Polycom DOC2238A - Manual (Page 78)

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.