Link Passthrough Function; Link Loss Carry Forward (Llcf) - Planet IGTP-802T User Manual

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 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 is connected
to the converter and the TP line loses the link, the converter's fiber
will disconnect the transmission link. LLR (Link Loss Return) means
when a device connected to the converter and the fiber line losses
the link, the converter's fiber will disconnect the link of transmit. Both
can immediately alarm administrators the issue of the link media and
provide efficient 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 configuration with a good
link status using the IGTP-80xT for remote connectivity.
Management Switch/Hub Media Media Switch/Hub Management
Station w/SNMP Converter Converter w/SNMP Station
LFP ON LFP ON
Fiber
TP TP
Cable
 LED lit = established link  LED unlit = no link
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