1、 I n t e r n a t i o n a l T e l e c o m m u n i c a t i o n U n i o n ITU-T J.1102 TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU (08/2015) SERIES J: CABLE NETWORKS AND TRANSMISSION OF TELEVISION, SOUND PROGRAMME AND OTHER MULTIMEDIA SIGNALS Switched digital video over cable networks Interface spe
2、cifications for IP-based switched digital video using DOCSIS Recommendation ITU-T J.1102 Rec. ITU-T J.1102 (08/2015) i Recommendation ITU-T J.1102 Interface specifications for IP-based switched digital video using DOCSIS Summary Recommendation ITU-T J.1102 describes the interface specifications for
3、IP-based switched digital video (SDV) using data over cable service interface specifications (DOCSIS) in a digital cable network. The cable broadcasting system has been changed to use resources efficiently and to transmit said resources in such a way that the varying needs of subscribers are easily
4、accommodated. The interface specifications described in this Recommendation are defined according to Recommendation ITU-T J.1101, Functional requirements for IP-based switched digital video using data over cable service interface specifications. These specifications are designed to maintain quality
5、of service (QoS) while using bandwidth effectively in a hybrid fiber/coaxial (HFC) network environment. History Edition Recommendation Approval Study Group Unique ID* 1.0 ITU-T J.1102 2015-08-13 9 11.1002/1000/12571 _ * To access the Recommendation, type the URL http:/handle.itu.int/ in the address
6、field of your web browser, followed by the Recommendations unique ID. For example, http:/handle.itu.int/11.1002/1000/11830-en. ii Rec. ITU-T J.1102 (08/2015) FOREWORD The International Telecommunication Union (ITU) is the United Nations specialized agency in the field of telecommunications, informat
7、ion 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 standardizing telecommunications on a worldw
8、ide 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 by the procedure laid down in WTS
9、A 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 both a telecommunication administ
10、ration 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 when all of these mandatory provisi
11、ons 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 PROPERTY RIGHTSITU draws attention to t
12、he 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 by ITU members or others outside
13、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 this may not represent the latest
14、 information and are therefore strongly urged to consult the TSB patent database at http:/www.itu.int/ITU-T/ipr/. ITU 2015 All rights reserved. No part of this publication may be reproduced, by any means whatsoever, without the prior written permission of ITU. Rec. ITU-T J.1102 (08/2015) iii Table o
15、f Contents Page 1 Scope . 1 2 References . 1 3 Definitions 1 3.1 Terms defined elsewhere 1 3.2 Terms defined in this Recommendation . 1 4 Abbreviations and acronyms 1 5 Conventions 3 6 IP-based SDV reference model 3 6.1 Transmission function 4 6.2 Subscriber function . 4 7 Interface structure . 5 7.
16、1 SDI-1 5 7.2 SDI-2 5 7.3 SDI-3 6 7.4 SCI-1 . 6 7.5 SCI-2 . 6 7.6 SCI-3 . 6 7.7 SCI-4 . 6 8 Interface specification . 6 8.1 Session management function 6 8.2 Resource management function . 9 Bibliography. 10 Rec. ITU-T J.1102 (08/2015) 1 Recommendation ITU-T J.1102 Interface specifications for IP-ba
17、sed switched digital video using DOCSIS 1 Scope This Recommendation defines the interface specifications of the IP-based switched digital video (SDV) using data over cable service interface specification (DOCSIS). The interface specifications described in this Recommendation are defined according to
18、 ITU-T J.1101. The interface specifications described in this Recommendation are defined as follows: management interface specification for the session management function management interface specification for the resource management function. 2 References The following ITU-T Recommendations and ot
19、her 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 encourage
20、d 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 documen
21、t, the status of a Recommendation. ITU-T J.222.1 Recommendation ITU-T J.222.1 (2007), Third-generation transmission systems for interactive cable television services IP cable modems: Physical layer specification. ITU-T J.222.2 Recommendation ITU-T J.222.2 (2007), Third-generation transmission system
22、s for interactive cable television services IP cable modems: MAC and Upper Layer protocols. ITU-T J.1101 Recommendation ITU-T J.1101 (2012), Functional requirements for IP-based switched digital video using data over cable service interface specifications. 3 Definitions 3.1 Terms defined elsewhere N
23、one. 3.2 Terms defined in this Recommendation This Recommendation defines the following term: 3.2.1 IP-based switched digital video (SDV): Service mechanism to provide interfaces and functionalities to enable cable television system operators to offer QoS-guaranteed broadcasting and multicasting. 4
24、Abbreviations and acronyms This Recommendation uses the following abbreviations and acronyms: CCP Channel Charge Protocol CM Cable Modem CMTS Cable Modem Termination System 2 Rec. ITU-T J.1102 (08/2015) CRC Cyclic Redundancy Check DA Destination Address DC Downstream Channel DCID Downstream Channel
25、Identifier DEPI Downstream External PHY Interface DMPI DOCSIS MAC-PHY Interface DOCSIS Data Over Cable Service Interface Specifications DRFI Downstream Radio Frequency Interface DS Downstream DSID Downstream Service Identifier EH Extended Header EHDR Extended MAC Header FC Frame Control FEC Forward
26、Error Correction FTP File Transfer Protocol GBE Giga Bit Ethernet HCS Header Check Sequence HFC Hybrid Fiber/Coaxial IGMP Internet Group Management Protocol IP Internet Protocol IPC Inter Process Communications LAN Local Area Network MAC Media Access Control M-CMTS Modular Cable Modem Termination Sy
27、stem MDD MAC Domain Descriptor MIB Management Information Base MPEG Moving Picture Experts Group MSB Most Significant Bit NSI Network Service Interface PDU Protocol Data Unit PHY Physical Layer PID Packet Identifier QAM Quadrature Amplitude Modulation QoS Quality of Service RPC Remote Procedure Call
28、 SA Source Address SCI IP-based SDV Control Interface Rec. ITU-T J.1102 (08/2015) 3 SDI IP-based SDV Data Interface SDV Switched Digital Video SF Service Flow SFID Service Flow Identifier SID Service Identifier SIP Session Initiation Protocol STB Set-Top Box VSI Video Service Interface 5 Conventions
29、 In this Recommendation: The keywords “is required to“ indicate a requirement which must be strictly followed and from which no deviation is permitted if conformance to this document is to be claimed. The keywords “is recommended“ indicate a requirement which is recommended but which is not absolute
30、ly required. Thus this requirement need not be present to claim conformance. The keywords “is prohibited from“ indicate a requirement which must be strictly followed and from which no deviation is permitted if conformance to this document is to be claimed. The keywords “can optionally“ indicate an o
31、ptional requirement which is permissible, without implying any sense of being recommended. This term is not intended to imply that the vendors implementation must provide the option and the feature can be optionally enabled by the network operator/service provider. Rather, it means the vendor may op
32、tionally provide the feature and still claim conformance with the specification. In the body of this Recommendation and its annexes, the words shall, shall not, should, and may sometimes appear, in which case they are to be interpreted, respectively, as is required to, is prohibited from, is recomme
33、nded, and can optionally. The appearance of such phrases or keywords in an appendix or in material explicitly marked as informative are to be interpreted as having no normative intent. 6 IP-based SDV reference model As shown in Figure 1, functionally IP-based SDV using the DOCSIS system can be categ
34、orized into three parts: the transmission function the subscriber function the control function. 4 Rec. ITU-T J.1102 (08/2015) Figure 1 Diagram of an IP-based switched digital video system 6.1 Transmission function The transmission function processes the DOCSIS frame header and transmits it to the m
35、ulticast service group. The transmission function consists of an SDV transmission function and a downstream PHY function. The SDV transmission function processes service flow and packet header processing on the DOCSIS MAC layer ITU-T J.222.2. The downstream PHY function transmits the DOCSIS header p
36、rocessed video stream to the subscriber. 6.1.1 SDV transmission function The SDV transmission function processes service flow and does packet header processing on the DOCSIS MAC layer. 6.1.2 Downstream PHY function The downstream PHY ITU-T J.222.1 function transmits the DOCSIS header processed video
37、 stream to the subscriber. 6.2 Subscriber function The subscriber function processes the video data stream from the transmission function. The subscriber function consists of the SDV client service function and SDV receiver function. The subscriber function also sends request information of an SDV v
38、ideo service programme to the control function. 6.2.1 SDV client function The SDV client function recovers an IP-based received video data stream from an MPEG-2 based video stream and outputs it to the set-top box (STB). 6.2.2 SDV receiver function The SDV receiver function processes physical signal
39、 processing; it is a function of the DOCSIS cable modem. Rec. ITU-T J.1102 (08/2015) 5 7 Interface structure IP-based SDV system is required to consist of IP-based SDV data interface (SDI) and IP-based SDV control interface (SCI). The SDI-1 provides the interface between the IP-based SDV transmissio
40、n module and head-end local network. The SDI-2 provides the interface between MAC and PHY in the IP-based SDV transmission module. The SDI-3 provides the interface between the IP-based SDV transmission module and the modular cable modem termination system (M-CMTS). The SCI-1 provides the interface b
41、etween the set-top box (STB) and the session management server. The SCI-2 provides the interface between the session management server and the resource management server. The SCI-3 provides the interface between the resource management server and the M-CMTS. The SCI-4 provides the interface between
42、the M-CMTS and the IP-based SDV transmission module. The interface structure of the IP-based SDV is shown in Figure 2. Figure 2 The interface structure of IP-based SDV 7.1 SDI-1 The SDI-1 is defined as the interface specification between the SDV transmission module and the headend local network syst
43、em. The SDI-1 is recommended to transmit the IP-based video data stream of the backbone network or local area network (LAN) to the IP-based transmission module. The headend local network system is recommended to connect the session and resource management server using IP protocol. The headend local
44、system is recommended to connect the control and management of the SDV transmission module using IP protocol. 7.2 SDI-2 The SDI-2 is defined as the internal interface specification between the MAC and the PHY submodules in the SDV transmission module. The SDI-2 is recommended to connect between the
45、MAC function submodule and the downstream PHY submodule. The SDI-2 is recommended to transmit the DOCSIS MAC frame which is created in the SDV transmission module to the frequency channel using the downstream PHY submodule. The transmission of the DOCSIS MAC frame to the downstream PHY submodule is
46、recommended to support three formats as follows: DOCSIS MAC over MPEG-2 TS DOCSIS MAC over MPEG-2 TS over IP 6 Rec. ITU-T J.1102 (08/2015) DOCSIS MAC over IP 7.3 SDI-3 The SDI-3 is defined as the interface specification between the M-CMTS and the SDV transmission module. The SDI-3 consists of two in
47、terfaces as follows: Downstream MAC/PHY interface Upstream MAC/PHY interface The SDI-3 is recommended to transmit the DOCSIS MAC frame to the downstream PHY transmission submodule of the SDV transmission module. The SDI-3 is recommended to transmit the information of the upstream burst stream to the
48、 MAC submodule. 7.4 SCI-1 The SCI-1 is defined as the control interface specification between the STB and the session management server. The SCI-1 is recommended to obtain the information of the programme channel and the IP group address. 7.5 SCI-2 The SCI-2 is defined as the control interface betwe
49、en the session management server and the resource management server. The SCI-2 is recommended to reserve the frequency channel resource. The SCI-2 is recommended to transmit the information of the transmission frequency and QoS. 7.6 SCI-3 The SCI-3 is defined as the control interface between the resource management server and the M-CMTS. The SCI-3 is recommended to manage the frequency channel resource. 7.7 SCI-4 The SCI-4 is defined as the control interface between the M-CMTS and the SDV transmission module. The SC
