A network card may have several types of connectors, with the most common being:
* An RJ45 connector;
* A BNC connector (coaxial cable).
The RJ-45 is the one which interests us here, as it it the most widely used. The cables used are called twisted pairs, as they are made up of four pairs of wires braided together. Each pair of wires is made up of a solid-coloured wire and a wire marked with stripes of that same colour. It is highly recommended to use a category 5 cable between 3 and 90 metres long. There are two wiring standards TIA/EIA 568A and TIA/EIA 568B which differ in the position of the orange and green pairs, defined by the Electronic Industry not allowed/Telecommunications Industry not allowed: