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Cabling

Although you can buy cables at specific lengths (e.g. 2 metres, 5 metres, 10 metres, etc) in shops, or even buy them to your specified measurements, it is often easier to make them yourself. This way you can make them to the required length.

Here I have explained how to make cables for UTP (RJ45)

UTP RJ45

What you will need:

  • Length of the UTP (Unshielded Twisted Pair) cable (e.g. xx metres)
  • RJ45 Plugs
  • RJ45 cable boots (1 for each RJ45 plug) - not essential but preffered as they re-enforce the fitting of the cable into the RJ45 plug
  • RJ45 Crimp Tool

The RJ45 plugs should have the following wire order: (where pin 1 is on the left when you look at the RJ45 plug from behind and it is upside down - i.e. the latch that sticks out is pointing down and towards you)

Patch Cable   Crossover Cable

EIA/TIA 568B Wiring Standard
Both ends of the cable should be wired like this:

  Crossover Cable Wiring
Wire one end of the cable using the patch cable ordering and the other end like this (i.e. swap pins 2 and 6):
PIN Wire Colour   PIN Wire Colour
1
White with Orange Stripe  
1
White with Green Stripe
2
Orange with White Stripe  
2
Green with White Stripe
3
White with Green Stripe  
3
White with Orange Stripe
4
Blue with White Stripe  
4
Blue with White Stripe
5
White with Blue Stripe  
5
White with Blue Stripe
6
Green with White Stripe  
6
Orange with White Stripe
7
White with Brown Stripe  
7
White with Brown Stripe
8
Brown with White Stripe  
8
Brown with White Stripe

To make the cables:

  • Cut the cable to length
  • Strip the ends of the cable (the crimp tool will probably have a wire stripping gizmo on it to strip the wires to the right length)
  • Put the RJ45 cable boots onto the cable (you do not actually need these, but they do serve three purposes:- They look good, they help prevent damage to the cable from bending just behind the RJ45 plug and if you use different coloured boots, they can help identify which cable in the hub the individual wires into the RJ45 plugs (in the order shown in the tables above)
  • Use the crimp tool to crimp the wires into the plug. double check that the wires are in the correct order, have been crimped properly, etc.