What is coaxial cable ?

Coaxial cable is a kind of electric wire and signal transmission line, which is generally made of four layers of materials: the innermost is a conductive copper wire, the outer surface of the wire is surrounded by a layer of plastic (used as an insulator and a dielectric), and the insulator is surrounded by a layer of plastic. There is a thin layer of mesh conductor (usually copper or alloy), and then the outermost layer of the conductor is the outermost insulating material as the outer skin.

Coaxial cable can be used for the transmission of analog and digital signals, and is 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 television signals to thousands of households, which is cable television. A cable TV system can load dozens or even hundreds of TV channels, and its transmission range can reach tens of kilometers. Coaxial cables have long been an important part of long-distance telephone networks. Today, it faces increasing competition from fiber optics, terrestrial microwaves and satellites

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