1、 ETSI TR 102 719 V1.1.1 (2011-05)Technical Report Speech and multimedia Transmission Quality (STQ);Perceptual Impact of End-to-End Delay andEnd-to-End Delay Variation onFax-over-IP (FoIP) and Modem-over-IP (MoIP)floppy3ETSI ETSI TR 102 719 V1.1.1 (2011-05) 2Reference DTR/STQ-00147 Keywords fax, IP,
2、modem, QoS 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 Individual copies of the present doc
3、ument can be downloaded from: http:/www.etsi.org The present document may be made available in more than one electronic version or in print. In any case of existing or perceived difference in contents between such versions, the reference version is the Portable Document Format (PDF). In case of disp
4、ute, the reference shall be the printing on ETSI printers of the PDF version kept on a specific network drive within ETSI Secretariat. Users of the present document should be aware that the document may be subject to revision or change of status. Information on the current status of this and other E
5、TSI documents is available at http:/portal.etsi.org/tb/status/status.asp If you find errors in the present document, please send your comment to one of the following services: http:/portal.etsi.org/chaircor/ETSI_support.asp Copyright Notification No part may be reproduced except as authorized by wri
6、tten permission. The copyright and the foregoing restriction extend to reproduction in all media. European Telecommunications Standards Institute 2011. All rights reserved. DECTTM, PLUGTESTSTM, UMTSTM, TIPHONTM, the TIPHON logo and the ETSI logo are Trade Marks of ETSI registered for the benefit of
7、its Members. 3GPPTM is a Trade Mark of ETSI registered for the benefit of its Members and of the 3GPP Organizational Partners. LTE is a Trade Mark of ETSI currently being registered for the benefit of its Members and of the 3GPP Organizational Partners. GSM and the GSM logo are Trade Marks registere
8、d and owned by the GSM Association. ETSI ETSI TR 102 719 V1.1.1 (2011-05) 3Contents Intellectual Property Rights 5g3Foreword . 5g3Introduction 5g31 Scope 6g32 References 6g32.1 Normative references . 6g32.2 Informative references 6g33 Definitions and abbreviations . 7g33.1 Definitions 7g33.2 Abbrevi
9、ations . 7g34 QoS Tests in the NGN Architecture . 9g34.1 Test configuration. 9g35 Test Concept and Description of Test Cases 9g35.1 General Settings for All Test Cases 10g35.1.1 Diffserv Prioritisation Settings . 10g35.1.2 Network Echo Canceller . 10g35.1.3 De-Jitter Buffer . 10g35.1.4 T.38 Options
10、. 10g35.1.5 Terminal Registration Messages . 10g35.1.6 Additional Channels . 11g35.1.7 Number of Repetitions per Test Case . 11g35.2 Reference Delay Variation Tests 11g35.3 Fax Tests with T.38-Termination . 12g35.3.1 Scenario F_T38_T38: T.38 to T.38 Fax Tests 12g35.3.2 Scenario F_T38_A: T.38 to Anal
11、ogue Fax Tests 17g35.3.3 Scenario F_A_T38: Analogue to T.38 Fax Tests 22g35.4 Fax Tests with Analogue Termination . 25g35.4.1 Scenario F_VGW_VGW: VGW to VGW Fax Tests 26g35.4.2 Scenario F_VGW_A: VGW to Analogue Fax Tests 37g35.4.3 Scenario F_A_VGW: Analogue to VGW Fax Tests 48g35.4.4 Scenario F_A_A:
12、 Analogue to Analogue Fax Tests . 59g35.5 Modem Tests with Analogue Termination . 62g35.5.1 Scenario M_VGW_VGW: VGW to VGW Modem Tests 63g35.5.2 Scenario M_VGW_A: VGW to Analogue Modem Tests . 75g35.5.3 Scenario M_A_VGW: Analogue to VGW Modem Tests . 87g35.5.4 Scenario M_A_A: Analogue to Analogue Mo
13、dem Tests . 99g36 Quality Assessment Methodologies . 103g36.1 T.38 and Fax transmission tests 103g36.2 Modem transmission tests 104g36.3 Proposal of a Numerical Algorithm in order to allow for a Numerical Ranking Order of Test Results . 104g37 Results 104g37.1 Results for Fax with T.38 -Termination
14、. 104g37.2 Results for Fax with Analogue Termination 104g37.2.1 Scenario F_VGW_VGW 104g37.2.1.1 Low speed fax transmission using T.38 with DSL bandwidth variation and additional traffic on DSL link 104g37.2.2 Scenario F_VGW_A . 104g37.2.2.1 Low speed (V.17) fax transmission using T.38 with DSL bandw
15、idth variation and additional traffic on DSL link 105g37.2.2.2 High speed (V.34) fax transmission using G.711 with End-to-end delay variation and Redundancy variation 105g3ETSI ETSI TR 102 719 V1.1.1 (2011-05) 47.2.2.3 Fax transmission using Adaptive JB with End-to-end delay variation and Redundancy
16、 variation . 105g37.2.2.4 Charts for selected Parameters 105g37.2.3 Scenario F_A_VGW . 106g37.2.3.1 Low speed fax transmission using T.38 with DSL bandwidth variation and additional traffic on DSL link 107g37.2.3.2 High speed fax transmission using G.711 with End-to-end delay variation and Redundanc
17、y variation 107g37.2.3.3 Fax transmission using Adaptive JB with End-to-end delay variation and Redundancy variation . 107g37.2.3.4 Charts for selected Parameters 107g37.2.4 Scenario F_A_A . 108g37.2.4.1 Low speed fax transmission using T.38 with End-to-end delay variation and Redundancy variation 1
18、09g37.2.4.2 High speed fax transmission using G711 with End-to-end delay variation and Redundancy variation 109g37.2.4.3 Fax transmission using Adaptive JB with End-to-end delay variation and Redundancy variation . 109g37.2.4.4 Charts for selected Parameters 109g37.3 Results for Modem with Analogue
19、Termination 111g37.3.1 Scenario M_VGW_VGW . 111g37.3.1.1 Analog modem V.32bis with DSL bandwidth variation and additional traffic on DSL link 111g37.3.2 Scenario M_VGW_A . 111g37.3.2.1 Analog modem V.32bis with End-to-end delay variation 111g37.3.2.2 Analog modem V.90 at with End-to-end delay variat
20、ion 111g37.3.3 Scenario M_A_VGW . 112g37.3.3.1 Analog modem V.32bis with End-to-end delay variation 112g37.3.3.2 Analog modem V.90 at with End-to-end delay variation 112g37.3.4 Scenario M_A_A 112g37.3.4.1 Analog modem V.32bis with End-to-end delay variation . 112g37.3.4.2 Analog modem V.90 at with E
21、nd-to-end delay variation 112g38 Feedback from Discussions with the STF392 Steering Group and with Stakeholders 112g38.1 Predictions for tests not conducted based on the results achieved 112g38.2 Additional Scenarios in the focus of stakeholders 112g3Annex A: Use cases . 113g3A.1 Scenario #1 - IMS-b
22、ased PES scenario, intra-IMS call between two SIP gateways 113g3A.2 IMS 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 (http:/webapp.etsi.org/IPR/home.asp). Pu
23、rsuant 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 referenced 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 d
24、ocument. Foreword This Technical Report (TR) has been produced by ETSI Technical Committee Speech and multimedia Transmission Quality (STQ). Introduction Quality of Service (QoS) may be loosely defined as a measure of the end-users perception of the ease of use and the accuracy of the facility being
25、 provided. QoS has always been an important measure of the performance of communications networks. In networks where the connectivity is fixed for the duration of particular communication it is relatively easy to define the maximum impairment produced in the individual elements making up the connect
26、ion, such that their addition would still result in an acceptable service being provided. In packet based networks, routing of individual data packets constantly varies. Due to the complexities and random nature of packet routing, any end-user transaction has the possibility of being completed via a
27、 very large number of links using varying technologies. This may result in the possibility of the end-user perception in terms of the distortion, delay, error rate, etc. changing from time to time during a particular transaction. End-to-end error-correcting techniques serve to reduce the perceived p
28、roblems for data services but the quality of speech connections can be seriously impaired if network performance is not adequately controlled. The above applies in particular for fax and modem connections as, different to speech calls, no loss of packets can be accepted and only moderate end-to-end
29、delays are tolerable. The electronic versions of the excel sheets related to the test case descriptions of clauses 5.3, 5.4 and 5.5 are contained in tr_102719v010101p0.zip which accompanies the present document. They may be used for electronic processing of the test results. ETSI ETSI TR 102 719 V1.
30、1.1 (2011-05) 61 Scope The present document addresses the analysis of the different requirements for reliable real-time modem and facsimile transmission over packet-based networks. The metrics for an evaluation of the overall MoIP and FoIP transmission quality are developed and proposed, and the var
31、ious characteristics of the packet-based network, like network delay and its variation (jitter) and the effects of discarded packets (in the jitter buffer), with an emphasis on modem/facsimile transmission using different codecs are investigated in order to determine the margins of the network and m
32、edia gateways and gateway parameters that enable a successful and reliable real-time modem/facsimile transfer over packet-based networks. Emphasis is on the modem/facsimile transmission using different codecs and media gateways and gateways in order to determine the margins of the media gateways and
33、 gateway parameters that enable a successful and reliable real-time modem/facsimile transfer over packet-based networks. In contrast to the original intention, a perceptual metrics could not be derived, since the results obtained indicate that there is not very much of a “grey zone“ for the quality,
34、 but rather a “go / no-go“ behaviour; the design of perceptual metrics can be considered as future work in this area. The task of the STF 392 was separated in two steps; the first step was to define an extensive list of test conditions and the second step was to perform a selection of these test. It
35、 is expected to have additional results available in a revision of the present document in the near future. The material collected here can be used as a basis for future MoIP and FoIP tests. 2 References References are either specific (identified by date of publication and/or edition number or versi
36、on 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. Referenced documents which are not found to be publicly available in the expected location might be found
37、 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. 2.1 Normative references The following referenced documents are necessary for the application of the present document. Not app
38、licable. 2.2 Informative references 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 ITU-T Recommendation. G.168 (2009): “Digital network echo cancellers“. i.2 ITU-T Recommendation
39、V.152: “Procedures for supporting Voice-Band Data over IP Networks“. i.3 ITU-T Recommendation E.453: “Facsimile image quality as corrupted by transmission-induced scan line errors“. i.4 ITU-T Recommendation E.458: “Figure of merit for facsimile transmission performance“. i.5 ITU-T Recommendation P.8
40、62.1: “Mapping function for transforming P.862 raw result scores to MOS-LQO“. ETSI ETSI TR 102 719 V1.1.1 (2011-05) 7i.6 ITU-T Recommendation T.38: “Procedures for real-time Group 3 facsimile communication over IP networks“. i.7 ITU-T Recommendation H.248: “Gateway control protocol“. i.8 ITU-T Recom
41、mendation G.711: “Pulse code modulation (PCM) of voice frequencies“. i.9 ITU-T Recommendation G729: “Coding of speech at 8 kbit/s using conjugate-structure algebraic-code-excited linear prediction (CS-ACELP)“. i.10 ITU-T Recommendation V.17: “A 2-wire modem for facsimile applications with rates up t
42、o 14 400 bit/s“. i.11 ITU-T Recommendation V.22bis: “2400 bits per second duplex modem using the frequency division technique standardized for use on the general switched telephone network and on point-to-point 2-wire leased telephone-type circuits“. i.12 ITU-T Recommendation V.32bis: “A duplex mode
43、m operating 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“. i.13 ITU-T Recommendation V.34 “A modem operating at data signalling rates of up to 33 600 bit/s for use on the general switched
44、telephone network and on leased point-to-point 2-wire telephone-type circuits“. i.14 ITU-T Recommendation V.90: “A digital modem and analogue modem pair for use on the Public Switched Telephone Network (PSTN) at data signalling rates of up to 56 000 bit/s downstream and up to 33 600 bit/s upstream“.
45、 3 Definitions and abbreviations 3.1 Definitions For the purposes of the present document, the following terms and definitions apply: Packet Formation Time: time required to fill a packet with real-time traffic, often also referred to as “packet size“ 3.2 Abbreviations For the purposes of the presen
46、t document, the following abbreviations apply: AGCF Access Gateway Control Function AGF Access Gateway Function AGW Access Gateway BE Best Effort CPE Customer Premises Equipment CPN Customer Premises Network DSCP Differentiated Services Code Point DSL Digital Subscriber Line DSP Digital Signal Proce
47、ssorFoIP Fax over IP FoIP Fax over IP FOM Figure Of Merit GW Gateway IAF Internet-Aware Fax IBCF Interconnect Border Control Function I-BGF Interconnection-Boader Control Function IETF Internet Engineering Task Force IMS IP Multimedia Subsystem IP Internet Protocol ETSI ETSI TR 102 719 V1.1.1 (2011-
48、05) 8ISDN Integrated Services Digital Network ITU-T International Telecommunication Union - Telecommunication Standardization Sector IWF Inter-Working Function JB Jitter BufferLAN Local Area network MCF Message Confirmation frame MGCP Media Gateway Control Protocol MoIP Modem over IP NAPT Network Ad
49、dress and Port Translation NCL Negotiated Codec List NGN Next Generation Network NNI Network Network Interface PBX Private Branch Exchange PCMA Pulse Code Modulation A-law PCMU Pulse Code Modulation -law PES PSTN Emulation Server PESQ Perceptual Eveluation of Speech Quality PSTN Public Switched Telephone Network QoS Quality of Service RACS Resource and Admission Control Sub-System RAGW residential or access gateways RG Residential GatewayRGW Residential GateWay RTP EF Real Time Protocol Enhanced Functions S/T ISDN-Basic User Network Interface SBC
