Table of Contents
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Theory of Operation
Backward Alarm 3 In
Backward Alarm 4 In
ADPCM 1 Audio In
ADPCM 1 Audio Out
ADPCM 2 Audio In
ADPCM 2 Audio Out
Demod Fault Relay
Modulator Fault
Demodulator Fault
Deferred Maintenance Alarm
Note: MF and DF inputs are only on the prime and backup modem interface connectors,
not on the terrestrial data connector.
4–36
SMS-758 Modem Protection Switch
BWI3
14
BWI4
15
A1I-A
45
A1I-B
29
A1O-A
46
A1O-B
30
A2I-A
47
A2I-B
31
A2O-A
48
A2O-B
32
DF-C
16
DF-NO
50
MF
49
DF
33
DMA
17
MN/SMS758 Rev. 3
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Table of Contents
