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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 occurs in any cable segment.
Methods to enable the function
The LFPT function can be enabled by:
Hardware setting:
DIP SW6 is set to ON position
Software setting:
Web management ->
Configuration -> System -> [Link fault pass through]
