Comtech EF Data SNM-1002 - Manual (Page 98)

SNM-1002 LinkSync
 Modem
Revision 2
Theory of Operation MN/SNM1002.OM
4–4
4.2.1 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
MODEM
11 MHz
CLOCK
I C BUS 2 RAM AND
REAL
TIME
CLOCK
ROM
(M&C,
BULK,
BOOT)
FAULT
AND ALARM
RELAYS
MICRO-
CONTROLLER
DAC
ADC
EIA-232
OR
EIA-485
9-PIN
REMOTE
Figure 4-1. M&C Block Diagram