Planet IGTP-802T, User Manual, Page: 29 / 36

29
If the connection breaks, the IGTP-80xT whose link is lost forwards to
the switch/hub which generates a trap to the management station. The
administrator can then determine the source of the issue.
Media
Converter
Management
Station
Switch/Hub
w/SNMP
Management
Station
Media
Converter
Switch/Hub
w/SNMP
TP TP
Broken
Fiber
Cable
LFP ON LFP ON

LED lit = established link

LED unlit = no link
Note
The converter is shipped with the default LFP (LLCF/
LLR) function disabled. This feature can also be turned
on on-purpose. If you are familiar with the network
installation and for diagnostic purpose (i.e. check which
end is broken), you can turn it on and the converter will
take effect immediately. Otherwise, please put it in the
default position.
3.2 Link Loss Return (LLR)
The fiber ports of the IGTP-80xT have been designed with an LLR
function for troubleshooting a remote connection. LLR works in
conjunction with LLCF.
When LLR is enabled*, the port’s transmitter will shut down when
its receiver fails to detect a valid receive link. LLR should only be
enabled on one end of the link and is typically enabled on either the
unmanaged or remote device.
The diagram below shows a typical network configuration with a good
link status using the IGTP-80xT for remote connectivity. Note that LLR
is enabled as indicated in the diagram.