ETSI I-ETS 300 837-1998 Public Switched Telephone Network (PSTN) Terminals for Low Bit-Rate Multimedia Communication《公共交换电话网(PSTN) 低比特率多媒体通信终端》.pdf
《ETSI I-ETS 300 837-1998 Public Switched Telephone Network (PSTN) Terminals for Low Bit-Rate Multimedia Communication《公共交换电话网(PSTN) 低比特率多媒体通信终端》.pdf》由会员分享,可在线阅读,更多相关《ETSI I-ETS 300 837-1998 Public Switched Telephone Network (PSTN) Terminals for Low Bit-Rate Multimedia Communication《公共交换电话网(PSTN) 低比特率多媒体通信终端》.pdf(42页珍藏版)》请在麦多课文档分享上搜索。
1、STD-ETSI I-ETS 300 837-ENGL 1998 m 3Y00855 0270327 79T W v INTERIM EUROPEAN T I ELECOMMUNICATION STANDARD I=ETS 300 837 January 1998 Source: MTA Reference: Di/MTA-004033 ICs: 33.020 Key words: Coding, multimedia, PSTN Public Switched Telephone Network (PSTN); Terminals for low bit-rate multimedia co
2、mmunication ETSI European Telecommunications Standards institute ETSI Secretariat Postai address: F-O6921 Sophia Antipolis CEDEX - FRANCE Office address: 650 Route des Lucioles - Sophia Antipolis - Valbonne - FRANCE X.400: c=fr, a=atias, p=etsi, s=secretariat - Internet: secretariatQetsi.fr Tel.: +3
3、3 4 92 94 42 O0 - Fax: +33 4 93 65 47 16 Copyright Notification: No part may be reproduced except as authorized by written permission. The copyright and the foregoing restriction extend to reproduction in all media. Q European Telecommunications Standards Institute 1998. All rights reserved. STD-ETS
4、I I-ETS 300 837-ENGL 1778 m 300855 0270328 82b D Page 2 I-ETS 300 837: January 1998 Whilst every care has been taken in the preparation and publication of this document, errors in content, typographical or otherwise, may occur. If you have comments concerning its accuracy, please write to “ETSI Edit
5、ing and Committee Support Dept.“ at the address shown on the title page. . STDmETSI I-ETS 300 837-ENGL 1778 3Li00855 0270327 7b2 M Page 3 I-ETS 300 837: January 1998 Contents . Foreword .“-. -. 7 Introduction . . . 7 1 Scope . 9 1.1 1.2 1.3 Block diagram and functional elements . 9 Functional elemen
6、ts covered by this LETS . 10 System elemdnts outside the scope of this LETS . 9 2 Normative references . ._._. 11 3 Definitions and abbreviations . 12 3.1 Definitions 12 3.2 Abbreviations . 13 3.3 Conventions -.- 14 4 Functional reauirements . . 14 4.1 4.2 4.3 4.4 4.5 4.6 4.7 4.8 Required elements 1
7、4 Multiplexing . - 15 Information streams . 15 Modems 15 4.4.1 Logical channel numbers 15 4.4.2 Multiplex table entries 16 4.4.3 Flow control . 16 4.4.4 Error control . 16 4.4.5 Adaptation layers . 16 Control channel 16 4.5.1 Capabilities exchange . 17 4.5.2 Logical channel signalling 18 4.5.3 Mode
8、preferences . 19 4.5.4 Interface to multiplex . 19 4.5.5 Timer and counter values and protocol errors 19 Video channels 19 4.6.1 Interface to multiplex . 20 Audio channels 21 4.7.1 Delay compensation 21 4.7.2 Maximum delay jitter . 22 4.7.3 Interface to multiplexer 22 Data channels 22 4.8.1 Data pro
9、tocols . 23 4.8.1.1 Buffered ITU-T Recommendation V.14 . 24 4.8.1.2 LAPM / ITU-T Recommendation V.42 . 24 4.8.1.3 HDLC frame tunnelling 25 4.8.1.4 Transparent data . 25 4.8.2 Data applications . 25 4.8.2.1 ITU-T Recommendation T.120 multimedia 4.8.2.2 4.8.2.3 4.8.2.4 4.8.2.5 4.8.2.6 teleconferencing
10、 applications 26 IT-T Recommendation T.84 (SPIFF) point-to-point still image transfer cutting across application borders . 26 ITU-T Recommendation T.434 point-to-point telematic file transfer cutting across application borders 26 ITU-T Recommendation H.224 real-time control protocol. for ITU-T Recom
11、mendation H.281 far-end camera control . 27 Network link layer 27 External data ports and unspecified user data 27 5 Terminal procedures . 27 STD-ETSI I-ETS 300 837-ENGL 1498 3q00855 0270330 q8i Page 4 i-ETS 300 837: January 1998 5.1 5.2 Phase A . call set-up of voiceband channel 28 Phase B . initia
12、l analogue telephony communication 28 5.2.1 ITU-T Recommendation V.8 l O procedure 28 5.2.2 ITU-T Recommendation V.8bis procedure . 28 Phase C . establishment of digital communication. modem training 28 5.3.1 ITU-T Recommendation V.8 procedure . 28 5.3.2 ITU-T Recommendation V.8bis procedure . 29 Ph
13、ase D - initialization 29 5.4.1 Exchange of video by mutual agreement . 29 Phase E - communication . 30 5.5.1 Rate changes and retrains 30 5.5.2 Involuntary disconnection . 30 Phase F . end of session 30 Phase G - change of communication mode and call clearing . 30 5.3 5.4 5.5 5.6 5.7 6 Interoperati
14、on with other terminals 31 6.1 Speech only terminals 31 6.2 ETC 300 145 multimedia telephone terminals attached to the ISDN 31 6.3 Multimedia telephone terminals over mobile radio 31 7 Optional enhancements 31 7.1 Data facilities . 31 7.2 Encryption .- 32 7.2.1 EncryptionSE messages . 32 7.2.2 EIV c
15、hannel 32 7.2.3 Encryption procedure 32 7.2.4 Encryption initialization vectors . 33 7.2.5 Error recovery . 33 . 7.3 Multilink _ 34 8 Multipoint considerations 34 8.1 Establishment of common mode . 34 8.2 Multipoint rate matching . 34 8.3 Multipoint lip synchronization . 43 8.4 Multipoint encryption
16、 . 34 8.5 Cascaded MCU operation . 35 9 Maintenance . 35 9.1 Loopbacks for maintenance purposes 35 9.1.1 Normal mode 35 9.1.3 Media loopback . 35 9.1.4 Logical channel loopback . 35 9.1.2 System loopback 35 Annex A (normative): Protocol stack for control channel 37 A.l General . 37 A.2 SRP mode . 38
17、 A.2.1 SRP command frames 38 A.2.2 SRP response frames 38 A.2.3 SRP procedure at transmitter 38 A.2.4 SRP procedure at receiver . Co A.3 LAPM / ITU-T Recommendation V.42 mode 39 Annex B (normative): HDLC frame structure transparency for asynchronous transmission 40 Annex C (informative): Bit and oct
18、et order . 41 Annex D (informative): ITU-T Recommendation V.8bis codepoints . 42 Annex E (informative): Bibliography 43 STD.ETSI I-ETS 300 837-ENGL 1978 3900855 0270331 310 Page 5 LETS 300 837: January 1998 History . ,. , . . . . . 44 I - STD-ETSI I-ETS 300 837-ENGL 1778 3Li00855 0270332 257 9 Page
19、7 LETS 300 837: January 1998 Foreword This Interim European Telecommunication Standard (I-ETS) has been produced by the Multimedia Terminals and Applications (MTA) Technical Committee of the European Telecommunications Standards Institute (ETSI). An ETSI standard may be given LETS status either beca
20、use it is regarded as a provisional solution ahead of a more advanced standard, or because it is immature and requires a “trial period“. The life of an LETS is limited to three years after which it can be converted into an ETS, have its life extended for a further two years, be replaced by a new ver
21、sion, or be withdrawn. Announcement date Date of adoption of this I-ETS: Date of latest announcement of this LETS (doa): 2 January 1998 30 April 1998 Introduction This LETS describes terminals for low bit-rate multimedia communication, utilizing ITU-T Recommendation V.34 15 modems connected to the P
22、ublic Switched Telephone Network (PSTN). The terminals described in this I-ETC may carry real-time voice, data, and video, or any combination, including videotelephony. Terminals described in this LETS may be integrated into personal computers or implemented in stand-alone devices such as videotelep
23、hones. Support for each medium type (voice, data, video) is optional, but if supported, the ability to use a specified common mode of operation is required, so that all terminals supporting that medium type can interwork. This I-ETC allows more than one channel of each type to be in use. ITU-T Recom
24、mendations relating to this LETS are: H.223 l, H.245 2, H.263 4 and G.723.1 3. This LETS makes use of the logical channel signalling procedures of ITU-T Recommendation H.245 2, in which the content of each logical channel is described when the channel is opened. Procedures are provided for expressio
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