I received this inexpensive network cable tester (RJ45 and RJ11/12) in the last mailbag, and I was curious how it worked, so it's time to tear it apart.

Turns out it's a lot simpler than I expected.

ANENG M469D Cable lan tester Network Cable Tester RJ45 RJ11 RJ12 CAT5 UTP LAN Cable Tester Networking Tool Network Repair https://pileofstuff.ca/r/7z2q0

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This isn't the only way to do it. It's probably not the best way to do it. But it's how I did it.