Comtech EF Data SDM-650B - Manual (Page 28)

Introduction SDM-650B Satellite Modem
1–4 Rev. 5
Figure 1-3. Modular Construction
Test points are located on the front board edge of the modulator, demodulator, and decoder
PCBs. Refer to Section 6.1.4 for listings and diagrams of the test points.
All controls and indicators for operation of the modem are located on the front panel. For
more information, refer to Chapter 4.
The chassis also contains the power supply; a fan is located on the rear panel.
The modem consists of the following assemblies:
Assembly Drawing #
Chassis with Power Supply AS/1099
PCB, M&C AS/0356
PCB, Modulator AS/0773-X
PCB, Demodulator AS/0778-X
PCB, Sequential Decoder AS/0365-X
PCB, Front Panel Control Board AS/0361
PCB, Mother Board AS/0979-1
PCB, Digital Interface V.35 AS/0627-2 (Optional)
PCB, Digital Interface DS1 AS/0569 (Optional)
PCB, Digital Interface MIL-STD-188-114 AS/0627-3 (Optional)
PCB, Doppler Buffer AS/3812 (Optional)
PCB, Asynchronous Overhead Channel Unit AS/1311-X (Optional)
Note: X = various options available on the modulator, demodulator, and decoder
boards.