Link Fault Pass Through Function - KTI Networks KGC-301 Installation Manual

3.3 Link Fault Pass Through Function

When the Link Fault Pass Through (LFPT) function is enabled. When the media converter detects a
link fault on one port segment, it will force the other port segment link down. It looks like that a link
fault is passed from one port to the other.
Scenario 1: The following drawing illustrates a link fault occurs on the fiber cable (any one cable in a
duplex fiber connection). The link fault is forwarded to both copper link partners finally by LFPT
operation of two media converters.
Both Ethernet devices will also detect a link fault on each Cat.5 connection, although the real fault
occurs on the fiber connection exactly.
Scenario 2: The following drawing illustrates a real link fault occurs on one Cat.5 and the link fault is
passed to the other Cat.5 over two converters and the fiber cable by LFPT operation. Finally, the other
link partner also detects a link fault.
Advantage
This function allows two remote link partners of the media converters detect the link fault finally no
matter where the exact fault occurs. It allows the upper application takes necessary action in case a real
link fault occurs in any cable segment.
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