Allen-Bradley ControlNet 1786-RPFS Installation Instructions Manual page 8

8 ControlNet Modular Repeater Short-distance Fiber Module
If only one channel is wired, you can use Channel 1 or Channel 2.
The zipcord uses a duplex cable. Duplex cables use a single cable that
contains 2 separate fibers, one for transmit and one for receive.
To wire the module:
1. Hold down the latch and insert the Channel 1 zipcord connector into
and until the pins and latch lock into place.
Make sure you insert the blue pin (receive) of the zipcord connector
into and the black pin (transmit) into .