B&B Electronics 855-12840--49 - Manual - Manual (Page 12)

8
Link Fault Pass Through
Link Fault Pass Through (LFPT) is a troubleshooting feature that combines TX and
FX LinkLoss from both the local and remote media converter modules (only
available on the McLIM the 100 Mbps TX/FX -00, -10, -20, -30). LFPT is enabled
by turning on both FX and TX LinkLoss on both modules. This feature allows
both end segments of the conversion to detect link faults occurring in the media
conversion chain. FiberAlert can also be added to the remote side of the pair to
further assist in locating a fault.
FiberAlert
FiberAlert minimizes the problems associated with the loss of one strand of fiber.
If a strand is unavailable, the B&B Electronics device at the receiver end notes the
loss of link. The device will then stop 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.
WARNING
Enable FiberAlert on ONE side of a media conversion only;
enabling it on both sides will keep both transmitters off indefinitely!
Product with enabled —Remote Site stops transmitting
Local Link LED is OFF indicating a break in the fiber loop
FiberAlert
XMT
RCV
LED
Remote Site
Local Site
LED OFF = Broken Link
LED
XMT
RCV
Cable Break