Thursday, October 21, 2010

What is H.323 Protocol?

The H.323 is a family of standards as defined by ITU for multimedia communications over LAN networks. It is defined specifically for LAN technologies that do not guarantee quality of service (QoS). Examples include TCP / IP and IPX over Ethernet, Fast Ethernet or Token Ring. The most common networking technology in which they are deploying H.323 is IP (Internet Protocol).

This standard defines a rich set of features and functions. Some are required and others optional. The H.323 defines much more than the terminals. The standard defines the following most important component:

Terminal

GateWay

Gatekeeper

Multipoint Control Unit

The H.323 uses the same compression algorithms for video and audio to the H.320 standard, although it introduces some new ones. It is used for T.120 data collaboration.

The H.323 in historical perspective:

Prior to H.323, the ITU is focused exclusively on the standardization of global telecommunications networks. For example, in 1985 he began work in the specification that defines the image and voice transmission on circuit-switched networks such as ISDN. The ratification of the standard (H.320) took place 5 years later (was approved by the CCITT in December 1990). Only 3 years after equipment was available that met the standard and allow inter-operability between them.

In January 1996, a group of vendors of computer networks and proposed the creation of a new ITU-T standard to incorporate video conferencing on the LAN. Initially, research focused on local area networks, as these are easier to control. However, with the expansion of the Internet, the group had to consider all IP networks within a single recommendation, which marked the beginning of H.323.

The supports H.323 real time video, audio and data over local area networks, metropolitan, regional or large area. Likewise supports Internet and intranets. In May 1997, the Group 15 of ITU H.323 redefined as the recommendation for "multimedia communications systems in those situations in which the means of transport is a packet switching network that can provide quality service guaranteed.

Note that also supports H.323 videoconference on point to point connections, and ISDN telephone. In these cases, there must be a transport protocol such as PPP packet.

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