Theory Of Operation; Figure 4-1. M&C Block Diagram - Comtech EF Data SDM-300A Installation And Operation Manual

Theory of Operation

4.1.1 Theory of Operation
The M&C card is composed of the following subsections:
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M O D EM
11 M Hz
CLO CK
DAC
ADC
4–2
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
M ICRO -
CO N TRO LLER
2
I C BUS
EIA-232
O R
EIA-485
Figure 4-1. M&C Block Diagram
SDM-300A Satellite Modem
FAULT
AND ALA R M
RELAYS
RO M
(M &C,
BULK,
BO O T)
RAM AND
REAL
TIM E
CLO CK
9-PIN
REM O TE
Rev. 4