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I have a long LAN cable that connected to my router and my PC. The problem is my PC doesn't detect the cable, in Windows network adapter settings, LAN adapter keeps connect/disconnect. Now if I connect the cable to a TP-Link LAN hub switch then everything will be OK and I can connect PC to switch using another lan cable. Why this is happening?

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  • Which category is the cable and how long is it? Is it untangled and not in outside environment? Oct 3, 2017 at 10:55
  • It's cat5 and about 30m. It's untangled and is in outside environment about 1 meter. Oct 3, 2017 at 10:57
  • Do you have autonegotiation or is there fixed link speed (10Mb/100Mb/1Gb)? If it's just Cat5, it probably won't handle 1Gb. 100Mb should be fine even with the 1m outside. Oct 3, 2017 at 11:04
  • I really don't know how to fix the link speed so everything is on default settings. My router is TP-Link W8901N. Oct 3, 2017 at 11:13
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    According to the manual, the supported link speed is just 10Mb or 100Mb with auto-negotiation. So in that case, I'd suggest to enforce 10Mb link speed on the PC side. Trying at least Cat5e cable would be good as well, if you have the option. Oct 3, 2017 at 11:38

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