1 CATEGORIES OF CRITERIA . 8 5.2 SEND PERFORMANCE . 9 5.2.1 Send Frequency Response 9 5.2.2 Send Loudness Rating (SLR) . 10 5.2.3 Send
22、 Distortion 10 5.2.4 Send Noise On-Hook 12 5.2.5 Send Noise Off-Hook 12 5.2.6 Send Noise Off-Hook Single Frequency Interference 13 5.2.7 Send Muting 13 5.3 RECEIVE PERFORMANCE 14 5.3.1 Determination of Nominal Volume Control Setting 14 5.3.2 Receive Frequency Response . 14 5.3.3 Receive Loudness Rat
23、ing (RLR) 15 5.3.4 Receive Distortion . 16 5.3.5 Receive Noise Off-Hook . 18 5.3.6 Receive Noise Off-Hook Single Frequency Interference 18 5.4 SIDETONE PERFORMANCE 20 5.4.1 Sidetone Masking Rating (STMR) . 20 ANSI/TIA-470.132 ii 5.4.2 Sidetone Delay . 20 5.5 ADDITIONAL PERFORMANCE PARAMETERS . 21 5.
24、5.1 Acoustic Stability . 21 ANNEX A (NORMATIVE) A-WEIGHTING CURVE 23 ANNEX B (NORMATIVE) CALCULATION OF LOUDNESS RATINGS 24 B.1 SEND LOUDNESS RATING: . 24 B.2 RECEIVE LOUDNESS RATING: 25 B.3 SIDETONE MASKING RATING: 25 ANNEX C (NORMATIVE) ISO FREQUENCIES 27 ANNEX D (INFORMATIVE) DETERMINATION OF NOM
25、INAL LOUDNESS RATING VALUES . 29 D.1 ANALYSIS OF EFFECTS OF TEST CONFIGURATION DIFFERENCES 29 D.2 APPLICATION TO LOUDNESS RATING VALUES . 32 ANNEX E (INFORMATIVE) LOSS PLAN AND LOUDNESS RATING REFERENCES AND HIERARCHY . 34 ANNEX F (INFORMATIVE) BIBLIOGRAPHY 35 ANSI/TIA-470.132 iii TABLE OF FIGURES F
26、igure 1 Test circuit for send measurements . 6 Figure 2 Test circuit for receive measurements . 6 Figure 3 Test circuit for sidetone measurements 6 Figure 4 One possible dc feed circuit 7 Figure 5 Send frequency response limits . 10 Figure 6 Receive frequency response limits 15 Figure 7 Reference Co
27、rner Jig (RCJ) for stability testing. 21 Figure 8 Headset stability test orientation #1 . 22 Figure 9 Headset stability test orientation #2 . 22 Figure A.1 A-weighting curve 23 Figure D.1 Send test configurations 30 Figure D.2 Receive test configurations 30 Figure D.3 Test configuration loop loss ef
28、fects . 32 Figure D.4 SLR calculation example. 33 Figure D.5 RLR calculation example 33 Figure E.1 Hierarchical relationship between loudness rating and loss plan standards 34 ANSI/TIA-470.132 iv TABLE OF TABLES Table 1 Send frequency response limits 9 Table 2 Limits for send SDNR vs frequency . 11
29、Table 3 Limits for send SDNR vs level . 11 Table 4 Send SDNR stimulus center frequencies and band limits 12 Table 5 Send SDNR analysis notch frequency band 12 Table 6 Receive frequency response limits 15 Table 7 Limits for receive SDNR vs frequency . 16 Table 8 Limits for receive SDNR vs level . 17
30、Table 9 Receive SDNR stimulus center frequencies and band limits 17 Table 10 Receive SDNR analysis notch frequency band 17 Table 11 Reference corner headset placement for stability test 22 Table A.1 A-weighting curve 23 Table B.1 ITU-T P.79 Tables A.2 and 3, Weighting factors for calculating loudnes
31、s ratings 26 Table C.1 ISO R-40, ISO R-10,1/12th Octave and 1/3rd Octave Frequencies 27 Table D.1 Test configuration loop loss effects. 31 ANSI/TIA-470.132 v Foreword (This foreword is not part of this standard.) This document is a TIA Telecommunications standard produced by Working Group TR-41.3.5
32、of Committee TR-41. This standard was developed in accordance with TIA procedural guidelines, and represents the consensus position of the Working Group and its parent Subcommittee TR-41.3, which served as the formulating group. There are six annexes in this Standard. Annexes A, B, and C are normati
33、ve and are considered part of this Standard. Annexes D, E, and F are informative and are not considered part of this Standard. Copyrighted parts of ITU-T Recommendation P.79 are used with permission of the ITU. The ITU owns the copyright for the ITU Recommendations. Copyrighted parts of ISO 3 are us
34、ed with permission of the ISO. The ISO owns the copyright for the ISO Standards. The leadership of the TR-41.3.5 Analog Telephone Transmission Performance Working Group (Chair Stephen R Whitesell, Whitesell Consulting LLC) acknowledges the written contributions provided by the following individuals
35、in the development of this standard. Organization Representative TIA-470.132 Consultant to Microsemi Corp Stephen R Whitesell Editor AST Technology Labs James Bress AST Technology Labs Don McKinnon Cisco Systems Tim Lawler Industry Canada Jason Nixon Industry Canada Magdoly Rondn Microsemi Corporati
36、on Gilbert Amine Microsemi Corporation Dave Chabinec Suggestions for improvement of this standard are welcome. They should be sent to: Telecommunications Industry Association Engineering Department Suite 200 1320 North Courthouse Road Arlington, VA 22201 ( http:/www.tiaonline.org ) ANSI/TIA-470.132
37、vi Introduction Analog telephones have traditionally been designed for transmitting and receiving audio in the 300 to 3400 Hz frequency range for legacy PSTN reasons. These telephones are increasing being used with wideband-capable residential gateways that can deliver VoIP-based telephony in the 50
38、 to 7000 Hz frequency range. Wideband telephony offers greater audio clarity and could enable new services such as streaming audio or enhanced speech recognition. The lack of standards for wideband analog telephony has given rise to a chicken and egg situation whereby gateway manufacturers are waiti
39、ng for wideband telephones to become available in order to offer this feature and terminal manufacturers are not developing wideband telephones for the lack of wideband voice gateways with which they can operate. This document is one of a group of standards intended to help resolve the issue. This S
40、tandard provides wideband transmission requirements for telephones equipped with headsets. Companion documents in the ANSI/TIA-470.1X2 series provide corresponding wideband transmission requirements for telephones equipped with handsets and speakerphones. ANSI/TIA-470.132 1 Telephone Terminal Equipm
41、ent Transmission Requirements for Wideband Analog Telephones with Headsets 1 SCOPE This standard provides acoustic transmission performance requirements for headset equipped analog telephones intended for connection to terminal adapters and voice gateways that provide wideband speech using packet-ba
42、sed services such as Voice over Internet Protocol (VoIP). These services are often referred to as high definition or HD voice services. The specification range for this standard is 100 to 8000 Hz, but for practical reasons the actual audio bandwidth of covered devices is typically about 150 to 6800
43、Hz. The terminal adapters and voice gateways used to provide HD voice services normally present 600 ohm impedances and are connected to the wideband telephone with very short lengths of cabling. If the wideband telephone with headset is likely to be used in applications where it may also be connecte
44、d to narrowband voice services, such as the public switched telephone network (PSTN), that provide 900 ohm impedances and may use significant lengths of loop (cabling), then evaluation for compliance with the latest version of the ANSI/TIA-470.130 standard for narrowband analog telephones with heads
45、ets is suggested. The requirements in this standard apply to the headset and terminal taken together. They are not intended to be a specification for a headset as a component separate from the terminal with which it is used. ANSI/TIA-470.132 2 2 NORMATIVE REFERENCES The following standards contain p
46、rovisions, which, through reference 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 t
47、he most recent editions of the standards indicated below. ANSI and TIA maintain registers of currently valid national standards published by them. 1. ANSI S1.4-1983 (R 2006), Specification for Sound Level Meters 2. IEEE Std 269-2010, IEEE Standard Methods for Measuring Transmission Performance of An
48、alog and Digital Telephone Sets, Handsets, and Headsets 3. ISO 3: 1973, Preferred Numbers - Series of Preferred Numbers 4. ITU-T Recommendation P.57 (12/2011), Artificial Ears 5. ITU-T Recommendation P.58 (12/2011), Head and Torso Simulator for Telephonometry 6. ITU-T Recommendation P.79 (11/2007),
49、Calculation of Loudness Ratings for Telephone Sets ANSI/TIA-470.132 3 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 ERP Ear Reference Point ETSI European Telecommunications Standards Institute HATS Head And Torso Simulator ITU International Telecommunications Union MRP Mouth Reference Point OLR Overall Loudness Rating PSTN
