history of telecommunication

{{See also| Hydraulic telegraph|Drums in communication|Heliograph}}

Early telecommunications included smoke signals and drums. Talking drums were used by natives in Africa, and smoke signals in North America and China. These systems were often used to do more than announce the presence of a military camp.{{cite web|url=http://www.inquiry.net/outdoor/native/sign/smoke-signal.htm|title=Native American Smoke Signals|first=William|last=Tomkins|year=2005}}{{cite web|url=http://www.si.umich.edu/chico/instrument/pages/tlkdrum_gnrl.html|title=Talking Drums|archive-url=https://web.archive.org/web/20060910172613/http://www.si.umich.edu/chico/instrument/pages/tlkdrum_gnrl.html|archive-date=2006-09-10|website=Instrument Encyclopedia, Cultural Heritage for Community Outreach|year=1996}}

In Rabbinical Judaism a signal was given by means of kerchiefs or flags at intervals along the way back to the high priest to indicate the goat "for Azazel" had been pushed from the cliff.

Homing pigeons have occasionally been used throughout history by different cultures. Pigeon post had Persian roots, and was later used by the Romans to aid their military.{{cite book |last=Levi |first=Wendell |title= The Pigeon|year= 1977|publisher= Levi Publishing Co, Inc|location= Sumter, S.C.|isbn=0853900132 }}

File:Hydraulic telegraph of Aeneas Tacticus in Kotsanas Museum of Ancient Greek Technology.jpg hydraulic telegraph (4th c. B.C.) in Kotsanas Museum of Ancient Greek Technology, Athens, Greece.]]

Greek hydraulic semaphore systems were used as early as the 4th century BC. The hydraulic semaphores, which worked with water filled vessels and visual signals, functioned as optical telegraphs. However, they could only utilize a very limited range of pre-determined messages, and as with all such optical telegraphs could only be deployed during good visibility conditions.{{cite web|last=Lahanas|first=Michael|url=http://www.mlahanas.de/Greeks/Communication.htm|title=Ancient Greek Communication Methods|archive-url=https://web.archive.org/web/20141102224501/http://www.mlahanas.de/Greeks/Communication.htm|archive-date=2014-11-02|website=Mlahanas.de|access-date=14 July 2009}}

File:Rees's Cyclopaedia Chappe telegraph.png

During the Middle Ages, chains of beacons were commonly used on hilltops as a means of relaying a signal. Beacon chains suffered the drawback that they could only pass a single bit of information, so the meaning of the message such as "the enemy has been sighted" had to be agreed upon in advance. One notable instance of their use was during the Spanish Armada, when a beacon chain relayed a signal from Plymouth to London that signaled the arrival of the Spanish warships.{{cite web|first=David|last=Ross|url=http://www.britainexpress.com/History/tudor/armada.htm|title=The Spanish Armada|website=Britain Express|date=October 2008}}

In 1774, the Swiss physicist Georges Lesage built an electrostatic telegraph consisting of a set of 24 conductive wires a few meters long connected to 24 elder balls suspended from a silk thread (each wire corresponds to a letter). The electrification of a wire by means of an electrostatic generator causes the corresponding elder ball to deflect and designate a letter to the operator located at the end of the line. The sequence of selected letters leads to the writing and transmission of a message.{{cite book |last1=Aitken |first1=Frédéric |last2=Foulc |first2=Jean-Numa |title=From deep sea to laboratory. 1 : the first explorations of the deep sea by H.M.S. Challenger (1872-1876) |date=2019 |publisher=ISTE-WILEY |location=London. |isbn=9781786303745 |url=http://www.iste.co.uk/book.php?id=1474 |chapter=Chap. 1}}

French engineer Claude Chappe began working on visual telegraphy in 1790, using pairs of "clocks" whose hands pointed at different symbols. These did not prove quite viable at long distances, and Chappe revised his model to use two sets of jointed wooden beams. Operators moved the beams using cranks and wires.{{cite book|last=Wenzlhuemer|title=Connecting the Nineteenth-Century World|year=2013|pages=63–64|isbn=9781139177986|doi=10.1017/CBO9781139177986}} He built his first telegraph line between Lille and Paris, followed by a line from Strasbourg to Paris. In 1794, a Swedish engineer, Abraham Edelcrantz built a quite different system from Stockholm to Drottningholm. As opposed to Chappe's system which involved pulleys rotating beams of wood, Edelcrantz's system relied only upon shutters and was therefore faster.{{cite web|url=http://chappe.ec-lyon.fr/|title=Les Télégraphes Chappe|archive-url=https://web.archive.org/web/20110317051817/http://chappe.ec-lyon.fr/|archive-date=2011-03-17|first=Cédrick|last=Chatenet|website=l'Ecole Centrale de Lyon|year=2003}}

However, semaphore as a communication system suffered from the need for skilled operators and expensive towers often at intervals of only ten to thirty kilometers (six to nineteen miles). As a result, the last commercial line was abandoned in 1880.{{cite web|url=http://www.itu.int/itudoc/gs/promo/tsb/88192.pdf|title=CCIT/ITU-T 50 Years of Excellence|website=International Telecommunication Union|year=2006}}

{{Main article|Electrical telegraph|Transatlantic telegraph cable}}

File:Edison Stock Telegraph Ticker.jpg ticker machine by Thomas Edison]]

Experiments on communication with electricity, initially unsuccessful, started in about 1726. Scientists including Laplace, Ampère, and Gauss were involved.

An early experiment in electrical telegraphy was an 'electrochemical' telegraph created by the German physician, anatomist and inventor Samuel Thomas von Sömmerring in 1809, based on an earlier, less robust design of 1804 by Spanish polymath and scientist Francisco Salva Campillo. Both their designs employed multiple wires (up to 35) in order to visually represent almost all Latin letters and numerals. Thus, messages could be conveyed electrically up to a few kilometers (in von Sömmerring's design), with each of the telegraph receiver's wires immersed in a separate glass tube of acid. An electric current was sequentially applied by the sender through the various wires representing each digit of a message; at the recipient's end the currents electrolysed the acid in the tubes in sequence, releasing streams of hydrogen bubbles next to each associated letter or numeral. The telegraph receiver's operator would visually observe the bubbles and could then record the transmitted message, albeit at a very low baud rate.{{cite web|last=Jones|first=R. Victor|url=http://people.seas.harvard.edu/~jones/cscie129/images/history/von_Soem.html|title=Samuel Thomas von Sömmerring's "Space Multiplexed" Electrochemical Telegraph (1808-10)|website=Harvard|access-date=2009-11-18|archive-date=2012-10-11|archive-url=https://web.archive.org/web/20121011042334/http://people.seas.harvard.edu/~jones/cscie129/images/history/von_Soem.html|url-status=dead}}

{{cite book|url=https://books.google.com/books?id=Oxc7AAAAMAAJ&q=Semaphore+to+Satellite,Published+by+the+International+Telecommunication+Union,+Geneva+1965|title=Semaphore to Satellite|publisher=International Telecommunication Union|location=Geneva|year=1965}} The principal disadvantage to the system was its prohibitive cost, due to having to manufacture and string-up the multiple wire circuits it employed, as opposed to the single wire (with ground return) used by later telegraphs.

The first working telegraph was built by Francis Ronalds in 1816 and used static electricity.{{Cite book|title=Sir Francis Ronalds: Father of the Electric Telegraph|last=Ronalds|first=B.F.|publisher=Imperial College Press|year=2016|isbn=978-1-78326-917-4|location=London}}

Charles Wheatstone and William Fothergill Cooke patented a five-needle, six-wire system, which entered commercial use in 1838.{{cite web|url=http://www.du.edu/~jcalvert/tel/morse/morse.htm|title=The Hindot Electromagnetic Telegraph|archive-url=https://web.archive.org/web/20070804113714/http://www.du.edu/~jcalvert/tel/morse/morse.htm|archive-date=2007-08-04|first=J. B.|last=Calvert|date=19 May 2004}} It used the deflection of needles to represent messages and started operating over twenty-one kilometres (thirteen miles) of the Great Western Railway on 9 April 1839. Both Wheatstone and Cooke viewed their device as "an improvement to the [existing] electromagnetic telegraph" not as a new device.

On the other side of the Atlantic Ocean, Samuel Morse developed a version of the electrical telegraph which he demonstrated on 2 September 1837. Alfred Vail saw this demonstration and joined Morse to develop the register—a telegraph terminal that integrated a logging device for recording messages to paper tape. This was demonstrated successfully over three miles (five kilometres) on 6 January 1838 and eventually over forty miles (sixty-four kilometres) between Washington, D.C., and Baltimore on 24 May 1844. The patented invention proved lucrative and by 1851 telegraph lines in the United States spanned over {{convert|20,000|mi|km|abbr=off}}.{{cite web|url=http://www.du.edu/~jcalvert/tel/morse/morse.htm|title=The Electromagnetic Telegraph|archive-url=https://web.archive.org/web/20070804113714/http://www.du.edu/~jcalvert/tel/morse/morse.htm|archive-date=2007-08-04|first=J. B.|last=Calvert|date=April 2000}} Morse's most important technical contribution to this telegraph was the simple and highly efficient Morse Code, co-developed with Vail, which was an important advance over Wheatstone's more complicated and expensive system, and required just two wires. The communications efficiency of the Morse Code preceded that of the Huffman code in digital communications by over 100 years, but Morse and Vail developed the code purely empirically, with shorter codes for more frequent letters.

The submarine cable across the English Channel, wire coated in gutta percha, was laid in 1851.{{cite book|last=Wenzlhuemer|title=Connecting the Nineteenth-Century World|year=2013|page=74|isbn=9781139177986|doi=10.1017/CBO9781139177986}} Transatlantic cables installed in 1857 and 1858 only operated for a few days or weeks (carried messages of greeting back and forth between James Buchanan and Queen Victoria) before they failed.{{cite web|url=http://www.sil.si.edu/digitalcollections/hst/atlantic-cable/|title=The Atlantic Cable|first=Bern|last=Dibner|website=Burndy Library|year=1959}} The project to lay a replacement line was delayed for five years by the American Civil War. The first successful transatlantic telegraph cable was completed on 27 July 1866, allowing continuous transatlantic telecommunication for the first time.

{{Main article|Invention of the telephone|History of the telephone}}

File:USPTO Telephone Patent No. 174465.jpg

The electric telephone was invented in the 1870s, based on earlier work with harmonic (multi-signal) telegraphs. The first commercial telephone services were set up in 1878 and 1879 on both sides of the Atlantic in the cities of New Haven, Connecticut in the US and London, England in the UK. Alexander Graham Bell held the master patent for the telephone that was needed for such services in both countries.{{cite book | last=Brown|first=Travis | title=Historical first patents: the first United States patent for many everyday things | publisher=Scarecrow Press | location=University of Michigan | year=1994 | edition=illustrated | pages=[https://archive.org/details/historicalfirstp0000brow/page/179 179] | isbn=978-0-8108-2898-8 | url=https://archive.org/details/historicalfirstp0000brow| url-access=registration}} All other patents for electric telephone devices and features flowed from this master patent. Credit for the invention of the electric telephone has been frequently disputed, and new controversies over the issue have arisen from time-to-time. As with other great inventions such as radio, television, the light bulb, and the digital computer, there were several inventors who did pioneering experimental work on voice transmission over a wire, who then improved on each other's ideas. However, the key innovators were Alexander Graham Bell and Gardiner Greene Hubbard, who created the first telephone company, the Bell Telephone Company in the United States, which later evolved into American Telephone & Telegraph (AT&T), at times the world's largest phone company.

Telephone technology grew quickly after the first commercial services emerged, with inter-city lines being built and telephone exchanges in every major city of the United States by the mid-1880s.{{cite web|url=http://www.connected-earth.com/Galleries/Telecommunicationsage/Thetelephone/index.htm|title=Connected Earth: The telephone|website=BT|year=2006|access-date=2006-09-17|archive-date=2006-08-22|archive-url=https://web.archive.org/web/20060822104544/http://www.connected-earth.com/Galleries/Telecommunicationsage/Thetelephone/index.htm|url-status=dead}}{{cite web|url=http://www.att.com/history/milestones.html|title=History of AT&T|year=2006|access-date=2006-09-17|archive-date=2008-09-06|archive-url=https://web.archive.org/web/20080906003711/http://www.att.com/history/milestones.html|url-status=dead}}{{cite journal |last=Page |first=Arthur W. |date=January 1906 |title=Communication By Wire And 'Wireless': The Wonders of Telegraph and Telephone |journal=The World's Work: A History of Our Time |volume=XIII |pages=8408–8422 |url=https://books.google.com/books?id=3IfNAAAAMAAJ&pg=PA8408|access-date=2009-07-10 }} The first transcontinental telephone call occurred on January 25, 1915. Despite this, transatlantic voice communication remained impossible for customers until January 7, 1927, when a connection was established using radio.{{Citation|website=History |title=First Transatlantic Telephone Call|url=https://www.history.com/topics/inventions/first-transatlantic-telephone-call-video|language=en|access-date=2019-03-22}} However no cable connection existed until TAT-1 was inaugurated on September 25, 1956, providing 36 telephone circuits.{{cite web|url=http://www.atlantic-cable.com/Cables/CableTimeLine/index1951.htm|title=History of the Atlantic Cable & Submarine Telegraphy|first=Bill|last=Glover|year=2006}}

In 1880, Bell and co-inventor Charles Sumner Tainter conducted the world's first wireless telephone call via modulated lightbeams projected by photophones. The scientific principles of their invention would not be utilized for several decades, when they were first deployed in military and fiber-optic communications.

The first transatlantic telephone cable (which incorporated hundreds of electronic amplifiers) was not operational until 1956, only six years before the first commercial telecommunications satellite, Telstar, was launched into space.{{cite book|first=Arthur C.|last=Clarke|url=https://books.google.com/books?id=L2UNAQAAIAAJ|title=Voice Across the Sea|publisher=Harper & Brothers|location=New York City|year=1958|isbn=9780860020684}}

{{Main article|History of radio|History of television|History of broadcasting}}

Over several years starting in 1894, the Italian inventor Guglielmo Marconi worked on adapting the newly discovered phenomenon of radio waves to telecommunication, building the first wireless telegraphy system using them.{{cite book|url=https://books.google.com/books?id=WKuG-VIwID8C&q=British+High+Court+upheld+patent+7777&pg=PA161|title=Icons of invention: the makers of the modern world from Gutenberg to Gates|publisher=ABC-CLIO|year=2009|isbn=9780313347436|access-date=August 11, 2011}} In December 1901, he established wireless communication between St. John's, Newfoundland and Poldhu, Cornwall (England), earning him a Nobel Prize in Physics (which he shared with Karl Braun) in 1909.{{cite web|url=http://www.teslasociety.com/biography.htm|title=Tesla Biography|first=Ljubo|last=Vujovic|website=Tesla Memorial Society of New York|year=1998}} In 1900, Reginald Fessenden was able to wirelessly transmit a human voice.

Millimetre wave communication was first investigated by Bengali physicist Jagadish Chandra Bose during 1894{{ndash}}1896, when he reached an extremely high frequency of up to 60{{nbsp}}GHz in his experiments.{{cite web |title=Milestones: First Millimeter-wave Communication Experiments by J.C. Bose, 1894-96 |url=https://ethw.org/Milestones:First_Millimeter-wave_Communication_Experiments_by_J.C._Bose,_1894-96 |website=List of IEEE milestones |publisher=Institute of Electrical and Electronics Engineers |access-date=1 October 2019}} He also introduced the use of semiconductor junctions to detect radio waves,{{cite book | last = Emerson | first = D. T. | title = 1997 IEEE MTT-S International Microwave Symposium Digest | chapter = The work of Jagadis Chandra Bose: 100 years of mm-wave research | journal = IEEE Transactions on Microwave Theory and Research | volume = 45 | issue = 12 | pages = 2267–2273 | year = 1997 | chapter-url = https://books.google.com/books?id=09Zsv97IH1MC&pg=PA88 | doi = 10.1109/MWSYM.1997.602853 | isbn = 9780986488511|bibcode = 1997imsd.conf..553E | s2cid = 9039614 }} when he patented the radio crystal detector in 1901.{{cite web |title=Timeline |url=https://www.computerhistory.org/siliconengine/timeline/ |website=The Silicon Engine |publisher=Computer History Museum |access-date=22 August 2019}}{{cite web |title=1901: Semiconductor Rectifiers Patented as "Cat's Whisker" Detectors |url=https://www.computerhistory.org/siliconengine/semiconductor-rectifiers-patented-as-cats-whisker-detectors/ |website=The Silicon Engine |publisher=Computer History Museum |access-date=23 August 2019}}

In 1924, Japanese engineer Kenjiro Takayanagi began a research program on electronic television. In 1925, he demonstrated a CRT television with thermal electron emission.{{cite web|url=http://www.ieeeghn.org/wiki/index.php/Milestones:Development_of_Electronic_Television,_1924-1941|title=Milestones:Development of Electronic Television, 1924-1941|access-date=December 11, 2015}} In 1926, he demonstrated a CRT television with 40-line resolution,{{cite web|url=http://www.nhk.or.jp/strl/aboutstrl/evolution-of-tv-en/p05/|archive-url=https://web.archive.org/web/20160101180643/http://www.nhk.or.jp/strl/aboutstrl/evolution-of-tv-en/p05/|archive-date=2016-01-01|title=Kenjiro Takayanagi: The Father of Japanese Television|website=NHK (Japan Broadcasting Corporation)|year=2002|access-date=2009-05-23}} the first working example of a fully electronic television receiver. In 1927, he increased the television resolution to 100 lines, which was unrivaled until 1931.{{cite book|url=https://books.google.com/books?id=wQhlFaxDwrsC&pg=PA220|title=High Above: The untold story of Astra, Europe's leading satellite company|date=28 August 2011|page=220|publisher=Springer Science+Business Media|isbn=9783642120091}} In 1928, he was the first to transmit human faces in half-tones on television, influencing the later work of Vladimir K. Zworykin.{{cite book|first=Albert|last=Abramson|title=Zworykin, Pioneer of Television|publisher=University of Illinois Press|year=1995|page=231|isbn=0-252-02104-5}}

On March 25, 1925, Scottish inventor John Logie Baird publicly demonstrated the transmission of moving silhouette pictures at the London department store Selfridge's. Baird's system relied upon the fast-rotating Nipkow disk, and thus it became known as the mechanical television. In October 1925, Baird was successful in obtaining moving pictures with halftone shades, which were by most accounts the first true television pictures.{{cite web|url=http://www.bairdtelevision.com|title=The Baird Television Website}} This led to a public demonstration of the improved device on 26 January 1926 again at Selfridges. His invention formed the basis of semi-experimental broadcasts done by the British Broadcasting Corporation beginning September 30, 1929.{{cite web|url=http://www.mztv.com/newframe.asp?content=http://www.mztv.com/pioneers.html|title=The Pioneers|archive-url=https://web.archive.org/web/20130514070220/http://www.mztv.com/newframe.asp?content=http%3A%2F%2Fwww.mztv.com%2Fpioneers.html|archive-date=2013-05-14|website=MZTV Museum of Television|year=2006}}

For most of the twentieth century televisions used the cathode ray tube (CRT) invented by Karl Braun. Such a television was produced by Philo Farnsworth, who demonstrated crude silhouette images to his family in Idaho on September 7, 1927.{{cite magazine|url=http://www.time.com/time/magazine/article/0,9171,990620,00.html|archive-url=https://web.archive.org/web/20070714040220/http://www.time.com/time/magazine/article/0,9171,990620,00.html|archive-date=2007-07-14|title=Philo Farnsworth|first=Neil|last=Postman|magazine=Time|date=29 March 1999}} Farnsworth's device would compete with the concurrent work of Kalman Tihanyi and Vladimir Zworykin. Though the execution of the device was not yet what everyone hoped it could be, it earned Farnsworth a small production company. In 1934, he gave the first public demonstration of the television at Philadelphia's Franklin Institute and opened his own broadcasting station.{{cite journal|last=Karwatka|first=D|year=1996|title=Philo Farnsworth--television pioneer|journal=Tech Directions|volume=56|issue=4|page=7}} Zworykin's camera, based on Tihanyi's Radioskop, which later would be known as the Iconoscope, had the backing of the influential Radio Corporation of America (RCA). In the United States, court action between Farnsworth and RCA would resolve in Farnsworth's favour.{{cite magazine|url=http://www.time.com/time/magazine/article/0,9171,990620,00.html|archive-url=https://web.archive.org/web/20070714040220/http://www.time.com/time/magazine/article/0,9171,990620,00.html|archive-date=2007-07-14|title=Philo Farnsworth|first=Neil|last=Postman|magazine=Time |date=29 March 1999}} John Logie Baird switched from mechanical television and became a pioneer of colour television using cathode-ray tubes.

After mid-century the spread of coaxial cable and microwave radio relay allowed television networks to spread across even large countries.

The modern period of telecommunication history from 1950 onwards is referred to as the semiconductor era, due to the wide adoption of semiconductor devices in telecommunication technology. The development of transistor technology and the semiconductor industry enabled significant advances in telecommunication technology, led to the price of telecommunications services declining significantly, and led to a transition away from state-owned narrowband circuit-switched networks to private broadband packet-switched networks. In turn, this led to a significant increase in the total number of telephone subscribers, reaching nearly 1{{nbsp}}billion users worldwide by the end of the 20th century.{{cite book |last1=Huurdeman |first1=Anton A. |title=The Worldwide History of Telecommunications |date=2003 |publisher=John Wiley & Sons |isbn=9780471205050 |pages=363–8 |url=https://books.google.com/books?id=SnjGRDVIUL4C&pg=PA363}}

The development of metal–oxide–semiconductor (MOS) large-scale integration (LSI) technology, information theory and cellular networking led to the development of affordable mobile communications. There was a rapid growth of the telecommunications industry towards the end of the 20th century, primarily due to the introduction of digital signal processing in wireless communications, driven by the development of low-cost, very large-scale integration (VLSI) RF CMOS (radio-frequency complementary MOS) technology.{{cite book |last1=Srivastava |first1=Viranjay M. |last2=Singh |first2=Ghanshyam |title=MOSFET Technologies for Double-Pole Four-Throw Radio-Frequency Switch |date=2013 |publisher=Springer Science & Business Media |isbn=9783319011653 |page=1 |url=https://books.google.com/books?id=fkO9BAAAQBAJ&pg=PA1}}

{{main article|History of videotelephony}}

File:AT&T Picturephone - upper RH oblique view.jpg, the result of decades long R&D at a cost of over $500M.]]

The development of videotelephony involved the historical development of several technologies which enabled the use of live video in addition to voice telecommunications. The concept of videotelephony was first popularized in the late 1870s in both the United States and Europe, although the basic sciences to permit its very earliest trials would take nearly a half century to be discovered. This was first embodied in the device which came to be known as the video telephone, or videophone, and it evolved from intensive research and experimentation in several telecommunication fields, notably electrical telegraphy, telephony, radio, and television.

The development of the crucial video technology first started in the latter half of the 1920s in the United Kingdom and the United States, spurred notably by John Logie Baird and AT&T's Bell Labs. This occurred in part, at least by AT&T, to serve as an adjunct supplementing the use of the telephone. A number of organizations believed that videotelephony would be superior to plain voice communications. However, video technology was to be deployed in analog television broadcasting long before it could become practical—or popular—for videophones.

Videotelephony developed in parallel with conventional voice telephone systems from the mid-to-late 20th century. Only in the late 20th century with the advent of powerful video codecs and high-speed broadband did it become a practical technology for regular use. With the rapid improvements and popularity of the Internet, it became widespread through the use of videoconferencing and webcams, which frequently utilize Internet telephony, and in business, where telepresence technology has helped reduce the need to travel.

Practical digital videotelephony was only made possible with advances in video compression, due to the impractically high bandwidth requirements of uncompressed video. To achieve Video Graphics Array (VGA) quality video (480p resolution and 256 colors) with raw uncompressed video, it would require a bandwidth of over 92{{nbsp}}Mbps.{{cite book |last1=Belmudez |first1=Benjamin |title=Audiovisual Quality Assessment and Prediction for Videotelephony |date=2014 |publisher=Springer |isbn=9783319141664 |pages=11–13 |url=https://books.google.com/books?id=ULTzBQAAQBAJ&pg=PA13}}

{{Main article|Communications satellite|Satellite phone|Satellite radio|Satellite television|Satellite Internet access}}

The first U.S. satellite to relay communications was Project SCORE in 1958, which used a tape recorder to store and forward voice messages. It was used to send a Christmas greeting to the world from U.S. President Dwight D. Eisenhower. In 1960 NASA launched an Echo satellite; the {{convert|100|ft|m|adj=on}} aluminized PET film balloon served as a passive reflector for radio communications. Courier 1B, built by Philco, also launched in 1960, was the world's first active repeater satellite. Satellites these days are used for many applications such as GPS, television, internet and telephone.

Telstar was the first active, direct relay commercial communications satellite. Belonging to AT&T as part of a multi-national agreement between AT&T, Bell Telephone Laboratories, NASA, the British General Post Office, and the French National PTT (Post Office) to develop satellite communications, it was launched by NASA from Cape Canaveral on July 10, 1962, the first privately sponsored space launch. Relay 1 was launched on December 13, 1962, and became the first satellite to broadcast across the Pacific on November 22, 1963.{{cite web|url=https://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/19660009169_1966009169.pdf|title=Significant Achievements in Space Communications and Navigation, 1958-1964|year=1966|work=NASA-SP-93|publisher=NASA|pages=30–32|access-date=2009-10-31}}

The first and historically most important application for communication satellites was in intercontinental long-distance telephony. The fixed Public Switched Telephone Network relays telephone calls from land line telephones to an earth station, where they are then transmitted a receiving satellite dish via a geostationary satellite in Earth orbit. Improvements in submarine communications cables, through the use of fiber-optics, caused some decline in the use of satellites for fixed telephony in the late 20th century, but they still exclusively service remote islands such as Ascension Island, Saint Helena, Diego Garcia, and Easter Island, where no submarine cables are in service. There are also some continents and some regions of countries where landline telecommunications are rare to nonexistent, for example Antarctica, plus large regions of Australia, South America, Africa, Northern Canada, China, Russia and Greenland.

After commercial long-distance telephone service was established via communication satellites, a host of other commercial telecommunications were also adapted to similar satellites starting in 1979, including mobile satellite phones, satellite radio, satellite television and satellite Internet access. The earliest adaption for most such services occurred in the 1990s as the pricing for commercial satellite transponder channels continued to drop significantly.

Realization and demonstration, on October 29, 2001, of the first digital cinema transmission by satellite in EuropeFrance Télécom, Commission Supérieure Technique de l'Image et du Son, Communiqué de presse, Paris, October 29th, 2001.{{Cite web |url=http://www.passeursdimages.fr/IMG/pdf/projections13.pdf |title=«Numérique : le cinéma en mutation», Projections, 13, CNC, Paris, September 2004, p. 7. |access-date=2014-11-17 |archive-date=2016-05-15 |archive-url=http://arquivo.pt/wayback/20160515184731/http://www.passeursdimages.fr/IMG/pdf/projections13.pdf |url-status=dead }}{{cite book|url=https://books.google.com/books?id=JhLwPrW8pggC&q=olivier+bomsel+mines|first1=Olivier|last1=Bomsel|first2=Gilles|last2=Le Blanc|title=Dernier tango argentique. Le cinéma face à la numérisation|work=Ecole des Mines de Paris|year=2002|page=12|publisher=Presses des MINES |isbn=9782911762420}} of a feature film by Bernard Pauchon,{{cite web|url=http://www.authorstream.com/Presentation/Veronica-45205-france-telecom-DIGITAL-CINEMA-global-leaderin-professional-broadcastingand-Education-ppt-powerpoint/|first=Bernard|last=Pauchon|title=France Telecom and digital cinema|website=ShowEast|year=2001|page=10|access-date=2014-11-17|archive-date=2019-04-20|archive-url=https://web.archive.org/web/20190420072714/http://www.authorstream.com/Presentation/Veronica-45205-france-telecom-DIGITAL-CINEMA-global-leaderin-professional-broadcastingand-Education-ppt-powerpoint/|url-status=dead}} Alain Lorentz, Raymond Melwig{{cite book|url=https://books.google.com/books?id=drqODwAAQBAJ&q=Critical+Space+Infrastructures|first=Alexandru|last=Georgescu|title=Critical Space Infrastructures. Risk, Resilience and Complexity|publisher=Springer|year=2019|page=48|isbn=9783030126049}} and Philippe Binant.{{cite web|url=http://www.01net.com/article/181540.html|title=Première numérique pour le cinéma français|website=01net|year=2002|access-date=2014-11-17|archive-date=2021-04-23|archive-url=https://web.archive.org/web/20210423080946/https://www.01net.com/actualites/|url-status=dead}}

{{Main|Computer|Computer network|History of the Internet}}

On September 11, 1940, George Stibitz was able to transmit problems using teletype to his Complex Number Calculator in New York City and receive the computed results back at Dartmouth College in New Hampshire.{{cite web|url=http://www.kerryr.net/pioneers/stibitz.htm|title=George Stibitz|website=Kerry Redshaw|year=1996}} This configuration of a centralized computer or mainframe with remote dumb terminals remained popular throughout the 1950s. However, it was not until the 1960s that researchers started to investigate packet switching a technology that would allow chunks of data to be sent to different computers without first passing through a centralized mainframe. A four-node network emerged on December 5, 1969, between the University of California, Los Angeles, the Stanford Research Institute, the University of Utah and the University of California, Santa Barbara. This network would become ARPANET, which by 1981 would consist of 213 nodes.{{cite book | last = Hafner | first = Katie | title = Where Wizards Stay Up Late: The Origins Of The Internet | publisher = Simon & Schuster | year = 1998 | isbn = 0-684-83267-4 }} In June 1973, the first non-US node was added to the network belonging to Norway's NORSAR project. This was shortly followed by a node in London.{{cite web|url=http://www.norsar.no/NORSAR/history/internet.html|title=NORSAR and the Internet: Together since 1973|archive-url=https://web.archive.org/web/20050910005017/http://www.norsar.no/NORSAR/history/internet.html|archive-date=2005-09-10|website=NORSAR|year=2006}}

ARPANET's development centred on the Request for Comments process and on April 7, 1969, RFC 1 was published. This process is important because ARPANET would eventually merge with other networks to form the Internet and many of the protocols the Internet relies upon today were specified through this process. The first Transmission Control Protocol (TCP) specification, {{IETF RFC|675}} (Specification of Internet Transmission Control Program), was written by Vinton Cerf, Yogen Dalal, and Carl Sunshine, and published in December 1974. It coined the term "Internet" as a shorthand for internetworking.{{cite IETF |title=Specification of Internet Transmission Control Protocol |rfc=675 |last=Cerf |first=Vint |author-link=Vint Cerf |date=December 1974 |publisher=IETF}} In September 1981, RFC 791 introduced the Internet Protocol v4 (IPv4). This established the TCP/IP protocol, which much of the Internet relies upon today. The User Datagram Protocol (UDP), a more relaxed transport protocol that, unlike TCP, did not guarantee the orderly delivery of packets, was submitted on 28 August 1980 as RFC 768. An e-mail protocol, SMTP, was introduced in August 1982 by RFC 821 and HTTP a protocol that would make the hyperlinked Internet possible was introduced in May 1996 by RFC 1945.

However, not all important developments were made through the Request for Comments process. Two popular link protocols for local area networks (LANs) also appeared in the 1970s. A patent for the Token Ring protocol was filed by Olof Söderblom on October 29, 1974.{{cite patent |country=USA |number=4293948|status= |title=Data transmission system|pubdate= |gdate=October 6, 1981|fdate=October 29, 1974|pridate= |inventor=Olof Soderblom |invent1= |invent2= |assign1= |assign2= |class= |url=http://patft1.uspto.gov/netacgi/nph-Parser?Sect1=PTO2&Sect2=HITOFF&p=1&u=%2Fnetahtml%2FPTO%2Fsearch-bool.html&r=1&f=G&l=50&co1=AND&d=PTXT&s1=4293948.PN.&OS=PN/4293948&RS=PN/4293948}} And a paper on the Ethernet protocol was published by Robert Metcalfe and David Boggs in the July 1976 issue of Communications of the ACM.{{cite journal|title=Ethernet: Distributed Packet Switching for Local Computer Networks|first1=Robert M.|last1=Metcalfe|first2=David R.|last2=Boggs|journal=Communications of the ACM|pages=395–404|volume=19|issue=5|date=July 1976 | doi=10.1145/360248.360253 |s2cid=429216|doi-access=free}} The Ethernet protocol had been inspired by the ALOHAnet protocol which had been developed by electrical engineering researchers at the University of Hawaii.

Internet access became widespread late in the century, using the old telephone and television networks.

{{Main|Digital telephony}}

{{Further|Push-button telephone|Speech coding}}

MOS technology was initially overlooked by Bell because they did not find it practical for analog telephone applications.{{cite book |last1=Maloberti |first1=Franco |last2=Davies |first2=Anthony C. |chapter=History of Electronic Devices |title=A Short History of Circuits and Systems: From Green, Mobile, Pervasive Networking to Big Data Computing |date=2016 |publisher=IEEE Circuits and Systems Society |isbn=9788793609860 |pages=59-70 (65-7) |chapter-url=https://ieee-cas.org/sites/default/files/a_short_history_of_circuits_and_systems-_ebook-_web.pdf |access-date=2019-11-29 |archive-date=2021-09-30 |archive-url=https://web.archive.org/web/20210930151716/https://ieee-cas.org/sites/default/files/a_short_history_of_circuits_and_systems-_ebook-_web.pdf |url-status=dead }}{{cite book|last1=Allstot|first1=David J.|title=A Short History of Circuits and Systems: From Green, Mobile, Pervasive Networking to Big Data Computing|date=2016|publisher=IEEE Circuits and Systems Society|isbn=9788793609860|editor-last1=Maloberti|editor-first1=Franco|pages=105–110|chapter=Switched Capacitor Filters|editor-last2=Davies|editor-first2=Anthony C.|chapter-url=https://ieee-cas.org/sites/default/files/a_short_history_of_circuits_and_systems-_ebook-_web.pdf|access-date=2019-11-29|archive-date=2021-09-30|archive-url=https://web.archive.org/web/20210930151716/https://ieee-cas.org/sites/default/files/a_short_history_of_circuits_and_systems-_ebook-_web.pdf|url-status=dead}} MOS technology eventually became practical for telephone applications with the MOS mixed-signal integrated circuit, which combines analog and digital signal processing on a single chip, developed by former Bell engineer David A. Hodges with Paul R. Gray at UC Berkeley in the early 1970s. In 1974, Hodges and Gray worked with R.E. Suarez to develop MOS switched capacitor (SC) circuit technology, which they used to develop the digital-to-analog converter (DAC) chip, using MOSFETs and MOS capacitors for data conversion. This was followed by the analog-to-digital converter (ADC) chip, developed by Gray and J. McCreary in 1975.

MOS SC circuits led to the development of PCM codec-filter chips in the late 1970s.{{cite book |last1=Floyd |first1=Michael D. |last2=Hillman |first2=Garth D. |chapter=Pulse-Code Modulation Codec-Filters |title=The Communications Handbook |edition=2nd |date=8 October 2018 |orig-year=1st pub. 2000 |pages=26-1, 26-2, 26-3 |publisher=CRC Press |isbn=9781420041163 |chapter-url=https://books.google.com/books?id=Tokk5bZxB0MC&pg=SA26-PA1}} The silicon-gate CMOS (complementary MOS) PCM codec-filter chip, developed by Hodges and W.C. Black in 1980, has since been the industry standard for digital telephony. By the 1990s, telecommunication networks such as the public switched telephone network (PSTN) had been largely digitized with very-large-scale integration (VLSI) CMOS PCM codec-filters, widely used in electronic switching systems for telephone exchanges and data transmission applications.

{{Main|Wireless revolution}}

The wireless revolution began in the 1990s,{{cite book |last1=Golio |first1=Mike |last2=Golio |first2=Janet |title=RF and Microwave Passive and Active Technologies |date=2018 |publisher=CRC Press |isbn=9781420006728 |pages=ix, I–1 |url=https://books.google.com/books?id=MCj9jxSVQKIC&pg=PR9}}{{cite journal |last1=Rappaport |first1=T. S. |title=The wireless revolution |journal=IEEE Communications Magazine |date=November 1991 |volume=29 |issue=11 |pages=52–71 |doi=10.1109/35.109666 |s2cid=46573735 }}{{cite news |title=The wireless revolution |url=https://www.economist.com/leaders/1999/01/21/the-wireless-revolution |access-date=12 September 2019 |newspaper=The Economist |date=January 21, 1999}} with the advent of digital wireless networks leading to a social revolution, and a paradigm shift from wired to wireless technology,{{cite book |last1=Baliga |first1=B. Jayant |author1-link=B. Jayant Baliga |title=Silicon RF Power MOSFETS |date=2005 |publisher=World Scientific |isbn=9789812561213 |url=https://books.google.com/books?id=StJpDQAAQBAJ}} including the proliferation of commercial wireless technologies such as cell phones, mobile telephony, pagers, wireless computer networks, cellular networks, the wireless Internet, and laptop and handheld computers with wireless connections.{{cite web |last=Harvey |first=Fiona |author-link=Fiona Harvey |date=May 8, 2003 |title=The Wireless Revolution |url=https://www.britannica.com/topic/Wireless-Revolution-The-879379 |access-date=12 September 2019 |website=Encyclopedia Britannica}} The wireless revolution has been driven by advances in radio frequency (RF) and microwave engineering, and the transition from analog to digital RF technology.

Advances in metal–oxide–semiconductor field-effect transistor (MOSFET, or MOS transistor) technology, the key component of the RF technology that enables digital wireless networks, has been central to this revolution. Hitachi developed the vertical power MOSFET in 1969, but it was not until Ragle perfected the concept in 1976 that the power MOSFET became practical.{{cite book |last1=Oxner |first1=E. S. |title=Fet Technology and Application |date=1988 |publisher=CRC Press |isbn=9780824780500 |page=18 |url=https://books.google.com/books?id=0AE-0e-sAnsC&pg=PA18}} In 1977 Hitachi announce a planar type of DMOS that was practical for audio power output stages.{{cite book |last1=Duncan |first1=Ben |title=High Performance Audio Power Amplifiers |date=1996 |publisher=Elsevier |isbn=9780080508047 |pages=[https://archive.org/details/highperfomanceau0000dunc/page/177 177–8, 406] |url=https://archive.org/details/highperfomanceau0000dunc/page/177 }} RF CMOS (radio frequency CMOS) integrated circuit technology was later developed by Asad Abidi at UCLA in the late 1980s.{{cite journal |last1=O'Neill |first1=A. |title=Asad Abidi Recognized for Work in RF-CMOS |journal=IEEE Solid-State Circuits Society Newsletter |date=2008 |volume=13 |issue=1 |pages=57–58 |doi=10.1109/N-SSC.2008.4785694 |issn=1098-4232}} By the 1990s, RF CMOS integrated circuits were widely adopted as RF circuits, while discrete MOSFET (power MOSFET and LDMOS) devices were widely adopted as RF power amplifiers, which led to the development and proliferation of digital wireless networks.{{cite book |last1=Asif |first1=Saad |url=https://books.google.com/books?id=yg1mDwAAQBAJ&pg=PT128 |title=5G Mobile Communications: Concepts and Technologies |date=2018 |publisher=CRC Press |isbn=9780429881343 |pages=128–134}} Most of the essential elements of modern wireless networks are built from MOSFETs, including base station modules, routers, telecommunication circuits,{{cite book |last1=Colinge |first1=Jean-Pierre |last2=Greer |first2=James C.|title=Nanowire Transistors: Physics of Devices and Materials in One Dimension |date=2016 |publisher=Cambridge University Press |isbn=9781107052406 |page=2 |url=https://books.google.com/books?id=FvjUCwAAQBAJ&pg=PA2}} and radio transceivers. MOSFET scaling has led to rapidly increasing wireless bandwidth, which has been doubling every 18 months (as noted by Edholm's law).

• Prehistoric: Fires, beacons, smoke signals, communication drums, horns
• 6th century BCE: Mail
• 5th century BCE: Pigeon post
• 4th century BCE: Hydraulic semaphores
• 15th century CE: Maritime flag semaphores
• 1672: First experimental acoustic (mechanical) telephone
• 1790: Semaphore lines (optical telegraphs)
• 1867: Signal lamps
• 1877: Acoustic phonograph

• 1838: Electrical telegraph. See: Telegraph history
• 1830s: Beginning of attempts to develop "wireless telegraphy", systems using some form of ground, water, air or other media for conduction to eliminate the need for conducting wires.
• 1858: First trans-Atlantic telegraph cable
• 1876: Telephone. See: Invention of the telephone, History of the telephone, Timeline of the telephone
• 1880: Telephony via lightbeam photophones

• 1896: First practical wireless telegraphy systems based on Radio. See: History of radio.
• 1900: first television displayed only black and white images. Over the next decades, colour television were invented, showing images that were clearer and in full colour.
• 1914: First North American transcontinental telephone calling
• 1927: Television. See: History of television
• 1927: First commercial radio-telephone service, U.K.–U.S.
• 1930: First experimental videophones
• 1934: First commercial radio-telephone service, U.S.–Japan
• 1936: World's first public videophone network
• 1946: Limited capacity Mobile Telephone Service for automobiles
• 1947: First working transistor (see History of the transistor)
• 1950: Semiconductor era begins
• 1956: Transatlantic telephone cable
• 1962: Commercial telecommunications satellite
• 1964: Fiber optical telecommunications
• 1965: First North American public videophone network
• 1969: Computer networking
• 1973: First modern-era mobile (cellular) phone
• 1974: Internet (see History of Internet)
• 1979: INMARSAT ship-to-shore satellite communications
• 1981: First mobile (cellular) phone network
• 1982: SMTP email
• 1998: Mobile satellite hand-held phones
• 2003: VoIP Internet Telephony

{{further information|Timeline of communication technology|Timeline of the telephone|Timeline of radio|Timeline of the introduction of television in countries}}

{{commons category|History of telecommunications}}

• History of the Internet
• History of podcasting
• History of radio
• History of television
• History of the telephone
• History of videotelephony
• Information Age
• Information revolution
• Optical communication
• Outline of telecommunication

{{reflist|30em}}

• Wenzlhuemer, Roland. Connecting the Nineteenth-Century World: The Telegraph and Globalization. Cambridge University Press, 2013. {{ISBN|9781107025288}}

• Hilmes, Michele. Network Nations: A Transnational History of American and British Broadcasting (2011)
• John, Richard. Network Nation: Inventing American Telecommunications (Harvard U.P. 2010), emphasis on telephone
• Noll, Michael. The Evolution of Media, 2007, Rowman & Littlefield
• Poe, Marshall T. A History of Communications: Media and Society From the Evolution of Speech to the Internet (Cambridge University Press; 2011) 352 pages; Documents how successive forms of communication are embraced and, in turn, foment change in social institutions.
• Wheen, Andrew. DOT-DASH TO DOT.COM: How Modern Telecommunications Evolved from the Telegraph to the Internet (Springer, 2011)
• Wu, Tim. [https://books.google.com/books?id=nlnpJl7lNKUC The Master Switch: The Rise and Fall of Information Empires] (2010)
• Lundy, Bert. Telegraph, Telephone and Wireless: How Telecom Changed the World (2008)

• Katz, Randy H., [http://bnrg.eecs.berkeley.edu/~randy/Courses/CS39C.S97/index.html "History of Communications Infrastructures"] {{Webarchive|url=https://web.archive.org/web/20110930041641/http://bnrg.eecs.berkeley.edu/~randy/Courses/CS39C.S97/index.html |date=2011-09-30 }}, Electrical Engineering and Computer Science Department (EECS) Department, University of California, Berkeley.
• [http://www.itu.int International Telecommunication Union]
• [https://web.archive.org/web/20060924110621/http://aronsson.se/hist.html Aronsson's Telecom History Timeline]
• [http://www.thurn-taxis.com From the Thurn & Taxis to the Phone Book of the World - 730 years of Telecom History]
• [http://www.telcomhistory.org Telecommunications History Group Virtual Museum]
• [http://www.bayern-online.com/v2261/artikelliste.cfm?DID=203&Objectgroup_ID=4982 Telecommunications History Germany]
• [http://whitepages.fr/history Telecommunications History France]

{{Telecommunications}}

Telecommunications