Four cables are available for the X.21/V.35 I/O modules:
Each 200-pin proprietary socket on the I/O module provides connections to 8 V.35 or X.21 ports. The remote end of the cable is terminated with either 8 X.21 connectors or 8 V.35 connectors. The cable you attach to the port on the I/O module determines whether the connection is X.21 or V.35 and DCE or DTE.
Figure 35: X.21/V.35 Module with 50-Pin X.21/V.35 Connector
