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ITU-T J.225 (10/2022)

交互式有线电视业务的第四代传输系统 – IP电缆调制解调器

ITU-T J.225建议书定义了第四代高速电缆传输数据系统。第四代传输系统引入了许多新功能，这些功能是建立在以往的ITU-T J.112、ITU-T J.122、ITU-T J.222.x系列和ITU T J.223.x系列建议书基础之上。本建议书包括物理层（PHY）的关键新功能和对媒体访问控制（MAC）层协议的增强，以及对上层协议（如网际协议（IP）、动态主机配置协议（DHCP）等）的要求。第四代电缆调制解调器规范完全包含在本建议书中。ITU-T J系列建议书的信息增补10包含DOCSIS版本与ITU-T建议书修订版和各代之间的对应关系。注 – 为便于使用，本建议书的结构和内容是基于国际电联根据ITU-T A.5建议书对CableLabs的认可，通过直接引用原始资料进行的编排。

Citation:	https://handle.itu.int/11.1002/1000/15117
Series title:	J series: Cable networks and transmission of television, sound programme and other multimedia signals J.210-J.229: Interactive systems for digital television distribution (DOCSIS third to fifth generations)
Approval date:	2022-10-29
Provisional name:	J.4GDOCSIS
Approval process:	AAP
Status:	Superseded
Maintenance responsibility:	ITU-T Study Group 21
Further details:	Patent statement(s) Development history [6 related work items in progress]

EditionsRelated Supplement(s)

Ed.	ITU-T Recommendation	Status	Summary	Table of Contents	Download
4	J.225 (10/2024)	In force	here	here	here
3	J.225 (07/2023)	Superseded	here	here	here
2	J.225 (10/2022)	Superseded	here	here	here
1	J.225 (05/2020)	Superseded	here	here	here


ITU-T Supplement	Title	Status	Summary	Table of contents	Download
J Suppl. 1 (11/1998)	Example of linking options between annexes of ITU-T Recommendation J.112 and annexes of ITU-T Recommendation J.83	In force	-	here	here
J Suppl. 2 (11/1998)	Guidelines for the implementation of annex A of Recommendation J.112, "Transmission systems for interactive cable television services" – Example of digital video broadcasting (DVB) interaction channel for cable television distribution	In force	-	here	here
J Suppl. 3 (11/1998)	Guidelines for the implementation of Recommendation J.111 "Network independent protocols" – Example of digital video broadcasting (DVB) systems for interactive services	In force	-	here	here
J Suppl. 5 (09/1999)	Guidelines on the use of some ITU-T Recommendations in the J series	In force	here	here	here
J Suppl. 6 (09/2016)	Ultra high definition television cable transmission with functions defined in Recommendations ITU-T J.183, ITU-T J.288 and ITU-T J.94	In force	here	here	here
J Suppl. 7 (04/2021)	Embedded common interface (ECI) for exchangeable CA/DRM solutions; Guidelines for the implementation of ECI	In force	here	here	here
J Suppl. 8 (04/2021)	Embedded common interface (ECI) for exchangeable CA/DRM solutions; Trust environment	In force	here	here	here
J Suppl. 9 (04/2020)	Embedded common interface for exchangeable CA/DRM solutions; System validation	In force	here	here	here
J Suppl. 10 (09/2024)	Correspondence between CableLabs DOCSIS Specifications and ITU-T J-series Recommendations	In force	here	here	here
J Suppl. 11 (10/2025)	Guidelines for installing a digital television service for cable networks based on ITU-T Recommendations	In force	here	here	here
J Suppl. 14 (01/2025)	Use cases of microservices architecture for audiovisual media in the converged media cloud	In force	here	here	here

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ITU-T Recommendations

ITU-T J.225 (10/2022)