Polycom MGC-50/MGC-100 installation manual Control Bus, Rear

Chapter 4 - Hardware Description

In the MGC-50, the front of the Backplane contains eight slots for Functional Modules and an additional slot (Slot A) for the Main Control Module. The back of the Backplane also contains eight slots for I/O cards and one “dummy” slot. The Network Interface Module is connected via the Backplane to I/O cards, which connect the system to the network. The Power Supply Module provides power to the Backplane via a power bus.

						Backplane
				H.323 I/O		MPI Serial Network I/F
Rear						H.323 Network I/F
		ATM I/O
						ATM Network I/F
	NET I/O
						ISDN Network I/F
						MUX
MUSIC I/O
					Video	Audio
			Data

Main Control

Module

Front

Power Supply

Module

Figure 4-12: MGC-50 Backplane

Control Bus

The MGC-100 and the MGC-50 use the same Control Bus. The Control Bus connects the Main Control Module to the Functional Modules. The Control Bus is an HDLC bus. A double bus is implemented for redundancy.

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