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.223.1 TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU (03/2016) SERIES J: CABLE NETWORKS AND TRANSMISSION OF TELEVISION, SOUND PROGRAMME AND OTHER MULTIMEDIA SIGNALS Interactive systems for digital television distribution
2、 Functional requirements for Cabinet DOCSIS (C-DOCSIS) Recommendation ITU-T J.223.1 Rec. ITU-T J.223.1 (03/2016) i Recommendation ITU-T J.223.1 Functional requirements for Cabinet DOCSIS (C-DOCSIS) Summary Recommendation ITU-T J.223.1 specifies the functional requirements of C-DOCSIS over coaxial ne
3、twork in cable industry. This Recommendation contains descriptions for functional requirements of general system, physical layer and MAC layer function over coaxial network. History Edition Recommendation Approval Study Group Unique ID* 1.0 ITU-T J.223.1 2016-03-15 9 11.1002/1000/12769 * To access t
4、he Recommendation, type the URL http:/handle.itu.int/ in the address 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.223.1 (03/2016) FOREWORD The International Telecommunication Union (ITU) is the United N
5、ations specialized agency in the field 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 Recommendatio
6、ns on them with a view to standardizing 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
7、 of ITU-T Recommendations is covered 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“
8、 is used for conciseness to indicate 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 w
9、ith the Recommendation is achieved when 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 requi
10、red of any party. INTELLECTUAL PROPERTY RIGHTSITU 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 Intellectu
11、al Property Rights, whether asserted 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. Howe
12、ver, implementers are cautioned that 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 2016 All rights reserved. No part of this publication may be reproduced, by any means whatsoever, without the pr
13、ior written permission of ITU. Rec. ITU-T J.223.1 (03/2016) iii Table of 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 2 5 Conventions 3 6 Architecture 3 7 Requirement 4 7.1 Functiona
14、l requirement . 4 7.2 Requirement of PHY Layer 4 7.3 Requirement of MAC Layer . 4 Bibliography. 5 Rec. ITU-T J.223.1 (03/2016) 1 Recommendation ITU-T J.223.1 Functional requirements for Cabinet DOCSIS (C-DOCSIS) 1 Scope This Recommendation specifies the functional requirements of Cabinet DOCSIS (C-D
15、OCSIS) for high-speed data transmission over coaxial network in cable industry. 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 indic
16、ated were valid. All Recommendations and other references are subject to revision; 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 Re
17、commendations 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.112 Annex B Recommendation ITU-T J.112 Annex B (2004), Transmission systems for interactive cable television services. Ann
18、ex B: Data-over-cable service interface specifications: Radio-frequency interface specification. 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 Recommendat
19、ion ITU-T J.222.2 (2007), Third-generation transmission systems for interactive cable television services IP cable modems: MAC and Upper Layer protocols. 3 Definitions 3.1 Terms defined elsewhere This Recommendation uses the following terms defined elsewhere: 3.1.1 service flow ITU-T J.112 Annex B:
20、A MAC-layer transport service which: provides unidirectional transport of packets from the upper layer service entity to the radio frequency (RF); shapes, polices, and prioritizes traffic according to quality of service (QoS) traffic parameters defined for the Flow. 3.2 Terms defined in this Recomme
21、ndation This Recommendation defines the following terms: 3.2.1 access control: Access control is used to control the cable modems (CMs) defined in this document to access networks. It is a process for connecting cable media converters (CMCs) and controlling data communication. 3.2.2 aggregation and
22、forwarding: An aggregation network device, such as a passive optical network (PON) optical line terminal (OLT), a router, or a switch, receives data from CMCs and forwards the data to different uplinks for transmission based on the preset QoS priorities. 3.2.3 C-DOCSIS system: The C-DOCSIS system co
23、nsists of the CMC controller, CMC, and C-DOCSIS CM. It implements broadband data access and forwarding, service configuration, as well as management and maintenance of coaxial cable networks. 2 Rec. ITU-T J.223.1 (03/2016) 3.2.4 CMC: The cable media converter (CMC) converts data from a coaxial cable
24、 network to a packet digital optical network (such as PON or Ethernet). The CMC connects to a cable modem (CM) through the coaxial cable network in the downstream direction and to the CMC controller through the packet digital optical network in the upstream direction. 3.2.5 CMC controller: The CMC c
25、ontroller forwards upstream and downstream service data and manages the configuration of the CMC. 3.2.6 service flow tagging: The service flow tagging is a method of using tags to indicate the service flow to which a packet has been classified. 4 Abbreviations and acronyms This Recommendation uses t
26、he following abbreviations and acronyms: C-DOCSIS Cabinet DOCSIS CM Cable Modem CMC Cable Media Converter CMTS Cable Modem Termination System CPE Customer Premises Equipment DHCP Dynamic Host Configuration Protocol DOCSIS Data over Cable Service Interface Specification DTV Digital Television MAC Med
27、ia Access Control NMS Network Management System OLT Optical Line Terminal PHY Physical Layer PON Passive Optical Network QoS Quality of Service RF Radio Frequency RFI Radio Frequency Interface S-CDMA Synchronous Code Division Multiple Access SNMP Simple Network Management Protocol VoIP Voice over IP
28、 5 Conventions 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 Recommendation is to be claimed. The keywords “is recommended“ indicate a requirement which is recommended but w
29、hich is not absolutely 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 Recommendation is to be claimed. Rec. ITU-T J.223.
30、1 (03/2016) 3 The keywords “can optionally“ indicate an optional 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 oper
31、ator/service provider. Rather, it means the vendor may optionally 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, respec
32、tively, as is required to, is prohibited from, is recommended, 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 Architecture The logic architecture model of C-DOCSIS re
33、fers to Figure 1. In a C-DOCSIS system, the CMC controller manages the configuration of the CMC and/or forwards upstream and downstream service data. The CMC converts and forwards the upstream and downstream service data and the management and configuration data of the CMs. The CM terminates the ups
34、tream and downstream service data, as well as receive and respond to management and configuration data. The CMC controller connects to the CMC through a digital optical packet network. The CMC connects to the CMs through a coax RF network or HFC network. The configuration system configures services
35、and devices on the C-DOCSIS system. It generates and issues configuration files and upgrades the software of the CMs. The configuration system consists of the dynamic host configuration protocol (DHCP) server, configuration file server, software downloading server, and time protocol server. The netw
36、ork management system (NMS) consists of the simple network management protocol (SNMP) management system and the Syslog server. Figure 1 C-DOCSIS System C-DOCSIS specifies three different types of CMC controllers and CMCs to implement the C-DOCSIS cable modem termination system (CMTS). Type I CMC imp
37、lements all the DOCSIS CMTS functions, and type I CMC controller implements high-level and partial-system management and configuration functions. Type II CMC implements the data forwarding and CM access functions, and Type II CMC controller implements the system management, configuration, and schedu
38、ling functions. Type III CMC only implements the C-DOCSIS, CMTS, 0PHY) function and the CMC controller implements the rest of the functions of the C-DOCSIS CMTS. 4 Rec. ITU-T J.223.1 (03/2016) 7 Requirement 7.1 Functional requirement C-DOCSIS-Gen-1 C-DOCSIS is required to be applied to the coaxial a
39、ccess network or HFC network. C-DOCSIS-Gen-2 C-DOCSIS is required to support centralized network administration. C-DOCSIS-Gen-3 C-DOCSIS is required to have an interface for service flow tagging among different modules, and provide a QoS guarantee for the system. C-DOCSIS-Gen-4 C-DOCSIS is required
40、to support any IP-based services such as IPTV, interactive services, voice over IP (VoIP), and Internet access. C-DOCSIS-Gen-5 C-DOCSIS is required not to affect any existing analogue television, digital television (DTV) or data services. C-DOCSIS-Gen-6 C-DOCSIS is required to support channel bundle
41、. C-DOCSIS-Gen-7 C-DOCSIS is required to be compatible with a DOCSIS 1.x or DOCSIS 2.0 cable modem. 7.2 Requirement of PHY Layer C-DOCSIS-PHY-1 The PHY layer of C-DOCSIS is required to be compatible with DOCSIS 3.0 in ITU-T J.222.1, except that the synchronous code division multiple access (S-CDMA)
42、is optional. 7.3 Requirement of MAC Layer C-DOCSIS-MAC-1 The media access control (MAC) layer of C-DOCSIS is required to be compatible with DOCSIS 3.0 in ITU-T J.222.2. Rec. ITU-T J.223.1 (03/2016) 5 Bibliography b-ITU-T J.222.0 Recommendation ITU-T J.222.0 (2007), Third-generation transmission syst
43、ems for interactive cable television services IP cable modems: Overview. b-ITU-T J.222.3 Recommendation ITU-T J.222.3 (2007), Third-generation transmission systems for interactive cable television services IP cable modems: Security services. b-CM-SP-CDOCSIS-I02-150305 CM-SP-CDOCSIS-I02-150305 (2015)
44、, C-DOCSIS System Specification b-ETSI ES 203 312 ETSI ES 203 312 V1.1.1 (2015), Integrated broadband cable telecommunication networks (CABLE); Cabinet DOCSIS (C-DOCSIS) System Specification. Printed in Switzerland Geneva, 2016 SERIES OF ITU-T RECOMMENDATIONS Series A Organization of the work of ITU
45、-T Series D General tariff principles Series E Overall network operation, 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
46、I Integrated services digital network Series J Cable networks and transmission of television, sound programme and other multimedia signals Series K Protection against interference Series L Environment and ICTs, climate change, e-waste, energy efficiency; construction, installation and protection of
47、cables and other elements of outside plant Series M Telecommunication management, including TMN and network maintenance Series N Maintenance: international sound programme and television transmission circuits Series O Specifications of measuring equipment Series P Terminals and subjective and object
48、ive assessment methods Series Q Switching and signalling Series R Telegraph transmission Series S Telegraph services 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, Internet of Things and smart cities Series Z Languages and general software aspects for telecommunication systems
