Longshine LCS-C841MC - Manual (Page 16)

1000Base-T to 1000Base-SX/LX Converter
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check if the fiber segment is functioning properly at remote
site. The default setting for RLB is Disable. Turn the
remote switch’s setting Enable to perform the Remote
Loopback function test, but disable the LLB and RLB at
the converter attached locally.
Note: Enabling the RLB function means, the converter’s
normal function will be stopped.
Fig: Remote Loopback (RLB)
NOTE: While performing Loopback test, either Remote or
Local, it is recommended to test with more than 50% of full
loaded traffic so LED indicator can work better. The
lesser traffic will affect the LED’s brightness.