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CRS-180 70/140 MHz IF 1:1 Redundancy Switch
Connector Pinouts
5.2
Modem Side: Type 'BNC' IF Connectors
There are four 50Ω Type 'BNC' female connectors located on the modem side of the
CRS-180. Refer to Table 5-1 for details.
Connector
5.3
J3 Control Connector (Top) – Modem 'A'
Table 5-2. J3 - Modem 'A' Control Connector Pin Assignments
Pin #
Table 5-1. Modem Side Type 'BNC' Connectors
Type 'N'
Ref Des
RX A
J1
RX B
J2
TX A
J5
TX B
J6
The Modem 'A' Control connector is a 9-pin Type 'D' female interface located on
the modem side of the CRS-180. Refer to Table 5-2 for pin assignments. 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.
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
Description
RX-IF signal
RX-IF signal
TX-IF signal
TX-IF signal
Signal Name
Ground
AUX_SER_TX_B
ONLINE_OUT_B
/FAIL_OUT_B
Ground
AUX_SER_TX_A
ONLINE_OUT_A
/FAIL_OUT_A
+12VDC
5–2
Revision 7
MN/CRS180.IOM
Direction
Out
Out
In
In
Direction
-
Out
Out
Out
-
In
In
In
In
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