Polycom DOC2238A Network Router User Manual


 
Chapter 3 - System Architecture
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The MUX+ Module transfers the control information to the Main Control
Module via the Control Bus. The control information is then processed by the
Main Control Module and a control response forwarded via the Control Bus
to the appropriate MUX+ Ports.
The MUX+ module divides the incoming information into audio, video and
data components, and then forwards the information to the appropriate
functional module. The information arriving at the MUX+ ports is
multiplexed into Nx56/64 Kbps channels. These channels can be
hyperchannels or aggregated channels, depending on the capabilities of the
network and the receiving terminals.
The MUX+ Module transfers audio information to the Audio+ Module via the
Information Highway. The audio information is then processed by the
Audio+ Module and forwarded via the Information Highway to the
appropriate MUX+ ports.
The MUX+ Module transfers video information to the Video+ Module via the
Information Highway. There are two modes of video operation during a
conference:
Video Switching, where the speaker is the only person shown on the
screen. The MUX+ module broadcasts the video of the current speaker to
all sites involved in the conference.
Continuous Presence, where several participants are shown on the
screen. The video information is processed by the Video+ Module and
forwarded via the Information Highway to the appropriate MUX+ Ports.
The MUX+ Module transfers T.120 data (which follows the ITU-T T.120
standard for data transfer and application sharing in a multipoint conference)
to the Data Module via the Information Highway. The data information is
processed by the Data Module and forwarded to the appropriate MUX+ Ports.
After the audio, video, and data information has been processed, the
processed information flows back to the MUX+ module for multiplexing,
after which it is sent to the network via the Network Interface module and the
Input/Output card. This information is then transferred to the Network
Interface module via the Information Highway. The information is then ready
for transmission.