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Comtech EF Data SMS-451 User Manual

Page 38

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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).