PLANET FT-801 - Manual (Page 7)

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Side View (FT-80X)
One DIP switch for Link Fault Pass Through (LFP) feature, “ON”
to turn-on the LLCF and LLR detection. And “OFF” to turn–off this
feature. Please refer to the following sections for more.
DIP Switch for LFP function.
Chapter 5
Link Fault Pass through (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. The DIP Switch provides
disable or enable the LFP function.
LLCF (Link Loss Carry Forward) means when a device connected
to the converter and the TP line loss the link, the converter’s fiber
will disconnect the link of transmit. LLR (Link Loss Return) means
when a device connected to the converter and the fiber line loss
the link, the converter’s fiber will disconnect the link of transmit.
Both can immediately alarm administrators the problem of the link
media and provide efficient solution to monitor the net.