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

SUMMARY OF SPECIFICATIONS
CRS-180 IF 1:1 Redundancy Switch
4.1.2 M
ODEM
The Modem B Control connector is a 9-pin D female interface located on the
modem side of the L-Band Switch Module. Refer to Table 3 for pin assignments.
Pins 2, 3, and 4 carry signals looped through the switch module from Modem A to
Modem B, while pins 6, 7, and 8 loop the same signals from Modem B through to
Modem A. The 12VDC input, which is diode OR'ed with the corresponding
12VDC input from modem A, powers the switch module.
Table 3. J3B - Modem B Control Connector Pin Assignments
Pin #
1
2
3
4
5
6
7
8
9
B C C
ONTROL ONNECTOR
Signal Function
Signal Ground
Modem A Serial Tx
Modem A Online Indication
Modem A Fault Indication
Signal Ground
Modem B Serial Tx
Modem B Online Indication
Modem B Fault Indication
+12 VDC
Signal Name
Ground
AUX_SER_TX_A
ONLINE_OUT_A
/FAIL_OUT_A
Ground
AUX_SER_TX_B
ONLINE_OUT_B
/FAIL_OUT_B
+12VDC
4–13
MN/CRS180.IOM
Revision 0
Direction
-
Out
Out
Out
-
In
In
In
In