Modem A Control Connector - Comtech EF Data CRS-180 Manual

SUMMARY OF SPECIFICATIONS
CRS-180 IF 1:1 Redundancy Switch
4.1.1 M
ODEM
The Modem A Control connector is a 9-pin D female interface located on the
modem side of the IF Switch Module. Refer to
2, 3, and 4 carry signals looped through the switch module from Modem B to
Modem A, while pins 6, 7, and 8 loop the same signals from Modem A through to
Modem B. The 12VDC input, which is diode OR'ed with the corresponding
12VDC input from modem B, powers the switch module.
Table 2. J3A - Modem A Control Connector Pin Assignments
A C C
ONTROL ONNECTOR
Pin # Signal Function
1 Signal Ground
2 Modem B Serial Tx
3 Modem B Online Indication
4 Modem B Fault Indication
5 Signal Ground
6 Modem A Serial Tx
7 Modem A Online Indication
8 Modem A Fault Indication
9 +12 VDC
Table 2
Signal Name Direction
Ground
AUX_SER_TX_B
ONLINE_OUT_B
/FAIL_OUT_B
Ground
AUX_SER_TX_A
ONLINE_OUT_A
/FAIL_OUT_A
+12VDC
4–12
MN/CRS180.IOM
Revision 0
for pin assignments. Pins
-
Out
Out
Out
-
In
In
In
In