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Chapter 4 - Hardware Description
4-58
Video Module (Standard)
The Video Module performs video processing and Transcoding. The module
supports the ITU-T H.261 and H.263 standards (“Video Codec for
Audiovisual Services at Px64 Kbps”).
The Video Module supports multiple sites. When using the Continuous
Presence mode of operation, the Video Module combines multiple video
sources to build a video layout image. Depending on the number of
conference participants and the quality of the screen, the MGC supports video
layout configurations of 2, 4, 9, 1+5 and others.
The Video Module performs Transcoding between different compressed
video bit rates to support multiple bit rates on the same conference. The
module performs Transcoding from QCIF to CIF resolution to support
multiple resolution rates in the same conference.
Video Module Architecture
Figure 4-29 shows the architecture for the Video Module.
Figure 4-31: Video Module
TDM Interface
Video
Video Hardware
Card
Manager
Watch
Dog
Memory
HDLC Interface
Front
Panel
LEDs
Memory
Video
CODEC
x6