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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.
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