Posted by : Abdul Munaf Tuesday, September 10, 2013

The RJ45 cable is a standard cable which has four twisted pairs of colors. It is easy to crimp a RJ45 cable and make it into a straight cable or cross the cable as required. To make a straight cable, the ends must be crimped in the same way at each end. When making a crossover cable, some wires of certain colors have to be reversed. Learning how to crimp a RJ45 cable and making straight and cross cables prove to be useful as different types of wires of varied lengths are required to build a network. 


What you need?

  • A reasonable length FTP cable
  • Two RJ45 tips
  • A clip crimp

How to proceed?

Strip the cable to 2 cm at each end and separate the strands. 

They are usually divided into 4 twisted pairs of colors: 

Orange / orange-white 
Green / green-white 
Blue / white and blue 
Brown / brown-white 

Making a straight cable

To make a straight cable, the tips must be crimped typically the same way at each end by respecting the twisted pair size. 

In general, the code used is: 

1) orange-white 
2) orange 
3) green-white 
4) Blue 
5) blue-white 
6) Green 
7) brown-white 
8) brown 

Making a crossover cable

For a crossover cable, swap 1 with 3, and 2 with 6, in the list above. This gives: 

1) green-white 
2) green 
3) orange and white 
4) Blue 
5) blue-white 
6) orange 
7) brown-white 
8) brown 

The standard EIA / TIA 568 (A & B)

Straight cable 

1) white-green / white-green 
2) green / green 
3) white-orange / white-orange 
4) Blue / blue 
5) white-blue / white-blue 
6) Orange / orange 
7) white-brown / white-brown 
8) brown / brown 

For crossover cable 10/100baseT

1) white-green / white-orange 
2) Green / orange 
3) white-orange / white-green 
4) Blue / blue 
5) white-blue / white-blue 
6) Orange / green 
7) white-brown / white-brown 
8) brown / brown 

To complete crossover cable or cross gigabit

On Gbic 1000BaseT eg

1) white-green / white-orange 
2) Green / orange 
3) white-orange / white-green 
4) Blue / white-brown 
5) white-blue / brown 
6) Orange / green 
7) white-brown / blue 
8) Brown / white-blue 

Note: 

Many Gigabits (10/100/1000 multi speed) are auto MDI / MDIX and automatically adapt to the type of cable connected. 

A picture to better understand the coding


Source: Kioskea.net

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