TIA TSB-116-A-2006 Telecommunications IP Telephony equipment Voice Quality Recommendations for IP Telephony《IP电话的电信IP电话设备语音质量建议》.pdf
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1、 TSB-116-A (Revision of TSB-116) March 2006 (Reaffirmed May 2011) Telecommunications IP Telephony equipment Voice Quality Recommendations for IP Telephony NOTICE OF COPYRIGHT This document is copyrighted by the TIA. Reproduction of these documents either in hard copy or soft copy (including posting
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8、andards (whether designated as a standard, specification, recommendation or otherwise), whether 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 recor
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11、wise investigate products, designs or services or any claims of compliance with the contents of 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 PARTICU
12、LAR PURPOSE OR USE, ITS MERCHANTABILITY AND ITS NONINFRINGEMENT OF ANY THIRD PARTYS INTELLECTUAL 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 STA
13、TUTE, RULE OR REGULATION, OR THE SAFETY OR HEALTH EFFECTS OF THE CONTENTS OR ANY PRODUCT OR SERVICE 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 CONTENT
14、S CONTAINED HEREIN, INCLUDING WITHOUT LIMITATION ANY AND ALL INDIRECT, SPECIAL, INCIDENTAL OR CONSEQUENTIAL 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 LIAB
15、ILITY OR OTHERWISE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. THE FOREGOING NEGATION OF DAMAGES IS A FUNDAMENTAL ELEMENT OF THE USE OF THE CONTENTS HEREOF, AND THESE CONTENTS WOULD NOT BE PUBLISHED BY TIA WITHOUT SUCH LIMITATIONS. TIA/TSB-116-A i TABLE OF CONTENTS 1. INTRODUCTION . 1 1.1.
16、SUMMARY OF VOICE QUALITY RECOMMENDATIONS FOR IP TELEPHONY. 1 2. REFERENCES 2 3. DEFINITIONS, ABBREVIATIONS AND ACRONYMS . 4 3.1. WAVEFORM CODEC AND SPEECH COMPRESSION CODEC . 4 3.2. ABBREVIATIONS AND ACRONYMS 4 4. THE E-MODEL. 5 4.1. TRANSMISSION RATING FACTOR “R” . 6 4.2. IP TELEPHONY IMPAIRMENTS A
17、ND THE E-MODEL. 6 4.2.1. Delay . 7 4.2.2. Echo 8 4.2.3. Speech Compression . 11 4.2.4. Packet Loss . 13 4.3. WHAT DOES R SOUND LIKE? . 16 4.4. E-MODEL SYMMETRY AND PERFORMANCE 17 4.5. E-MODEL ENHANCEMENTS 17 4.6. E-MODEL CONVENTIONS 18 5. WIRELINE PSTN VOICE QUALITY BENCHMARKS 19 5.1. ISDN VOICE QUA
18、LITY. 20 5.2. PSTN VOICE QUALITY 21 5.3. TOLL COMPRESSION VOICE QUALITY 24 5.4. WIRELINE PSTN VOICE QUALITY SUMMARY 26 6. IP TELEPHONY VOICE QUALITY ANALYSIS 27 6.1. VOICE QUALITY ISSUES FOR IP TELEPHONY . 29 6.2. VOICE QUALITY RECOMMENDATIONS FOR IP TELEPHONY 30 6.2.1. Delay .30 6.2.2. Speech Compr
19、ession . 35 6.2.3. Packet Loss . 37 6.2.4. Transcoding. 41 6.2.5. Tandeming 42 6.2.6. New Voice Gateway and Digital End Office Loss Plans 45 ANNEX A (INFORMATIVE) VOIP END-TO-END DELAY BUDGET PLANNING FOR PRIVATE NETWORKS 47 A.1. VOIP END-TO-END DELAY SOURCES OVERVIEW. 47 A.2. VOIP END-TO-END DELAY
20、SOURCE DEFINITIONS 48 A.3. VOIP END-TO-END DELAY BUDGET CASE 1 . 51 A.4. VOIP END-TO-END DELAY BUDGET CASE 2 . 53 A.4. VOIP END-TO-END DELAY BUDGET CASE 2 . 53 TIA/TSB-116-A ii FOREWORD (This foreword is not part of this standard.) This document is a TIA Telecommunications Technical Services Bulleti
21、n (TSB) revised by Subcommittee TR-41.1 of Committee TR-41. This TSB was developed in accordance with TIA procedural guidelines, and represents the consensus position of the Subcommittee TR-41.1, which served as the formulating group. The TR-41.1.2 VoIP Voice Quality Working Group acknowledges the c
22、ontribution made by the following individuals in the development of this standard. Name Representing Roger Britt Nortel Networks Editor Mark Armstrong Nortel Networks Dermot Kavanagh Nortel Networks Peter Melton eOn Communications Kirit Patel Cisco Systems Copyrighted parts of ITU-T Appendix I to Re
23、commendation G.113 and Recommendation G.114 are used with permission of the ITU. The ITU owns the copyright for the ITU Recommendations. Suggestions for improvement of this standard are welcome. They should be sent to: Telecommunications Industry Association Engineering Department Suite 300 250 Wils
24、on Boulevard Arlington, VA 22201 TIA/TSB-116-A 1 1. Introduction The objectives of this TSB are to provide end-to-end voice quality guidelines for North American IP Telephony and to an E-Model tutorial for IP scenarios. IP Telephony introduces several impairments, some of which are familiar and some
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