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SDM-300L3 Satellite Modem
Connector Pinouts
Notes:
1. IDR configuration connector pinouts:
a.
Backward alarm relay contacts are named for normal no fault conditions (BWOx-C
connected to BWOx-NC if no fault).
b.
Backward alarm inputs should be grounded or pulled logic low to clear the alarm.
c.
Signals MF, DF, and DMA are open-collector, high-impedance (if faulted). A
backup protection switch uses MF and DF if the modem is used in a redundant
system.
d.
Relay contacts DF-C and DF-NO are named for faulted condition (DF-C connected
to DF-NO, unless demodulator [Demod] fault).
2. D&I/ASYNC interface connector pinouts:
a.
With regard to alarm relay contacts, COMM is connected to NO when there is no
fault. COMM is connected to NC in a faulted condition.
b.
Signals MF, DF, and DMA are open-collector, high-impedance (if faulted). A
backup protection switch uses MF and DF if the modem is used in a redundant
system.
3. The breakout panel provides the external connections between the modem and the
terrestrial equipment when the modem has a 50-pin connection.
3–10
Revision 1
MN/SDM300L3.IOM
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