Telephone cables are a necessary element of any application requiring connections between various stations (telephone, telegraph, transmission, for application processing, etc.) When choosing an appropriate telephone cable, a few specific parameters need to be taken into account. The cross section area and the structure of the cable (such as the number of wires) have to be considered. Wires are usually made of copper. You also need to pay attention to the external size of the cable, as well as the colour of the sheath (usually black or white).