- Cabletron SmartSwitch Router Installation & Configuration Guide

Connectors, Adapters and Cable Connections
B-6
Cable Connections
Tables B-3 through B-8 list the proper cable connections for the X.21,
EIA422, V.35, EIA530A, EIA423, and V.24/EIA232 standards.
1
Contacts tied together.
2
120 OHM resistor, 1/2w between pins 6 and 31, 10 and 35, 17 and 42. The resistors are at
the P1 end of the cable.
Table B-3. X.21 Cable Connections (BC12F-06)
From Pin
Connector (P1)
To X.21 Pin
Connector (P2)
Signal Name
1, 2, 26 –
Code Ground
1
5 2 T(A) TX Data A
30 9 T(B) TX Data B
6 5 I(A) DCD A
31 12
I(B) DCD B
2
8 3 C(A) RTS A
33 10 C(B) RTS B
10 4 R(A) RX Data A
35 11
R(B) RX Data B
2
17
22
6
13
S(A) TX Clock A
S(B) TX Clock B
2
13, 15 - RX Clock A
DTE Clock B
1
38, 40 - RX Clock B
DTE Clock B
2
37 8 G DTE Ground