Comtech EF Data SMS-451 User 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).