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2. Click “Start.”
3. The program will send a testing message looped in the copper segment
and display a pass/fail result.
Remote Loopback
Use a remote loopback (at the remote unit, set the designated DIP switch
to On; at the local unit, keep both loopback Dip switches Off/disabled) to
check that the ber segment is connected properly. Launch a loopback or
diagnostics testing program (see NOTE below) and follow the program
instructions. Typically, the instructions will be similar to the following:
1. Enter the number of test messages (frame packets) to be sent (1–1000).
2. Click “Start.”
3. The program will send a testing message looped in the ber segment
and display a pass/fail result.
NOTE: On a PC, use a program such as Sniffer to conduct the tests.
Other methods include the SmartBits series of testing equipment. If you
do not have access to either method, contact your vendor for advice.
IMPORTANT: Deactivate both the local and the remote loopback test
functions for normal converter operation.
Link Fault Signaling (LFS)
Link Fault Signaling (LFS) is an important function that is extremely
benecial in terms of network status monitoring. The LFS function monitors
both the copper and ber segments to ensure that the Spanning Tree
Protocol can kick in the moment a link failure occurs on either segment.
Set LFS to On for normal operations; set to Off when installing cables
or when testing the network connection.
NOTE: The LFS feature inuences both ber and copper segments.
When disruption occurs on the copper segment, the ber segment will be
disabled. When the ber segment loses signal, the copper segment will
be disabled. Any link failure — including during periods of precautionary
switching to the redundant link and during Link Fault Signaling — will
cause the ALM LED to light up (see LEDs).
To utilize the full benets of LFS, four converters can be used to build a
primary and a secondary path between two switches. The switches must
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