I’m talking about those network cable testers that have a detachable piece so that you can check installed cables or patch cords. Since you need a pair of wires for current to flow, I am guessing they test different pair combinations to find out which ones are good. But… how do they do when there is only one functioning wire in the whole cable?
Thanks for your answers, but I am still clueless. I guess I should have posed my question in a better way…
If I wanted to test continuity of one of the strands, I would apply a voltage between both ends and check if current flows.
Now the problem is when one of the RJ-45 plugs is plugged to the detachable end, far away from the "base". In order for current to flow through the tested strand, there needs to be a closed loop so that the current comes back somehow.
The thing that puzzles me is… how does the current come back to the base? I guess the "base" uses another strand to create a circuit, but what if that other strand is broken too? Things get more complicated when there is only one healthy strand, because there is no way of closing the circuit considering the only connection between the "base" and the "remote" is a cable with only one healthy strand in it.
I hope this makes more sense.
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