AAxeon FCU-2802SC Manuale d'uso - Pagina 8

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If the connection breaks, the FCU-280x link loss forwards to the
switch/hub that generates a trap to the management station.
The administrator can then determine the source of the issue.
Management
Switch/Hub
Media
Station
w/SNMP
Converter
LFP ON
Broken
TP
Fiber
Cable
l LED lit = established link
° LED unlit = no link
*Units are shipped with the LFP function enabled (ON).
Link Loss Return (LLR)
The fi ber ports of the FCU-280x have been designed with an
LLR function for troubleshooting a remote connection. LLR works
in conjunction with LLCF.
When
LFP
function
is
enabled
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 confi guration with
a good link status using the FCU-280x for remote connectivity.
Note that LLR and LLCF are enabled as indicated in the diagram.
14
Media
Switch/Hub
Management
Converter
w/SNMP
Station
LFP ON
TP
*(by
default),
the
port's
Management
Switch/Hub
Media
Station
w/SNMP
Converter
LFP ON
Fiber
Cable
l LED lit = established link
° LED unlit = no link
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.
Management
Switch/Hub
Media
Station
w/SNMP
Converter
LFP ON
Broken
TP
Fiber
Port 2
Link Loss Carried Forward
Link Loss Returned
l LED lit = established link
° LED unlit = no link
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
Note
converter to make it take effect. Otherwise, please
leave it at the default position.
Media
Switch/Hub
Station
Converter
LFP OFF
Media
Management
Station
Converter
Switch/Hub
LFP ON
TP
Port 1
Link Loss Carried Forward
15