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I have a new CAT6 cable that's 50 metres long and only performs at 100 megabit. I've tested it in a variety of gigabit ports and it never allows a gigabit connection. Is it the length that's the problem and will cutting it in half to make two 25 metre cables make it perform at gigabit speeds ? i.e. is the length likely the problem or is it just a duff cable ?

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    If it's a new prefab cable, then take it back and tell them it doesn't work. – Ryan Foley Jul 26 '14 at 18:05
  • Yes I already got a refund but they said I could keep it anyway. It was an eBay item which probably relates to the poor quality. – James Morrison Jul 27 '14 at 10:10
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Cat6 can provide Gigabit speeds up to 90+ meters.

It is far more likely that one of the terminations is the problem. Gigabit requires the use of all 8 wires, so if one (or both) of the terminations isn't making good contact, then it could run at 100M which only requires 4 wires.

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  • The cable is machine made and has moulded RJ45 connectors which I guess could be faulty. So you suggest I should replace the RJ45 on each end ? – James Morrison Jul 26 '14 at 17:48
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    You can try if you like, but it is more difficult to terminate a Cat6 properly than Cat5/5e. It could also be a problem with the cable itself. If you have access to a cable tester, I would try reterminating but if not, I would probably just replace the cable. – YLearn Jul 26 '14 at 18:27

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