Polycom DOC2238A - Manual (Page 88)

Chapter 4 - Hardware Description
4-8
Control Unit
The Main Control Unit performs the functions of conference setup,
conference termination, and resource allocation in both the MGC+100 and
the MGC+50. The Main Control Module has an Intel-based Pentium
processor, a hard disk drive and 256 MB of memory. The Control Unit is
located in slot A of the MGC+, and is the connected to the MCU’s backplane
and Control Module rear I/O panel.
The front LED’s indicate the status if the module is in operation and
functioning properly.
Figure 4-7 shows a block diagram of the Main Control Module.
Figure 4-6: Block diagram of MCM
Communications
Controller, C8M,
CCOM
Serial
Interface
LAN
Interface
Main
CPU
Hard
Disk
External Flash
Disk
CPU
BUS
The MGC+ unit can contain different types of functional network cards. The
Main Control Module operating system includes drivers for all of the cards. The
Main Control Module’s operating system automatically detects the card type. If
the card is correctly identified, the system starts up correctly. If the system fails
to detect any card type, it will start up according to the card type definition in the
system.cfg file.