TP-Link TL-SG2224WEB - Manual (Page 28)

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Web Smart Gigabit Switch Family User's Guide TL-SG2216WEB/TL-SG2224WEB
the quality of the cables connected to the port. Some of the possible problems
than can be diagnosed include opens, shorts, cable impedance mismatch,
bad connectors, termination mismatch, and bad magnetics. It can also test the
distance to the problem location, with the precision of ±1 meter.