User Manual

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3. Link Passthrough Function
The LFP function includes the Link Fault Passthrough function (LLCF/
LLR) and the DIP Switch design. LLCF/LLR can immediately alarm
administratorsthe issue of the link media and provide efcient solution
to monitor the net. The DIP Switch provides disable or enable the LFP
function.
LLCF (Link Loss Carry Forward) means when a device is connected
to the converter and the TP line loses the link, the converter’s ber
will disconnect the transmission link. LLR (Link Loss Return) means
when a device connected to the converter and the ber line losses
the link, the converter’s ber will disconnect the link of transmit. Both
can immediately alarm administrators the issue of the link media and
provideefcientsolutiontomonitor thenet
3.1 Link Loss Carry Forward (LLCF)
The IGTP-80xT incorporates default LLCF function for troubleshooting
a remote connection; the Fiber/TP ports do not transmit a link signal
until they receive a link signal from the opposite port.
The diagram below shows a typical network conguration with a good
link status using the IGTP-80xT for remote connectivity.
Media
Converter
Management
Station
Switch/Hub
w/SNMP
Management
Station
Media
Converter
Switch/Hub
w/SNMP
TP TP
Fiber
Cable
LFP ONLFP ON
 LED lit = established link  LED unlit = no link