The coaxial cable is composed of two coaxial metal insulated conductors which are insulated from each other. Coaxial cable is often used in the connection between equipment and equipment, or used in a bus type network topology. The coaxial cable's central axis is a copper conductor, plus a layer of insulation material. On the outer side of the insulation material is wrapped by a hollow cylindrical bare copper conductor, and the outer layer is insulation . The electromagnetic field is closed between the internal and external conductors, so the radiation loss is low and the influence of external interference is low. Compared with twisted pair, the coaxial cable has strong anti-interference ability, good shielding performance, stable data transmission and low price, and it can be used without connecting to hub or switch.
Coaxial cable is often used to transmit multi-channel telephones and television. The name of the coaxial cable is related to its structure. Coaxial cable is also one of the most common transmission media in the local area network. It is used to transmit information on a conductor is in accordance with the outer conductor of a layer of the cylindrical inner conductor (a thin core) outside, between two conductors with insulating material isolated from each other for the core structure, the outer conductor and the central axis of the circle in the same axis, so called coaxial cable the design of coaxial cable, it is to prevent the transfer of external electromagnetic interference abnormal signal.
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