1、 TIA-470.112 December 2013Telecommunications Telephone Terminal Equipment Transmission Requirements for Wideband Analog Telephones with Handsets ANSI/TIA-470.112- 2013 APPROVED: NOVEMBER 26, 2013 NOTICE TIA Engineering Standards and Publications are designed to serve the public interest through elim
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6、s use. (From Standards Proposal No. ANSI/TIA-PN-470.112-D2, 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19、AGES IS A FUNDAMENTAL ELEMENT OF THE USE OF THE CONTENTS HEREOF, AND THESE CONTENTS WOULD NOT BE PUBLISHED BY TIA WITHOUT SUCH LIMITATIONS.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-470.112 i TABLE OF CONTENTS FOREWORD . v INTRODUCTION vi 1 SCOPE 1 2 NORMATIVE REFERENCES 2 3 ABBREVIATIONS, ACRONYMS, AND DEFINITIONS 3 3.1 ABBREVIATI
20、ONS 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 Te
21、sting 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 Sen
22、d 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 Ra
23、ting (RLR) 15 5.3.4 Receive Volume Control Conversational Gain 16 5.3.5 Receive Distortion . 17 5.3.6 Receive Distortion Maximum Volume Control Setting . 18 5.3.7 Receive Noise Off-Hook . 18 5.3.8 Receive Noise Off-Hook Single Frequency Interference 19 5.4 SIDETONE PERFORMANCE 20 ANSI/TIA-470.112 ii
24、 5.4.1 Sidetone Masking Rating (STMR) . 20 5.4.2 Sidetone Delay . 20 5.5 ADDITIONAL PERFORMANCE PARAMETERS . 21 5.5.1 Acoustic Stability . 21 5.5.2 Magnetic Field for Hearing Aid Coupling 23 ANNEX A (NORMATIVE) A-WEIGHTING CURVE 24 ANNEX B (NORMATIVE) CALCULATION OF LOUDNESS RATINGS 25 B.1 SEND LOUD
25、NESS RATING: . 25 B.2 RECEIVE LOUDNESS RATING: 26 B.3 SIDETONE MASKING RATING: 26 ANNEX C (NORMATIVE) ISO FREQUENCIES 28 ANNEX D (INFORMATIVE) DETERMINATION OF NOMINAL LOUDNESS RATING VALUES . 30 D.1 ANALYSIS OF EFFECTS OF TEST CONFIGURATION DIFFERENCES 30 D.2 APPLICATION TO LOUDNESS RATING VALUES .
26、 33 ANNEX E (INFORMATIVE) LOSS PLAN AND LOUDNESS RATING REFERENCES AND HIERARCHY . 35 ANNEX F (INFORMATIVE) OTHER PARAMETERS THAT MAY INFLUENCE PRODUCT PERFORMANCE. 36 ANNEX G (INFORMATIVE) BIBLIOGRAPHY 37 ANSI/TIA-470.112 iii TABLE OF FIGURES Figure 1 Test circuit for send measurements . 6 Figure 2
27、 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 Corner Jig (RCJ) for stability testing. 21 Figure 8 Stabi
28、lity face down orientation (#1) test 22 Figure 9 Stability on side orientation (#2) test . 22 Figure A.1 A-weighting curve 24 Figure D.1 Send test configurations 31 Figure D.2 Receive test configurations 31 Figure D.3 Test configuration loop loss effects . 33 Figure D.4 SLR calculation example. 34 F
29、igure D.5 RLR calculation example 34 Figure E.1 Hierarchical relationship between loudness rating and loss plan standards 35 ANSI/TIA-470.112 iv TABLE OF TABLES Table 1 Send frequency response limits 9 Table 2 Limits for send SDNR vs frequency . 11 Table 3 Limits for send SDNR vs level . 11 Table 4
30、Send SDNR stimulus center frequencies and band limits 11 Table 5 Send SDNR analysis notch frequency band 12 Table 6 Receive frequency response limits 15 Table 7 Limits for receive SDNR vs frequency . 17 Table 8 Limits for receive SDNR vs level . 17 Table 9 Receive SDNR stimulus center frequencies an
31、d band limits 18 Table 10 Receive SDNR analysis notch frequency band 18 Table 11 Reference corner handset placement for stability test 22 Table A.1 A-weighting curve 24 Table B.1 ITU-T P.79 Tables A.2 and 3, Weighting factors for calculating loudness ratings 27 Table C.1 ISO R-40, ISO R-10, 1/12th o
32、ctave and 1/3rd octave frequencies 28 Table D.1 Test configuration loop loss effects. 32 ANSI/TIA-470.112 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 of Committee TR-41. This standard was developed in
33、 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 seven annexes in this Standard. Annexes A, B, and C are normative and are considered part of this Standard. Ann
34、exes D, E, F, and G 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 used with permission of the ISO. The ISO owns t
35、he 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 in the development of this standard. Organiza
36、tion Representative TIA-470.112 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 Corporation Gilbert Amine Microsemi Corporation Dave C
37、habinec Technology Access Program Gallaudet University Linda Kozma-Spytek 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.or
38、g ) ANSI/TIA-470.112 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 increasingly being used with wideband-capable residential gateways that can deliver VoIP-ba
39、sed telephony in the 50 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
40、manufacturers are waiting 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 re
41、solve the issue. This Standard provides wideband transmission requirements for telephones equipped with handsets. Companion documents in the ANSI/TIA-470.1X2 series provide corresponding wideband transmission requirements for telephones equipped with speakerphones and headsets. ANSI/TIA-470.112 1 Te
42、lephone Terminal Equipment Transmission Requirements for Wideband Analog Telephones with Handsets 1 SCOPE This standard provides acoustic transmission performance requirements for handset equipped analog telephones intended for connection to terminal adapters and voice gateways that provide wideband
43、 speech using packet-based 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 typic
44、ally about 150 to 6800 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 is likely to be used in applications where it may also b
45、e connected 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-470.110 standard for narrowband analog telephones
46、with handsets is suggested. ANSI/TIA-470.112 2 2 NORMATIVE REFERENCES The following standards contain provisions 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 pa
47、rties to agreements based on this Standard are encouraged to investigate the possibility of applying the 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
48、 Level Meters 2. ANSI/TIA-1083-A-2010, Telecommunications Telephone Terminal Equipment Handset Magnetic Measurement Procedures and Performance Requirements 3. IEEE Std 269-2010, IEEE Standard Methods for Measuring Transmission Performance of Analog and Digital Telephone Sets, Handsets, and Headsets
49、4. IEEE Std 1652-2008, IEEE Standard for the Application of Free Field Acoustic Reference to Telephony Measurements 5. ISO 3: 1973, Preferred Numbers - Series of Preferred Numbers 6. ITU-T Recommendation P.57 (12/2011), Artificial Ears 7. ITU-T Recommendation P.58 (12/2011), Head and Torso Simulator for Telephonometry 8. ITU-T Recommendation P.79 (11/2007), Calculation of Loudness Ratings for Telephone Sets ANSI/TIA-470.112 3 3 ABBREVIATIONS, ACRONYMS, AND DEFINITIONS
