Hub
This chunk of hardware is used to network computers together (usually over an Ethernet connection). It serves as a common wiring point so that information can flow through one central location to any other computer on the network.
H.222.0
Generic coding of moving pictures and associated audio information.
H.223
Multiplexing protocol for low bit rate multimedia communication.
H.224
A real time control protocol for simplex applications using the H.221 LSD/HSD/MLP channels.
H.225
Call signalling protocols and media stream packetization for packet based multimedia communication systems.
H.230
Frame-synchronous control and indication signals for audiovisual systems.
H.233
Confidentiality system for audiovisual services.
H.234
Encryption key management and authentication system for audiovisual services.
H.235
Security and encryption for H-Series (H.323 and other H.245 based) multimedia terminals.
H.242
System for establishing communication between audiovisual terminals using digital channels up to 2 Mbit/s.
H.245
Control protocol for multimedia communication.
H.246
Interworking of H-Series multimedia terminals with H-Series multimedia terminals and voice/voiceband terminals on GSTN and ISDN.
H.248
Gateway Control Protocol.
H.261
Video codec for audiovisual services at p * 64 kbit/s.
H.263
Video coding for low bit rate communication.
H.281
A far end camera control protocol for video conferences using H.224.
H.282
Remote Device Control Protocol for Multimedia Applications.
H.283
Remote Device Control Logical Channel Transport.
H.310
ITU-T ‘umbrella’ recommendation that covers the technical requirements for broadband audiovisual communication systems and terminals.
H.320
ITU-T ‘umbrella’ recommendation that covers the technical requirements for narrow-band visual telephone services where channel rates do not exceed 1920 kbit/s. Typically used over ISDN public telephone networks.
H.321
ITU-T ‘umbrella’ recommendation that covers the technical requirements for adaptation of H.320 visual telephone terminals to B-ISDN environments.
H.322
ITU-T ‘umbrella’ recommendation that covers the technical requirements for Visual telephone systems and terminal equipment for local area networks which provide a guaranteed quality of service.
H.323
ITU-T ‘umbrella’ recommendation that covers the technical requirements for packet-based multimedia communications systems. Typically used over IP networks.
H.324
ITU-T ‘umbrella’ recommendation that covers the technical requirements for terminals for low bit rate multimedia communication. Typically used over POTS networks.
H.332
H.323 extended for loosely coupled conferences.
H.450.1
Generic functional protocol for the support of supplementary services in H.323.
H.450.2
Call transfer supplementary service for H.323.
H.450.3
Call diversion supplementary service for H.323.
H.450.4
Call hold supplementary service for H.323.
H.450.5
Call park and call pickup supplementary services for H.323.
H.450.6
Call waiting supplementary service for H.323.
H.450.7
Message waiting indication supplementary service for H.323.
H.450.8
Name identification supplementary service For H.323.
H.xxx
ITU H series recommendations - Audiovisual and multimedia systems.
HDLC
High level Data Link Control.
HDSL
High data rate Digital Subscribe Line: Modems using one or more twisted pair wires to deliver T1 or E1 rates.
Hot link
Link on a web site that takes you straight to another web site at the click of your mouse button.
HSCSD
High-Speed Circuit Switched Data. Technology that increases the data bandwidth over a GSM network by simultaneously using four time slots. Symmetric data rates of up to 28.8 kbits/s can be achieved.
HTML
HyperText Markup Language.
HTTP
HyperText Transfer Protocol.
Huffman encoding
Loss-less compression method using statistics to convert data into variable length bit strings. Also known as entropy encoding.
