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navigate by keyword : telecommunication plural transmission information immediacy communication communications technologies like postal mail pneumatic tubes excluded definition media telecommunications history smoke signals beacons semaphore telegraphs signal flags optical heliographs wires empty space carry electromagnetic paths may divided channels multiplexing allowing single medium transmit concurrent sessions methods longdistance modern sounds coded drumbeats blowing horns whistles centuries generally use electric power telegraph telephone television radio world map concept blue background

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Telecommunication, often used in its plural form, is the transmission of information with an immediacy comparable to face-to-face communication. As such, slow communications technologies like postal mail and pneumatic tubes are excluded from the definition.[1][2] Many transmission media have been used for telecommunications throughout history, from smoke signals, beacons, semaphore telegraphs, signal flags, and optical heliographs to wires and empty space made to carry electromagnetic signals. These paths of transmission may be divided into communication channels for multiplexing, allowing for a single medium to transmit several concurrent communication sessions. Several methods of long-distance communication before the modern era used sounds like coded drumbeats, the blowing of horns, and whistles. Long-distance technologies invented during the 20th and 21st centuries generally use electric power, and include the telegraph, telephone, television, and radio.