J3 | Control A' Connector (Top) - Modem 'A' (Db-9F); J4 | Control B' Connector (Bottom) - Modem 'B' (Db-9F); Table 3-2. 'J3 | Control A' Modem Connector Pinouts; Table 3-3. 'J4 | Control B' Modem Connector Pinouts - Comtech EF Data CRS-180 Installation And Operation Manual

CRS-180 70/140 MHz IF 1:1 Redundancy Switch
Switch Connectors and Pinouts
3.2.1.2 'J3 | Control A' Connector (Top) – Modem 'A' (DB-9F)
Pin
9
8
7
6
3.2.1.3 'J4 | Control B' Connector (Bottom) – Modem 'B' (DB-9F)
Pin
9
8
7
6
The Modem 'A' Control connector is a 9-pin Type 'D' female interface. Pins 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 3-2. 'J3 | Control A' Modem Connector Pinouts

Signal Name
5 Ground
+12VDC
4 ONLINE_OUT_B
/FAIL_OUT_A
3 ONLINE_OUT_B
ONLINE_OUT_A
2 AUX_SER_TX_B
AUX_SER_TX_A
1 Ground
The Modem 'B' Control connector is a 9-pin Type 'D' female interface. 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 3-3. 'J4 | Control B' Modem Connector Pinouts

Signal Name
5 Ground
+12VDC
4 /FAIL_OUT_A
/FAIL_OUT_B
3 ONLINE_OUT_A
ONLINE_OUT_B
2 AUX_SER_TX_A
AUX_SER_TX_B
1 Ground
Signal Function
Signal Ground
+12 VDC
Modem 'B' Online Indication
Modem 'A' Fault Indication
Modem 'B' Online Indication
Modem 'A' Online Indication
Modem 'B' Serial Tx
Modem 'A' Serial Tx
Signal Ground
Signal Function
Signal Ground
+12 VDC
Modem 'A' Fault Indication
Modem 'B' Fault Indication
Modem 'A' Online Indication
Modem 'B' Online Indication
Modem 'A' Serial Tx
Modem 'B' Serial Tx
Signal Ground
3–5
MN/CRS180.IOM
Revision 11
Direction
-
In
Out
In
Out
In
Out
In
-
Direction
-
In
Out
In
Out
In
Out
In
-