GE Security MC100FX-TX-PoE User Manual page 12

Chapter 1: Introduction
LLCF (Link Loss Carry Forward) means that when a device is connected to
the converter and the TP line losses it's link, the converter will cease
transmitting. LLR (Link Loss Return) means when a device is connected to
the converter and the fiber line losses it's link, the converter will cease
transmitting. Both can immediately alarm administrators of the problems of
the linked media and provide efficient solutions to monitor the network.
Link Loss Carry Forward (LLCF)
The MC100FX-TX-PoE incorporates an LLCF function for troubleshooting a
remote connection. When the 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 configuration with a good link
status using the MC100FX-TX-PoE for remote connectivity.
Figure 4: Good Link status
Management
Management
Station
LED lit = established link
If the connection breaks, the MC100FX-TX-PoE will send a link loss forward to
the switch or hub that generates a trap to the management station. The
administrator can then determine the source of the problem.
Figure 5: Link Loss
Management Switch/Hub
Station
LED lit = established link
6
Switch/Hub Media
w/SNM P Converter
LFP ON
TP
LED unlit = no link
Media
w/SNM P Converter
LFP ON
TP
LED unlit = no link
Media
Converter w/SNM P
LFP ON
Fiber TP
Media Switch/Hub
Converter w/SNM P
LFP ON
Broken TP
Fiber
Cable
MC100FX-TX-PoE Media Converter User Manual
Switch/Hub
Station
Management
Station