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SDM-300A Satellite Modem
A backward alarm being received on a particular link is detected by one of the two
following methods:
•
•
Refer to Appendix B for the remote interface specification.
In addition to the four backward alarms for IDR and two backward alarms (primary and
secondary) for IBS, all modes support the following faults:
•
•
•
Each fault is indicated by a FORM C relay contact and an open collector output.
Rev. 4
The backward alarm output drives a FORM C relay with all three contacts
available on the data connector.
The status of all transmit and receive backward alarms may be read through the
EIA-232 or EIA-485 remote interface connector that is integrating a modem or
switch into a computer network.
MOD (modulator equipment)
DEM (demodulator equipment)
CEQ (common equipment)
Theory of Operation
4–17
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