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X.21 Cross-Connect Cable Specifications

To retain FCC Class A qualification all cables must be fully shielded and the shielding must be connected to the metal connectors.

SG2P X.21 Cable

Description
Pin Number
Description
 
Female DB15 '0'
Female DB15 '1'
 
TxData A
2
4
RxData A
RTS A
3
5
DCD A
RxData A
4
2

TxData A

DCD A
5
3
RTS A
Clock A
6
6

Clock A

GND
8
8

GND

TxData B
9
11

RxData B

RTS B
10
12
DCD B
RxData B
11
9

TxData B

DCD B
12
10
RTS B
Clock B
13
13
Clock B

Rx
=Receive, Tx=Transmit, CTS=Clear to Send, RTS=Ready to Send,
DTR=Data Terminal Ready, DSR=Data Set Ready, DCD=Data Carrier Detect