ᐅ How to identify faults in a cable within a LAN?

Created on: 25 Nov 2020 06:05
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bauherr201615
Hello, I have installed 5 Cat7 network cables in the house. They all start at a patch panel and then go to the network outlets.

The problem now is that one of them doesn't work. I have already replaced the outlet once and connected it to a different port on the patch panel. Each time, the tester shows that channel 8 is not working.

How can I identify the cause here?
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guckuck2
25 Nov 2020 06:33
The tester is already measuring the continuity.

If both ends have been properly secured, which has been confirmed repeatedly, then the cable probably needs to be replaced.
rick201825 Nov 2020 07:00
I am afraid the problem is more likely with the termination. With stranded wires, this would already be ruled out. If only one wire were faulty, it should still operate at 100 Mbps or at least establish some kind of connection.
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guckuck2
25 Nov 2020 07:09
5 network cables with 8 conductors each provide 80 termination points. The likelihood that the (multiple) terminations are causing the issue... hmm. Twisted pairs can also be identified using a tester. I’m more inclined to suspect a cable defect. But you’re right, if conductor 8 is damaged, 100 Mbit should still work – since pairs 1, 2, 3, and 6 are required for that.
11ant25 Nov 2020 16:21
guckuck2 schrieb:

But you are right, if wire 8 is broken, 100Mbps should work – wires 1, 2, 3, and 6 are required for that.

Are you sure that a router will automatically fallback to 100Mbps if one wire is not connected?
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rick201825 Nov 2020 16:24
Usually, yes.
Tarnari25 Nov 2020 16:34
Perhaps the non-functioning outlet is installed according to standard B, while the rest follow standard A, or vice versa?