Tech Stuff - ITU-T Multi-Media

Multi-Media Standards Summary Table

A simple standard made easier by having the right set of standards (oh really!!). And remember you have to buy every one them at $$$ a pop (none of this free IETF stuff here). And this does not include ASN.1 PER. I wonder why SIP especially is becoming very popular!! (the standards listed are given names here). The ITU - bless their hearts - do allow some free document downloads. Check their site for the latest mega offers.

Media	Narrow Band (H.320)	Low Bitrate (H.324)	ISO-Ethernet (H.322)	Ethernet (H.323)	ATM (H.321)	High Res ATM (H.310)
Video	H.261	H.261 H.263	H.261	H.261 H.263	H.261	MPEG-2 H.261
Audio	G.711 G.722 G.728	G.723	G.711 G.722 G.723 G.728	G.711 G.722 G.723 G.728 G.729	G.711 G.722 G.728	MPEG-1 MPEG-2
Data	T.120	T.120 T.434 T.84 Others	T.120	T.120	T.120 H.281 (H.224)	T.120
Multiplex	H.221	H.223	H.221	H.221	H.221	H.222.1 H.221
Signaling	H.230 H.242	H.245	H.230 H.242	H.230 H.225.0 H.245	H.230 H.242	H.245
Multi-point	H.243	NA	H.243	NA	H.243	NA
Encryption	H.233 H.234	H.233/324 H.234	H.320	TBD	H.233 H.234	NA

Multi-Media Standards

The various standards are now given meaningful titles (!!)

Standard	Coverage/Content
G.711	Audio encoding at 64K bit/s (mu-law and A-law) uncompressed. (samples sizes and rates)
G.722	Audio CODEC. 7 KHz sample at 64K bit/s (hifi voice)
G.723.1	Audio CODEC. Dual Rate Speed at 6.4 and 5.3K bit/s. (samples sizes and rates)
G.728	Audio CODEC. 16K bit/s speech
G.729 (A & B)	Audio CODEC. 8K bit/s speech (Conjugate structure- algebraic code excited linear prediction or CS-ACELP to its friends) (samples sizes and rates)
H.221	Frame structure for 64 to 1920K bit/s channel in udiovisual services
H.221.1	Multiplexing and synchronisation of multi-mdeia information for audiovisual communications in ATM environment.
H.223	Multiplexing Protocols for Low Bitrate Multimedia standards
H.225.0	Media Stream Packetization and synchronization on non-guaranteed Quality of Service LANs (Call control and RTP/RTCP)
H.230	Frame-synchronous Control and Indication signals for Audiovisual systems
H.231	Multi-point Control Unit for Audiovisual systems using Digitral Channels up to 2M bit/s
H.242	System for establishing communication between three or more audiovisual terminals using digital channels up to 2M bit/s
H.245	Control Protocol for Multimedia Communication (Terminal property exchange)
H.261	Video encoding
H.263	Video encoding (enhanced H.261)
H.320	Framework for transmitting audio and video over circuit switched digital networks (primarily ISDN)
H.321	Visual Telephone Terminals over ATM
H.322	Visual Telephone Terminals over Guaranteed QoS LANs
H.323	Visual Telephone Terminals over Non-Guaranteed QoS LANs
H.324	Audio and Video over POTS at less than 20K bit/s
T.120	Introduction to the audiographics and audiovisual conferencing recommendations
T.121	Generic Application Template
T.122	Multi-point communication service for audiographics and audiovisual conferencing service definition
T.123	Protocol stack for audiographics and audiovisual teleconference applications
T.124	Generic Conference Protocol
T.125	Multipoint communication service protocol specification
T.126	Still image protocol specification
T.127	Multi-point binary file transfer protocol
T.128	Audiovisual control for Multipoint Multimedia Systems

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