page_title: Telecommunication
hierarchical_section_title: Telecommunication
caption_attribution_description: Deutsch: Die größte Erdfunkstelle der Welt bei Raisting (in der Nähe des Ammersees) ist eine Bodenstation für die Kommunikation mit Nachrichtensatelliten und ist mit ihren großen Parabolantennen weithin sichtbar. English: A parabolic satellite communication antenna at the biggest facility for satellite communication in Raisting, Bavaria, Germany. This type of parabolic antenna is called a Cassegrain antenna. The radio waves emerge from the hole in the center of the dish and are focussed on a convex subreflector suspended on the supports in front of the dish. The waves are reflected back toward the main dish, which reflects them forward to form the outgoing beam aimed at the satellite. Français&#160;: Le plus gros centre de communication satellitaire à Raisting, en Bavière (Allemagne).
context_page_description: Telecommunication is the transmission of information by various types of technologies over wire, radio, optical or other electromagnetic systems. It has its origin in the desire of humans for communication over a distance greater than that feasible with the human voice, but with a similar scale of expediency; thus, slow systems are excluded from the field.
  The transmission media in telecommunication have evolved through numerous stages of technology, from beacons and other visual signals, to electrical cable and electromagnetic radiation, including light. Such transmission paths are often divided into communication channels, which afford the advantages of multiplexing multiple concurrent communication sessions. Telecommunication is often used in its plural form, because it involves many different technologies.
context_section_description: Telecommunication (from Latin communicatio, referring to the social process of information exchange, and the Greek prefix tele-, meaning distance) is the transmission of information by various types of technologies over wire, radio, optical or other electromagnetic systems. It has its origin in the desire of humans for communication over a distance greater than that feasible with the human voice, but with a similar scale of expediency; thus, slow systems (such as postal mail) are excluded from the field.
  The transmission media in telecommunication have evolved through numerous stages of technology, from beacons and other visual signals (such as smoke signals, semaphore telegraphs, signal flags, and optical heliographs), to electrical cable and electromagnetic radiation, including light. Such transmission paths are often divided into communication channels, which afford the advantages of multiplexing multiple concurrent communication sessions. Telecommunication is often used in its plural form, because it involves many different technologies.
  Other examples of pre-modern long-distance communication included audio messages, such as coded drumbeats, lung-blown horns, and loud whistles. 20th- and 21st-century technologies for long-distance communication usually involve electrical and electromagnetic technologies, such as telegraph, telephone, television and teleprinter, networks, radio, microwave transmission, optical fiber, and communications satellites.
  A revolution in wireless communication began in the first decade of the 20th century with the pioneering developments in radio communications by Guglielmo Marconi, who won the Nobel Prize in Physics in 1909, and other notable pioneering inventors and developers in the field of electrical and electronic telecommunications. These included Charles Wheatstone and Samuel Morse (inventors of the telegraph), Alexander Graham Bell (inventor of the telephone), Edwin Armstrong and Lee de Forest (inventors of radio), as well as Vladimir K. Zworykin, John Logie Baird and Philo Farnsworth (some of the inventors of television).
caption: Earth station at the satellite communication facility in Raisting, Bavaria, Germany
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