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SDM-9000 Satellite Modem
More complicated systems may be handled by connecting the appropriate outputs of the
receive fault relay to the appropriate backward alarm inputs. In a multidestination
system, the relay might only be connected to the particular backward alarm assigned to
that link. Refer to IESS-308 for further clarification.
There are two methods for detecting a backward alarm that is being received on a
particular link:
•
available on the data connector.
•
(or switch) RS-232-C or RS-485 remote interface connector, the status of all transmit and
receive backward alarms may be read through that port.
Refer to Appendix B for remote control operation information.
Rev.4
Each backward alarm output drives a Form C relay with all three contacts
If a modem (or switch) is integrated into a computer network through the modem
Theory of Operation
5–29
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