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The coax interface for the ARCNET local area network uses a BNC connector. At both ends of the network segment, the coaxial cable must be terminated.
Figure 4-6 Onboard Coax Termination
The terminating resistor can be placed at the cable, using a T-connector with a BNC
terminator, or the onboard terminator on the CC121 can be used. Jumper JB6 is used to
select the cable termination on the CC121 module. When a jumper is installed the coax
cable is terminated with the onboard terminating resistor of 93 Ohms. This resistor has
the proper value for RG62A/U type of coaxial cable. When no jumper is installed, the coax
connector represents a high-impedance cable interface.
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