1、 ETSI TS 102 929 V2.2.1 (2015-10) Speech and multimedia Transmission Quality (STQ); Procedures for the identification and selection of common modes of de-jitter buffers and echo cancellers TECHNICAL SPECIFICATION ETSI ETSI TS 102 929 V2.2.1 (2015-10)2 Reference RTS/STQ-238 Keywords de-jitter buffer,
2、 QoS, quality ETSI 650 Route des Lucioles F-06921 Sophia Antipolis Cedex - FRANCE Tel.: +33 4 92 94 42 00 Fax: +33 4 93 65 47 16 Siret N 348 623 562 00017 - NAF 742 C Association but non lucratif enregistre la Sous-Prfecture de Grasse (06) N 7803/88 Important notice The present document can be downl
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6、eeSupportStaff.aspx Copyright Notification No part may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm except as authorized by written permission of ETSI. The content of the PDF version shall not be modified without the written au
7、thorization of ETSI. The copyright and the foregoing restriction extend to reproduction in all media. European Telecommunications Standards Institute 2015. All rights reserved. DECTTM, PLUGTESTSTM, UMTSTMand the ETSI logo are Trade Marks of ETSI registered for the benefit of its Members. 3GPPTM and
8、LTE are Trade Marks of ETSI registered for the benefit of its Members and of the 3GPP Organizational Partners. GSM and the GSM logo are Trade Marks registered and owned by the GSM Association. ETSI ETSI TS 102 929 V2.2.1 (2015-10)3 Contents Intellectual Property Rights 5g3Foreword . 5g3Modal verbs t
9、erminology 5g3Introduction 5g31 Scope 6g32 References 7g32.1 Normative references . 7g32.2 Informative references 7g33 Definitions and abbreviations . 9g33.1 Definitions 9g33.2 Abbreviations . 10g34 Characteristics of de-jitter buffers 11g34.1 De-Jitter buffers 11g34.2 Purpose, operation and environ
10、ment 11g34.3 External enabling of fixed de-jitter buffers 11g35 Characteristics of VBD-mode switching of de-jitter buffers 12g35.1 General . 12g35.2 Detector characteristics 13g35.2.1 Detector characteristics for frequency range of 2 100 Hz 21 Hz . 13g35.2.2 Detector characteristics for dual-frequen
11、cy tones 1 375 Hz + 2 002 Hz and 1 529 Hz + 2 225 Hz (Recommendation ITU-T V.8bis) . 13g35.2.3 Detector characteristics for frequencies 980 Hz, 1 180 Hz, 1 650 Hz and 1 850 Hz (V.21). 14g35.2.4 Detector characteristics for 2 100 Hz amplitude-modulated by a sinewave at 15 Hz, 2 100 Hz amplitude-modul
12、ated by a sinewave at 15 Hz with phase reversals, 1 300 Hz and 1 100 Hz (V.8) . 14g35.2.5 Detector characteristics for V.22 15g35.2.6 Detector characteristics for 2 100 Hz with phase reversals (V.25) . 16g35.2.7 Detector characteristics for Recommendation ITU-T V.32/V.32bis 19g35.2.8 Detector charac
13、teristics for Recommendation ITU-T T.30 19g35.2.9 Noise tolerance . 20g35.2.10 Operate time 20g35.2.11 False operation due to speech signals . 20g35.2.12 Release time 20g35.2.13 Other considerations . 20g36 Activation of de-jitter buffer for VBD . 20g37 Activation of de-jitter buffer for 64 kbit/s b
14、it sequence (UDI) 25g38 Requirements for values of de-jitter buffers . 26g38.1 Fixed de-jitter buffers . 26g38.2 Adaptive de-jitter buffers . 26g38.3 Activation procedure into the fixed mode 26g38.4 Transition from VBD to Voice mode (Recommendation ITU-T V.152) . 27g38.5 Handling of De-jitter buffer
15、 in case of lost or late packets . 28g39 Echo canceller 29g39.1 Introduction 29g39.2 Characteristics of an echo canceller tone disabler (Recommendation ITU-T G.168) 29g39.2.1 General 29g39.2.2 Detector characteristics . 29g39.2.3 Phase reversal detection 30g39.2.4 Guard band characteristics 30g39.2.
16、5 Noise tolerance . 31g39.2.6 Holding-band characteristics 31g39.2.7 Operate time 31g3ETSI ETSI TS 102 929 V2.2.1 (2015-10)4 9.2.8 False operation due to speech currents . 32g39.2.9 False operation due to data signals . 32g39.2.10 Release time 32g39.2.11 Other considerations . 32g3Annex A (normative
17、): De-jitter buffer Facsimile tests . 33g3A.1 Measurement method . 33g3Annex B (normative): Echo canceller Tests . 62g3B.1 Introduction 62g3B.1.1 Signals used 62g3B.1.2 Preparatory measurements 62g3B.2 Tests with echo simulation at Interface B 63g3B.2.1 Introduction 63g3B.2.2 Tests with test signals
18、 based on Composite Source Signal (CSS) 64g3B.2.2.1 Answer tones + C16 64g3B.2.2.2 Answer tones + first fax frame + C16 . 65g3B.2.2.3 Tests with test signals based on the Use of the CI call signal and exchange of CM/JM menu signals + C16 66g3B.2.2.4 Tests with test signals based on DTMF 67g3B.2.2.4.
19、1 Answer tones + D16 67g3B.2.2.5 Tests with test signals based on the Use of the CI call signal and exchange of CM/JM menu signals + D16 68g3B.3 Tests with echo simulation at Interface A 69g3B.3.1 Introduction 69g3B.3.2 Tests with test signals based on CSS 70g3B.3.2.1 Answer tones + C16 70g3B.3.2.2
20、Answer tones + first fax frame + C16 . 71g3B.3.2.3 Tests with test signals based on the Use of the CI call signal and exchange of CM/JM menu signals + C16 72g3B.3.2.4 Tests with test signals based on DTMF 73g3B.3.2.4.1 Answer tones + D16 73g3B.3.2.5 Tests with test signals based on the Use of the CI
21、 call signal and exchange of CM/JM menu signals + D16 74g3B.4 Tests with test signals based on the data rate change between V.34 and V.17 Fax Terminals 74g3Annex C (informative): Features of V.17 Fax and V.34 Fax 76g3C.1 Features of V.17 Fax (V.17 Fax Modem) 76g3C.2 V.34 High-Speed Fax . 76g3C.2.1 F
22、eatures 76g3C.2.2 The Recommendation ITU-T V.34 Fax Standard 76g3C.3 The V.34 Fax Connection and Session 77g3C.4 ECM as a Mandatory Feature . 78g3History 79g3ETSI ETSI TS 102 929 V2.2.1 (2015-10)5 Intellectual Property Rights IPRs essential or potentially essential to the present document may have b
23、een declared to ETSI. The information pertaining to these essential IPRs, if any, is publicly available for ETSI members and non-members, and can be found in ETSI SR 000 314: “Intellectual Property Rights (IPRs); Essential, or potentially Essential, IPRs notified to ETSI in respect of ETSI standards
24、“, which is available from the ETSI Secretariat. Latest updates are available on the ETSI Web server (http:/ipr.etsi.org). Pursuant to the ETSI IPR Policy, no investigation, including IPR searches, has been carried out by ETSI. No guarantee can be given as to the existence of other IPRs not referenc
25、ed in ETSI SR 000 314 (or the updates on the ETSI Web server) which are, or may be, or may become, essential to the present document. Foreword This Technical Specification (TS) has been produced by ETSI Technical Committee Speech and multimedia Transmission Quality (STQ). Modal verbs terminology In
26、the present document “shall“, “shall not“, “should“, “should not“, “may“, “need not“, “will“, “will not“, “can“ and “cannot“ are to be interpreted as described in clause 3.2 of the ETSI Drafting Rules (Verbal forms for the expression of provisions). “must“ and “must not“ are NOT allowed in ETSI deli
27、verables except when used in direct citation. Introduction The present document describes the characteristics of a de-jitter buffer, including the requirement for in-band tone activating and other control mechanisms. ETSI ETSI TS 102 929 V2.2.1 (2015-10)6 1 Scope De-jitter buffers and echo canceller
28、s have a major effect on voice and data transmission quality in telecommunication networks. They affect the three service categories of PSTN/ISDN voice, voiceband data (due to PSTN modem and fax calls), and ISDN circuit mode data. Since the requirements for the settings of de-jitter buffers differ f
29、or different services, the present document describes the activation and mode switching procedures of de-jitter buffers and echo cancellers, including the requirement for in-band tone activating and other control mechanisms. It is assumed that the clock accuracy of all elements involved is sufficien
30、tly high for application of the present document. The scope of the present document is considering de-jitter buffer usage in circuit-to-IP media gateways, such as residential, access or trunking gateways in context of NGN/IMS. The notion of circuit relates to a PSTN analog line or an ISDN 1x64 beare
31、r channel. The current version of the present document contains additional de-Jitter Buffer requirements for the transmission of V.152, Echo Canceller Tests and de-Jitter Buffer Tests. The requirements for Echo Cancellers and de-Jitter Buffers in for speech transmission are out of scope in the prese
32、nt document. These requirements are covered in ETSI ES 202 718 i.27. The present document is: a) applicable: a1) to circuit-to-IP media gateways and communication services with a gateway interworking function operating at the level of a synchronous byte-stream, such as: square4 service “voice-over-I
33、P“ (VoIP) without or with silence suppression; square4 service “voiceband data-over-IP“ (VBDoIP); and square4 service “circuit-mode data-over-IP“ (CMDoIP); a2) to IP-to-IP media gateways for dedicated interworking services between two IP domains, such as: square4 service “IPDV reduction between two
34、IP domains“ with different Grade of Service (GoS) as e.g. described in i.22; square4 service “RTP IPDV reduction between two RTP domains“, which may be subject of an “RTP transport translator“ topology (see i.23 and i.24); but IP-to-IP media gateways are basically out of scope of the present documen
35、t due to its focus on circuit-to-IP gateway types; and is: b) not applicable, because de-jitter buffers are not required: b1) to circuit-to-IP media gateways and communication services with a gateway interworking function operating at the level of individual packets as atomic units (i.e. an asynchro
36、nous packet-stream), such as: square4 service “facsimile-over-IP“ (FoIP) according to i.7; square4 service “text-over-IP“ (ToIP) according to i.25; and square4 service “data-over-IP“ (MoIP) according to i.26; b2) to IP-to-IP media gateways in general. ETSI ETSI TS 102 929 V2.2.1 (2015-10)7 2 Referen
37、ces 2.1 Normative references References are either specific (identified by date of publication and/or edition number or version number) or non-specific. For specific references, only the cited version applies. For non-specific references, the latest version of the reference document (including any a
38、mendments) applies. Referenced documents which are not found to be publicly available in the expected location might be found at http:/docbox.etsi.org/Reference. NOTE: While any hyperlinks included in this clause were valid at the time of publication, ETSI cannot guarantee their long term validity.
39、The following referenced documents are necessary for the application of the present document. 1 Recommendation ITU-T V.8 (2000): “Procedures for starting sessions of data transmission over the public switched telephone network“. 2 Recommendation ITU-T V.8bis (2000): “Procedures for the identificatio
40、n and selection of common modes of operation between data circuit-terminating equipments (DCEs) and between data terminal equipments (DTEs) over the public switched telephone network and on leased point to-point telephone-type circuits“. 3 Recommendation ITU-T G.168: “Digital network echo cancellers
41、“. 4 Recommendation ITU-T V.21 (1988): “300 bits per second duplex modem standardized for use in the general switched telephone network“. 5 Recommendation ITU-T V.22 (1988): “1200 bits per second duplex modem standardized for use in the general switched telephone network and on point-to-point 2-wire
42、 leased telephone-type circuits“. 6 Recommendation ITU-T V.25 (1996): “Automatic answering equipment and general procedures for automatic calling equipment on the general switched telephone network including procedures for disabling of echo control devices for both manually and automatically establi
43、shed calls“. 7 Recommendation ITU-T V.32 (1993): “A family of 2-wire, duplex modems operating at data signalling rates of up to 9600 bit/s for use on the general switched telephone network and on leased telephone-type circuits“. 8 Recommendation ITU-T V.32bis (1991): “A duplex modem operating at dat
44、a signalling rates of up to 14 400 bit/s for use on the general switched telephone network and on leased point-to-point 2-wire telephone-type circuits“. 9 Recommendation ITU-T V.152 (2010): “Procedures for supporting voiceband data over IP Networks“. 2.2 Informative references References are either
45、specific (identified by date of publication and/or edition number or version number) or non-specific. For specific references, only the cited version applies. For non-specific references, the latest version of the reference document (including any amendments) applies. NOTE: While any hyperlinks incl
46、uded in this clause were valid at the time of publication, ETSI cannot guarantee their long term validity. The following referenced documents are not necessary for the application of the present document but they assist the user with regard to a particular subject area. i.1 Recommendation ITU-T G.16
47、4: “Echo Suppressors“. i.2 Recommendation ITU-T G.165: “Echo Cancellers“. ETSI ETSI TS 102 929 V2.2.1 (2015-10)8 i.3 Recommendation ITU-T V.2 (1988): “Power levels for data transmission over telephone lines“. i.4 Void. i.5 Recommendation ITU-T G.131 (1996): “Control of talker echo“. i.6 Recommendati
48、on ITU-T Q.115.1 (1999): “Logic for the control of echo control devices/functions“. i.7 Recommendation ITU-T T.38 (2010): “Procedures for real-time Group 3 facsimile communication over IP networks“. i.8 Introduction to V.34 High-Speed Fax. NOTE: Website: http:/ latest access 4 July 2012. i.9 Recomme
49、ndation ITU-T V.34 (1998): “A modem operating at data signalling rates of up to 33 600 bit/s for use on the general switched telephone network and on leased point-to-point 2-wire telephone-type circuits“. i.10 Recommendation ITU-T T.30: “Procedures for document facsimile transmission in the general switched telephone network“. i.11 Recommendation ITU-T V.150.1: “Modem-over-IP networks: Procedures for the end-to-end connection of V-series DCEs“. i.12 Recommendation ITU-T V.18: “Pro
