B&B Electronics 856-19717--57 - Manual - Manual (Page 10)

7
FiberAlert
FiberAlert minimizes the problems associated with the loss of one strand of fiber.
Normally when a single strand of fiber is lost, the transmitting side of the connection
is unaware that there is a fault. FiberAlert returns faults back on the fiber they came
in on.
Using LinkLoss and FiberAlert
In a typical central site to remote site media conversion, it is recommended the
LinkLoss and FiberAlert features are enabled as indicated in the following:
FiberAlert and LinkLoss
Feature Enabled Fault Location Port Affected
FiberAlert Remote Side Only Fiber Fiber
TX LinkLoss Remote Side (or both) Twisted Pair Fiber
FX LinkLoss Host Side (or both) Fiber Twisted Pair
WARNING
Do not enable FiberAlert on both modules when using them in pairs. This will cause them to
lock up when a fault occurs on the fiber. Only enable FiberAlert on the remote module.
Link Fault Pass Through (LFPT)
Link Fault Pass-Through (LFPT) is a troubleshooting feature that combines TX and FX
LinkLoss from both the local and remote IE-MiniFiberLinX-II. LFPT is enabled by
turning on both FX and TX LinkLoss on both modules. This feature allows either end
of the conversion to detect a link fault occurring at the other end of the media
conversion chain.
Regardless if there is a break in segment 1, 2 or 3, the link will drop on the switches
at both ends. The link fault is passed through the media conversion and is observed at
each end. It acts just like it would if the devices were directly connected.