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History of telecommunication

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History of telecommunication

History of telecommunication

The history of telecommunication began with the use of smoke signals and drums in Africa, Asia, and the Americas. In the 1790s, the first fixed semaphore…

The history of telecommunication commenced with the utilization of smoke signals and drums across Africa, Asia, and the Americas. By the 1790s, Europe saw the emergence of the first fixed semaphore systems. However, electrical telecommunication systems did not appear until the 1830s. This article delineates the historical development of telecommunication and the individuals who were instrumental in shaping these systems into their current forms. The history of telecommunication represents a crucial segment of the broader history of communication.

The history of telecommunication began with the use of smoke signals and drums in Africa, Asia, and the Americas. In the 1790s, the first fixed semaphore systems emerged in Europe. However, it was not until the 1830s that electrical telecommunication systems started to appear. This article details the history of telecommunication and the individuals who helped make telecommunication systems what they are today. The history of telecommunication is an important part of the larger history of communication.

Ancient Systems and Optical Telegraphy

Early telecommunication methods included smoke signals and drums. Talking drums were utilized by indigenous communities in Africa, while smoke signals were prevalent in North America and China. These systems frequently served functions beyond the mere announcement of a military encampment.

Within Rabbinical Judaism, a signal was conveyed using kerchiefs or flags positioned at intervals along the path leading back to the high priest. This signal indicated that the goat designated "for Azazel" had been cast from the cliff.

Homing pigeons have been sporadically utilized by diverse cultures throughout history. Pigeon post, originating in Persia, was later adopted by the Romans to support their military operations.

Greek hydraulic semaphore systems were operational as early as the fourth century BCE. These hydraulic semaphores, which functioned through water-filled vessels and visual signals, served as optical telegraphs. However, their utility was confined to a very limited repertoire of predetermined messages, and, like all optical telegraphs, their deployment was restricted to conditions of good visibility.

During the Middle Ages, chains of beacons were commonly employed on hilltops as a method for relaying signals. A significant limitation of these beacon chains was their capacity to transmit only a single bit of information, thus requiring the meaning of messages, such as "the enemy has been sighted," to be pre-arranged. A notable instance of their deployment occurred during the Spanish Armada, when a beacon chain relayed a signal from Plymouth to London, announcing the arrival of the Spanish warships.

In 1774, the Swiss physicist Georges Lesage developed an electrostatic telegraph. This apparatus consisted of 24 conductive wires, each several meters long, connected to 24 elder balls suspended by silk threads, with each wire corresponding to a specific letter. The electrification of a wire via an electrostatic generator caused its corresponding elder ball to deflect, thereby designating a letter to the operator at the line's terminus. The sequential selection of these letters enabled the formulation and transmission of a message.

In 1790, French engineer Claude Chappe commenced development of visual telegraphy, initially employing pairs of "clocks" with hands indicating various symbols. These early designs proved impractical over long distances, leading Chappe to revise his model to incorporate two sets of jointed wooden beams, which operators manipulated using cranks and wires. He constructed his first telegraph line between Lille and Paris, followed by another connecting Strasbourg to Paris. Concurrently, in 1794, Swedish engineer Abraham Edelcrantz developed a distinct system linking Stockholm to Drottningholm. Unlike Chappe's system, which involved pulleys rotating wooden beams, Edelcrantz's design relied exclusively on shutters, thereby achieving greater speed.

Nevertheless, semaphore as a communication system was constrained by the necessity for skilled operators and expensive towers, often positioned at intervals of only ten to thirty kilometers (six to nineteen miles). Consequently, the last commercial line was abandoned in 1880.

Electrical Telegraph

Early experiments concerning communication utilizing electricity, though initially unsuccessful, began around 1726. Prominent scientists such as Laplace, Ampère, and Gauss were involved in these investigations.

In 1809, Samuel Thomas von Sömmerring, a German physician, anatomist, and inventor, developed an 'electrochemical' telegraph, building upon a less robust 1804 design by the Spanish polymath and scientist Francisco Salva Campillo. Both designs utilized multiple wires, up to 35, to visually represent nearly all Latin letters and numerals. Von Sömmerring's design enabled electrical message transmission over several kilometers, with each receiver wire submerged in an individual glass tube containing acid. The sender sequentially applied an electric current through wires corresponding to each message character; at the receiver, these currents electrolyzed the acid in the tubes, generating hydrogen bubbles adjacent to the respective letters or numerals. Operators at the receiving end would visually interpret these bubbles to record the transmitted message, albeit at a very low baud rate. The primary drawback of this system was its prohibitive cost, stemming from the necessity of manufacturing and installing numerous wire circuits, in contrast to the single-wire (with ground return) configurations adopted by subsequent telegraphs.

Francis Ronalds constructed the first operational telegraph in 1816, which utilized static electricity.

In 1838, Charles Wheatstone and William Fothergill Cooke patented a five-needle, six-wire telegraphic system that subsequently entered commercial operation. This system conveyed messages through needle deflections and commenced operation along twenty-one kilometers (thirteen miles) of the Great Western Railway on April 9, 1839. Wheatstone and Cooke regarded their invention as an enhancement to the existing electromagnetic telegraph, rather than an entirely novel device.

Across the Atlantic, Samuel Morse developed his version of the electrical telegraph, which he first demonstrated on September 2, 1837. Alfred Vail witnessed this demonstration and subsequently collaborated with Morse to develop the register, a telegraph terminal incorporating a logging device for recording messages onto paper tape. Successful demonstrations occurred over three miles (five kilometers) on January 6, 1838, and later extended over forty miles (sixty-four kilometers) between Washington, D.C., and Baltimore by May 24, 1844. This patented invention proved highly profitable, leading to the expansion of telegraph lines across the United States to over 20,000 miles (32,000 kilometers) by 1851. Morse's most significant technical contribution was the simple and highly efficient Morse Code, co-developed with Vail, which represented a substantial improvement over Wheatstone's more complex and costly system, requiring only two wires. The communication efficiency of Morse Code predated that of the Huffman code in digital communications by more than a century; however, Morse and Vail developed their code empirically, assigning shorter codes to more frequently occurring letters.

In 1851, a submarine cable, insulated with gutta-percha, was laid across the English Channel. Transatlantic cables deployed in 1857 and 1858 functioned for only a few days or weeks, transmitting greetings between James Buchanan and Queen Victoria before experiencing failure. The subsequent project to install a replacement line was postponed for five years due to the American Civil War. On July 27, 1866, the first successful transatlantic telegraph cable was completed, inaugurating continuous transatlantic telecommunication.

Telephone

The electric telephone emerged in the 1870s, building upon prior advancements in harmonic (multi-signal) telegraphy. Initial commercial telephone services were established across the Atlantic in 1878 and 1879, specifically in New Haven, Connecticut (USA), and London, England (UK). Alexander Graham Bell secured the foundational patent for the telephone, which was essential for deploying these services in both nations. Subsequent patents for electric telephone apparatus and functionalities derived from this primary patent. The attribution for the electric telephone's invention has been consistently contested, with new disputes emerging periodically. Similar to other significant innovations like radio, television, the light bulb, and the digital computer, multiple inventors conducted foundational experimental work on voice transmission over a wire, progressively refining each other's concepts. Nevertheless, Alexander Graham Bell and Gardiner Greene Hubbard are recognized as the principal innovators, having co-founded the Bell Telephone Company in the United States, which subsequently transformed into American Telephone & Telegraph (AT&T), occasionally holding the distinction of being the world's largest telecommunications firm.

Following the introduction of initial commercial services, telephone technology rapidly advanced, leading to the construction of inter-city lines and the establishment of telephone exchanges in all major U.S. cities by the mid-1880s. The inaugural transcontinental telephone call took place on January 25, 1915. Despite this progress, transatlantic voice communication for consumers was not feasible until January 7, 1927, when a radio-based connection was successfully established. A direct cable connection, however, did not materialize until the TAT-1 system was activated on September 25, 1956, offering 36 telephone circuits.

In 1880, Alexander Graham Bell and his collaborator Charles Sumner Tainter achieved the world's first wireless telephone call, utilizing modulated lightbeams transmitted by photophones. The underlying scientific principles of their innovation remained unapplied for several decades, eventually finding their initial deployment in military and fiber-optic communication systems.

The inaugural transatlantic telephone cable, which integrated hundreds of electronic amplifiers, became operational only in 1956, merely six years prior to the launch of Telstar, the first commercial telecommunications satellite.

Radio and Television

Beginning in 1894, Italian inventor Guglielmo Marconi dedicated several years to adapting the recently discovered phenomenon of radio waves for telecommunication purposes, ultimately developing the first wireless telegraphy system. By December 1901, Marconi successfully established wireless communication between St. John's, Newfoundland, and Poldhu, Cornwall (England), an achievement that contributed to his Nobel Prize in Physics in 1909 (shared with Karl Braun). In 1900, Reginald Fessenden achieved the wireless transmission of a human voice.

Bengali physicist Jagadish Chandra Bose pioneered research into millimeter-wave communication between 1894 and 1896, achieving experimental frequencies as high as 60GHz. Furthermore, he introduced the application of semiconductor junctions for radio wave detection, patenting the radio crystal detector in 1901.

In 1924, Japanese engineer Kenjiro Takayanagi initiated a research program focused on electronic television. By 1925, he successfully demonstrated a cathode-ray tube (CRT) television employing thermal electron emission. The following year, 1926, he presented a CRT television with 40-line resolution, marking the first functional prototype of a fully electronic television receiver. In 1927, Takayanagi advanced television resolution to 100 lines, a benchmark that remained unsurpassed until 1931. His 1928 achievement of transmitting human faces in half-tones via television significantly influenced the subsequent work of Vladimir K. Zworykin.

On March 25, 1925, Scottish inventor John Logie Baird publicly showcased the transmission of moving silhouette images at Selfridge's department store in London. Baird's system, which utilized a rapidly rotating Nipkow disk, consequently became known as mechanical television. By October 1925, Baird successfully produced moving images incorporating halftone shades, widely considered the first genuine television pictures. This breakthrough culminated in another public demonstration of the enhanced apparatus at Selfridge's on January 26, 1926. His invention subsequently served as the foundation for semi-experimental broadcasts initiated by the British Broadcasting Corporation on September 30, 1929.

Throughout the majority of the twentieth century, televisions utilized the cathode-ray tube (CRT), an invention attributed to Karl Braun. Philo Farnsworth developed such a television, showcasing rudimentary silhouette images to his family in Idaho on September 7, 1927. Farnsworth's innovation contended with the simultaneous efforts of Kalman Tihanyi and Vladimir Zworykin. Despite its initial imperfections, Farnsworth's device led to the establishment of a modest production company. In 1934, he conducted the inaugural public demonstration of television at Philadelphia's Franklin Institute and subsequently launched his own broadcasting station. Concurrently, Zworykin's camera, derived from Tihanyi's Radioskop—later termed the Iconoscope—received support from the influential Radio Corporation of America (RCA). Legal proceedings in the United States between Farnsworth and RCA ultimately concluded in Farnsworth's favor. John Logie Baird transitioned from mechanical television to become a pioneer in color television, also employing cathode-ray tubes.

Following the mid-twentieth century, the proliferation of coaxial cable and microwave radio relay facilitated the expansion of television networks across extensive national territories.

Semiconductor Era

The contemporary epoch of telecommunication, commencing in 1950, is designated the semiconductor era, primarily owing to the extensive integration of semiconductor devices into telecommunication technologies. The evolution of transistor technology and the growth of the semiconductor industry spurred substantial progress in telecommunication, resulting in a notable reduction in service costs. This period also marked a fundamental shift from state-owned, narrowband, circuit-switched networks to privately operated, broadband, packet-switched networks. Consequently, the global number of telephone subscribers experienced a significant surge, approaching 1billion users by the close of the 20th century.

The convergence of metal–oxide–semiconductor (MOS) large-scale integration (LSI) technology, information theory, and cellular networking facilitated the emergence of economically viable mobile communication systems. The telecommunications industry experienced rapid expansion towards the end of the 20th century, largely attributable to the implementation of digital signal processing in wireless communications. This advancement was further propelled by the development of cost-effective very large-scale integration (VLSI) radio-frequency complementary MOS (RF CMOS) technology.

Videotelephony

The evolution of videotelephony necessitated the historical progression of multiple technologies that enabled the integration of live video with voice telecommunications. The notion of videotelephony gained initial prominence in the late 1870s across both the United States and Europe, though the fundamental scientific principles required for its earliest practical trials would not be established for nearly another half-century. This concept first materialized in the device known as the video telephone or videophone, emerging from extensive research and experimentation across various telecommunication domains, including electrical telegraphy, telephony, radio, and television.

The foundational video technology began its development in the latter half of the 1920s in both the United Kingdom and the United States, significantly driven by John Logie Baird and AT&T's Bell Labs. This initiative, particularly by AT&T, aimed to serve as an enhancement to existing telephone services. Numerous organizations anticipated that videotelephony would offer advantages over conventional voice communications. Nevertheless, video technology found its initial widespread application in analog television broadcasting, long before it achieved practicality or popularity for dedicated videophones.

Videotelephony evolved concurrently with traditional voice telephone systems throughout the mid-to-late 20th century. Its widespread practical application for routine use only materialized in the late 20th century, coinciding with the emergence of robust video codecs and high-speed broadband internet. The rapid advancements and increasing prevalence of the Internet subsequently facilitated its broad adoption through videoconferencing and webcams, often leveraging Internet telephony. In the business sector, telepresence technology has notably contributed to diminishing the necessity for physical travel.

The feasibility of digital videotelephony emerged only with advancements in video compression technologies, as uncompressed video demanded impractically high bandwidths. For instance, achieving Video Graphics Array (VGA) quality video, characterized by 480p resolution and 256 colors, would necessitate a raw uncompressed bandwidth exceeding 92Mbps.

Satellite Technology

Project SCORE, launched in 1958, marked the United States' inaugural satellite for communication relay, employing a tape recorder to store and transmit voice messages, including a global Christmas greeting from President Dwight D. Eisenhower. Subsequently, in 1960, NASA deployed the Echo satellite, a 100-foot (30 m) aluminized PET film balloon functioning as a passive radio communication reflector. The same year saw the launch of Courier 1B, developed by Philco, which became the world's first active repeater satellite. Contemporary satellites now support diverse applications, including global positioning systems (GPS), television broadcasting, internet connectivity, and telephony.

Telstar represented the pioneering active, direct relay commercial communications satellite. Owned by AT&T and developed under a multinational accord involving AT&T, Bell Telephone Laboratories, NASA, the British General Post Office, and the French National PTT, it was launched by NASA from Cape Canaveral on July 10, 1962, marking the first privately sponsored space launch. Following this, Relay 1 was launched on December 13, 1962, and subsequently achieved the distinction of being the first satellite to broadcast across the Pacific on November 22, 1963.

Historically, the paramount application for communication satellites involved intercontinental long-distance telephony. In this system, the fixed Public Switched Telephone Network routes calls from landline telephones to an earth station, from which they are then transmitted to a receiving satellite dish via a geostationary satellite in Earth orbit. While advancements in fiber-optic submarine communication cables led to a partial reduction in satellite usage for fixed telephony during the late 20th century, satellites continue to provide exclusive service to remote islands lacking submarine cable infrastructure, including Ascension Island, Saint Helena, Diego Garcia, and Easter Island. Furthermore, they remain essential for continents and regions where landline telecommunications are scarce or absent, such as Antarctica, as well as extensive areas within Australia, South America, Africa, Northern Canada, China, Russia, and Greenland.

Following the establishment of commercial long-distance telephone service through communication satellites, numerous other commercial telecommunication services began adapting to similar satellite platforms starting in 1979. These included mobile satellite phones, satellite radio, satellite television, and satellite Internet access. The most significant period of adaptation for these services occurred in the 1990s, driven by a substantial decline in the pricing of commercial satellite transponder channels.

On October 29, 2001, the first digital cinema transmission of a feature film by satellite in Europe was realized and demonstrated by Bernard Pauchon, Alain Lorentz, Raymond Melwig, and Philippe Binant.

Computer Networks and the Internet

On September 11, 1940, George Stibitz successfully transmitted computational problems via teletype to his Complex Number Calculator in New York City, receiving the processed results back at Dartmouth College in New Hampshire. This architecture, featuring a centralized computer or mainframe with remote terminals, maintained its prevalence throughout the 1950s. Nevertheless, it was not until the 1960s that researchers began exploring packet switching, a technology designed to enable data segments to be routed to various computers without initial passage through a central mainframe. A foundational four-node network materialized on December 5, 1969, connecting the University of California, Los Angeles; the Stanford Research Institute; the University of Utah; and the University of California, Santa Barbara. This network subsequently evolved into ARPANET, expanding to 213 nodes by 1981. In June 1973, the network incorporated its first non-U.S. node, associated with Norway's NORSAR project, soon followed by an additional node in London.

The development of ARPANET was primarily guided by the Request for Comments (RFC) process, which commenced with the publication of RFC 1 on April 7, 1969. This process proved crucial as ARPANET later integrated with other networks to form the Internet, and numerous foundational protocols for the modern Internet were defined through it. The initial specification for the Transmission Control Protocol (TCP), RFC 675 (Specification of Internet Transmission Control Program), authored by Vinton Cerf, Yogen Dalal, and Carl Sunshine, was released in December 1974. This document notably introduced the term "Internet" as an abbreviation for internetworking. Subsequently, RFC 791, published in September 1981, established Internet Protocol v4 (IPv4), thereby solidifying the TCP/IP protocol suite, which remains central to the Internet's operation today. The User Datagram Protocol (UDP), a less stringent transport protocol that does not assure ordered packet delivery, unlike TCP, was introduced as RFC 768 on August 28, 1980. Furthermore, the Simple Mail Transfer Protocol (SMTP) for email was specified in August 1982 by RFC 821, and HTTP, the protocol enabling the hyperlinked Internet, was introduced in May 1996 by RFC 1945.

Nevertheless, significant advancements also occurred outside the Request for Comments framework. The 1970s saw the emergence of two prominent link protocols for local area networks (LANs). Olof Söderblom filed a patent for the Token Ring protocol on October 29, 1974. Concurrently, Robert Metcalfe and David Boggs published a seminal paper on the Ethernet protocol in the July 1976 edition of Communications of the ACM. The Ethernet protocol itself drew inspiration from the ALOHAnet protocol, which had been developed by electrical engineering researchers at the University of Hawaii.

By the close of the century, Internet access achieved widespread adoption, leveraging existing telephone and television network infrastructures.

Digital Telephony Technology

Initially, Bell disregarded MOS technology, deeming it impractical for analog telephone applications. However, MOS technology later proved viable for telephony through the development of the MOS mixed-signal integrated circuit. This innovation, which integrates both analog and digital signal processing onto a single chip, was pioneered by former Bell engineer David A. Hodges in collaboration with Paul R. Gray at UC Berkeley during the early 1970s. In 1974, Hodges and Gray, alongside R.E. Suarez, advanced MOS switched capacitor (SC) circuit technology. This led to the creation of the digital-to-analog converter (DAC) chip, utilizing MOSFETs and MOS capacitors for data conversion. Subsequently, Gray and J. McCreary developed the analog-to-digital converter (ADC) chip in 1975.

The advancements in MOS SC circuits facilitated the creation of PCM codec-filter chips in the late 1970s. Notably, the silicon-gate CMOS (complementary MOS) PCM codec-filter chip, developed by Hodges and W.C. Black in 1980, subsequently became the industry benchmark for digital telephony. By the 1990s, telecommunication infrastructures, including the public switched telephone network (PSTN), had largely transitioned to digital operation, extensively employing very-large-scale integration (VLSI) CMOS PCM codec-filters in electronic switching systems for both telephone exchanges and data transmission.

The Wireless Revolution

The 1990s marked the onset of the wireless revolution, characterized by the emergence of digital wireless networks that precipitated a profound societal transformation and a fundamental shift from wired to wireless technological paradigms. This era witnessed the widespread adoption of commercial wireless innovations, including cellular phones, mobile telephony, pagers, wireless computer networks, cellular networks, the wireless Internet, and portable computing devices equipped with wireless connectivity. This revolution was propelled by significant progress in radio frequency (RF) and microwave engineering, coupled with the transition from analog to digital RF technologies.

The evolution of metal–oxide–semiconductor field-effect transistor (MOSFET, also known as MOS transistor) technology has been pivotal to this technological revolution, serving as the fundamental component of radio frequency (RF) technology that underpins digital wireless networks. Hitachi pioneered the vertical power MOSFET in 1969; however, its practical application was not realized until Ragle refined the concept in 1976. Subsequently, in 1977, Hitachi introduced a planar DMOS variant suitable for audio power output stages. The development of RF CMOS (radio frequency CMOS) integrated circuit technology by Asad Abidi at UCLA in the late 1980s further advanced the field. By the 1990s, RF CMOS integrated circuits were extensively utilized as RF circuits, while discrete MOSFET devices, including power MOSFETs and LDMOS, became prevalent as RF power amplifiers, thereby facilitating the expansion and widespread adoption of digital wireless networks. A majority of the critical components within contemporary wireless networks, such as base station modules, routers, telecommunication circuits, and radio transceivers, are constructed using MOSFETs. The continuous scaling of MOSFETs has resulted in a rapid increase in wireless bandwidth, consistently doubling approximately every 18 months, a phenomenon observed as Edholm's law.

Timeline

Non-Electrical Visual, Auditory, and Ancillary Communication Methods

Fundamental Electrical Signaling

Advanced Electrical and Electronic Signaling

References

Sources

Katz, Randy H., "History of Communications Infrastructures", Electrical Engineering and Computer Science Department (EECS), University of California, Berkeley.

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