Comtech EF Data SDM-300A - Manual (Page 41)

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Chapter 2. Functional Description
2.1 Description of Monitor and Control (M&C)
The M&C monitors the modem and provides configuration updates to other modems within the
modem when necessary.The modem configuration parameters are maintained in battery-backed
RAM, which provides total recovery after power-down situation.The M&C functions include
extensive fault and status reporting.All modem functions are accessible through a local front
panel interface and a remote communications interface.
A block diagram of the M&C is shown in Figure 2-1.
2.1.1 Theory of Operation
The M&C card is composed of the following subsections:
• Microcontroller with Universal Asynchronous Receiver/Transmitter (UART)
• Digital-to-Analog Converter (DAC)
• Read Only Memory (ROM)
• Analog-to-Digital Converter (ADC)
• Read Access Memory (RAM)
• Universal ASYNC
• User Interface
• Fault and Alarm Relays