Comtech EF Data SDM-9000 - Manual (Page 129)

Rev.4 5–1
5
Chapter 5.
THEORY OF OPERATION
This chapter includes theory of operation for the various PCBs in the modem.
5.1 Display/M&C
5.1.1 Description
The display/Monitor & Control (M&C) PCB is located on the front panel. The M&C
monitors the modem and provides configuration updates to other modules within the
modem when necessary.
The modem configuration parameters are maintained in battery-backed Random Access
Memory (RAM), which provides total recovery after a power-down situation. The M&C
functions include extensive fault monitoring and status reporting. All modem functions
are accessible through a local front panel interface and a remote communications
interface.
Refer to Figure 3-1 for a drawing of the M&C card. A block diagram of the M&C is
shown in Figure 5-1.