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Why would a twisted pair cable deteriorate and how to test it? [closed]

        One of my outdoor PoE IP cameras recently lost connectivity (it would go off and on until a week later it went off permanently). On the switch end, no LEDs on the socket were on — like the cable was unplugged.
Upon troubleshooting I found that the camera itself was fine (worked with another cable), so the problem was obviously the cable. I re-crimped both ends' connectors. No difference. LAN tester showed that, electrically, all the 8 wires were intact. Yet, the cable refused to connect the camera. What could possibly happen to it so that it won't work anymore even though all the wires are still conductive? What sort of tester can be used to determine its ability to work (apart from connecting real PoE IP cameras)?

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