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Summary：The name "coaxial cable" comes from its structure. Coaxial cable is also one of the most common transmission media in surveillance. It consists of a pair of conductors that transmit information, with a cylindrical outer conductor wrapped around an inner conductor (a thin core), and the two conductors separated by insulating material. The centers of the outer conductor and the central core are on the same axis.
The name "coaxial cable" is derived from its structural design. It is one of the most common transmission media used in surveillance systems. The pair of conductors used to transmit information is configured such that a cylindrical outer conductor encloses an inner conductor (a thin core), with insulating material separating the two; because the outer conductor and the central core share the same axis, it is called a "coaxial" cable. It has an impedance of 75 ohms. This specific design serves to prevent external electromagnetic interference from disrupting signal transmission.
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