Planet GTP-805A, Руководство пользователя

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4. Link Fault Passthrough (LFP)
The LFP function includes the Link Fault Passthrough function
(LLCF/LLR) and the DIP switch design. LLCF/LLR can
immediately alert administrators to the problem of the link
media and provide an efficient solution to monitoring the net.
The DIP switch’s LFP function can be disabled or enabled.
LLCF (Link Loss Carry Forward) means when a device is
connected to the converter and the TP line loses the link, the
converter’s fiber will disconnect the transmission link. LLR
(Link Loss Return) means when a device is connected to the
converter and the fiber line loses the link, the converter’s fiber
will disconnect the transmission link. Both can immediately alert
administrators to the problem of the link media and provide an
efficient solution to monitoring the net.
Link Loss Carry Forward (LLCF)
The GTP-805A incorporates an LLCF function for troubleshooting
a remote connection. When LFP function is enabled, the FL and
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 configuration with
a good link status using the GTP-805A for remote connectivity.
Media
Converter
Management
Station
Switch/Hub
w/SNMP
Management
Station
Media
Converter
Switch/Hub
w/SNMP
TP TP
Fiber
Cable
LFP ON LFP ON
l LED lit = established link ° LED unlit = no link