Planet FT-802S50 [8/18] Link loss carry forward llcf

Link Loss Carry Forward (LLCF)

FT-80X incorporates an LLCF function for troubleshooting a

remote connection. When LFP function is enabled, the FL/TP ports

do not transmit a link signal until they receive a link signal from

the opposite port.

The diagram below shows a typical network conguration with a

good link status using FT-80X for remote connectivity.

If the connection breaks, FT-80X that link loss forward to the

switch/hub that generates a trap to the management station. The

administrator can then determine the source of the problem.

*Units are shipped with the LFP function enabled (ON).

Link Loss Return (LLR)

The ber ports of FT-80X have been designed with an LLR function

for troubleshooting a remote connection. LLR works in conjunction

with LLCF.

When LFP function is enabled *(by default), 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 FT-80X for remote connectivity. Note that

LLR and LLCF are enabled as indicated in the diagram.