Longshine LCS-C842SC - Manual (Page 8)

Enhanced 10/100Base-TX to 100Base-FX Converter
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Link Fault Signaling (LFS)
LFS is a “nice to have” function that is extremely
beneficial in terms of network status monitoring. The
LFS LED will immediately light to indicate when a
cable has been severed or when some other cause of
disruption in service has occurred. The LFS function
monitors both copper and fiber segments giving a total
connection status report.
Set LFS to ON position for normal operational use.
Set LFS to OFF position when installing cables or
when testing the network connection.
Note: The LFS feature influences both fiber and
copper segments. Therefore, when disruption occurs
on either segment, the LFS feature will be activated
and the LED will light to indicate that the entire
connection is down.
To appreciate the full benefits of LFS, four converters
can be used to build a primary and a secondary link.
They must be connected to a switch that supports
Spanning Tree or Fast Spanning Tree protocols. By
default, transmission of data will travel via the primary
link. Once a fault has been detected, transmission will
Enhanced 10/100Base-TX to 100Base-FX Converter
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automatically be switched to the secondary link,
resulting in ‘non-stop’ network connectivity.
Loopback Test
This Converter features DIP switches to activate both
local and remote loopback diagnostic test functions.
Use local loop back to check if the copper segment is
connected properly, and use remote loop back to
check if the fiber segment is connected properly.
Please see Diagram below:
Dip Switch 6 ON: enables local loop back function
OFF: disables local loop back function
Dip Switch 7 ON: enables remote loop back function
OFF: disables remote loop back function
Make sure that the cables are connected properly
before getting started. Conduct either the local or
remote test, not both at the same time. Follow the
steps below to perform the diagnostic tests.