Longshine LCS-C842MT - Manual (Page 10)

10/100Base-TX to 100Base-FX Converter
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Loopback Test
This converter features dip switches to activate local and remote
loopback 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
Please make sure that the cables are connected properly before
getting started. Conduct either the local or remote test and not
both at the same time.
Note: Deactivate both local and remote loopback test
functions for mormal converter operations