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Computer communication may occur through wires, optical fibers, or radio transmissions. Wired networks may use shielded coaxial cable, similar to the wire connecting a television to a videocassette recorder or an antenna. They can also use simpler unshielded wiring with modular connectors similar to telephone wires. Optical fibers can carry more signals than wires; they are often used for linking buildings on a college campus or corporate site and increasingly for longer distances as telephone companies update their networks. Microwave radio also carries computer network signals, generally as part of long-distance telephone systems. Low-power microwave radio is becoming common for ...(100 of 31391 words)