1、 TIA DOCUMENT Telecommunications Telephone Terminal Equipment Transmission Requirements for Wideband Digital Wireline Telephones TIA-920 DECEMBER 2002 TELECOMMUNICATIONS INDUSTRY ASSOCIATION The Telecommunications Industry Association represents the communications sector of Copyright Telecommunicati
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7、gton, VA 22201 U.S.A. (From Project No. 3-4705, formulated under the cognizance of the TIA TR-41.3 Subcommittee on Analog and Digital Wireline Terminals.) Published by TELECOMMUNICATIONS INDUSTRY ASSOCIATION 2002 Standards & Technology Department 2500 Wilson Boulevard Arlington, VA 22201 U.S.A. PRIC
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20、HE CONTENTS HEREOF, AND THESE CONTENTS WOULD NOT BE PUBLISHED BY TIA WITHOUT SUCH LIMITATIONS. Copyright Telecommunications Industry Association Provided by IHS under license with EIANot for ResaleNo reproduction or networking permitted without license from IHS-,-,-TIA-920 i TABLE OF CONTENTS 1. INT
21、RODUCTION . 1 2. SCOPE 2 2.1. LIMITS OF APPLICABILITY 2 2.2. CATEGORIES OF CRITERIA . 2 2.3. ENVIRONMENTAL 2 2.4. SAFETY2 3. NORMATIVE REFERENCES 3 4. DEFINITIONS, ABBREVIATIONS AND ACRONYMS . 4 4.1. CODEC . 4 4.2. EAR REFERENCE POINT (ERP) 4 4.3. HATS POSITION 4 4.4. MOUTH REFERENCE POINT (MRP) 4 4
22、.5. REFERENCE VOLUME CONTROL SETTING 4 4.6. SESSION DESCRIPTION PROTOCOL (SDP). 4 4.7. SOUND PRESSURE LEVELS . 4 4.8. ELECTRIC POWER AND NOISE LEVELS . 5 4.9. ABBREVIATIONS AND ACRONYMS 5 5. TEST METHODS, PRECAUTIONS AND CAVEATS. 6 5.1. REFERENCE CODEC . 6 5.2. DIRECT DIGITAL PROCESSING . 7 5.3. TES
23、T SIGNALS 7 5.3.1. Choice of Test Signal 7 5.3.2. Frequency Tolerance of Test Signals and Analysis 7 5.4. TESTING MODE. 8 5.5. PRECAUTIONS. 8 6. BASIC REQUIREMENTS . 9 6.1. VOICE CODING MANDATORY REQUIREMENTS . 9 6.1.1. Transmission Format of L16-256 Codec 9 6.1.2. Overload Point 9 6.1.3. Quiet Code
24、 and Full Scale Code . 9 6.1.4. 0 dBm0 (Digital Milliwatt) . 10 7. HANDSET TECHNICAL REQUIREMENTS. 11 7.1. HANDSET FREQUENCY RESPONSE 11 7.1.1. Handset Send Frequency Response 11 7.1.2. Handset Receive Frequency Response 13 7.2. HANDSET WIDEBAND LOUDNESS RATINGS AND RECEIVE VOLUME CONTROL 15 7.2.1.
25、Handset Wideband Send Loudness Rating (SLR) 15 7.2.2. Handset Wideband Receive Loudness Rating (RLR). 15 7.2.3. Handset Minimum Volume Control Range 15 Copyright Telecommunications Industry Association Provided by IHS under license with EIANot for ResaleNo reproduction or networking permitted withou
26、t license from IHS-,-,-TIA-920 ii 7.2.4. Handset Talker Sidetone (STMR) .15 7.3. HANDSET NOISE .16 7.3.1. Handset Send Noise.16 7.3.2. Handset Send Single Frequency Interference16 7.3.3. Handset Overall Receive Noise.17 7.3.4. Handset Receive Single Frequency Interference.17 7.4. HANDSET RECEIVE COM
27、FORT NOISE (ADVISORY) .17 7.4.1. General 17 7.4.2. Measurement Method 18 7.4.3. Requirement.18 7.5. HANDSET DISTORTION AND NOISE .18 7.5.1. Handset Send Distortion and Noise.18 7.5.2. Handset Receive Distortion and Noise19 7.6. WEIGHTED TERMINAL COUPLING LOSS (TCLW).20 7.6.1. Measurement Method 20 7
28、.6.2. Requirements.21 7.7. STABILITY LOSS .22 7.7.1. Measurement Method 22 7.7.2. Requirement.23 7.8. LONG DURATION MAXIMUM ACOUSTIC PRESSURE (STEADY STATE INPUT) .23 7.8.1. General 23 7.8.2. Measurement Method 23 7.8.3. Requirements.24 7.9. SHORT DURATION MAXIMUM ACOUSTIC PRESSURE (PEAK) 24 7.9.1.
29、General 24 7.9.2. Measurement Method 24 7.9.3. Requirements.25 7.10. PACKET VOICE LATENCY (ADVISORY) .25 7.10.1. Handset Send Latency 25 7.10.2. Handset Receive Latency .26 8. HEADSET TECHNICAL REQUIREMENTS27 8.1. HEADSET FREQUENCY RESPONSE .27 8.1.1. Headset Send Frequency Response .27 8.1.2. Heads
30、et Receive Frequency Response 29 8.2. HEADSET LOUDNESS RATINGS 31 8.2.1. Headset Send Loudness Rating .31 8.2.2. Headset Receive Loudness Rating.31 8.2.3. Headset Talker Sidetone31 8.3. HEADSET NOISE32 8.3.1. Headset Send Noise.32 8.3.2. Headset Send Single Frequency Interference32 8.3.3. Headset Re
31、ceive Noise 33 8.3.4. Headset Receive Single Frequency Interference .33 8.4. HEADSET DISTORTION AND NOISE33 8.4.1. Headset Send Distortion and Noise .34 Copyright Telecommunications Industry Association Provided by IHS under license with EIANot for ResaleNo reproduction or networking permitted witho
32、ut license from IHS-,-,-TIA-920 iii 8.4.2. Headset Receive Distortion and Noise 34 8.5. WEIGHTED TERMINAL COUPLING LOSS (TCLW) 35 8.5.1. Measurement Method . 35 8.5.2. Requirements 36 8.6. HEADSET LONG DURATION MAXIMUM ACOUSTIC PRESSURE (STEADY STATE). 36 8.6.1. Requirements 36 8.7. SHORT DURATION M
33、AXIMUM ACOUSTIC PRESSURE (PEAK) 36 8.7.1. Requirements 36 9. HANDSFREE TECHNICAL REQUIREMENTS (ADVISORY). 37 9.1. HANDSFREE FREQUENCY RESPONSE 37 9.1.1. Handsfree Send Frequency Response . 37 9.1.2. Handsfree Receive Frequency Response 39 9.2. HANDSFREE LOUDNESS RATINGS AND RECEIVE VOLUME CONTROL. 4
34、0 9.2.1. Handsfree Wideband Send Loudness Rating 40 9.2.2. Handsfree Wideband Receive Loudness Rating . 40 9.2.3. Handsfree Receive Volume Control . 41 9.3. HANDSFREE NOISE 41 9.3.1. Handsfree Send Noise. 41 9.3.2. Handsfree Send Single Frequency Interference 41 9.3.3. Handsfree Receive Noise 42 9.3
35、.4. Handsfree Receive Single Frequency Interference . 42 9.4. HANDSFREE DISTORTION AND NOISE 42 9.4.1. Handsfree Send Distortion and Noise. 42 9.4.2. Handsfree Receive Distortion and Noise 43 9.5. WEIGHTED TERMINAL COUPLING LOSS (TCLW) 44 9.5.1. Measurement Method . 44 9.5.2. Requirements 44 9.6. ST
36、ABILITY LOSS. 44 9.6.1. Measurement Method . 44 9.6.2. Requirement 44 ANNEX A (NORMATIVE) CALCULATION OF LOUDNESS RATINGS . 45 ANNEX B (INFORMATIVE) MEASUREMENT AND LEVEL CONVERSIONS . 48 ANNEX C (INFORMATIVE) R40 PREFERRED FREQUENCIES . 50 ANNEX D (NORMATIVE) DRP TO ERP TRANSFER FUNCTION. 51 Copyri
37、ght Telecommunications Industry Association Provided by IHS under license with EIANot for ResaleNo reproduction or networking permitted without license from IHS-,-,-TIA-920 iv FOREWORD (This foreword is not part of this standard.) This document is a TIA Telecommunications standard produced by Workin
38、g Group TR-41.3.3 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. This standard is based on ANSI/TIA/EIA-810-A. The TR-
39、41.3.3 VoIP and PCM Transmission Performance Working Group acknowledges the contribution made by the following individuals in the development of this standard. Name: Representing: Ron Magnuson Siemens Chair, Editor Roger Britt Nortel Networks Editor Franois Pinier Alcatel Kirit Patel Cisco Systems M
40、ichael Knappe Cisco Systems Ram Jagadeesan Cisco Systems John Bareham Consultant Glenn Hess MWM Acoustics John Barnes Nortel Networks Steve Graham Nortel Networks Allen Woo Plantronics Peter Baker Polycom Shane Ervin Polycom Copyrighted parts of ITU-T Appendix I to Recommendation G.113 and Recommend
41、ation 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 the copyright for the ISO Standards. Suggestions for improvement of this standard are welcome. They should be sent to:
42、Telecommunications Industry Association Engineering Department Suite 300 250 Wilson Boulevard Arlington, VA 22201 ( http:/www.tiaonline.org ) Copyright Telecommunications Industry Association Provided by IHS under license with EIANot for ResaleNo reproduction or networking permitted without license
43、from IHS-,-,-TIA-920 1 1. Introduction Advances in digital voice communications over non-traditional channels such as the Internet and Local Area Networks have made it necessary to redefine the way digital telephones are evaluated for voice quality. ANSI/TIA/EIA-810-A established handset, headset an
44、d handsfree telephone audio performance requirements for narrowband (300 and 3400 Hz) digital, wireline telephones regardless of protocol or digital format. This standard does the same for wideband telephony. It establishes handset, headset and handsfree telephone audio performance requirements for
45、wideband (150 and 6800 Hz) digital wireline telephones regardless of protocol or digital format. Copyright Telecommunications Industry Association Provided by IHS under license with EIANot for ResaleNo reproduction or networking permitted without license from IHS-,-,-TIA-920 2 2. Scope This standard
46、 establishes voice performance requirements for wideband digital, wireline telephones where transmission is in digital format. A telephone is defined as a device that terminates networks and provides telephony voice service. Transmission may be over Local Area Networks, Firewire/IEEE-1394, Universal
47、 Serial Bus (USB), public ISDN or digital over twisted pair wire. Applications include Voice over Internet Protocol (VoIP), and PCM-based telephones, whether connected through modems, gateways, or PBXs and personal computer-based telephones, which may or may not have handsets. Technical requirements
48、 are set for handset, headset and handsfree (speakerphone) modes of operation. These requirements apply regardless of the technology used to couple the handset or headset to the telephone. Coupling may be by a cord, a short-range air-interface such as, but not limited to, a radio interface, an elect
49、ric field interface, a magnetic field interface or an infra-red interface. 2.1. Limits of Applicability These requirements are not intended to describe specific requirements for the following types of digital voice terminal equipment: telephones with carbon transmitters, ISDN terminal adapters and cellular voice terminals. 2.2. Categories of Criteria Mandatory requirements are designated by the word “shall“. Adviso
