The CAT-5 is a standard cable which has four twisted pairs of colours. It is easy to crimp a RJ45 connector to CAT-5 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 colours have to be reversed.
CAT-5 cable is usually divided into 4 twisted pairs of colours:
Orange
