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2 theory of operation – Comtech EF Data SDM-9000 User Manual

Page 130

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Theory of Operation

SDM-9000 Satellite Modem

5–2

Rev. 4

z

RS-232-C

RS-485

Figure 5-1. Display/M&C Block Diagram

5.1.2 Theory of Operation

The M&C card is composed of the following subsections:

Microcontroller

Digital-to-Analog Converter (DAC)

Read Only Memory (ROM)

Analog-to-Digital Converter (ADC)

RAM

Inter-modem communications

Front panel user interface

Remote communications (RS-232/RS-485) user interface