Polycom DOC2237A - Manual (Page 116)

Chapter 4 - Hardware Description
4-44
MPI Network Interface Module Architecture
Figure 4-25, “MPI-8 Network Interface module architecture” shows the
architecture for the MPI-8 Network Interface Module.
Figure 4-25: MPI-8 Network Interface module architecture
MUX Module
The MUX Module multiplexes and demultiplexes the audio, video, data, and
control information. Information arrives at the MUX Port in Nx56/64 Kbps
channels formatted according to the ITU-T H.221 standard for framing
(“Frame Structure for a 64 Kbps to 1920 Kbps Channel in Audiovisual
Teleservices”).
TDM Interface
TDM I/F
Card
Manager
Front
Panel
LEDs
Watch
Dog
HDLC Interface
Bit Rate I/F #1
Bit Rate I/F #2
PHYI/F
PHYI/F
H.323 video conferences do not require a MUX card. The H.323 card has a
build in MUX functionality.