Link Fault Pass-Through (Lfpt) - IMC Networks iMcV-MediaLinX Operation Manual

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.
FX LinkLoss (FXLL)
FX LinkLoss is a troubleshooting feature. When a fault occurs on the fiber segment of
a conversation, FX LinkLoss detects the fault and passes this information to the
twisted pair segment. If a media converter is not receiving a fiber link, 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.
TX LinkLoss (TXLL)
TX LinkLoss is a troubleshooting feature. When a fault occurs on the twisted pair
segment of a conversion, TX LinkLoss detects the fault and passes this information to
the fiber segment. If a media converter is not receiving a twisted pair link, TX
LinkLoss disables the transmitter on the media converter's fiber port. The result is in a
loss of the link on the device connected to the fiber port.

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 iMcV-MediaLinX modules. 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.
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