Comtech EF Data SMS-451 - Manual (Page 38)

SMS-451 Satellite Switch Revision 0
Installation MN/SMS451.IOM
2-12
Signal Function Name Pin #
BACKWARD ALARM 1 IN BWI1 12
(See Note 2)
BACKWARD ALARM 2 IN BWI2 13
(See Note 2)
BACKWARD ALARM 3 IN BWI3 14
(See Note 2)
BACKWARD ALARM 4 IN BWI4 15
(See Note 2)
MODULATOR FAULT (J2 and J4
only) MF 49
(See Note 3)
DEMODULATOR FAULT (J2 and
J4 only) DF 33
(See Note 3)
DEFERRED MAINTENANCE
ALARM DMA 17
(See Note 3)
DEMODULATOR FAULT RELAY DF-C
DF-NO 16
(See Note 4)
50
AGC OUT AGC-OUT 3
Notes:
1. BACKWARD ALARM relay contacts named for normal “No Fault”
condition (BWOx-C connected to BWOx-NC if no fault).
2. BACKWARD ALARM inputs must be grounded or pulled logic low to clear
alarm.
3. SIGNALS MF, DF, and DMA are open-collector high-impedance if faulted.
MF and DF are used by the switch for switching and are not present at J1.
4. RELAY CONTACTS DF-C and DF-NO named for faulted condition (DF-C
connected to DF-NO unless Demod Fault).