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ITU-T H.230

Frame-synchronous control and indication signals for audiovisual systems

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Organization: ITU-T
Publication Date: 1 March 2009
Status: inactive
Page Count: 34
scope:

Digital audiovisual services are provided by a transmission system in which the relevant signals are multiplexed onto a digital path. In addition to the audio, video, user data and telematic information, these signals include information for the proper functioning of the system. The additional information has been named control and indication (C&I) to reflect the fact that while some bits are genuinely for "control", causing a state change somewhere else in the system, others provide for indications to the users as to the functioning of the system.

The C&I may be categorized into three groups:

a) call control - these are treated in the Q-series Recommendations;

b) transmission frame-synchronous, or otherwise requiring rapid response;

c) conference, data, and telematic control not requiring frame synchronism, governed by the multilayer protocol of Recommendations ITU-T T.122-T.125.

This Recommendation concerns only those C&I appearing in category b) which includes a simplified set of conference C&I for multipoint connections of simple terminals.

Document History

May 1, 2019
Frame-synchronous control and indication signals for audiovisual systems
Digital audiovisual services are provided by a transmission system in which the relevant signals are multiplexed onto a digital path. In addition to the audio, video, user data and telematic...
ITU-T H.230
March 1, 2009
Frame-synchronous control and indication signals for audiovisual systems
Digital audiovisual services are provided by a transmission system in which the relevant signals are multiplexed onto a digital path. In addition to the audio, video, user data and telematic...
October 1, 2005
Frame-synchronous control and indication signals for audiovisual systems Amendment 1: Support of Unicode in H.320 systems and new Annex A for H.230 generic capabilities and messages in H.245
A description is not available for this item.
March 1, 2004
Frame-synchronous control and indication signals for audiovisual systems SERIES H: AUDIOVISUAL AND MULTIMEDIA SYSTEMS Infrastructure of audiovisual services – Systems aspects
A description is not available for this item.
May 1, 1999
Frame-Synchronous Control and Indication Signals for Audiovisual Systems - Series H: Audiovisual and Multimedia Systems Infrastructure of Audiovisual Services - Systems Aspects
A description is not available for this item.
July 1, 1997
Frame-Synchronous Control and Indication Signals for Audiovisual Systems - Series H: Audiovisual and Multimedia Systems Infrastructure of Audiovisual Services - Systems Aspects
A description is not available for this item.
January 1, 1995
Frame-Synchronous Control and Indication Signals for Audiovisual Systems - Transmission of Non-Telephone Signals
A description is not available for this item.
January 1, 1993
Frame-Synchronous Control and Indication Signals for Audiovisual Systems (Study Group XV) 11 pp
A description is not available for this item.
January 1, 1990
Frame-Synchronous Control and Indication Signals for Audiovisual Systems
A description is not available for this item.

References

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