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rj45 connectors. Does the order of wire cores matter?

Discussion in 'Hardware' started by mike42, 7 Dec 2018 at 6:42 PM.

  1. mike42

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    Cabling up some ethernet leads for the first time and was wondering as long as I cable them the same way at both ends does it matter it I don't follow the conventions?
     
  2. rsgaz

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    Yes, it does matter. You must keep the pairs together. You may notice the green pair is split either side of the blue pair which is backwards. You can't just ignore that and go, say, 1white/orange, 2orange, 3white/green, 4green, etc, because you've just separated the green and blue pairs by doing that. They are twisted in pairs to reject any interference from outside the cable, and reduce them outputting interference themselves. Interference is even picked up between pairs within a single cable.

    Technically you could transpose colours to different colours, but that would take more time and working out than just doing it properly. (That is of course, how a 'crossover cable' is wired, you swap the orange and green pairs at one end, but each pair is still kept in a pair.)
     
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  3. rsgaz

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    Didn't spot that bit initially. By Googling for the code, you'll probably find the two different colour codes. In the UK, we use 568B...

    [​IMG]
     
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  4. mike42

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    Really helpful couple of posts there rzgaz. Many thanks indeed !
     
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