Cabletron Systems 520 - Manual (Page 86)

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