How to test an Ethernet Cable

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Connect the cable

Connect one end of the cable on one half of the tester each.
If you are testing jacks you can just connect them with a known good patch cable.
If the other side of your cable is already connected to a switch or some other device you can connect the MASTER device only.
Only do this with cable testers you trust, since crappy cable testers might not limit the current they send through the data lines.

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