Coaxial cable is widely used in many countries for distributing cable television and telephone services. The cable has a central copper conducting core sheathed in insulation, then another ring of conductor and an outer core of insulation. Cable circuits take either a tree and branch form or a switched star form, and need to have signal amplifiers installed at points along the network. The amplifiers can be one-way or two-way; the two-way amplifiers permit the provision of interactive services over the network, allowing consumers to select from a menu of services (for example, home shopping, videos on demand, or educational services). Cable networks are often fed services and programs by satellite communications systems for local redistribution. Coaxial resources   Author(s), Title

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