3 terrestrial data connections, 1 p3a overhead data connector, db-25m – Comtech EF Data CDM-600/600L User Manual
Page 64
CDM-600/600L Open Network Satellite Modem
Revision 3
Rear Panel Connector Pinouts
MN/CDM600L.IOM
3–4
3.3 Terrestrial Data Connections
3.3.1 P3A Overhead Data Connector, DB-25M
The 25-pin ‘D’ Type male (DB-25M) P3A Overhead data connector is
used for passing components of Intelsat specified overhead frame
structures. These include 64 kbps RS-422 and 1/16 IBS overhead ESC at
RS-232. The IDR backward alarm inputs are found on this connector.
P3A Overhead Interface Connector (DB-25M)
Pin #
Signal Function
Signal Name
Direction
14
IDR 64 kbps ESC TX Data +
TX-422DAT-B
In
2
IDR 64 kbps ESC TX Data -
TX-422DAT-A
In
12
IDR 64 kHz ESC TX Clock +
TX-422CLK-B
Out
15
IDR 64 kHz ESC TX Clock -
TX-422CLK-A
Out
11
IDR 1 kHz TX Octet Clock +
TX-OCT-B
Out
24
IDR 1 kHz TX Octet Clock -
TX-OCT-A
Out
16
IDR 64 kbps ESC RX Data +
RX-422DAT-B
Out
3
IDR 64 kbps ESC RX Data -
RX-422DAT-A
Out
9
IDR 64 kHz ESC RX Clock +
RX-422CLK-B
Out
17
IDR 64 kHz ESC RX Clock -
RX-422CLK-A
Out
19
IDR 1 kHz RX Octet Clock +
RX-OCT-B
Out
4
IDR 1 kHz RX Octet Clock -
RX-OCT-A
Out
20
Balanced Ext. Ref. Clock +
EXT-CLK-B
In
23
Balanced Ext. Ref. Clock -
EXT-CLK-A
In
13
IBS ESC RS232 TX Data
TX-232-DATA
In
22
IBS ESC RS232 TX Clock
TX-232-CLK
Out
8
IBS ESC RS232 RX Data
RX-232-DATA
Out
10
IBS ESC RS232 RX Clock
RX-232-CLK
Out
5
IBS TX High-Rate ESC Data
TX-ASYNC
In
6
IBS RX High-Rate ESC Data
RX-ASYNC
Out
1
IDR Back Alarm 1 H/W input
BW-IN1
In
18
IDR Back Alarm 2 H/W input
BW-IN2
In
21
IDR Back Alarm 3 H/W input
BW-IN3
In
25
IDR Back Alarm 4 H/W input
BW-IN4
In
7 Signal
Ground
Ground
--