Plusnet one router won't work with a 6m long ethernet cable

[#1]

FWIW - not sure if this is of any interest or directly relevant...

Just out of curiosity - I've dug out an old, super cheap, 15 metre cable, cat5e 10/100BaseT (supposedly) - cost me £2.38 (!) inc delivery, from an Amazon third party seller, back in 2011. 

Seems to work absolutely fine between my PC and recently supplied Plusnet Hub Two (as it did with ADSL2+ router(s) 'back in the day').

Might be worth considering getting a Hub Two - plenty on eBay, or possibly 'free' from Plusnet if upgrading/recontracting (?).

[#2]

They sent me a new. Still the same problem. Might just got back to my old net gear router.

[#3]

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@norm90 wrote:
They sent me a new.

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Just to clarify - so did they sent you a new Hub One, or a new Hub Two?

Something very odd if both wouldn't work with a mere 6 meter of LAN cable.

[#4]

Sorry it's a new hub two that replaced a hub two.

[#5]

Sounds to me like that 6mtr cable is faulty in one way or another.

[#6]

Did you, by any chance, try swapping out the switch connected to the device? The one you added to the chain seems to work with the hub.