Description - Comtech EF Data SDM-650B Installation And Operation Manual

SDM-650B Satellite Modem
The modem contains:
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The modem provides high performance with:
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1.2 Description

The modem is a complete, self-contained unit in a standard 19" rack-mountable enclosure
weighing approximately 25 lbs.
The modem is of modular construction (Figure 1-3).
The chassis assembly (with the front and rear panel) encloses several Printed Circuit Boards
(PCBs). The backplane PCB is mounted on the chassis assembly, and contains receptacles
for five plug-in PCBs.
Rev. 5
Built-in scrambler/descrambler
Differential encoder/decoder
Transmit and receive frequency synthesizers
Multi-rate Forward Error Correction (FEC) convolutional encoder-sequential
decoder (Viterbi K=7 is optional)
Narrow occupied bandwidth
Automatic signal acquisition
High flexibility
Extensive online monitoring circuits
Introduction
1–3