Cable Layout - Synchronous Ports (X.21)
DB-26 PIN
Signal Name
X.21
DB-15 PIN
1
Frame GND
1
2
Transmit +
2
19
Control +
3
3
Receive +
4
13
Indication +
5
17
Timing +
6
7
Signal GND
8
14
Transmit -
9
4
Control -
10
16
Receive -
11
5
Indication -
12
9
Timing -
13
Table A.2 - PXS X.21 Cable