Interlogix MCR300-1T/1S - Manual (Page 12)

6 IFS MCR300-1T/1S User Manual
LFP ON
TP
Station
Management Switch/Hub Switch/Hub Media Media Management
w/SNM P Converter Converter w/SNM P Station
Broken
Fiber
Cable
TP
LFP ON
LED lit = established link LED unlit = no link
* The factory default setting for the LFP function is "off".
Link Loss Return (LLR)
The fiber ports of MCR300-1T/1S have been designed with an
LLR function for troubleshooting a remote connection. LLR
works in conjunction with LLCF.
When the LFP function is enabled, the port’s transmitter shuts
down when its receiver fails to detect a valid connection. 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 configuration with
a good link status using MCR300-1T/1S for remote
connectivity. Note that LLR and LLCF are 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 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