Coaxial cable, or coax for short, gets its name from the fact that there are two conductors that share the same axis. As shown in the figure, coaxial cable consists of:

Note: There are different types of connectors used with coax cable.

Coaxial cable was traditionally used in cable television capable of transmitting in one direction. It was also used extensively in early Ethernet installations.

Although UTP cable has essentially replaced coaxial cable in modern Ethernet installations, the coaxial cable design has been adapted for use in: