Link Fault Pass Through Function - KTI Networks KGC-320 Installation Manual

The data rate on twisted-pair segment depends on the link speed finally established with the link partner.

3.3 Link Fault Pass Through Function

Description
When the Link Fault Pass Through (LFPT) function is enabled and 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.
The following example illustrates a link fault occurs on the fiber cable (any one cable in a duplex fiber
connection). The link fault is forwarded to both Gigabit link partners finally by LFPT operation of two media
converters.
Both Gigabit devices will also detect a link fault on each Cat.5 connection, although the real fault occurs on the
fiber connection exactly.
The following example 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
The 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
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