PLANET WGT-702 - Manual (Page 14)

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Link Loss Return (LLR)
The fiber ports of the Smart Media Converter have been designed
with an LLR function for trouble-shooting a remote connection.
LLR works in conjunc-tion with LLCF.
When LLR 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 configu-ration with
a good link status using Smart Media Converter for remote
connectivity. Note that LLR is enabled as indicated in the
diagram.
If one of the optical conductors is bad (as shown in the diagram
box below), the converter with LLR enabled will return a no-
link condition to its link partner. With LLCF default, 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.