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CRS-150 1:1 Redundancy Switch
Connector Pinouts
3.3.2.3
Overhead Data A and B Connectors, DB-25M
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
The 25-pin 'D' Type male (DB-25M) Overhead Data A and B connectors
are used for passing components of Intelsat specified overhead frame
structures. These include 64 kbps EIA-422 and 1/16 IBS overhead ESC at
EIA-232. The IDR backward alarm inputs are found on this connector.
Overhead Data A and B Connectors (DB-25M)
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
3–12
Signal Name
Direction
TX-422DAT-B
Out
TX-422DAT-A
Out
TX-422CLK-B
In
TX-422CLK-A
In
TX-OCT-B
In
TX-OCT-A
In
RX-422DAT-B
In
RX-422DAT-A
In
RX-422CLK-B
In
RX-422CLK-A
In
RX-OCT-B
In
RX-OCT-A
In
EXT-CLK-B
Out
EXT-CLK-A
Out
TX-232-DATA
Out
TX-232-CLK
In
RX-232-DATA
In
RX-232-CLK
In
TX-ASYNC
Out
RX-ASYNC
In
BW-IN1
Out
BW-IN2
Out
BW-IN3
Out
BW-IN4
Out
Ground
--
Revision 2
MN/CRS150.IOM
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