CRS-170 1:1 Redundancy Switch
Revision 1
Installation and Operations Manual
MN/CRS170.IOM
28
4.1.1
M
ODEM
A C
ONTROL
C
ONNECTOR
The Modem A Control connector is a 9-pin D female interface located on the
modem side of the L-Band Switch Module. Refer to Table 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.
Table 2. J3A - Modem A Control Connector Pin Assignments
Pin #
Signal Function
Signal Name
Direction
1 Signal
Ground
Ground
-
2
Modem B 232 Tx
AUX_SER_TX_B
Out
3
Modem B Online Indication ONLINE_OUT_B
Out
4
Modem B Fault Indication
/FAIL_OUT_B
Out
5 Signal
Ground
Ground
-
6
Modem A 232 Tx
AUX_SER_TX_A
In
7
Modem A Online Indication ONLINE_OUT_A
In
8
Modem A Fault Indication
/FAIL_OUT_A
In
9 +12
VDC
+12VDC
In
Содержание CRS-170
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