DTE X.21
Avaya X330WAN User’s Guide 225
DTE X.21Introduction
Figure A.2 shows the Avaya serial to X.21 cable and Table A.2 shows the pinouts.
The arrows indicate the signal direction – --> means DTE to DCE and <-- means
DCE to DTE.
Figure A.2 Avaya™ serial cable DTE X.21 Cable
Pinouts
Table A.2 X.21 DCE Serial Cable Pinouts
Serial
connector pin
Signal name Note Direction DB-15
connector
pin
Drain wire Shield GND P2-1
P1-1
P1-14
TXD+
TXD-
Twisted pair #5 -->
-->
P2-2
P2-9
P1-8
P1-9
RTS+
RTS-
Twisted pair #3 -->
-->
P2-3
P2-10
P1-5
P1-18
RXD+
RXD--
Twisted pair #8 <--
<--
P2-4
P2-11
P1-11
P1-10
CTS+
CTS-
Twisted pair #2 <--
<--
P2-5
P2-12
P1-4
P1-17
RXC+
RXC-
Twisted pair #7 <--
<--
P2-6
P2-13
Not connected P2-14
P2-15
P2-7
P1-22
P1-23
Not connected
8 15
1 9
P1 P2
Avaya™ serial cable DTE X.21
26 13
14 1
CB0314