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CDM-600L Satellite Modem
Connector Pinouts
5.2
Overhead Interface Connector (P3A)
The overhead interface connector is a 25-pin male D interface located on the rear panel of the
modem. Refer to Table 5-2 for pin assignments.
Pin #
14
2
12
15
11
24
16
3
9
17
19
4
20
23
13
22
8
10
5
6
1
18
21
25
7
Table 5-2. Overhead Interface Connector Pin Assignments
Signal Function
IDR 64 kbps ESC TX Data +
IDR 64 kbps ESC TX Data -
IDR 64 kHz ESC TX Clock +
IDR 64 kHz ESC TX Clock -
IDR 1 kHz TX Octet Clock +
IDR 1 kHz TX Octet Clock -
IDR 64 kbps ESC RX Data +
IDR 64 kbps ESC RX Data -
IDR 64 kHz ESC RX Clock +
IDR 64 kHz ESC RX Clock -
IDR 1 kHz RX Octet Clock +
IDR 1 kHz RX Octet Clock -
Balanced Ext. Ref. Clock +
Balanced Ext. Ref. Clock -
IBS ESC RS232 TX Data
IBS ESC RS232 TX Clock
IBS ESC RS232 RX Data
IBS ESC RS232 RX Clock
IBS TX High-Rate ESC Data
IBS RX High-Rate ESC Data
IDR Back Alarm 1 H/W input
IDR Back Alarm 2 H/W input
IDR Back Alarm 3 H/W input
IDR Back Alarm 4 H/W input
Signal Ground
Signal Name
TX-422DAT-B
TX-422DAT-A
TX-422CLK-B
TX-422CLK-A
TX-OCT-B
TX-OCT-A
RX-422DAT-B
RX-422DAT-A
RX-422CLK-B
RX-422CLK-A
RX-OCT-B
RX-OCT-A
EXT-CLK-B
EXT-CLK-A
TX-232-DATA
TX-232-CLK
RX-232-DATA
RX-232-CLK
TX-ASYNC
RX-ASYNC
BW-IN1
BW-IN2
BW-IN3
BW-IN4
Ground
5–3
Revision 2
MN/CDM600L.IOM
Direction
In
In
Out
Out
Out
Out
Out
Out
Out
Out
Out
Out
In
In
In
Out
Out
Out
In
Out
In
In
In
In
-
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