1、 ETSI TS 102 929 V2.3.1 (2018-03) 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 V2.3.1 (2018-03)2 Reference RTS/STQ-267 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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7、written authorization of ETSI. The copyright and the foregoing restriction extend to reproduction in all media. ETSI 2018. All rights reserved. DECTTM, PLUGTESTSTM, UMTSTMand the ETSI logo are trademarks of ETSI registered for the benefit of its Members. 3GPPTM and LTETMare trademarks of ETSI regist
8、ered for the benefit of its Members and of the 3GPP Organizational Partners. oneM2M logo is protected for the benefit of its Members. GSMand the GSM logo are trademarks registered and owned by the GSM Association. ETSI ETSI TS 102 929 V2.3.1 (2018-03)3 Contents Intellectual Property Rights 5g3Forewo
9、rd . 5g3Modal verbs terminology 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,
10、operation and environment 12g34.3 External enabling of fixed de-jitter buffers 12g35 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 characteris
11、tics for dual-frequency tones 1 375 Hz + 2 002 Hz and 1 529 Hz + 2 225 Hz (Recommendation ITU-T V.8bis) . 14g35.2.3 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 1
12、00 Hz amplitude-modulated 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) . 17g35.2.7 Detector characteristics for Recommendation ITU-T V.32/V.32bis 19g3
13、5.2.8 Detector characteristics 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 21g35.2.13 Other considerations . 21g36 Activation of de-jitter buffer for VBD . 21g37 Activation of de-jitter b
14、uffer for 64 kbit/s bit 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 Handlin
15、g of De-jitter buffer 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 cha
16、racteristics 30g39.2.5 Noise tolerance . 31g39.2.6 Holding-band characteristics 31g39.2.7 Operate time 31g3ETSI ETSI TS 102 929 V2.3.1 (2018-03)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 . 3
17、2g310 Transmission Requirements for MGWs with respect to voice and data (VBD) and 64 Kbit/s transparent data service 32g310.1 Introduction: considerations on de-jitter buffer settings . 32g310.2 Codec Specific Requirements with respect to voice band data (VBD) 33g310.2.0 Introduction. 33g310.2.1 Rou
18、ndtrip delay 33g310.3 Specific Requirements with respect to 64 kbit/s transparent data service 34g310.3.1 Roundtrip delay and IP packet loss ratio 34g3Annex A (normative): De-jitter buffer Facsimile tests . 35g3A.1 Measurement method . 35g3Annex B (normative): Echo canceller Tests . 64g3B.1 Introduc
19、tion 64g3B.1.1 Signals used 64g3B.1.2 Preparatory measurements 64g3B.2 Tests with echo simulation at Interface B 65g3B.2.1 Introduction 65g3B.2.2 Tests with test signals based on Composite Source Signal (CSS) 66g3B.2.2.1 Answer tones + C16 66g3B.2.2.2 Answer tones + first fax frame + C16 . 67g3B.2.2
20、.3 Tests with test signals based on the Use of the CI call signal and exchange of CM/JM menu signals + C16 68g3B.2.2.4 Tests with test signals based on DTMF 69g3B.2.2.4.1 Answer tones + D16 69g3B.2.2.5 Tests with test signals based on the Use of the CI call signal and exchange of CM/JM menu signals
21、+ D16 70g3B.3 Tests with echo simulation at Interface A 71g3B.3.1 Introduction 71g3B.3.2 Tests with test signals based on CSS 72g3B.3.2.1 Answer tones + C16 72g3B.3.2.2 Answer tones + first fax frame + C16 . 73g3B.3.2.3 Tests with test signals based on the Use of the CI call signal and exchange of C
22、M/JM menu signals + C16 74g3B.3.2.4 Tests with test signals based on DTMF 75g3B.3.2.4.1 Answer tones + D16 75g3B.3.2.5 Tests with test signals based on the Use of the CI call signal and exchange of CM/JM menu signals + D16 76g3B.4 Tests with test signals based on the data rate change between V.34 an
23、d V.17 Fax Terminals 77g3Annex C (informative): Features of V.17 Fax and V.34 Fax 79g3C.1 Features of V.17 Fax (V.17 Fax Modem) 79g3C.2 V.34 High-Speed Fax . 79g3C.2.1 Features 79g3C.2.2 The Recommendation ITU-T V.34 Fax Standard 79g3C.3 The V.34 Fax Connection and Session 80g3C.4 ECM as a Mandatory
24、 Feature . 81g3History 82g3ETSI ETSI TS 102 929 V2.3.1 (2018-03)5 Intellectual Property Rights Essential patents IPRs essential or potentially essential to normative deliverables may have been declared to ETSI. The information pertaining to these essential IPRs, if any, is publicly available for ETS
25、I 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“, which is available from the ETSI Secretariat. Latest updates are available on the ETSI Web server (https:/ip
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27、to the present document. Trademarks The present document may include trademarks and/or tradenames which are asserted and/or registered by their owners. ETSI claims no ownership of these except for any which are indicated as being the property of ETSI, and conveys no right to use or reproduce any tra
28、demark and/or tradename. Mention of those trademarks in the present document does not constitute an endorsement by ETSI of products, services or organizations associated with those trademarks. Foreword This Technical Specification (TS) has been produced by ETSI Technical Committee Speech and multime
29、dia Transmission Quality (STQ). Modal verbs terminology In 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 prov
30、isions). “must“ and “must not“ are NOT allowed in ETSI deliverables 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.
31、3.1 (2018-03)6 1 Scope De-jitter buffers and echo cancellers 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
32、requirements for the settings of de-jitter buffers differ for 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 th
33、at the clock accuracy of all elements involved is sufficiently 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
34、circuit relates to a PSTN analog line or an ISDN 1x64 bearer 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 Buffe
35、rs in for speech transmission are out of scope in the present 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 sync
36、hronous byte-stream, such as: square4 service “voice-over-IP“ (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 dom
37、ains, such as: square4 service “IPDV reduction between two IP domains“ with different Grade of Service (GoS) as e.g. described in Recommendation ITU-T G.799.3 i.22; square4 service “RTP IPDV reduction between two RTP domains“, which may be subject of an “RTP transport translator“ topology (see IETF
38、RFC 5117 i.23 and Recommendation ITU-T H.248.88 i.24); but IP-to-IP media gateways are basically out of scope of the present document 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 commun
39、ication services with a gateway interworking function operating at the level of individual packets as atomic units (i.e. an asynchronous 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
40、“data-over-IP“ (MoIP) according to i.26; b2) to IP-to-IP media gateways in general. Additionally the present document contains Transmission Requirements for Media Gateways (MGWs) with respect to voiceband data (VBD) and 64 kbit/s transparent data service. ETSI ETSI TS 102 929 V2.3.1 (2018-03)7 2 Ref
41、erences 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 referenced document (including
42、any amendments) applies. Referenced documents which are not found to be publicly available in the expected location might be found at https:/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 vali
43、dity. The following referenced documents are necessary for the application of the present document. 1 Recommendation ITU-T V.8 (11/2000): “Procedures for starting sessions of data transmission over the public switched telephone network“. 2 Recommendation ITU-T V.8bis (11/2000): “Procedures for the i
44、dentification 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 ech
45、o cancellers“. 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-
46、point 2-wire 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 automatic
47、ally established 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 oper
48、ating at data 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
49、 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 amendments) applies. NOTE: While any hyperlinks included 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 reg
