H.2xx-серии|
H.300-399
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Поясняющая информация о
состоянии серии.This recommendation covers the technical requirements for the systems and terminals of broadband audiovisual communication services defined in H.200-Series recommendations. Both H.310 uni-directional and bi-directional broadband audiovisual terminals are defined. The classification of H.310 terminals into different terminal types is based on a set of audiovisual, network adaptation, and signalling capabilities. With these capabilities, H.310 terminals support a wide range of conversational and distributive applications and services.
| Version | Approved | Reference | Source/Notes |
|---|---|---|---|
| New | Nov 96 | Circ 208/235/8 | COM 15-242 |
| Correction 1 | Feb 98 | Circ 73/ - /101 | COM 16-55 |
| Revision 1 | Sept 98 | Circ 115/ - /141 | COM 16-68 |
This recommendation specifies technical requirements for narrow-band visual telephone systems and terminal equipment, typically for videoconferencing and videophone services. It describes a generic system configuration consisting of a number of elements which are specified by respective recommendations, definition of communication modes and terminal types, call control arrangements, terminal aspects and interworking requirements. This revision reflects the progress in relevant H-series recommendations such as H.233, H.234, H.242, H.243, H.244, etc.
| Version | Approved | Reference | Source/Notes |
|---|---|---|---|
| New | Mar 90 | COM XV-R37 | |
| Revision 1 | Mar 93 | COM XV-R96 | |
| Revision 2 | Mar 96 | Circ 169/196/211 | COM 15-151 |
| Revision 3 | Jul 97 | Circ 16/33/59 | COM 16-8 |
This recommendation describes technical specifications for adapting narrow-band visual telephone terminals, as defined in H.320, to broadband ISDN environments. It is based on AAL1 over Constant Bit Rate connections. The terminal conforming to this recommendation interworks with other terminals of the same type (i.e. other H.321 terminals) accommodated in B-ISDN as well as H.320 terminals accommodated in N-ISDN.
| Version | Approved | Reference | Source/Notes |
|---|---|---|---|
| New | Mar 96 | Circ 169/196/211 | COM 15-157 |
| Revision 1 | Feb 98 | Circ 73/ - /101 | COM 16-39 |
This recommendation covers the technical requirements for narrow-band visual telephone services defined in H.200-series recommendations, in those situations where the transmission path includes one or more Local Area Networks (LAN), each of which is configured and managed to provide a guaranteed quality of service (QoS) equivalent to that of the N-ISDN such that no additional protection or recovery mechanisms beyond those mandated by H.320 need be provided in the terminals. (H.323 addresses the use of LANs which are unable to provide the underlying performance assumed by this recommendation.)
| Version | Approved | Reference | Source/Notes |
|---|---|---|---|
| New | Mar 96 | Circ 169/196/211 | COM 15-158 |
This recommendation describes terminals and other entities that provide multimedia communications services over packet based networks (PBN) which may not provide a guaranteed Quality of Service. H.323 entities may provide real-time audio, video and/or data communications. Support for audio is mandatory, while data and video are optional, but if supported, the ability to use a specified common mode of operation is required, so that all terminals supporting that media type can interwork.
The packet based network over which H.323 entities communicate may be a point-to-point connection, a single network segment, or an inter-network having multiple segments with complex topologies.
H.323 entities may be used in point-to-point, multipoint, or broadcast (as described in H.332) configurations. They may interwork with H.310 terminals on B-ISDN, H.320 terminals on N-ISDN, H.321 terminals on B-ISDN, H.322 terminals on Guaranteed Quality of Service LANs, H.324 terminals on GSTN and wireless networks, V.70 terminals on GSTN, and voice terminals on GSTN or ISDN through the use of Gateways.
H.323 entities may be integrated into personal computers or implemented in stand-alone devices such as videotelephones.
Products claiming compliance with Version 1 of H.323 shall comply with all of
the mandatory requirements of H.323 (1996) which references H.225.0 (1996) and
H.245 (1996). Version 1 products can be identified by H.225.0 messages
containing a protocol identifier of:
and H.245 messages containing a protocol identifier of:
Products claiming compliance with Version 2 of H.323 shall comply with all of
the mandatory requirements of this document, H.323 (1998), which references
H.225.0 (1998) and H.245 (1998). Version 2 products can be identified by H.225.0
messages containing a protocol identifier of:
and H.245 messages containing a protocol identifer of:
| Version | Approved | Reference | Source/Notes |
|---|---|---|---|
| New | Nov 96 | Circ 208/235/8 | COM 15-245 |
| Revision 1 | Feb 98 | Circ 73/ - /101 | COM 16-54 |
| Revision 2 Annex D | Sep 98 | Circ 115/ - /141 | COM 16-60 |
This recommendation describes terminals for low bit rate multimedia communication, utilizing V.34 modems operating after the GSTN. H.324 terminals may carry real-time voice, data, and video, or any combination, including videotelephony.
H.324 terminals may be integrated into personal computers or implemented in stand-alone devices such as videotelephones. Support for each media type (voice, data, video) is optional, but if supported, the ability to use a specified common mode of operation is required, so that all terminals supporting that media type can interwork. H.324 allows more than one channel of each type to be in use. Other recommendations in the H.324-series include the H.223 multiplex, H.245 control, H.263 video codec, and G.723 audio codec.
This recommedation makes use of the logical channel signalling procedures of H.245, in which the content of each logical channel is described when the channel is opened. Procedures are provided for expression of receiver and transmitter capabilities, so transmissions are limited to what receivers can decode, and so that receivers may request a particular desired mode from transmitters. Since the procedures of H.245 are also planned for use by H.310 for ATM networks, and H.323 for non-guaranteed bandwidth LANs, interworking with these systems should be straightforward.
H.324 terminals may be used in multipoint configurations through MCUs, and may interwork with H.320 terminals on the ISDN, as well as with terminals on wireless networks.
| Version | Approved | Reference | Source/Notes |
|---|---|---|---|
| New | Mar 96 | Circ 169/196/211 | COM 15-162 |
| Revision 1 | Feb 98 | Circ 73/ - /101 | COM 16-37 |
| Revision 2 Annex F | (Sept 98) | Circ 115/ | COM16-61 |
This recommendation describes terminals, equipment, and services for multimedia communication over packet-based networks. H.332 terminals and equipment may carry real-time voice, data, and video in any combination. The goal is to work within the framework of H.323, yet provide scalability well beyond the limits of H.323 to enable applications involving hundreds and thousands of participants.
H.332 terminals may be integrated into personal computers or implemented in stand-alone devices such as videotelephones. Support for voice is mandatory, while data and video are optional, but if supported, the ability to use a specified common mode of operation is required, so that all terminals supporting that media type can interwork. Like H.323, H.332 allows more than one channel of each type to be in use.
H.332 terminals are based on H.323, therefore, they interwork via gateways with H.310 terminals on B-ISDN, H.320 terminals on N-ISDN, H.321 terminals on B-ISDN, H.322 terminals on Guaranteed Quality of Service LANs, H.324 terminals on GSTN and wireless networks, and V.70 terminals on GSTN.
| Version | Approved | Reference | Source/Notes |
|---|---|---|---|
| New | (Sept 98) | Circ 115/ | COM 16-41 |
End of H-series
Click here for full list of H-series recommendations.
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