Super User Asked by Esther T on December 7, 2021
I have bought a network cable tester today and tested my newly crimped crossover and 6-1 are not lighting up. At first i thought that the 6-1 led lights are not working.But i tried to switch the cable and now 3-1 are not lightning up. But the cable is working when i connect to my router. I’m actually using it right now.
I have old straight-through cable, manufactured by belkin, still working or in good condition and check it on my new tester and now 1-1 are not lightning up. But the cable still in working condition.
Please help, is there a problem in my new tester?
It's common for "newly crimped" cables to have problems (that's why cable testers exist, I guess).
One common problem is using the wrong kind of cable. The insulation-displacement contacts in the plugs are designed to work with specific cable thickness and insulation thickness. Also single-strand cable won't work in a multi-strand connector or vice versa.
Another common problem is not compressing the connections correctly, which is why you need a crimping tool and not just a screwdriver. If the contact is not compressed far enough it won't penetrate the insulation. Worse still, it will sit a little bit high in the plug, which will push the contact in the socket a little too far and bend it. The next time you insert a correctly-terminated plug in that socket, the contact in the plug can miss the bent contact in the socket.
So, bent or dirty contacts in the socket on the tester is a likely explanation. But your experiments were giving inconsistent results so you need more tests.
Answered by Phil McKerracher on December 7, 2021
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