3 overhead data a and b connectors, db-25m – Comtech EF Data CRS-150 User Manual
Page 38
CRS-150 1:1 Redundancy Switch
Revision 2
Connector Pinouts
MN/CRS150.IOM
3–12
3.3.2.3 Overhead Data A and B Connectors, DB-25M
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)
Pin #
Signal Function
Signal Name
Direction
14
IDR 64 kbps ESC TX Data +
TX-422DAT-B
Out
2
IDR 64 kbps ESC TX Data -
TX-422DAT-A
Out
12
IDR 64 kHz ESC TX Clock +
TX-422CLK-B
In
15
IDR 64 kHz ESC TX Clock -
TX-422CLK-A
In
11
IDR 1 kHz TX Octet Clock +
TX-OCT-B
In
24
IDR 1 kHz TX Octet Clock -
TX-OCT-A
In
16
IDR 64 kbps ESC RX Data +
RX-422DAT-B
In
3
IDR 64 kbps ESC RX Data -
RX-422DAT-A
In
9
IDR 64 kHz ESC RX Clock +
RX-422CLK-B
In
17
IDR 64 kHz ESC RX Clock -
RX-422CLK-A
In
19
IDR 1 kHz RX Octet Clock +
RX-OCT-B
In
4
IDR 1 kHz RX Octet Clock -
RX-OCT-A
In
20
Balanced Ext. Ref. Clock +
EXT-CLK-B
Out
23
Balanced Ext. Ref. Clock -
EXT-CLK-A
Out
13
IBS ESC RS232 TX Data
TX-232-DATA
Out
22
IBS ESC RS232 TX Clock
TX-232-CLK
In
8
IBS ESC RS232 RX Data
RX-232-DATA
In
10
IBS ESC RS232 RX Clock
RX-232-CLK
In
5
IBS TX High-Rate ESC Data
TX-ASYNC
Out
6
IBS RX High-Rate ESC Data
RX-ASYNC
In
1
IDR Back Alarm 1 H/W input
BW-IN1
Out
18
IDR Back Alarm 2 H/W input
BW-IN2
Out
21
IDR Back Alarm 3 H/W input
BW-IN3
Out
25
IDR Back Alarm 4 H/W input
BW-IN4
Out
7 Signal
Ground Ground
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