Portal:Telecommunication

Telecommunication, often used in its plural form or abbreviated as telecom, is the transmission of information over a distance using electronic means, typically through cables, radio waves, or other communication technologies. These means of transmission may be divided into communication channels for multiplexing, allowing for a single medium to transmit several concurrent communication sessions. 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 communications by Guglielmo 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, Philipp Reis, Elisha Gray 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...)

The Distant Early Warning Line, also known as the DEW Line or Early Warning Line, was a system of radar stations in the northern Arctic region of Canada, with additional stations along the north coast and Aleutian Islands of Alaska (see Project Stretchout and Project Bluegrass), in addition to the Faroe Islands, Greenland, and Iceland. It was set up to detect incoming bombers of the Soviet Union during the Cold War, and provide early warning of any sea-and-land invasion.

The DEW Line was the northernmost and most capable of three radar lines in Canada and Alaska. The first of these was the joint Canadian-United States Pinetree Line, which ran from Newfoundland to Vancouver Island just north of the Canada–United States border, but even while it was being built there were concerns that it would not provide enough warning time to launch an effective counterattack. The Mid-Canada Line (MCL) was proposed as an inexpensive solution using bistatic radar. This provided a "trip wire" warning located roughly at the 55th parallel, giving commanders ample warning time, but little information on the targets or their exact location. The MCL proved largely useless in practice, as the radar return of flocks of birds overwhelmed signals from aircraft. (Full article...)

List of selected articles

The following are images from various telecommunication-related articles on Wikipedia.

Image 1The 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)
Image 2The "Kerbango Internet Radio" was the first stand-alone product that let users listen to Internet radio without a computer. (from History of broadcasting)
Image 3The Philco Predicta, 1958. In the collection of The Children's Museum of Indianapolis (from History of television)
Image 4Elisha Gray, 1876, designed a telephone using a water microphone in Highland Park, Illinois. (from History of the telephone)
Image 5Oliver Lodge's 1894 lectures on Hertz demonstrated how to transmit and detect radio waves. (from History of radio)
Image 6Tihanyi' Radioskop patent (1926) was recognized as Document of Universal Significance by the UNESCO (from History of television)
Image 7Australian 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)
Image 8The 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)
Image 9The master telephone patent, 174465, granted to Bell, March 7, 1876 (from History of telecommunication)
Image 10A French Gower telephone of 1912 at the Musée des Arts et Métiers in Paris (from History of the telephone)
Image 11Family watching TV, 1958 (from History of television)
Image 12Early pioneers of radio science and technology in the United States including Charles Steinmetz, David Sarnoff, Irving Langmuir and Alfred Goldsmith in 1921, photographed next to the antenna feed wires of the New Brunswick Marconi Station, one of the first transatlantic radio links. Photo includes Albert Einstein as a visiting guest. (from History of radio)
Image 131917 wall telephone, open to show magneto and local battery (from History of the telephone)
Image 14Artist's conception: 21st-century videotelephony imagined in the early 20th century (1910) (from History of videotelephony)
Image 15Receiver schematic, c.1906 (from History of the telephone)
Image 16Actor 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)
Image 17Antonio Meucci, 1854, developed a voice-communication apparatus that several sources credit as the first telephone. (from History of the telephone)
Image 18Around 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)
Image 19The 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)
Image 20Replica of the telettrofono at Museo Nazionale Scienza e Tecnologia Leonardo da Vinci of Milan, Italy, invented by Antonio Meucci and credited by several sources as the first telephone. (from History of the telephone)
Image 21Donald Manson working as an employee of the Marconi Company (England, 1906) (from History of radio)
Image 22Reconstruction of Aeneas Tacticus' hydraulic telegraph (4th c. B.C.) in Kotsanas Museum of Ancient Greek Technology, Athens, Greece. (from History of telecommunication)
Image 23Right side view, housing removed, one of its printed circuit boards exposed (courtesy: Richard Diehl) (from History of videotelephony)
Image 24Broadcasting pioneer Frank Conrad in a 1921 portrait (from History of broadcasting)
Image 25Alexander Graham Bell was awarded the first U.S. patent for the invention of the telephone in 1876. (from History of the telephone)
Image 26The Australian Broadcasting Corporation logo, first introduced in 1975 and based on the Lissajous curve (from History of broadcasting)
Image 27Charles Logwood broadcasting at station 2XG, New York City, circa November, 1916 (from History of broadcasting)
Image 28Manfred von Ardenne in 1933 (from History of television)
Image 29The Regency TR-1, which used Texas Instruments' NPN transistors, was the world's first commercially produced transistor radio in 1954. Size: 3×5×1.25 inch (7.6×12.7×3.2 cm) (from History of radio)
Image 30Caricature of Sir John Reith, by Wooding (from History of broadcasting)
Image 31"Doc" Herrold is shown at the microphone of KQW, early 1920s. (from History of broadcasting)
Image 32An exposed view of the Picturephone's rear circuit board (courtesy: Richard Diehl) (from History of videotelephony)
Image 33Reginald Fessenden, the "father" of radio broadcasting in the US (from History of broadcasting)
Image 34DBS satellite dishes (from History of television)
Image 35A German rotary dial telephone, the W48 (from History of the telephone)
Image 36Reginald Fessenden (around 1906) (from History of radio)
Image 37Swedish Prime Minister Tage Erlander using an Ericsson videophone to speak with Lennart Hyland, a popular TV show host (1969) (from History of videotelephony)
Image 38The earliest photograph of a television picture, showing the face of Oliver Hutchinson in June 1926. The television picture was projected using Baird's television camera. (from History of television)
Image 39Ad for the beginning of experimental television broadcasting in New York City by RCA in 1939 (from History of television)
Image 40British Post Office engineers inspect Guglielmo Marconi's wireless telegraphy (radio) equipment in 1897. (from History of radio)
Image 41The 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)
Image 42Thomas Edison invented the carbon microphone which produced a strong telephone signal. (from History of the telephone)
Image 43The master telephone patent granted to Bell, 174465, March 7, 1876 (from History of the telephone)
Image 44AT&T magazine advertisement announcing commercial launch of Picturephone service. (from History of videotelephony)
Image 45Stock telegraph ticker machine by Thomas Edison (from History of telecommunication)
Image 46Apple iPhone smartphone (from History of the telephone)
Image 47Top of cellular telephone tower (from History of the telephone)
Image 48Baird in 1925 with his televisor equipment and dummies "James" and "Stooky Bill" (right) (from History of television)
Image 49In 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)
Image 501896 telephone (Sweden) (from History of the telephone)
Image 51Historical marker commemorating the first telephone central office in New York State (1878) (from History of the telephone)
Image 52Code of letters and symbols for Chappe telegraph (Rees's Cyclopaedia) (from History of telecommunication)
Image 53Emil 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)
Image 54
Bell prototype telephone stamp
Centennial Issue of 1976
(from History of the telephone)
Image 55An early Smart TV from 2012 running the discontinued Orsay platform (from History of television)
Image 56Tivadar Puskás proposed the telephone switchboard exchange in 1876. (from History of the telephone)
Image 57"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)
Image 58RCA 630-TS, the first mass-produced television set, which sold in 1946–1947 (from History of television)
Image 59The 1969 AT&T Mod II Picturephone, the result of decades long R&D at a cost of over $500M. (from History of telecommunication)
Image 60First television test broadcast transmitted by the NHK Broadcasting Technology Research Institute in May 1939 (from History of television)
Image 61Ferdinand Braun (from History of television)
Image 62AT&T Picturephone (Mod II) fully enclosed in its housing, control pad at bottom (courtesy: Richard Diehl) (from History of videotelephony)
Image 63The French Matra videophone (1970) (from History of videotelephony)
Image 64Private conversation, 1910 (from History of the telephone)
Image 65The 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)
Image 66The first mass-produced Czechoslovak TV-set Tesla 4001A (1953–57) (from History of television)
Image 67Naomi ("Joan") Melwit and Norman Banks at the 3KZ microphone, in the late 1930s (from History of broadcasting)
Image 68Lee DeForest broadcasting Columbia phonograph records on pioneering New York station 2XG, in 1916 (from History of broadcasting)
Image 69Heinrich Rudolf Hertz (1856–1894) proved the existence of electromagnetic radiation. (from History of radio)
Image 70A 19th century acoustic tin can or "lovers' telephone" (from History of the telephone)
Image 71Early experiment demonstrating refraction of microwaves by a paraffin lens by John Ambrose Fleming in 1897 (from History of radio)
Image 72Guglielmo Marconi (from History of broadcasting)
Image 73A replica of one of Claude Chappe's semaphore towers (optical telegraph) in Nalbach, Germany (from History of telecommunication)
Image 74Philipp Reis, 1861, constructed the first telephone, today called the Reis telephone. (from History of the telephone)
Image 75Ferdinand Braun (from History of broadcasting)
Image 76Reis's telephone around 1861, first device called telephone (from History of the telephone)
Image 77Philo Farnsworth in 1924 (from History of television)
Image 78Color bars used in a test pattern, sometimes used when no program material is available (from History of television)
Image 79Typical low-cost webcam used with many personal computers (from History of videotelephony)

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Charles Bourseul (28 April 1829 – 23 November 1912) was a pioneer in development of the "make and break" telephone about 20 years before Bell made a practical telephone. (Full article...)

List of selected biographies
Guglielmo Marconi Alexander Graham Bell Nikola Tesla Samuel Morse Thomas Edison Antonio Meucci Paul Gottlieb Nipkow Vladimir K. Zworykin John Logie Baird Philo Farnsworth Ronald Hugh Barker

... that in 1951, the University of Arizona radio bureau produced four different programs that aired on four different Tucson stations?
... that It Sticks Out Half a Mile is a radio sequel series to Dad's Army that follows three of the main characters in their attempts to renovate a seaside pier in post-war Britain?
... that ranchers in the community now known as Loybas Hill ran their own telephone company for 60 years?
... that the church that attempted to sell a Kansas radio station could not locate the money allegedly paid by the buyer?
... that New Haven, Connecticut, was home to the world's first commercial telephone exchange?
... that after Lew Dickey Sr. broke into the radio business by buying a station in West Virginia, his son would go on to own Cumulus Media?

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Telecommunications
History	Beacon Broadcasting Cable protection system Cable TV Communications satellite Computer network Data compression audio DCT image video Digital media Internet video online video platform social media streaming Drums Edholm's law Electrical telegraph Fax Heliographs Hydraulic telegraph Information Age Information revolution Internet Mass media Mobile phone Smartphone Optical telecommunication Optical telegraphy Pager Photophone Prepaid mobile phone Radio Radiotelephone Satellite communications Semaphore Semiconductor device MOSFET transistor Smoke signals Telecommunications history Telautograph Telegraphy Teleprinter (teletype) Telephone The Telephone Cases Television digital streaming Undersea telegraph line Videotelephony Whistled language Wireless revolution
Pioneers	Nasir Ahmed Edwin Howard Armstrong Mohamed M. Atalla John Logie Baird Paul Baran John Bardeen Alexander Graham Bell Emile Berliner Tim Berners-Lee Francis Blake (telephone) Jagadish Chandra Bose Charles Bourseul Walter Houser Brattain Vint Cerf Claude Chappe Yogen Dalal Donald Davies Amos Dolbear Thomas Edison Lee de Forest Philo Farnsworth Reginald Fessenden Elisha Gray Oliver Heaviside Robert Hooke Erna Schneider Hoover Harold Hopkins Gardiner Greene Hubbard Internet pioneers Bob Kahn Dawon Kahng Charles K. Kao Narinder Singh Kapany Hedy Lamarr Innocenzo Manzetti Guglielmo Marconi Robert Metcalfe Antonio Meucci Samuel Morse Jun-ichi Nishizawa Charles Grafton Page Radia Perlman Alexander Stepanovich Popov Tivadar Puskás Johann Philipp Reis Claude Shannon Almon Brown Strowger Henry Sutton Charles Sumner Tainter Nikola Tesla Camille Tissot Alfred Vail Thomas A. Watson Charles Wheatstone Vladimir K. Zworykin
Transmission media	Coaxial cable Fiber-optic communication optical fiber Free-space optical communication Molecular communication Radio waves wireless Transmission line data transmission circuit telecommunication circuit
Network topology and switching	Bandwidth Links Nodes terminal Network switching circuit packet Telephone exchange
Multiplexing	Space-division Frequency-division Time-division Polarization-division Orbital angular-momentum Code-division
Concepts	Communication protocol Computer network Data transmission Store and forward Telecommunications equipment
Types of network	Cellular network Ethernet ISDN LAN Mobile NGN Public Switched Telephone Radio Television Telex UUCP WAN Wireless network
Notable networks	ARPANET BITNET CYCLADES FidoNet Internet Internet2 JANET NPL network Usenet
Locations	Africa Americas North South Antarctica Asia Europe Oceania
Category Outline Commons

Telecommunications in Africa
Sovereign states	Algeria Angola Benin Botswana Burkina Faso Burundi Cameroon Cape Verde Central African Republic Chad Comoros Democratic Republic of the Congo Republic of the Congo Djibouti Egypt Equatorial Guinea Eritrea Eswatini Ethiopia Gabon The Gambia Ghana Guinea Guinea-Bissau Ivory Coast Kenya Lesotho Liberia Libya Madagascar Malawi Mali Mauritania Mauritius Morocco Mozambique Namibia Niger Nigeria Rwanda São Tomé and Príncipe Senegal Seychelles Sierra Leone Somalia South Africa South Sudan Sudan Tanzania Togo Tunisia Uganda Zambia Zimbabwe
States with limited recognition	Sahrawi Arab Democratic Republic Somaliland
Dependencies and other territories	Canary Islands / Ceuta / Melilla (Spain) Madeira (Portugal) Mayotte / Réunion (France) Saint Helena / Ascension Island / Tristan da Cunha (United Kingdom) Western Sahara

Telecommunications in Asia
Sovereign states	Afghanistan Armenia Azerbaijan Bahrain Bangladesh Bhutan Brunei Cambodia China Cyprus Egypt Georgia India Indonesia Iran Iraq Israel Japan Jordan Kazakhstan North Korea South Korea Kuwait Kyrgyzstan Laos Lebanon Malaysia Maldives Mongolia Myanmar Nepal Oman Pakistan Philippines Qatar Russia Saudi Arabia Singapore Sri Lanka Syria Tajikistan Thailand Timor-Leste (East Timor) Turkey Turkmenistan United Arab Emirates Uzbekistan Vietnam Yemen
States with limited recognition	Abkhazia Northern Cyprus Palestine South Ossetia Taiwan
Dependencies and other territories	British Indian Ocean Territory Christmas Island Cocos (Keeling) Islands Hong Kong Macau
Category Asia portal

Telecommunications in Europe
Sovereign states	Albania Andorra Armenia Austria Azerbaijan Belarus Belgium Bosnia and Herzegovina Bulgaria Croatia Cyprus Czech Republic Denmark Estonia Finland France Georgia Germany Greece Hungary Iceland Ireland Italy Kazakhstan Latvia Liechtenstein Lithuania Luxembourg Malta Moldova Monaco Montenegro Netherlands North Macedonia Norway Poland Portugal Romania Russia San Marino Serbia Slovakia Slovenia Spain Sweden Switzerland Turkey Ukraine United Kingdom Vatican City
States with limited recognition	Abkhazia Kosovo Northern Cyprus South Ossetia Transnistria
Dependencies and other entities	Åland Faroe Islands Gibraltar Guernsey Isle of Man Jersey Svalbard
Other entities	European Union

Telecommunications in North America
Sovereign states	Antigua and Barbuda Bahamas Barbados Belize Canada Costa Rica Cuba Dominica Dominican Republic El Salvador Grenada Guatemala Haiti Honduras Jamaica Mexico Nicaragua Panama Saint Kitts and Nevis Saint Lucia Saint Vincent and the Grenadines Trinidad and Tobago United States
Dependencies and other territories	Anguilla Aruba Bermuda Bonaire British Virgin Islands Cayman Islands Curaçao Greenland Guadeloupe Martinique Montserrat Puerto Rico Saint Barthélemy Saint Martin Saint Pierre and Miquelon Saba Sint Eustatius Sint Maarten Turks and Caicos Islands United States Virgin Islands

Telecommunications in Oceania
Sovereign states	Australia Federated States of Micronesia Fiji Indonesia Kiribati Marshall Islands Nauru New Zealand Palau Papua New Guinea Samoa Solomon Islands Timor-Leste Tonga Tuvalu Vanuatu
Associated states of New Zealand	Cook Islands Niue
Dependencies and other territories	American Samoa Christmas Island Cocos (Keeling) Islands Easter Island French Polynesia Guam Hawaii New Caledonia Norfolk Island Northern Mariana Islands Pitcairn Islands Tokelau Wallis and Futuna