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Some iMcV-Modules include advanced troubleshooting features that help locate
silent failures on the network. Troubleshooting features include:
FO/FX LinkLoss (a.k.a. Fiber LinkLoss or LinkLoss)
TP/TX LinkLoss (a.k.a. Twisted Pair LinkLoss or Reverse LinkLoss)
FiberAlert
Pulsing FiberAlert
It is important to understand how FiberAlert and LinkLoss work, and how they will
react in a specific network configuration, before attempting to install the enclosed
module(s).
** WARNING **
Installing modules without understanding the effects of FiberAlert and LinkLoss can cause
perfectly functioning units to appear flawed or even nonfunctional.
About Link Integrity
During normal operation, link integrity pulses are transmitted by all point-to-point
Ethernet devices. When an B&B Electronics media converter receives valid link
pulses, it knows that the device to which it is connected is up and sending pulses,
and that the copper or fiber cable coming from that device is intact. The
appropriate LNK (link) LED is lit to indicate this.
The B&B Electronics media converter also sends out link pulses from its copper
and fiber transmitters, but normally has no way of knowing whether the cable to
the other device is intact and the link pulses are reaching the other end. The
combination of FiberAlert and LinkLoss allows this information to be obtained,
even when physical access to a remote device (and its link integrity LED) is not
available.
FO/FX LinkLoss
FO/FX LinkLoss is a troubleshooting feature. When a fault occurs on the fiber
segment of a conversion, FO/FX LinkLoss detects the fault and passes this
information to the twisted pair segment. If a media converter is not receiving a
fiber link, FO/FX LinkLoss disables the transmitter on the media converter's
twisted pair port. This results in a loss of link on the device connected to the
twisted pair port.
TP/TX LinkLoss