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Green Building Bible, Fourth Edition
Green Building Bible, fourth edition (both books)
These two books are the perfect starting place to help you get to grips with one of the most vitally important aspects of our society - our homes and living environment.

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General: CAT6 male plug

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  1.  
    • CommentAuthorRex
    • CommentTimeSep 8th 2026
     
    What ho one and all,

    Having managed to fish the CAT6 cable fro the loft (second floor?) to the g/f office space, I need a 3m length to connect form the wall socket to the router (when Openreach finally manage to install the fibre; at the moment, this year, next year sometime, never!!)

    The cable is a factory made, 50m with male at each end. I wonder about cutting a 3m length off, and fitting a male plug to each cut end, then I will have the necessary extension. But.... how do I know which wiring standard the factory fitted plugs? Either T568A or T568B? Is there a way to determine? Or is it just a case of wire one way and if it does not work, try the other?

    Although I hardly need an RJ45 network tester, by chance, my favorite Lidl has them on sale today so bought one for the mega sum of £4.99.
  2.  
    The electrons don't care which way round the orange and green cores are wired, so long as it's consistent at both ends of the cable. So bring both ends of the cable together and use a continuity tester to work out which colour goes on which side.

    But, £5 should buy you a factory-made 3m extension cable with no need to fit plugs yourself, or buy the necessary crimping tool, or learn how to do it.
    • CommentAuthorRex
    • CommentTimeSep 8th 2026
     
    Good point about the off the shelf cable. May return the tester and buy one. Certainly don't need another tool.
  4.  
    If you have spare length, why not run the through -the-floor cable clipped all the way round the skirting to wherever the computer is going to be and plug it straight in? No need for extension cables and plug/sockets, all of which add impedance?

    If you want it to emerge neatly from the plasterboard, you can have it come out from a flex outlet plate

    https://www.screwfix.com/p/british-general-900-series-20a-unswitched-flex-outlet-white/21114
    •  
      CommentAuthorfostertom
    • CommentTimeSep 8th 2026 edited
     
    Went looking for the RJ45 network tester, none at my Lidl. Got some v long phone extension leads, which soon or from the outset failed, wd like to rehabilitate them by
    Posted By: WillInAberdeenfit plugs yourself, or buy the necessary crimping tool, or learn how to do it

    Aha! https://www.lidl.co.uk/p/parkside-network-cable-tester/p10053783 - is at my other Lidl!
  6.  
    RJ45 is for Ethernet, 8 cores in 4 twisted pairs

    RJ11 is for phone extensions, 4 cores all twisted round each other. Better chance of connecting this one by hand successfully!

    Iirc!

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