Basic introduction of coaxial cable

oaxial cable is a kind of wire and signal transmission line. It is generally made of four layers of materials: the innermost is a conductive copper wire, and the outer side of the wire is surrounded by a layer of plastic (for insulator and dielectric). There is a thin net-like conductor (usually copper or alloy), and then the outermost insulating material is used as the outer skin of the conductor.

Coaxial cables can be used for the transmission of analog signals and digital signals, and are suitable for a variety of applications, the most important of which are television broadcasting, long-distance telephone transmission, short-distance connections between computer systems, and local area networks. Coaxial cable has developed rapidly as a means of spreading TV signals to thousands of households. This is cable TV. A cable TV system can load dozens or even hundreds of TV channels, and its transmission range can reach tens of kilometers. Coaxial cable has long been an important part of long-distance telephone networks. Today, it faces increasing competition from fiber optics, terrestrial microwaves and satellites