1、 International Telecommunication Union ITU-T J.222.2TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU (07/2007) 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: MAC and Upper Layer protocols Volume 1: Core Recommendation Recommendation ITU-T J.222.2 Rec. ITU-T J.222.2 (07/2007) i Recommendation ITU-T J.222.2 Third-generation transmission systems for interactive cable television services IP cab
3、le modems: MAC and Upper Layer protocols Summary ITU-T Recommendation J.222.2 is part of a series of Recommendations that define the third generation of high-speed data-over-cable systems. This Recommendation was developed for the benefit of the cable industry, and includes contributions by operator
4、s and vendors from North America, Europe and other regions. The third-generation transmission systems introduce a number of new features that build upon what was present in previous Recommendations (ITU-T Recommendations J.112 and J.122). This Recommendation includes key new features for the MAC and
5、 Upper Layer Protocols Interface, and defines the MAC layer protocols as well as requirements for upper layer protocols (e.g., IP, DHCP, etc.). ITU-T Recommendation J.222.2 has been published in two volumes. Volume 1 contains the core Recommendation and Volume 2 contains the annexes and appendices.
6、This is Volume 1. Source Recommendation ITU-T J.222.2 was approved on 29 July 2007 by ITU-T Study Group 9 (2005-2008) under Recommendation ITU-T A.8 procedure. ii Rec. ITU-T J.222.2 (07/2007) FOREWORD The International Telecommunication Union (ITU) is the United Nations specialized agency in the fie
7、ld of telecommunications, information and communication technologies (ICTs). The ITU 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 standardiz
8、ing telecommunications on a worldwide basis. The World Telecommunication Standardization 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
9、 by the procedure laid down in WTSA Resolution 1. In some areas of information technology 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
10、 both a telecommunication administration and a recognized operating agency. Compliance 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 whe
11、n all of these mandatory provisions are met. The words “shall“ or some other obligatory 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 PROPERT
12、Y RIGHTS ITU draws attention to the possibility that the practice or implementation of 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
13、by ITU members or others outside of the Recommendation development process. As of the 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
14、this may not represent the latest information and are therefore strongly urged to consult the TSB patent database at http:/www.itu.int/ITU-T/ipr/. ITU 2009 All rights reserved. No part of this publication may be reproduced, by any means whatsoever, without the prior written permission of ITU. Rec. I
15、TU-T J.222.2 (07/2007) iii CONTENTS CONTENTS OF VOLUME 1 Page 1 Scope 1 2 References. 1 2.1 Normative References 1 2.2 Informative References 4 2.3 Reference Acquisition 4 3 Definitions 5 4 Abbreviations, acronyms and conventions. 7 4.1 Abbreviations and Acronyms . 7 4.2 Conventions 13 5 Overview an
16、d Theory of Operations 14 5.1 DOCSIS 3.0 MULPI Key Features 14 5.2 Technical Overview 14 6 Media Access Control Specification 36 6.1 Introduction 36 6.2 MAC Frame Formats 40 6.3 Segment Header Format. 59 6.4 MAC Management Messages. 60 7 Media Access Control Protocol Operation. 147 7.1 Timing and Sy
17、nchronization 147 7.2 Upstream Data Transmission . 151 7.3 Upstream Downstream Channel Association within a MAC Domain 188 7.4 DSID Definition . 189 7.5 Quality of Service. 190 7.6 Downstream Traffic Priority 217 7.7 Payload Header Suppression 218 7.8 Data Link Encryption Support 228 8 Channel bondi
18、ng. 229 8.1 Upstream and Downstream Common Aspects. 229 8.2 Downstream Channel Bonding. 234 8.3 Upstream Channel Bonding . 248 9 Data Forwarding . 250 9.1 General Forwarding Requirements. 250 9.2 Multicast Forwarding . 256 10 Cable Modem CMTS Interaction 276 10.1 CMTS Initialization 276 10.2 Cable M
19、odem Initialization and Reinitialization . 276 iv Rec. ITU-T J.222.2 (07/2007) Page 10.3 Periodic Maintenance . 329 10.4 Fault Detection and Recovery 332 10.5 DOCSIS Path Verification . 336 11 Dynamic Operations . 340 11.1 Upstream Channel Descriptor Changes 340 11.2 Dynamic Service Flow Changes 342
20、 11.3 Pre-3.0 DOCSIS Upstream Channel Changes 377 11.4 Dynamic Downstream and/or Upstream Channel Changes . 380 11.5 Dynamic Bonding Change (DBC) 396 11.6 Autonomous Load Balancing. 416 12 Supporting Future New Cable Modem Capabilities. 422 12.1 Downloading Cable Modem Operating Software 422 CONTENT
21、S OF VOLUME 2 Annex A Well-Known Addresses. 424 A.1 Addresses 424 A.2 MAC Service IDs . 424 A.3 MPEG PID 425 Annex B Parameters and Constants 426 Annex C Common Radio Frequency Interface Encodings. 431 C.1 Encodings for Configuration and MAC-Layer Messaging 433 C.2 Quality-of-Service-Related Encodin
22、gs. 488 C.3 Encodings for Other Interfaces. 518 C.4 Confirmation Code . 518 Annex D CM Configuration Interface Specification 525 D.1 CM Configuration 525 D.2 Configuration Verification . 529 Annex E Standard Receive Channel Profile Encodings . 532 Annex F The DOCSIS MAC/PHY Interface (DMPI) 538 F.1
23、Scope 538 F.2 Conventions 538 F.3 Overview 539 F.4 Signals 543 F.5 Protocol. 546 F.6 Electrical Specifications . 550 F.7 Timing Specifications. 551 Rec. ITU-T J.222.2 (07/2007) v Page F.8 Data Format and Usage 552 Annex G Compatibility with Previous Versions of DOCSIS. 562 G.1 General Interoperabili
24、ty Issues. 562 G.2 Support for Hybrid Devices 578 G.3 Upstream Physical Layer Interoperability 579 G.4 Multicast Support for Interaction with Pre-3.0 DOCSIS Devices . 580 Annex H DHCPv6 Vendor Specific Information Options for DOCSIS 3.0. 592 H.1 CL Option Request option 592 H.2 Reserved option codes
25、 593 H.3 TFTP Server Addresses option. 593 H.4 Configuration File Name option. 594 H.5 Syslog Server Addresses option . 594 H.6 TLV5 Encoding 595 H.7 DOCSIS Device Identifier option 595 H.8 CL client configuration. 595 H.9 Format of the Time Protocol Servers option 596 H.10 Time Offset option . 597
26、H.11 Relay Agent Options 597 Annex I (Set Aside). 600 Annex J DHCPv4 Vendor Identifying Vendor Specific Options for DOCSIS 3.0 601 J.1 DOCSIS Vendor Identifying Vendor Specific relay agent options 601 J.2 The CL DHCPv4 Option Request option. 601 J.3 The DHCPv4 TFTP Servers option 601 J.4 The DHCPv4
27、Relay Agent CMTS capabilities option. 602 Annex K DHCP Information Options for DOCSIS 3.0 604 K.1 DHCP Options used by the CM . 604 Annex L The Data-Over-Cable Spanning Tree Protocol 606 L.1 Background. 606 L.2 Public Spanning Tree . 606 L.3 Public Spanning Tree Protocol Details. 607 L.4 Spanning Tr
28、ee Parameters and Defaults. 608 Appendix I MAC Service Definition 609 I.1 MAC Service Overview . 609 I.2 MAC Data Service Interface 611 I.3 MAC Control Service Interface 616 I.4 MAC Service Usage Scenarios 618 Appendix II Plant Topologies. 620 II.1 Single Downstream and Single Upstream per Cable Seg
29、ment 620 II.2 Multiple Downstreams and Multiple Upstreams per Cable Segment 622 vi Rec. ITU-T J.222.2 (07/2007) Page Appendix III DOCSIS Transmission and Contention Resolution 626 III.1 Multiple Transmit Channel Mode 626 III.2 Non-Multiple Transmit Channel Mode 630 Appendix IV Unsolicited Grant Serv
30、ices 635 IV.1 Unsolicited Grant Service (UGS). 635 IV.2 Unsolicited Grant Service with Activity Detection (UGS-AD). 637 IV.3 Multiple Transmit Channel Mode Considerations for Unsolicited Grant Services. 640 Appendix V Error Recovery Examples 641 Appendix VI SDL Notation 643 Appendix VII Notes on Add
31、ress Configuration in DOCSIS 3.0 644 Appendix VIII IP Multicast Replication Examples 645 VIII.1 Scenario I: First Multicast Client joiner to a multicast session (Start of a new Multicast Session). 646 VIII.2 Scenario II: A Multicast Client joining an existing multicast session that is being forwarde
32、d bonded, with FC-Type 10 (Typical 3.0 Multicast Mode of Operation) 650 VIII.3 Scenario III: A Multicast Client behind a 2.0 CM joining an existing multicast session being forwarded bonded, with FC-Type 00 to a client behind a Hybrid CM w/o FC 10. 657 Appendix IX IGMP Example for DOCSIS 2.0 Backward
33、s Compatibility Mode 660 IX.1 Events . 660 IX.2 Actions 660 Appendix X CM Multicast DSID Filtering Summary 661 Appendix XI Example DHCPv6 Solicit Message Contents . 663 Appendix XII Dynamic Operations Examples . 664 XII.1 Dynamic Channel Change Example Operation 664 XII.2 Dynamic Bonding Change Exam
34、ple Operation . 669 XII.3 Autonomous Load Balancing Example 671 Rec. ITU-T J.222.2 (07/2007) 1 Recommendation ITU-T J.222.2 Third-generation transmission systems for interactive cable television services IP cable modems: MAC and Upper Layer protocols 1 Scope This Recommendation is part of a series o
35、f Recommendations that define the third generation of high-speed data-over-cable systems. The third-generation transmission systems introduce a number of new features that build upon what was present in previous Recommendations ITU-T J.112 and ITU-T J.122. This Recommendation includes key new featur
36、es for the MAC and Upper Layer Protocols Interface, and defines the MAC layer protocols as well as requirements for upper layer protocols (e.g., IP, DHCP, etc.). Please see ITU-T J.222.1 for the background and overview of the DOCSIS 3 family of Recommendations. NOTE The structure and content of this
37、 Recommendation have been organized for ease of use by those familiar with the original source material; as such, the usual style of ITU-T recommendations has not been applied. 2 References 2.1 Normative References The following ITU-T Recommendations and other references contain provisions which, th
38、rough 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 encouraged to investigate the possibility of applyin
39、g 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 document, the status of a Recommendation. ITU-T J.
40、112 Recommendation ITU-T J.112, Data-Over-Cable Service Interface Specifications, Radio Frequency Interface Specification v1.1. ITU-T J.122 Recommendation ITU-T J.122, Data-Over-Cable Service Interface Specifications, Radio Frequency Interface Specification v2.0. ITU-T J.126 Recommendation ITU-T J.1
41、26, eDOCSIS Specification. ITU-T J.162 Recommendation ITU-T J.162, Network call signalling protocol for the delivery of time-critical services over cable television networks using cable modems. ITU-T J.163 Recommendation ITU-T J.163, Dynamic quality of service for the provision of real-time services
42、 over cable television networks using cable modems. ITU-T J.179 Recommendation ITU-T J.179, IPCablecom Multimedia Specification. ITU-T J.210 Recommendation ITU-T J.210, Downstream RF interface for cable modem Termination Systems. ITU-T J.211 Recommendation ITU-T J.211, Timing interface for cable mod
43、em termination systems. ITU-T J.212 Recommendation ITU-T J.212, Downstream external PHY Interface for Modular Cable Modem Termination Systems. 2 Rec. ITU-T J.222.2 (07/2007) ITU-T J.213 Recommendation ITU-T J.213, Layer 2 virtual private networks for IP cable modem systems. ITU-T J.222.1 Recommendat
44、ion ITU-T J.222.1, DOCSIS 3.0, Physical Layer Specification for third generation transmission systems for interactive cable television services IP cable modems. ITU-T J.222.3 Recommendation ITU-T J.222.3, Security services for third-generation transmission systems for interactive cable television se
45、rvices IP cable modems. ITU-T X.25 Recommendation ITU-T X.25, Interface between Data Terminal Equipment (DTE) and Data Circuit-terminating Equipment (DCE) for terminals operating in the packet mode and connected to public data networks by dedicated circuit. ITU-T Z.100 Recommendation ITU-T Z.100 (20
46、02), Formal description techniques (FDT) Specification and Description Language (SDL). SCTE 79-2 ANSI/SCTE 79-2-2002 DOCSIS 2.0, Operations Support System Interface. IEEE 802.1D IEEE 802.1D-2004, IEEE standard for local and metropolitan area networks-Media access control (MAC) Bridges (Incorporates
47、IEEE 802.1t-2001 and IEEE 802.1w). ISO/IEC 8802-2 ISO/IEC 8802-2:1998, Information technology, Telecommunications and information exchange between systems, Local and metropolitan area networks, Specific requirements. Part 2: Logical link control. ISO/IEC 8802-3 ISO/IEC 8802-3:2000, Information techn
48、ology, Telecommunications and information exchange between systems, Local and metropolitan area networks, Specific requirements, Part 3: Carrier sense multiple access with collision detection (CSMA/CD) access method and physical layer specifications. ISO/IEC 8825-1 ISO/IEC 8825-1:2002, Information t
49、echnology, ASN.1 encoding rules: Specification of Basic Encoding Rules (BER), Canonical Encoding Rules (CER) and Distinguished Encoding Rules (DER), Ed. #3. ISO/IEC10038 ISO/IEC 10038 (ANSI/IEEE Std 802.1D):1993, Information technology -Telecommunications and information exchange between systems Local area networks Media access control (MAC) bridges. RFC 768 IETF RFC 768, J. Postel, User Datagram Protocol, August 1980. RFC 868 IETF RFC 868, (STD0026) J. Postel, K. Harren
