1、 TIA-470.122 December 2013Telecommunications Telephone Terminal Equipment Transmission Requirements for Wideband Analog Telephones with Speakerphones ANSI/TIA-470.122- 2013 APPROVED: NOVEMBER 26, 2013 NOTICE TIA Engineering Standards and Publications are designed to serve the public interest through
2、 eliminating misunderstandings between manufacturers and purchasers, facilitating interchangeability and improvement of products, and assisting the purchaser in selecting and obtaining with minimum delay the proper product for their particular need. The existence of such Standards and Publications s
3、hall not in any respect preclude any member or non-member of TIA from manufacturing or selling products not conforming to such Standards and Publications. Neither shall the existence of such Standards and Publications preclude their voluntary use by Non-TIA members, either domestically or internatio
4、nally. Standards and Publications are adopted by TIA in accordance with the American National Standards Institute (ANSI) patent policy. By such action, TIA does not assume any liability to any patent owner, nor does it assume any obligation whatever to parties adopting the Standard or Publication. T
5、his Standard does not purport to address all safety problems associated with its use or all applicable regulatory requirements. It is the responsibility of the user of this Standard to establish appropriate safety and health practices and to determine the applicability of regulatory limitations befo
6、re its use. (From Standards Proposal No. ANSI/TIA-PN-470.122-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
7、is no assurance that the Document will be approved by any Committee of TIA or any other body in its present or any other form; (c) the Document may be amended, modified or changed in the standards development or any editing process. The use or practice of contents of this Document may involve the us
8、e of intellectual property rights (“IPR”), including pending or issued patents, or copyrights, owned by one or more parties. TIA makes no search or investigation for IPR. When IPR consisting of patents and published pending patent applications are claimed and called to TIAs attention, a statement fr
9、om the holder thereof is requested, all in accordance with the Manual. TIA takes no position with reference to, and disclaims any obligation to investigate or inquire into, the scope or validity of any claims of IPR. TIA will neither be a party to discussions of any licensing terms or conditions, wh
10、ich are instead left to the parties involved, nor will TIA opine or judge whether proposed licensing terms or conditions are reasonable or non-discriminatory. TIA does not warrant or represent that procedures or practices suggested or provided in the Manual have been complied with as respects the Do
11、cument or its contents. If the Document contains one or more Normative References to a document published by another organization (“other SSO”) engaged in the formulation, development or publication of standards (whether designated as a standard, specification, recommendation or otherwise), whether
12、such reference consists of mandatory, alternate or optional elements (as defined in the TIA Engineering Manual, 4thedition) then (i) TIA disclaims any duty or obligation to search or investigate the records of any other SSO for IPR or letters of assurance relating to any such Normative Reference; (i
13、i) TIAs policy of encouragement of voluntary disclosure (see Engineering Manual Section 6.5.1) of Essential Patent(s) and published pending patent applications shall apply; and (iii) Information as to claims of IPR in the records or publications of the other SSO shall not constitute identification t
14、o TIA of a claim of Essential Patent(s) or published pending patent applications. TIA does not enforce or monitor compliance with the contents of the Document. TIA does not certify, inspect, test or otherwise investigate products, designs or services or any claims of compliance with the contents of
15、the Document. ALL WARRANTIES, EXPRESS OR IMPLIED, ARE DISCLAIMED, INCLUDING WITHOUT LIMITATION, ANY AND ALL WARRANTIES CONCERNING THE ACCURACY OF THE CONTENTS, ITS FITNESS OR APPROPRIATENESS FOR A PARTICULAR PURPOSE OR USE, ITS MERCHANTABILITY AND ITS NONINFRINGEMENT OF ANY THIRD PARTYS INTELLECTUAL
16、 PROPERTY RIGHTS. TIA EXPRESSLY DISCLAIMS ANY AND ALL RESPONSIBILITIES FOR THE ACCURACY OF THE CONTENTS AND MAKES NO REPRESENTATIONS OR WARRANTIES REGARDING THE CONTENTS COMPLIANCE WITH ANY APPLICABLE STATUTE, RULE OR REGULATION, OR THE SAFETY OR HEALTH EFFECTS OF THE CONTENTS OR ANY PRODUCT OR SERV
17、ICE REFERRED TO IN THE DOCUMENT OR PRODUCED OR RENDERED TO COMPLY WITH THE CONTENTS. TIA SHALL NOT BE LIABLE FOR ANY AND ALL DAMAGES, DIRECT OR INDIRECT, ARISING FROM OR RELATING TO ANY USE OF THE CONTENTS CONTAINED HEREIN, INCLUDING WITHOUT LIMITATION ANY AND ALL INDIRECT, SPECIAL, INCIDENTAL OR CO
18、NSEQUENTIAL DAMAGES (INCLUDING DAMAGES FOR LOSS OF BUSINESS, LOSS OF PROFITS, LITIGATION, OR THE LIKE), WHETHER BASED UPON BREACH OF CONTRACT, BREACH OF WARRANTY, TORT (INCLUDING NEGLIGENCE), PRODUCT LIABILITY OR OTHERWISE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. THE FOREGOING NEGATION O
19、F 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-470.122 i TABLE OF CONTENTS FOREWORD . v INTRODUCTION vi 1 SCOPE 1 2 NORMATIVE REFERENCES 2 3 ABBREVIATIONS, ACRONYMS, AND DEFINITIONS 3 3.1 ABBRE
20、VIATIONS AND ACRONYMS 3 3.2 DEFINITIONS 4 4 TESTING CONSIDERATIONS 5 4.1 GENERAL . 5 4.1.1 Acoustic Test Environment and Equipment 5 4.1.2 Test Signals 5 4.1.3 Test Measurement Resolution. 5 4.1.4 Test Positions . 5 4.1.5 Test Methods . 8 4.1.6 Test Points and Range of Requirements 8 4.1.7 Subjectiv
21、e Tests . 8 4.2 TEST CIRCUITS 9 4.2.1 Send Testing Circuit . 9 4.2.2 Receive Testing Circuit 9 4.2.3 DC Feed Circuit . 9 4.2.4 Termination Impedance 10 4.2.5 Source Impedance 10 5 TECHNICAL REQUIREMENTS . 11 5.1 CATEGORIES OF CRITERIA . 11 5.2 SEND PERFORMANCE . 12 5.2.1 Send Frequency Response 12 5
22、.2.2 Send Output Magnitude . 14 5.2.3 Send Directionality . 15 5.2.4 Send Distortion 16 5.2.5 Send Noise On-Hook 17 5.2.6 Send Noise Off-Hook 18 5.2.7 Send Noise Off-Hook Single Frequency Interference . 18 5.2.8 Send Muting . 19 5.3 RECEIVE PERFORMANCE 20 5.3.1 Determination of Nominal Volume Contro
23、l Setting . 20 5.3.2 Receive Frequency Response 20 5.3.3 Receive Output Magnitude . 22 ANSI/TIA-470.122 ii 5.3.4 Receive Volume Control Conversational Gain . 23 5.3.5 Receive Volume Control Range 23 5.3.6 Receive Directionality. 24 5.3.7 Receive Distortion 24 5.3.8 Receive Distortion at Maximum Volu
24、me Control Setting 26 5.3.9 Receive Noise Off-Hook . 26 5.3.10 Receive Noise Off-Hook Single Frequency Interference . 27 ANNEX A (NORMATIVE) A-WEIGHTING NOISE CURVE 28 ANNEX B (NORMATIVE) CALCULATION OF LOUDNESS RATINGS 29 B.1 SEND LOUDNESS RATING: 29 B.2 RECEIVE LOUDNESS RATING: 30 B.3 SIDETONE MAS
25、KING RATING (HANDSET): . 30 ANNEX C (NORMATIVE) ISO R10 FREQUENCIES 32 ANNEX D (INFORMATIVE) DETERMINATION OF NOMINAL LOUDNESS RATING VALUES 33 D.1 ANALYSIS OF EFFECTS OF TEST CONFIGURATION DIFFERENCES. 33 D.2 APPLICATION TO LOUDNESS RATING VALUES . 36 ANNEX E (INFORMATIVE) LOSS PLAN AND LOUDNESS RA
26、TING REFERENCES AND HIERARCHY 38 ANNEX F (INFORMATIVE) BIBLIOGRAPHY . 39 ANNEX G (INFORMATIVE) ITEMS FOR FUTURE CONSIDERATION . 40 G.1 VOICE SWITCHING PERFORMANCE . 40 G.2 ACOUSTIC ECHO CANCELLER PERFORMANCE . 40 G.3 DYNAMIC SEND BACKGROUND NOISE SUPPRESSION 41 G.4 SWITCHING OPERATION BETWEEN SPEAKE
27、RPHONE & HANDSET MODE 41 ANSI/TIA-470.122 iii TABLE OF FIGURES Figure 1 Test position setup for send measurements . 5 Figure 2 Speakerphone send directionality measurement setup . 6 Figure 3 Test position setup for receive measurements . 7 Figure 4 Speakerphone receive directionality measurement set
28、up . 8 Figure 5 Test circuit for send measurements 9 Figure 6 Test circuit for receive measurements 9 Figure 7 One possible dc feed circuit . 10 Figure 8 Send frequency response limits 14 Figure 9 Receive frequency response limits 22 Figure A.1 A-weighting noise weighting curve . 28 Figure D.1 Send
29、test configurations . 34 Figure D.2 Receive test configurations 34 Figure D.3 Test configuration loop loss effects 36 Figure D.4 SLR calculation example . 37 Figure D.5 RLR calculation example. 37 Figure E.1 Hierarchical relationship between loudness rating and loss plan standards . 38 ANSI/TIA-470.
30、122 iv TABLE OF TABLES Table 1 Send frequency response limits . 13 Table 2 Send directionality limits. . 15 Table 3 Limits for send SDNR vs frequency 16 Table 4 Limits for send SDNR vs level 16 Table 5 Send SDNR stimulus center frequencies and band limits . 17 Table 6 Send SDNR analysis notch freque
31、ncy band . 17 Table 7 Receive frequency response limits . 21 Table 8 Receive directionality limits. . 24 Table 9 Limits for receive SDNR vs frequency 25 Table 10 Limits for receive SDNR vs level 25 Table 11 Receive SDNR stimulus center frequencies and band limits . 26 Table 12 Receive SDNR analysis
32、notch frequency band 26 Table A.1 A-weighting curve 28 Table B-1 ITU-T P.79 Tables A.2 and 3, Weighting factors for calculating loudness ratings 31 Table C-1 1/3rd octave and ISO R10 frequencies . 32 Table D.1 Test configuration loop loss effects . 35 ANSI/TIA-470.122 v Foreword (This foreword is no
33、t 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 accordance with TIA procedural guidelines, and represents the consensus position of the Working Group and its parent Subcommittee TR-41.
34、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. Annexes 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
35、 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 the copyright for the ISO Standards. The leadership of the TR-41.3.5 Analog Telephone Transmission Performance Working Group (Chair: Steph
36、en R Whitesell, Whitesell Consulting LLC) acknowledges the written contributions provided by the following individuals in the development of this standard. Organization Representative TIA-470.122 Consultant to Microsemi Corp Stephen R Whitesell Editor AST Technology Labs James Bress AST Technology L
37、abs Don McKinnon Cisco Systems Tim Lawler Industry Canada Jason Nixon Industry Canada Magdoly Rondn Microsemi Corporation Gilbert Amine Microsemi Corporation Dave Chabinec Suggestions for improvement of this standard are welcome. They should be sent to: Telecommunications Industry Association Engine
38、ering Department Suite 200 1320 North Courthouse Road Arlington, VA 22201 ( http:/www.tiaonline.org ) ANSI/TIA-470.122 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 telephon
39、es are increasingly being used with wideband-capable residential gateways that can deliver VoIP-based 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 stan
40、dards for wideband analog telephony has given rise to a chicken and egg situation whereby gateway 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 gate
41、ways with which they can operate. This document is one of a group of standards intend to help resolve the issue. This Standard provides wideband transmission requirements for telephones equipped with speakerphones. Companion documents in the ANSI/TIA-470.1X2 series provide corresponding transmission
42、 requirements for telephones equipped with handsets and headsets. ANSI/TIA-470.122 1 Telephone Terminal Equipment Transmission Requirements for Wideband Analog Telephones with Speakerphones 1 SCOPE This standard provides acoustic transmission performance requirements for speakerphone equipped analog
43、 telephones intended for connection to terminal adapters and voice gateways that provide wideband 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
44、 100 to 8000 Hz, but for practical reasons the actual audio bandwidth of covered devices is typically about 150 to 6800 Hz. This standard is limited to single housing speakerphones intended for use on a desk or table by a single user at a distance of one half meter or closer. The terminal adapters a
45、nd 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 be connected to narrowband voice services, such as
46、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-470.120 standard for narrowband analog telephones with speakerphones is suggested. ANSI/TIA-470.122
47、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 parties to agreements based on this standard a
48、re 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 (R2006) American National Standard Specification for Sound Level Meters 2. AN
49、SI/ASA S1.15-1997 Part 1 (R2011) American National Standard Measurement Microphones, Part 1: Specifications for Laboratory Standard Microphones 3. IEEE Std 269-2010 IEEE Standard Methods for Measuring Transmission Performance of Analog and Digital Telephone Sets, Handsets, and Headsets 4. IEEE Std 1329-2010 IEEE Standard Method for Measuring Transmission Performance of Speakerphones 5. ISO 3: 1973, Preferred Numbers - Series of Preferred Numbers 6. ITU-T Recommendatio
