G.703 ADAPTERS AND BALUN MATE II
3. Configuration
The G.703 Adapters and the Balun Mate II have only one user-settable configuration option. They express Transmit Data (TX) shield to the twisted-pair cabling on RJ-45 Pin 3 and Receive Data (RX) Shield on RJ-45
Pin 6. Pin 3 is always connected to the shield on the RJ-45 connector itself, but in the factory-default settings of the Adapters and the Balun Mate II, it’s also connected to the shield of the coaxial TX cable, and RJ-45 Pin 6 is connected to the shield on the coaxial RX cable.
This should be acceptable in most cases; if it is, proceed with Chapter 4. But sometimes it’s better for the twisted-pair and coaxial shields to be isolated from each other. For example, in order to avoid electrical “ground loop” problems, the two shields should be isolated on one of any pair of Adapters or modules connected back-to-back. So you might want to change this setting, which involves removing jumpers.
Both of the Adapter models have a pair of internal jumpers labeled JP1 and JP2, while the Balun Mate II has a pair of these jumpers mounted on each of its sixteen port-card modules. In their factory-default
