Portal:Telecommunication

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Telecommunication, often used in its plural form or abbreviated as telecom, 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. Many transmission media have been used for telecommunications throughout history, from smoke signals, beacons, semaphore telegraphs, signal flags, and optical heliographstowires 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.

Early telecommunication networks used metal wires as the medium for transmitting signals. These networks were used for telegraphy and telephony for many decades. In the first decade of the 20th century, a revolution in wireless communication began with breakthroughs including those made in radio communicationsbyGuglielmo Marconi, who won the 1909 Nobel Prize in Physics. Other early pioneers in electrical and electronic telecommunications include co-inventors of the telegraph Charles Wheatstone and Samuel Morse, numerous inventors and developers of the telephone including Antonio Meucci and Alexander Graham Bell, inventors of radio Edwin Armstrong and Lee de Forest, as well as inventors of television like Vladimir K. Zworykin, John Logie Baird and Philo Farnsworth.

Since the 1960s, the proliferation of digital technologies has meant that voice communications have gradually been supplemented by data. The physical limitations of metallic media prompted the development of optical fibre. The Internet, a technology independent of any given medium, has provided global access to services for individual users and further reduced location and time limitations on communications. (Full article...)

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Integrated Services Digital Network (ISDN) is a set of communication standards for simultaneous digital transmission of voice, video, data, and other network services over the digitalised circuits of the public switched telephone network. Work on the standard began in 1980 at Bell Labs and was formally standardized in 1988 in the CCITT "Red Book". By the time the standard was released, newer networking systems with much greater speeds were available, and ISDN saw relatively little uptake in the wider market. One estimate suggests ISDN use peaked at a worldwide total of 25 million subscribers at a time when 1.3 billion analog lines were in use. ISDN has largely been replaced with digital subscriber line (DSL) systems of much higher performance.

General images

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  Image 1The "Kerbango Internet Radio" was the first stand-alone product that let users listen to Internet radio without a computer. (from History of broadcasting)
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  Image 2Oliver Lodge's 1894 lectures on Hertz demonstrated how to transmit and detect radio waves. (from History of radio)
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  Image 3In the 1920s, the United States government publication, "Construction and Operation of a Simple Homemade Radio Receiving Outfit", showed how almost any person handy with simple tools could a build an effective crystal radio receiver. (from History of radio)
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  Image 4Actor portraying Alexander Graham Bell in a 1932 silent film. Shows Bell's second telephone transmitter (microphone), invented 1876 and first displayed at the Centennial Exposition, Philadelphia. (from History of the telephone)
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  Image 5AT&T Picturephone (Mod II) fully enclosed in its housing, control pad at bottom (courtesy: Richard Diehl) (from History of videotelephony)
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  Image 6Philo Farnsworth in 1924 (from History of television)
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  Image 7The 1969 AT&T Mod II Picturephone, the result of decades long R&D at a cost of over $500M. (from History of telecommunication)
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  Image 8Alexander Graham Bell was awarded the first U.S. patent for the invention of the telephone in 1876. (from History of the telephone)
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  Image 9Old Receiver schematic, c.1906 (from History of the telephone)
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  Image 10Ferdinand Braun (from History of television)
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  Image 11Color bars used in a test pattern, sometimes used when no program material is available (from History of television)
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  Image 12Emil Voigt, founder of 2KY on behalf of the Labor Council of New South Wales. This photo was taken in earlier days when Voight was a prominent British athlete, and winner of the Gold Medal for the five mile race at the 1908 Summer Olympics in London. (from History of broadcasting)
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  Image 13The Marconi Company was formed in England in 1910. The photo shows a typical early scene, from 1906, with Marconi employee Donald Manson at right. (from History of broadcasting)
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  Image 14Donald Manson working as an employee of the Marconi Company (England, 1906) (from History of radio)
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  Image 15Heinrich Rudolf Hertz (1856–1894) proved the existence of electromagnetic radiation. (from History of radio)
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  Image 16Stock telegraph ticker machine by Thomas Edison (from History of telecommunication)
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  Image 17An exposed view of the Picturephone's rear circuit board (courtesy: Richard Diehl) (from History of videotelephony)
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  Image 18The master telephone patent granted to Bell, 174465, March 10, 1876 (from History of the telephone)
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  Image 19Antonio Meucci's telephone. (from History of the telephone)
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  Image 20Broadcasting pioneer Frank Conrad in a 1921 portrait (from History of broadcasting)
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  Image 21Around 1920, radio broadcasting started to get popular. The Brox Sisters, a popular singing group, gathered around the radio at the time. (from History of radio)
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  Image 22The first mass-produced Czechoslovak TV-set Tesla 4001A (1953–57) (from History of television)
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  Image 23Reginald Fessenden (around 1906) (from History of radio)
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  Image 24Baird in 1925 with his televisor equipment and dummies "James" and "Stooky Bill" (right) (from History of television)
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  Image 25Right side view, housing removed, one of its printed circuit boards exposed (courtesy: Richard Diehl) (from History of videotelephony)
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  Image 26Manfred von Ardenne in 1933 (from History of television)
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  Image 27Family watching TV, 1958 (from History of television)
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  Image 28A replica of one of Claude Chappe's semaphore towers (optical telegraph) in Nalbach, Germany (from History of telecommunication)
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  Image 29Guglielmo Marconi (from History of broadcasting)
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  Image 30A 19th century acoustic tin can or "lovers' telephone" (from History of the telephone)
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  Image 31The first commercial AM Audion vacuum tube radio transmitter, built in 1914 by Lee De Forest who invented the Audion (triode) in 1906 (from History of radio)
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  Image 32Swedish Prime Minister Tage Erlander using an Ericsson videophone to speak with Lennart Hyland, a popular TV show host (1969) (from History of videotelephony)
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  Image 33Lee DeForest broadcasting Columbia phonograph records on pioneering New York station 2XG, in 1916 (from History of broadcasting)
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  Image 34Charles Logwood broadcasting at station 2XG, New York City, circa November, 1916 (from History of broadcasting)
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  Image 35Caricature of Sir John Reith, by Wooding (from History of broadcasting)
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  Image 36A German rotary dial telephone, the W48 (from History of the telephone)
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  Image 37A French Gower telephone of 1912 at the Musée des Arts et Métiers in Paris (from History of the telephone)
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  Image 38The master telephone patent, 174465, granted to Bell, March 7, 1876 (from History of telecommunication)
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  Image 39The Nipkow disk. This schematic shows the circular paths traced by the holes, which may also be square for greater precision. The area of the disk outlined in black shows the region scanned. (from History of television)
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  Image 40The Australian Broadcasting Corporation logo, first introduced in 1975 and based on the Lissajous curve (from History of broadcasting)
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  Image 411896 Telephone (Sweden) (from History of the telephone)
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  Image 42The French Matra videophone (1970) (from History of videotelephony)
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  Image 43Elisha Gray, 1876, designed a telephone using a water microphone in Highland Park, Illinois. (from History of the telephone)
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  Image 44Thomas Edison invented the carbon microphone which produced a strong telephone signal. (from History of the telephone)
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  Image 45Tivadar Puskás proposed the telephone switchboard exchange in 1876. (from History of the telephone)
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  Image 46Naomi ("Joan") Melwit and Norman Banks at the 3KZ microphone, in the late 1930s (from History of broadcasting)
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  Image 471917 wall telephone, open to show magneto and local battery (from History of the telephone)
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  Image 48Ferdinand Braun (from History of broadcasting)
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  Image 49The British Broadcasting Corporation's landmark and iconic London headquarters, Broadcasting House, opened in 1932. At right is the 2005 eastern extension, the John Peel wing. (from History of broadcasting)
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  Image 50Typical low-cost webcam used with many personal computers (from History of videotelephony)
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  Image 51The Kyocera VP-210 Visual Phone was the first commercial mobile videophone. The Personal Handy-phone System (PHS) phone was introduced in Japan (1999). (from History of videotelephony)
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  Image 52Australian radio sets usually had the positions of radio stations marked on their dials. The illustration is a dial from a transistorised, mains-operated Calstan radio, circa 1960s. (Click image for a high resolution view, with readable callsigns.) (from History of broadcasting)
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  Image 53Antonio Meucci, 1854, constructed telephone-like devices. (from History of the telephone)
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  Image 54"Doc" Herrold is shown at the microphone of KQW, early 1920s. (from History of broadcasting)
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  Image 55DBS satellite dishes (from History of television)
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  Image 56An early Smart TV from 2012 running the discontinued Orsay platform (from History of television)
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  Image 57The Philco Predicta, 1958. In the collection of The Children's Museum of Indianapolis (from History of television)
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  Image 58Philipp Reis, 1861, constructed the first telephone, today called the Reis telephone. (from History of the telephone)
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  Image 59Private conversation, 1910 (from History of the telephone)
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  Image 60Reginald Fessenden, the "father" of radio broadcasting in the US (from History of broadcasting)
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  Image 61Ad for the beginning of experimental television broadcasting in New York City by RCA in 1939 (from History of television)
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  Image 62Artist's conception: 21st-century videotelephony imagined in the early 20th century (1910) (from History of videotelephony)
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  Image 63

  Bell prototype telephone stamp
  Centennial Issue of 1976

  (from History of the telephone)
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  Image 64Top of cellular telephone tower (from History of the telephone)
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  Image 65AT&T magazine advertisement announcing commercial launch of Picturephone service. (from History of videotelephony)
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  Image 66"Fiction becomes fact": Imaginary "Edison" combination videophone-television, conceptualized by George du Maurier and published in Punch magazine. The drawing also depicts then-contemporary speaking tubes, used by the parents in the foreground and their daughter on the viewing display (1878). (from History of videotelephony)
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  Image 67First television test broadcast transmitted by the NHK Broadcasting Technology Research Institute in May 1939 (from History of television)
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  Image 68Early experiment demonstrating refraction of microwaves by a paraffin lens by John Ambrose Fleming in 1897 (from History of radio)
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  Image 69Code of letters and symbols for Chappe telegraph (Rees's Cyclopaedia) (from History of telecommunication)
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  Image 70Historical marker commemorating the first telephone central office in New York State (1878) (from History of the telephone)
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  Image 71RCA 630-TS, the first mass-produced television set, which sold in 1946–1947 (from History of television)
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  Image 72The Regency TR-1, which used Texas Instruments' NPN transistors, was the world's first commercially produced transistor radio in 1954. (from History of radio)
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  Image 73Apple iPhone smartphone (from History of the telephone)
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  Image 74British Post Office engineers inspect Guglielmo Marconi's wireless telegraphy (radio) equipment in 1897. (from History of radio)

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Vladimir Zworykin, c. 1956

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