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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
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.
Local Loopback
1. Test Condition setup – for the function to produce an accurate
result, be sure to set switches according to the table below:
Test Condition
DIP Switches 1 2 3 4 5 6 7
Converter A OFF FD 100 FD OFF ON OFF
Converte B OFF FD 100 FD OFF OFF OFF
9 10
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