1、 International Telecommunication Union ITU-T J.222.0TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU (12/2007) SERIES J: CABLE NETWORKS AND TRANSMISSION OF TELEVISION, SOUND PROGRAMME AND OTHER MULTIMEDIA SIGNALS Interactive systems for digital television distribution Third-generation transmission sy
2、stems for interactive cable television services IP cable modems: Overview ITU-T Recommendation J.222.0 ITU-T Rec. J.222.0 (12/2007) i ITU-T Recommendation J.222.0 Third-generation transmission systems for interactive cable television services IP cable modems: Overview Summary ITU-T Recommendation J.
3、222.0 identifies the three components of the third generation of transmission systems for interactive cable television services. They are defined in detail in ITU-T Recommendations J.222.1, J.222.2 and J.222.3, respectively. Source ITU-T Recommendation J.222.0 was approved on 14 December 2007 by ITU
4、-T Study Group 9 (2005-2008) under the ITU-T Recommendation A.8 procedure. ii ITU-T Rec. J.222.0 (12/2007) FOREWORD The International Telecommunication Union (ITU) is the United Nations specialized agency in the field of telecommunications, information and communication technologies (ICTs). The ITU
5、Telecommunication Standardization Sector (ITU-T) is a permanent organ of ITU. ITU-T is responsible for studying technical, operating and tariff questions and issuing Recommendations on them with a view to standardizing telecommunications on a worldwide basis. The World Telecommunication Standardizat
6、ion Assembly (WTSA), which meets every four years, establishes the topics for study by the ITU-T study groups which, in turn, produce Recommendations on these topics. The approval of ITU-T Recommendations is covered by the procedure laid down in WTSA Resolution 1. In some areas of information techno
7、logy which fall within ITU-Ts purview, the necessary standards are prepared on a collaborative basis with ISO and IEC. NOTE In this Recommendation, the expression “Administration“ is used for conciseness to indicate both a telecommunication administration and a recognized operating agency. Complianc
8、e with this Recommendation is voluntary. However, the Recommendation may contain certain mandatory provisions (to ensure e.g. interoperability or applicability) and compliance with the Recommendation is achieved when all of these mandatory provisions are met. The words “shall“ or some other obligato
9、ry language such as “must“ and the negative equivalents are used to express requirements. The use of such words does not suggest that compliance with the Recommendation is required of any party. INTELLECTUAL PROPERTY RIGHTS ITU draws attention to the possibility that the practice or implementation o
10、f this Recommendation may involve the use of a claimed Intellectual Property Right. 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
11、 date of approval of this Recommendation, ITU had not received notice of intellectual property, protected by patents, which may be required to implement this Recommendation. However, implementers are cautioned that this may not represent the latest information and are therefore strongly urged to con
12、sult the TSB patent database at http:/www.itu.int/ITU-T/ipr/. ITU 2008 All rights reserved. No part of this publication may be reproduced, by any means whatsoever, without the prior written permission of ITU. ITU-T Rec. J.222.0 (12/2007) iii CONTENTS Page 1 Scope 1 2 References. 1 3 Definitions 1 4
13、Abbreviations and acronyms 1 5 Conventions 1 6 Overview of the third-generation transmission system 2 ITU-T Rec. J.222.0 (12/2007) 1 ITU-T Recommendation J.222.0 Third-generation transmission systems for interactive cable television services IP cable modems: Overview 1 Scope This Recommendation is a
14、n overview of the third generation of transmission systems for interactive cable television systems. It identifies the three components specifying the physical layer interface, the MAC and upper layer protocols interfaces and the security services. 2 References The following ITU-T Recommendations an
15、d 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; users of this Recommendation are therefore encou
16、raged 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 published. The reference to a document within this Recommendation does not give it, as a stand-alone doc
17、ument, the status of a Recommendation. ITU-T J.210 ITU-T Recommendation J.210 (2006), Downstream RF interface for cable modem termination systems. ITU-T J.222.1 ITU-T Recommendation J.222.1 (2007), Third-generation transmission systems for interactive cable television services IP cable modems: Physi
18、cal layer specification. ITU-T J.222.2 ITU-T Recommendation J.222.2 (2007), Third-generation transmission systems for interactive cable television services IP cable modems: MAC and upper layer protocols. ITU-T J.222.3 ITU-T Recommendation J.222.3 (2007), Third-generation transmission systems for int
19、eractive cable television services IP cable modems: Security services. 3 Definitions This Recommendation does not define any terms. 4 Abbreviations and acronyms This Recommendation does not define any new abbreviations and acronyms. 5 Conventions This Recommendation does not use any particular notat
20、ion, style, presentation, etc. 2 ITU-T Rec. J.222.0 (12/2007) 6 Overview of the third-generation transmission system This Recommendation provides an overview over a series of Recommendations that define the third generation of high-speed data-over-cable systems. Specifically, it identifies the Recom
21、mendations defining the physical layer interface ITU-T J.222.1, the MAC and upper layer protocol interfaces ITU-T J.222.2 and the security services ITU-T J.222.3. Additionally, ITU-T J.210 defines the downstream physical layer transmission specifications, which are applicable to the third generation
22、 of high-speed data-over-cable systems. The third-generation transmission system introduces a number of new features that build upon what was present in previous versions (ITU-T Recs J.112 and J.122). A summary of the series of Recommendations is provided in Table 6-1. All Recommendations are requir
23、ed to implement the third-generation transmission system for interactive cable television services. Table 6-1 Series of Recommendations for the third-generation transmission systems Designation Title J.222.1 Physical layer specification J.222.2 Media access control and upper layer protocols interfac
24、e specification J.222.3 Security services specification J.210 Downstream RF interface for cable modem termination systems Printed in Switzerland Geneva, 2008 SERIES OF ITU-T RECOMMENDATIONS Series A Organization of the work of ITU-T Series D General tariff principles Series E Overall network operati
25、on, telephone service, service operation and human factors Series F Non-telephone telecommunication services Series G Transmission systems and media, digital systems and networks Series H Audiovisual and multimedia systems Series I Integrated services digital network Series J Cable networks and tran
26、smission of television, sound programme and other multimedia signals Series K Protection against interference Series L Construction, installation and protection of cables and other elements of outside plant Series M Telecommunication management, including TMN and network maintenance Series N Mainten
27、ance: international sound programme and television transmission circuits Series O Specifications of measuring equipment Series P Telephone transmission quality, telephone installations, local line networks Series Q Switching and signalling Series R Telegraph transmission Series S Telegraph services
28、terminal equipment Series T Terminals for telematic services Series U Telegraph switching Series V Data communication over the telephone network Series X Data networks, open system communications and security Series Y Global information infrastructure, Internet protocol aspects and next-generation networks Series Z Languages and general software aspects for telecommunication systems
