| Second-generation transmission systems for interactive cable television services – IP cable modems |
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This Recommendation is in the family of ITU-T Rec. J.112. Its purpose is to provide a technology through which the demand for symmetrical services on cable networks can be met. This second-generation technology, while using the same RF channel, is backward compatible with that of ITU-T Rec. J.112. It provides a significant increase in upstream channel capacity with wider channels, higher symbol rate and increased spectral efficiency. It provides for both Synchronous-CDMA and Advanced-TDMA coding and also adds higher order modulation capabilities. It is more robust with regard to noise immunity and provides greater multipath protection than the technology used in ITU-T Rec. J.112. |
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| Citation: |
https://handle.itu.int/11.1002/1000/6133 |
| Series title: |
J series: Cable networks and transmission of television, sound programme and other multimedia signals
J.110-J.129: Interactive systems for digital television distribution (DOCSIS first and second generations) |
| Approval date: |
2002-12-07 |
| Provisional name: | J.rfi2gen |
| Approval process: | AAP |
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Status: |
Superseded |
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Maintenance responsibility: |
ITU-T Study Group 21 |
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Further details: |
Patent statement(s)
Development history
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ITU-T Supplement
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Title
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Status
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Summary
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Table of contents
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Download
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J Suppl. 1 (11/1998)
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Example of linking options between annexes of ITU-T Recommendation J.112 and annexes of ITU-T Recommendation J.83
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In force
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-
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here
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here
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J Suppl. 2 (11/1998)
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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
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In force
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-
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here
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here
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J Suppl. 3 (11/1998)
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Guidelines for the implementation of Recommendation J.111 "Network independent protocols" – Example of digital video broadcasting (DVB) systems for interactive services
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In force
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-
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here
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here
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J Suppl. 5 (09/1999)
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Guidelines on the use of some ITU-T Recommendations in the J series
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In force
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here
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here
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here
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J Suppl. 6 (09/2016)
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Ultra high definition television cable transmission with functions defined in Recommendations ITU-T J.183, ITU-T J.288 and ITU-T J.94
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In force
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here
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here
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here
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J Suppl. 7 (04/2021)
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Embedded common interface (ECI) for exchangeable CA/DRM solutions; Guidelines for the implementation of ECI
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In force
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here
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here
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here
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J Suppl. 8 (04/2021)
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Embedded common interface (ECI) for exchangeable CA/DRM solutions; Trust environment
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In force
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here
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here
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here
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J Suppl. 9 (04/2020)
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Embedded common interface for exchangeable CA/DRM solutions; System validation
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In force
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here
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here
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here
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J Suppl. 10 (09/2024)
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Correspondence between CableLabs DOCSIS Specifications and ITU-T J-series Recommendations
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In force
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here
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here
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here
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J Suppl. 11 (10/2025)
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Guidelines for installing a digital television service for cable networks based on ITU-T Recommendations
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In force
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here
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here
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here
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J Suppl. 14 (01/2025)
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Use cases of microservices architecture for audiovisual media in the converged media cloud
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In force
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here
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here
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here
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| Title |
Approved on |
Download |
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Implementers' Guide for Recommendation ITU-T J.122
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2004-02-01
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here
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