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CHAPTER 3: LINK FAULT PASSTHROUGH (LFP)
The Link Fault Pass-Through (LFPT) is a troubleshooting feature that combines TX and FX LinkLoss from both the local and remote
media converters, TX-FX/SFP modules. LFPT is enabled by turning on the DIP switch 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.
Management
Station
Switch/Hub
w/SNMP
Media
Management
Switch/Hub
Converter
Media
Converter
LFP ON
LFP ON
Fiber Cable
TP
TP
1
2
3
FIGURE 3-1. LFP FUNCTION
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.