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Theory of Operation
4.5
Interface
The terrestrial interface functions include:
•
•
•
•
The interface block diagram is shown in Figure 4-4.
The terrestrial interfaces for the modem are defined by data communication standards
MIL-STD-188/EIA-449, EIA-232, or V.35. The interface receivers and drivers for these
standards, as well as the handshake signals for MIL-STD-188 and V.35, are selectable
through the front panel selection.
Overhead can be added to the terrestrial data for IBS and IDR modes of operation. The
format of the overhead data is dependent on the mode of operation and requires one of
the following options used with the interface PCB:
•
•
Refer to
4–12
MUX various types of ESC into the data
Buffering the receive data
DEMUX various types of ESC from the data
Monitoring and displaying the interface status without interruption of service
D&I MUX
ASYNC/AUPC
Appendix A
for additional information concerning these options.
SDM-300A Satellite Modem
Rev. 4
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