Installation guide

Testing and Maintaining an RIO Network
138
890 USE 101 00 October 2006
Troubleshooting Fiber Optic Repeaters
Overview Here is a typical point-to-point RIO fiber optic link:
There are well documented procedures for analyzing the wire side characteristics of
this type application, and it is recommended that they be used as a first line of attack
and afterward whenever trouble is suspected.
If the coaxial system is working properly, it will cause the remote I/O LED on FR1 to
illuminate. If that LED illuminates as expected, then the fiber port 1 LED on FR2
should illuminate and the fiber port 2 LEDs on FR1 and FR2 should be OFF.
If the fiber port 1 LED on FR2 does not illuminate, check the Tx and Rx connections
on the fiber link. If the problem persists, substitute a known good repeater for FR2
and repeat the procedure. If the problem still persists, check the drop adapter and
coaxial link at drop #2. If all this still checks out properly, then you have isolated the
problem to faulty fiber cable, and manufacturer’s test procedures must be used.
Head (with RIO Drop #1)
RIO Drop #2
P/S PLC RIO I/O I/O I/O
P/S RIO I/O I/O I/O
Coaxial Cable
FR1 (Drop)
FR2 (Head)
Coaxial Cable
Rx Tx
Tx Rx
This document provided by Barr-Thorp Electric Co., Inc. 800-473-9123 www.barr-thorp.com