1、STDmITU-T RECMN J*LLi-ENGL 3998 4Bb259L Oh55015 925 INTERNATIONAL TELECOMMUNICATION UNION ITU-T TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU JA12 (03/98) SERIES J: TRANSMISSION OF TELEVISION, SOUND PROGRAMME AND OTHER MULTIMEDIA SIGNALS Interactive systems for digital television distribution Tran
2、smission systems for interactive cable television services ITU-T Recommendation J.112 (Previously CCITT Recommendation) COPYRIGHT International Telecommunications Union/ITU TelecommunicationsLicensed by Information Handling ServicesITU-T J-SERIES RECOMMENDATIONS TRANSMISSION OF TELEVISION, SOUND PRO
3、GRAMME AND OTHER MULTIMEDIA SIGNALS General Recommendations General specifications for analogue sound-programme transmission Performance characteristics of analogue sound-programme circuits Equipment and lines used for analogue sound-programme circuits Digital encoders for analogue sound-programme s
4、ignals Digital transmission of sound-programme signals Circuits for analogue television transmission Analogue television transmission over metallic lines and interconnection with radio-relay links Digital transmission of television signals Ancillary digital services for television transmission Opera
5、tional repuirements and methods for television transmission J.l-J.9 J. IO-J. 19 J.20-J.29 J.30-J.39 J.40-J.49 J.50-J.59 J.60-J.69 J.70-J.79 J.80-J.89 J.90-J.99 J. 100-J. 109 Transport of MPEG-2 signals on packetised networks Measurement of the quality of service Digital television distribution throu
6、gh local subscriber networks J. 130-J. 139 J.140-5.149 J. 150-J. 159 For firthw details, please refer to ITU-T List of Recommendations. COPYRIGHT International Telecommunications Union/ITU TelecommunicationsLicensed by Information Handling ServicesITU-T RECOMMENDATION 5.112 TRANSMISSION SYSTEMS FOR
7、INTERACTIVE CABLE TELEVISION SERVICES Summary This Recommendation “Transmission systems for interactive cable television services“ extends the scope of Recommendation J.83 “Digital multi-programme systems for television, sound and data services for cable distribution“ to make provision for bidirecti
8、onal data over coaxial and hybrid fibre-coax cables for interactive services. Like Recommendation 3.83, this Recommendation also contains several annexes in recognition of different existing media environments. The annexes in this Recommendation are intended to be read in conjunction with the corres
9、ponding annexes in Recommendation 5.83. It is recommended that for the introduction of fast internet access and/or interactive cable television services, the systems in this Recommendation be used to achieve the benefits of economies of scale and facilitate interoperability. Source ITU-T Recommendat
10、ion J.112 was prepared by IT-T Study Group 9 (1997-2000) and was approved under the WTSC Resolution No. 1 procedure on the 18th of March 1998. Recommendation 5.112 (03/98) 1 COPYRIGHT International Telecommunications Union/ITU TelecommunicationsLicensed by Information Handling ServicesFOREWORD ITU (
11、International Telecommunication Union) is the United Nations Specialized Agency in the field of telecommuni- cations. The IT Telecommunication Standardization Sector (ITU-T) is a permanent organ of the ITU. The ITU-T is responsible for studying technical, operating and tariff questions and issuing R
12、ecommendations on them with a view to standardizing telecommunications on a worldwide basis, The World Telecommunication Standardization Conference (WTSC), which meets every four years, establishes the topics for study by the IW-T Study Groups which, in their turn, produce Recommendations on these t
13、opics. The approval of Recommendations by the Members of the ITU-T is covered by the procedure laid down in WTSC Resolution No. 1. In some areas of information technology which fall within ITLJ-Ts purview, the necessary standards are prepared on a collaborative basis with IS0 and IEC. NOTE In this R
14、ecommendation, the expression “Administration“ is used for conciseness to indicate both a telecommunication administration and a recognized operating agency. INTELLECTUAL PROPERTY RIGHTS The IT draws attention to the possibility that the practice or implementation of this Recommendation may involve
15、the use of a claimed Intellectual Property Right. The ITU takes no position concerning the evidence, validity or applicability of claimed Intellectual Property Rights, whether asserted by ITU members or others outside of the Recommendation development process. As of the date of approval of this Reco
16、mmendation, the ITU had not received notice of intellectual property, protected by patents, which may be required to implement this Recommendation. However, implementors are cautioned that this may not represent the latest information and are therefore strongly urged to consult the TSB patent databa
17、se. O ITU 1998 All rights reserved. No part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from the ITU. 11 Recommendation 5.112 (03198) COPYRIGHT International Telecommunica
18、tions Union/ITU TelecommunicationsLicensed by Information Handling ServicesSTD-ITU-T RECMN J*LLZ-ENGL 1998 486259L 0655037 570 CONTENTS 1 Scope 2 References 2.1 Normative References . 2.2 Informative references 3 Terms and defmitions . 4 Abbreviations . 5 Interactive cable television services . Anne
19、x A - Interaction channel for digital video broadcasting cable television distribution systems . A.l Scope . A.2 Normative references A.3 Abbreviations A.4 Referencemodel for system architecture of narrowband interaction channels in a broadcasting scenario (asymmetric interactive services) A.4.1 Pro
20、tocol stack model . A.4.2 System model Interaction Channel specification for CATV networks . A.5.1 System concept A.5.2 Lower physical layer specification A.5.3 Framing . A.5.4 Slot timing assignment A.5.5 MAC functionality AS Annex B - Data-over-cable radio fiequency interface . B . 1 B.2 B.3 B.4 B
21、.5 Scope and purpose B.1.3 Background . Functional assumptions . B.l.l Scope . B.1.2 Requirements . B.2.1 Broadband access network B.2.2 Equipment assumptions . B.2.3 RF channel assumptions B.2.4 Transmission levels . B.2.5 Frequency inversion Communication protocols . B.3.1 Protocol stack B.3.2 The
22、 MAC Fonvarder . B.3.3 Network Layer . B.3.4 Above the Network Layer . B.3.5 Data Link Layer B.3.6 Physicd layer Physical media dependent sublayer specification . B.4.1 Scope . B.4.2 Upstream . B.4.3 Downstream Downstream transmission convergence sublayer B.5.1 Introduction . B.5.2 WEG Packet format
23、 . B.5.3 WEG Header for MCNS Data-Over-Cable . B.5.4 MPEG Payload for MCNS Data-Over-Cable B.5.5 Interaction with the MAC sublayer . B.5.6 Interaction with the Physical layer B.5.7 WEG Header synchronization and recovery . Page 1 1 1 3 4 10 13 13 13 13 13 14 14 14 16 16 18 30 41 47 84 84 84 84 85 87
24、 88 88 89 90 90 91 91 94 95 95 96 97 98 98 98 113 117 117 118 118 118 119 120 121 . il1 Recommendation 5.112 (03198) COPYRIGHT International Telecommunications Union/ITU TelecommunicationsLicensed by Information Handling ServicesB.6 B.7 B.8 B.9 Media access control specification B.6.1 Introduction .
25、 B.6.2 MAC Frame formats . B.6.3 MAC Management messages B.6.4 Upstream bandwidth allocation . B.6.5 Timing and synchronization B.6.6 Data link encryption support . Cable modem - CMTS interaction B.7.1 CMTS initialization . B.7.2 Cable modem initiaiization Supporting future new cable modem capabilit
26、ies . B.8.1 Setting up communications on an enhanced basis . B.8.2 Downloading cable modem operating software Provision for other future capabilities . B.9.1 Anticipated physical-layer changes . B.9.2 New network service requirements . B.9.3 PID filtering capability Appendix B.1- Well-Known Addresse
27、s . B.I.l MAC addresses . B.I.2 MAC Service IDS B.I.3 MPEG PID Appendix B.11 -Parameters and constants Appendix B.111- CM configuration interface specification B.III.l DHCP fields used by the CM B.I11.2 CM binary configuration file format . B.III.3 Configuration file settings . B.I11.4 Configuration
28、 file creation B.III.5 CM MIC calculation B.III.6 CMTS MIC calculation B.III.7 Registration configuration settings Appendix B.IV - MAC sublayer service definition B.IV.l Service at the CM B.IV.2 MACCM-802-DATA.request B.IV.3 MACCM-DIX-DATAxequest . B.IV.4 MACCM-ATM-DATA.request . B.IV.5 MACCM-802-DA
29、TA.indication B.IV.6 MACCM-DIX-DATA.indication B.IV.7 MACCM-ATM-DATAhdication . B.IV.8 MACCM-DATA.acknowledgment B.V.1 Introduction . B.V.2 Example preamble sequence . B.V.3 Example Burst Profiles Appendix B.VI - Upstream modulation rates B.VI.l Introduction . B.VI.2 Sources of narrowband ingress .
30、B.VI.3 Fitting data carriers within the ingress gaps Appendix B.VI1 - Example: Multiple upstream channels . Appendix B.VIII - The data-over-cable spanning tree protocol . B.VIII.1 Background . B.VIII.2 Public Spanning Tree B.VIII.3 Public spanning tree protocol details . B.VIII.4 Spanning tree param
31、eters and defaults Annex C - Multimedia data transmission equipment over cable television network . C.l Introduction . C.2 Definition of reference system and Interfaces . B.III.8 Encodings Appendix B.V - Example Burst Profiles . Page 121 121 122 133 151 159 161 162 162 163 179 179 179 180 180 181 18
32、3 184 184 184 184 185 186 186 186 187 187 189 189 189 190 197 197 197 197 198 198 198 198 198 199 199 199 200 209 209 209 211 213 214 214 214 215 216 217 217 217 iv Recommendation 5.112 (03/98) COPYRIGHT International Telecommunications Union/ITU TelecommunicationsLicensed by Information Handling Se
33、rvices(2.3 Protocol stacks C.3.1 Interface A protocol stack . C.3.2 Interface A physical layer and data link layer . C.3.3 Interface A network layer C.3.4 interface B protocol stack C.3.5 Interface C protocol stack C.3.6 Interface C physical layer and data link layer . C.3.7 Interface C network laye
34、r C.4 Physical layer specification . C.4.1 Upstream . C.4.2 Downstream Transmission convergence sublayer specification C.5.1 Introduction . C.5.2 MPEG Packet format . C.5.3 MPEG Header . C.5.4 Interface with MAC sublayer C.5.5 Physical layer interaction C.5.6 WEG Header synchronization and recovery
35、. C.6 MAC layer specification . C.6.1 Introduction . C.6.2 MAC Frame format . C.6.3 MAC Management message C.5 Page 218 218 218 218 218 219 219 219 219 219 222 223 223 224 224 225 226 226 226 226 229 236 Recommendation 5.112 (03/98) V COPYRIGHT International Telecommunications Union/ITU Telecommunic
36、ationsLicensed by Information Handling ServicesIntroduction Digital television services have been established in many countries and the benefits of extending these to provide interactive services are widely recognized. Cable television distribution systems are particularly suited for the implementat
37、ion of bidirectional data services and this Recommendation complements the system specifications in Recommendation J.83. Whilst the annexes reflect the different environments, there is substantial commonality. The services may include fast Internet access and/or interactive cable television. The tra
38、nsmission protocols supported include, but are not limited to IP and ATM. The reference architectures are all based on Recommendation J.110. In each case downstream transmission involves optional constant bit rate streams protected by scrambling and forward error correction, with multiplexing such t
39、hat a head end can support a large number of remote stations (see A.5.1.1, B.3.6, C.4.2). Upstream transmission from the stations also involves a similar multiplex for which a Media Access Control (MAC) layer manages access on a contention or contentionless basis (see A.5.1.3, B.3.6 and C.4.1). Rega
40、rding spectrum allocation, an approach is used throughout whereby downstream transmission is at higher frequencies than upstream transmission (see A.5.1.2, B.2.3, C.4.1.4 and C.4.2.4). It should be noted that the annexes to this Recommendation describe different variations of the same protocol layer
41、s, for use in different IT regions. Connectivity between these variations, however, can be supported by telecommunications and computer standards in the public domain, which are well-established and widely used. It should be further noted that there exists two Supplements to the J-series Recommendat
42、ions related to Rec. J.112 which are entitled: - Supplement 1 - Example of linking options between annexes of ITU-T Recommendation J.112 and annexes of ITU-T Recommendation 5.83; Supplement 2 - Guidelines for the use of Annex A of Recommendation J.112 “Transmission systems for interactive cable tele
43、vision services“; Example of Digital Video Broadcasting (DVB) interaction channel for cable television distribution. - vi Recommendation 5.112 (03/98) COPYRIGHT International Telecommunications Union/ITU TelecommunicationsLicensed by Information Handling ServicesSTDSITU-T RECMN J*LLZ-ENGL L998 4h259
44、L 0655023 TTL Recommendation 5.112 TRANSMISSION SYSTEMS FOR INTERACTIVE CABLE TELEVISION SERVICES (Geneva, 1998) 1 Scope This Recommendation “Transmission systems for interactive cable television services“ extends the scope of Recommendation J.83 “Digital multi-programme systems for television, soun
45、d and data services for cable distribution“ to make provision for bidirectional data over hybrid fibre-coax cables for interactive services. Like Recommen- dation J.83, this Recommendation also contains several annexes in recognition of different existing media environments. The annexes in this Reco
46、mmendation are intended to be read in conjunction with the corresponding annexes in Recommendation 5.83. Annex A is based on work done in Europe and is related to a wider set of options such as Recommendation J.lll and should provide a suitable basis for further developments. Annex B is based on wor
47、k done in North America and should provide a suitable basis for future developments. Annex C is based on work done in Japan and should provide a suitable basis for future developments. Whilst Annexes A, B and C correspond to A, B and C in Recommendation 5.83, there is substantial commonality in the
48、services and protocols supported. The reference architectures are also based on Recommendation J.110. There is therefore the possibility that, in application, the features chosen for use with the transmission system described in a particular annex of Recommendation 5.83 are not limited to only the c
49、orresponding annex of this Recommendation. 2 References The following ITU-T Recommendations and other references contain provisions which, through reference in this text, constitute provisions of this Recommendation. At the time of publication, the editions indicated were valid. All Recommendations and other references are subject to revision; all users of this Recommendation are therefore encouraged to investigate the possibility of applying the most recent edition of the Recommendations and other references listed below. A list of the currently valid ITU-T Recommendations is regularly
