User Manual

11
station. The administrator can then determine the source of the
problem.
Media
Converter
Management
Station
Switch/Hub
w/SNMP
Management
Station
Media
Converter
Switch/Hub
w/SNMP
TP TP
Broken
Fiber
Cable
LFP ONLFP ON
l LED lit = established link ° LED unlit = no link
*Units are shipped with the LFP function disable (OFF).
Link Loss Return (LLR)
The ber ports of the FCU-1802Px have been designed with an
LLR function for troubleshooting a remote connection. LLR works
in conjunction with LLCF.
When LFP function is enabled, the port’s transmitter shuts 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 conguration with a
good link status using the FCU-1802Px for remote connectivity.
Note that LLR and LLCF are enabled as indicated in the diagram.
Media
Converter
Management
Station
Switch/Hub
w/SNMP
Station
Media
Converter
Switch/Hub
Fiber
Cable
LFP OFFLFP ON
l LED lit = established link ° LED unlit = no link