Interlogix MC201-1P/1FS - Manual (Page 12)

6 IFS MC201-1P/1FS User Manual
Link Loss Return (LLR)
The fiber ports of the MC201-1P/1FS have been designed with
an LLR function for troubleshooting a connectivity issue. LLR
works in conjunction with LLCF.
When 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 MC201-1P/1FS 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 fiber 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
switch/hub where a trap is generated to the management
station.