Comtech EF Data SMS-758 - Manual (Page 91)

SMS-758 Modem Protection Switch Theory of Operation
MN/SMS758 Rev. 3 4–31
4.6.5.1 Specification
Circuits Supported SD, RD, EXC, TXD, TXC, TXO, RXD, RXC, RXO, BWO 1-4, BWI
1-4, A1I, A1O, A2I, A2O, AND DEMOD FAULT.
Switching Format All signals switched with dry contacts.
Contact Arrangement Modulator signals: 16 poles.
Demodulator signals: 26 poles.
Ref. Clock: 2 poles.
Spares: 2 poles.
Demodulator signals: 26 poles.
Ref. Clock: 2 poles.
Spares: 2 poles.
4.6.5.2 Connector Pinouts
The IDR interface uses a 50-pin female D connector.
Screw locks provide mechanical security of the mating connector.
Signal Function Name Pin #
Ground - 1, 2
Send Data SD-A
SD-B 34
18
Receive Data RD-A
RD-B 36
20
Reference Clock EXC-A
EXC-B 35
19
8 KBPS 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 KBPS 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