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telephones

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dufferbrown
telephones

hi guys,I have installed some cat 5 cables from a patch panel to several RJ45 points. I have put an end to end tester on them and it says they are fine. If I patch the internet on to them it also runs fine. But if i patch a phone which i know works on to it i cannot get a line. If I plug the same phone straight into the patch panel I get a line no problem, what could the problem be? I have ruled out interference plus the runs are too short for that anyway.
i appreciate any help you could give me