Tripp-Lite T015-POE El Manual Del Propietario página 14

Loop-Back Test
This test checks whether the loopback of the network cable that
is connected to the switch is functioning properly.
Connect the switch port to the loop-back port of the emitter with
a network cable. If the indicator is on, the loop is proper. If the
indicator is off, problems exist within the loop.
Lighting Function
Press the Light key to turn on or turn off the light.
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