Installation Guide

4007998 Rev B Prisma Gigabit Ethernet Media Converter Module Installation Instructions 11
About LinkLoss and FiberAlert, Continued
What Is FiberAlert?
FiberAlert minimizes the problems associated with the loss of one strand of fiber. If
a strand is unavailable, the device at the receiver end notes the loss of link. The
device then stops transmitting data and the link signal until a signal or link pulse is
received. The result is that the link LED on BOTH sides of the fiber connection will
go out indicating a fault somewhere in the fiber loop.
Using FiberAlert, a local site administrator is notified of a fault and can quickly
determine where a cable fault is located.
Note: Enable FiberAlert on ONE side of a media conversion only; enabling it on
both sides would keep both transmitters off indefinitely!
Using FiberAlert and LinkLoss
Modules ship from the factory with troubleshooting features disabled. To
enable/disable these features, please refer to the Configuration Instructions earlier
in these instructions, or the product’s help file.
LinkLoss/FiberAlert Comparison Table
The following table provides an overview of the troubleshooting features, their
functionality and the recommended settings for a pair of media converters in a
typical central/main site to remote site application.
Feature Fault Location Disabled LEDs Enable At:
TX LinkLoss Twisted Pair Fiber Remote Site Only
FiberAlert Fiber Fiber Remote Site Only
If you are unsure of how best to implement these features in your configuration,
contact technical support. Refer to For Information later in these instructions for
contact information.