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CHAPTER 3: LINK FAULT PASSTHROUGH (LFP)
The LFP function includes the Link Fault Pass Through function (LLCF/LLR) and the DIP Switch design. LLCF/LLR can immediately
alarm administrators the problem of the link media and provide efficient solution to monitor the net. By setting the DIP switch, you
can disable or enable the LFP function.
LLCF (Link Loss Carry Forward) means that when a device connected to the converter and the TP line loses the link, the converter’s
fiber will disconnect the link of transmit. LLR (Link Loss Return) means that when a device connected to the converter and the fiber
line loses the link, the converter’s fiber will disconnect the link of transmit. Both can immediately alarm administrators that there is
a problem with the link media.
NOTE: The LFP function is turned off as default. This feature can also be turned on via the side DIP-Switch. If you are not familiar
with the network installation and for diagnostic purposes (i.e. check which end is broken), you can turn it on and reset the converter
to make it take effect. Otherwise, keep it in the default position.
Management
Station
Switch/Hub
w/SNMP
Media
Management
Switch/Hub
Converter
Media
Converter
LFP ON
LFP ON
Fiber Cable
TP
TP
FIGURE 3-1. LFP FUNCTION
