3 connector pinout – Comtech EF Data SMS-458B User Manual
Page 73
SMS-458B Modem Protection Switch
Revision 2
Theory of Operation
MN/SMS458B.IOM
4–13
4.2.1.3 Connector
Pinout
The IDR interface uses a 50-pin female D connector. Screw locks and latching blocks
provide mechanical security of the mating connector.
Signal Function
Name
Pin #
Ground GND
1,
2
8 kbit/s TX Data
TXD-A
TXD-B
37
38
8 kHz TX Clock Out
TXC-A
TXC-B
21
22
1 kHz TX Octet In
TXO-A
TXO-B
4
5
8 kbit/s RX Data
RXD-A
RXD-B
39
40
8 kHz RX Clock Out
RXC-A
RXC-B
23
24
1 kHz RX Octet Out
RXO-A
RXO-B
6
7
Backward Alarm 1 Out
BWO1-C
BWO1-NC
BWO1-NO
8
25
41
Backward Alarm 2 Out
BWO2-C
BWO2-NC
BWO2-NO
9
26
42
Backward Alarm 3 Out
BWO3-C
BWO3-NC
BWO3-NO
10
27
43
Backward Alarm 4 Out
BWO4-C
BWO4-NC
BWO4-NO
11
28
44
Backward Alarm 1 In
BWI1
12
Backward Alarm 2 In
BWI2
13
Backward Alarm 3 In
BWI3
14
Backward Alarm 4 In
BWI4
15
ADPCM 1 Audio In
A1I-A
A1I-B
45
29
ADPCM 1 Audio Out
A1O-A
A1O-B
46
30
ADPCM 2 Audio In
A2I-A
A2I-B
47
31
ADPCM 2 Audio Out
A2O-A
A2O-B
48
32
Demod Fault Relay
DF-C
DF-NO
16
50
Modulator Fault
MF
49
Demodulator Fault
DF
33
Deferred Maintenance Alarm
DMA
17