VCON Cruiser Manual de usuario descargar pdf (Pagina 3)

The video codec for the H.323 standard is H.263. This video codec ensures that video will not be

transmitted higher then determined via the capability exchange between endpoints (terminals).

Thus the video is sent at the rate of the slowest link in the chain. Finally, all data that is shared

between H.323 conference collaborators (whiteboard, shared and collaborative applications, file

transfer, etc.) meet the T.120 standard which uses the reliable, lossless method of transmission

discussed above. See the imamge above for a pictorial representation of H.323 codecs.

A breakdown of the multimedia component that fall within the H.323 protocol will next be

addressed.

Network Components:

The H.323 network in comprised of four major components: Terminals, Gateways, Gatekeepers,

and Multipoint Control Units. A brief definition of each will follow. For a more detailed

overview with supporting graphics please refer to the URL cited at the beginning of the report.

TERMINALS

Terminals are the client endpoints on the LAN that provide real-time, two-way

communications. All terminals must support voice communications; video and data are

optional.

GATEWAY:

The Gateway is an optional element in an H.323 conference. Gateways provide many services,

the most common being a translation function between H.323 conferencing endpoints and other

terminal types. Gateways are required if connections to other networks are needed. In addition,

the Gateway also translates between audio and video codecs and performs call setup and clearing

on both the LAN side and the switched-circuit network side. Basically, gateways allow different

types of networks (ISDN, LAN, PSTN, etc.) to communicate via multimedia conferencing

technologies.

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VCON Cruiser Manual de usuario Pagina 3