J4 Control Connector - Modem 'B' (Bottom), Db-9F; Table 5-3. J4 - Modem 'B' Control Connector Pin Assignments - Comtech EF Data CRS-170A Installation And Operation Manual

CRS-170A L-Band 1:1 Redundancy Switch
Connector Pinouts
5.4 J4 Control Connector – Modem 'B' (Bottom), DB-9F

Table 5-3. J4 - Modem 'B' Control Connector Pin Assignments

Pin #
1
2
3
4
5
6
7
8
9
Note the following:
•
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.
The Modem 'B' Control connector is a 9‐pin Type 'D' female interface located
on the modem side of the CRS‐170A L‐Band 1:1 Redundancy Switch module.
Refer to Table 5‐3 for pin assignments.
Signal Function
Signal Ground
Modem A Tx Comm
Modem A Clk Out
Modem B Online
Signal Ground
Modem B Tx Comm
Modem B Clk In
Modem B Serial Faults
+12 VDC
Signal Name
Ground
AUX_SER_TX_A
CLK_OUT_A
ONLINE_B
Ground
AUX_SER_TX_B
CLK_IN_B
SERIAL_FAULT_B
+12VDC
5–4
Revision 9
MN/CRS170A.IOM
Direction
-
Out
Out
Out
-
In
In
In
In