Coaxial cables were the ?rst cable types used in LANs. As shown in Figure coaxial cable gets its name because two conductors share a common axis; the cable is most frequently referred to as a "coax." A type of coaxial cable that you may be familiar with is your television cable.
The components of a coaxial cable are as follows:
A center conductor, although usually solid copper wire, is sometimes made of stranded wire. An outer conductor forms a tube surrounding the center conductor. This conductor can consist of braided wires, metallicfoil, or both. The outer conductor, frequently called the shield,serves as a ground and also protects the inner conductor fromEMI.
An insulation layer keeps the outer conductor spaced evenlY from the inner conductor. A plastic encasement (jacket) protects the cable from damage.
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