Use the E4G-200's clock module for connecting a timing cable.
The clock module provides the following types of cable connections for connecting a Building Integrated Timing Supply (BITS) or a GPS timing source:
To connect to the mini-BNC connectors, use a 50-ohm coaxial cable with a mini-BNC connector at one end and a standard BNC connector at the other end.
To connect to the RJ-45 connector, use a twisted-pair cable with the pinouts listed in E4G-200 Clock Module RJ-45 Connector.