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If one of the optical conductors is bad (as shown in the diagram
box below), the converter with LLR function will return a no-link
condition to its link partner. With LLCF function also enabled,
the no-link condition is carried forward to the switch/hub
where a trap is generated to the management station, and the
administrator can then determine the source of the loss.
Media
Converter
Management
Station
Switch/Hub
w/SNMP
Station
Media
Converter
Switch/Hub
Fiber
Cable
LFP OFF
LFP ON
l
LED lit = established link
°
LED unlit = no link
Media
Converter
Management
Station
Switch/Hub
w/SNMP
Station
Media
Converter
Management
Switch/Hub
TP
TP
Broken
Fiber
LFP ON
LFP ON
l
LED lit = established link
°
LED unlit = no link
Port 2
Port 1
Link Loss Carried Forward
Link Loss Returned
Link Loss Carried Forward
Note
LFP function is turned on by default. This feature
can also be turned off via the side DIP-switch.
If you are familiar with the network installa-
tion, for diagnostic purpose (i.e. check which
end is broken), you can turn it off and reset the
converter to make it take effect. Otherwise, please
leave it at the default position.
