History of telecommunication

Last updated

A replica of one of Claude Chappe's semaphore towers (optical telegraph) in Nalbach, Germany OptischerTelegraf.jpg
A replica of one of Claude Chappe's semaphore towers (optical telegraph) in Nalbach, Germany

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.

Contents

Ancient systems and optical telegraphy

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. [1] [2]

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. [3]

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. [4]

Code of letters and symbols for Chappe telegraph (Rees's Cyclopaedia) Rees's Cyclopaedia Chappe telegraph.png
Code of letters and symbols for Chappe telegraph (Rees's Cyclopaedia)

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. [5]

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. [6]

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. [7] 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. [8]

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. [9]

Electrical telegraph

Stock telegraph ticker machine by Thomas Edison Edison Stock Telegraph Ticker.jpg
Stock telegraph 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. [10] 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. [10] 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. [11]

Charles Wheatstone and William Fothergill Cooke patented a five-needle, six-wire system, which entered commercial use in 1838. [12] 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 20,000 miles (32,000 kilometres). [13] 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. [14] 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. [15] 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.

Telephone

The master telephone patent, 174465, granted to Bell, March 7, 1876 USPTO Telephone Patent No. 174465.jpg
The master telephone patent, 174465, granted to Bell, March 7, 1876

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. [16] 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. [17] [18] [19] 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. [20] However no cable connection existed until TAT-1 was inaugurated on September 25, 1956, providing 36 telephone circuits. [21]

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. [22]

Radio and television

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. [23] 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. [24] 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 18941896, when he reached an extremely high frequency of up to 60  GHz in his experiments. [25] He also introduced the use of semiconductor junctions to detect radio waves, [26] when he patented the radio crystal detector in 1901. [27] [28]

In 1924, Japanese engineer Kenjiro Takayanagi began a research program on electronic television. In 1925, he demonstrated a CRT television with thermal electron emission. [29] In 1926, he demonstrated a CRT television with 40-line resolution, [30] the first working example of a fully electronic television receiver. [29] In 1927, he increased the television resolution to 100 lines, which was unrivaled until 1931. [31] In 1928, he was the first to transmit human faces in half-tones on television, influencing the later work of Vladimir K. Zworykin. [32]

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. [33] 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. [34]

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. [35] 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. [36] 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. [37] John Logie Baird switched from mechanical television and became a pioneer of colour television using cathode-ray tubes. [33]

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

Semiconductor era

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 billion users worldwide by the end of the 20th century. [38]

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. [39]

Videotelephony

The 1969 AT&T Mod II Picturephone, the result of decades long R&D at a cost of over $500M. AT&T Picturephone - upper RH oblique view.jpg
The 1969 AT&T Mod II Picturephone, 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  Mbps. [40]

Satellite

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 100-foot (30 m) 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. [41]

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 Europe [42] [43] [44] of a feature film by Bernard Pauchon, [45] Alain Lorentz, Raymond Melwig [46] and Philippe Binant. [47]

Computer networks and 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. [48] 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. [49] 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. [50]

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, 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. [51] 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://1.0%5B%5D 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. [52] 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 . [53] 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.

Digital telephone technology

MOS technology was initially overlooked by Bell because they did not find it practical for analog telephone applications. [54] [55] 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. [55] 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. [55]

MOS SC circuits led to the development of PCM codec-filter chips in the late 1970s. [55] [56] The silicon-gate CMOS (complementary MOS) PCM codec-filter chip, developed by Hodges and W.C. Black in 1980, [55] has since been the industry standard for digital telephony. [55] [56] 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. [56]

Wireless revolution

The wireless revolution began in the 1990s, [57] [58] [59] with the advent of digital wireless networks leading to a social revolution, and a paradigm shift from wired to wireless technology, [60] including the proliferation of commercial wireless technologies such as cell phones, mobile telephony, pagers, wireless computer networks, [57] cellular networks, the wireless Internet, and laptop and handheld computers with wireless connections. [61] The wireless revolution has been driven by advances in radio frequency (RF) and microwave engineering, [57] and the transition from analog to digital RF technology. [60] [61]

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. [60] 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. [62] In 1977 Hitachi announce a planar type of DMOS that was practical for audio power output stages. [63] RF CMOS (radio frequency CMOS) integrated circuit technology was later developed by Asad Abidi at UCLA in the late 1980s. [64] By the 1990s, RF CMOS integrated circuits were widely adopted as RF circuits, [64] 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. [60] [65] Most of the essential elements of modern wireless networks are built from MOSFETs, including base station modules, routers, [65] telecommunication circuits, [66] and radio transceivers. [64] MOSFET scaling has led to rapidly increasing wireless bandwidth, which has been doubling every 18 months (as noted by Edholm's law). [60]

Timeline

Visual, auditory and ancillary methods (non-electrical)

Basic electrical signals

Advanced electrical and electronic signals

See also

Related Research Articles

Communications in the United States include extensive industries and distribution networks in print and telecommunication. The primary telecom regulator of communications in the United States is the Federal Communications Commission.

<span class="mw-page-title-main">Wireless network</span> Computer network not fully connected by cables

A wireless network is a computer network that uses wireless data connections between network nodes. Wireless networking allows homes, telecommunications networks and business installations to avoid the costly process of introducing cables into a building, or as a connection between various equipment locations. Admin telecommunications networks are generally implemented and administered using radio communication. This implementation takes place at the physical level (layer) of the OSI model network structure.

<span class="mw-page-title-main">Multiplexing</span> Method of combining multiple signals into one signal over a shared medium

In telecommunications and computer networking, multiplexing is a method by which multiple analog or digital signals are combined into one signal over a shared medium. The aim is to share a scarce resource – a physical transmission medium. For example, in telecommunications, several telephone calls may be carried using one wire. Multiplexing originated in telegraphy in the 1870s, and is now widely applied in communications. In telephony, George Owen Squier is credited with the development of telephone carrier multiplexing in 1910.

Telephony is the field of technology involving the development, application, and deployment of telecommunication services for the purpose of electronic transmission of voice, fax, or data, between distant parties. The history of telephony is intimately linked to the invention and development of the telephone.

<span class="mw-page-title-main">Optical communication</span> Use of light to convey information

Optical communication, also known as optical telecommunication, is communication at a distance using light to carry information. It can be performed visually or by using electronic devices. The earliest basic forms of optical communication date back several millennia, while the earliest electrical device created to do so was the photophone, invented in 1880.

<span class="mw-page-title-main">Wireless</span> Transfer of information or power that does not require the use of physical wires

Wireless communication is the transfer of information (telecommunication) between two or more points without the use of an electrical conductor, optical fiber or other continuous guided medium for the transfer. The most common wireless technologies use radio waves. With radio waves, intended distances can be short, such as a few meters for Bluetooth or as far as millions of kilometers for deep-space radio communications. It encompasses various types of fixed, mobile, and portable applications, including two-way radios, cellular telephones, personal digital assistants (PDAs), and wireless networking. Other examples of applications of radio wireless technology include GPS units, garage door openers, wireless computer mouse, keyboards and headsets, headphones, radio receivers, satellite television, broadcast television and cordless telephones. Somewhat less common methods of achieving wireless communications involve other electromagnetic phenomena, such as light and magnetic or electric fields, or the use of sound.

<span class="mw-page-title-main">Telecommunications policy of the United States</span>

The telecommunications policy of the United States is a framework of law directed by government and the regulatory commissions, most notably the Federal Communications Commission (FCC). Two landmark acts prevail today, the Communications Act of 1934 and the Telecommunications Act of 1996. The latter was intended to revise the first act and specifically to foster competition in the telecommunications industry.

<span class="mw-page-title-main">Base station</span> Type of radio station

Base station is – according to the International Telecommunication Union's (ITU) Radio Regulations (RR) – a "land station in the land mobile service."

<span class="mw-page-title-main">Mixed-signal integrated circuit</span> Integrated circuit

A mixed-signal integrated circuit is any integrated circuit that has both analog circuits and digital circuits on a single semiconductor die. Their usage has grown dramatically with the increased use of cell phones, telecommunications, portable electronics, and automobiles with electronics and digital sensors.

<span class="mw-page-title-main">History of the telephone</span>

This history of the telephone chronicles the development of the electrical telephone, and includes a brief overview of its predecessors. The first telephone patent was granted to Alexander Graham Bell in 1869.

The following outline is provided as an overview of and topical guide to telecommunication:

<span class="mw-page-title-main">Telecommunications engineering</span> Subfield of electronics engineering

Telecommunications engineering is a subfield of electronics engineering which seeks to design and devise systems of communication at a distance. The work ranges from basic circuit design to strategic mass developments. A telecommunication engineer is responsible for designing and overseeing the installation of telecommunications equipment and facilities, such as complex electronic switching system, and other plain old telephone service facilities, optical fiber cabling, IP networks, and microwave transmission systems. Telecommunications engineering also overlaps with broadcast engineering.

Edholm's law, proposed by and named after Phil Edholm, refers to the observation that the three categories of telecommunication, namely wireless (mobile), nomadic and wired networks (fixed), are in lockstep and gradually converging. Edholm's law also holds that data rates for these telecommunications categories increase on similar exponential curves, with the slower rates trailing the faster ones by a predictable time lag. Edholm's law predicts that the bandwidth and data rates double every 18 months, which has proven to be true since the 1970s. The trend is evident in the cases of Internet, cellular (mobile), wireless LAN and wireless personal area networks.

In computing, bandwidth is the maximum rate of data transfer across a given path. Bandwidth may be characterized as network bandwidth, data bandwidth, or digital bandwidth.

Wired communication refers to the transmission of data over a wire-based communication technology. Wired communication is also known as wireline communication. Examples include telephone networks, cable television or internet access, and fiber-optic communication. Most wired networks use Ethernet cables to transfer data between connected PCs. Also waveguide (electromagnetism), used for high-power applications, is considered wired line. Local telephone networks often form the basis for wired communications and are used by both residential and business customers in the area. Many networks today rely on the use of fiber optic communication technology as a means of providing clear signaling for both inbound and outbound transmissions and are replacing copper wire transmission. Fiber optic technology is capable of accommodating far more signals than copper wiring while still maintaining the integrity of the signal over longer distances.

<span class="mw-page-title-main">Telecommunications equipment</span> Hardware used for telecommunication purposes

Telecommunications equipment is a type of hardware which is used for the purposes of telecommunications. Since the 1990s the boundary between telecoms equipment and IT hardware has become blurred as a result of the growth of the internet and its increasing role in the transfer of telecoms data.

<span class="mw-page-title-main">Telecommunications</span> Transmission of information electromagnetically

Telecommunication, often used in its plural form or abbreviated as telecom, is the transmission of information with an immediacy comparable to face-to-face communication. As such, slow communications technologies like postal mail and pneumatic tubes are excluded from the definition. Many transmission media have been used for telecommunications throughout history, from smoke signals, beacons, semaphore telegraphs, signal flags, and optical heliographs to wires and empty space made to carry electromagnetic signals. These paths of transmission may be divided into communication channels for multiplexing, allowing for a single medium to transmit several concurrent communication sessions. Several methods of long-distance communication before the modern era used sounds like coded drumbeats, the blowing of horns, and whistles. Long-distance technologies invented during the 20th and 21st centuries generally use electric power, and include the telegraph, telephone, television, and radio.

<span class="mw-page-title-main">Semaphore</span> Mechanical apparatus used to send messages

Semaphore is the use of an apparatus to create a visual signal transmitted over distance. A semaphore can be performed with devices including: fire, lights, flags, sunlight, and moving arms. Semaphores can be used for telegraphy when arranged in visually connected networks, or for traffic signalling such as in railway systems, or traffic lights in cities.

RF CMOS is a metal–oxide–semiconductor (MOS) integrated circuit (IC) technology that integrates radio-frequency (RF), analog and digital electronics on a mixed-signal CMOS RF circuit chip. It is widely used in modern wireless telecommunications, such as cellular networks, Bluetooth, Wi-Fi, GPS receivers, broadcasting, vehicular communication systems, and the radio transceivers in all modern mobile phones and wireless networking devices. RF CMOS technology was pioneered by Pakistani engineer Asad Ali Abidi at UCLA during the late 1980s to early 1990s, and helped bring about the wireless revolution with the introduction of digital signal processing in wireless communications. The development and design of RF CMOS devices was enabled by van der Ziel's FET RF noise model, which was published in the early 1960s and remained largely forgotten until the 1990s.

References

  1. Tomkins, William (2005). "Native American Smoke Signals".
  2. "Talking Drums". Instrument Encyclopedia, Cultural Heritage for Community Outreach. 1996. Archived from the original on 2006-09-10.
  3. Levi, Wendell (1977). The Pigeon. Sumter, S.C.: Levi Publishing Co, Inc. ISBN   0853900132.
  4. Lahanas, Michael. "Ancient Greek Communication Methods". Mlahanas.de. Archived from the original on 2014-11-02. Retrieved 14 July 2009.
  5. Ross, David (October 2008). "The Spanish Armada". Britain Express.
  6. Aitken, Frédéric; Foulc, Jean-Numa (2019). "Chap. 1". From deep sea to laboratory. 1 : the first explorations of the deep sea by H.M.S. Challenger (1872-1876). London.: ISTE-WILEY. ISBN   9781786303745.
  7. Wenzlhuemer (2013). Connecting the Nineteenth-Century World. pp. 63–64. doi:10.1017/CBO9781139177986. ISBN   9781139177986.
  8. Chatenet, Cédrick (2003). "Les Télégraphes Chappe". l'Ecole Centrale de Lyon. Archived from the original on 2011-03-17.
  9. "CCIT/ITU-T 50 Years of Excellence" (PDF). International Telecommunication Union. 2006.
  10. 1 2 Jones, R. Victor. "Samuel Thomas von Sömmerring's "Space Multiplexed" Electrochemical Telegraph (1808-10)". Harvard. Archived from the original on 2012-10-11. Retrieved 2009-11-18. Semaphore to Satellite. Geneva: International Telecommunication Union. 1965.
  11. Ronalds, B.F. (2016). Sir Francis Ronalds: Father of the Electric Telegraph. London: Imperial College Press. ISBN   978-1-78326-917-4.
  12. Calvert, J. B. (19 May 2004). "The Hindot Electromagnetic Telegraph". Archived from the original on 2007-08-04.
  13. Calvert, J. B. (April 2000). "The Electromagnetic Telegraph". Archived from the original on 2007-08-04.
  14. Wenzlhuemer (2013). Connecting the Nineteenth-Century World. p. 74. doi:10.1017/CBO9781139177986. ISBN   9781139177986.
  15. Dibner, Bern (1959). "The Atlantic Cable". Burndy Library.
  16. Brown, Travis (1994). Historical first patents: the first United States patent for many everyday things (illustrated ed.). University of Michigan: Scarecrow Press. pp.  179. ISBN   978-0-8108-2898-8.
  17. "Connected Earth: The telephone". BT. 2006. Archived from the original on 2006-08-22. Retrieved 2006-09-17.
  18. "History of AT&T". 2006. Archived from the original on 2008-09-06. Retrieved 2006-09-17.
  19. Page, Arthur W. (January 1906). "Communication By Wire And 'Wireless': The Wonders of Telegraph and Telephone". The World's Work: A History of Our Time . XIII: 8408–8422. Retrieved 2009-07-10.
  20. "First Transatlantic Telephone Call", History, retrieved 2019-03-22
  21. Glover, Bill (2006). "History of the Atlantic Cable & Submarine Telegraphy".
  22. Clarke, Arthur C. (1958). Voice Across the Sea. New York City: Harper & Brothers. ISBN   9780860020684.
  23. Icons of invention: the makers of the modern world from Gutenberg to Gates. ABC-CLIO. 2009. ISBN   9780313347436 . Retrieved August 11, 2011.
  24. Vujovic, Ljubo (1998). "Tesla Biography". Tesla Memorial Society of New York.
  25. "Milestones: First Millimeter-wave Communication Experiments by J.C. Bose, 1894-96". List of IEEE milestones . Institute of Electrical and Electronics Engineers . Retrieved 1 October 2019.
  26. Emerson, D. T. (1997). "The work of Jagadis Chandra Bose: 100 years of mm-wave research". 1997 IEEE MTT-S International Microwave Symposium Digest. Vol. 45. pp. 2267–2273. Bibcode:1997imsd.conf..553E. doi:10.1109/MWSYM.1997.602853. ISBN   9780986488511. S2CID   9039614.{{cite book}}: |journal= ignored (help)
  27. "Timeline". The Silicon Engine. Computer History Museum . Retrieved 22 August 2019.
  28. "1901: Semiconductor Rectifiers Patented as "Cat's Whisker" Detectors". The Silicon Engine. Computer History Museum . Retrieved 23 August 2019.
  29. 1 2 "Milestones:Development of Electronic Television, 1924-1941" . Retrieved December 11, 2015.
  30. "Kenjiro Takayanagi: The Father of Japanese Television". NHK (Japan Broadcasting Corporation). 2002. Archived from the original on 2016-01-01. Retrieved 2009-05-23.
  31. High Above: The untold story of Astra, Europe's leading satellite company. Springer Science+Business Media. 28 August 2011. p. 220. ISBN   9783642120091.
  32. Abramson, Albert (1995). Zworykin, Pioneer of Television. University of Illinois Press. p. 231. ISBN   0-252-02104-5.
  33. 1 2 "The Baird Television Website".
  34. "The Pioneers". MZTV Museum of Television. 2006. Archived from the original on 2013-05-14.
  35. Postman, Neil (29 March 1999). "Philo Farnsworth". Time . Archived from the original on 2007-07-14.
  36. Karwatka, D (1996). "Philo Farnsworth--television pioneer". Tech Directions. 56 (4): 7.
  37. Postman, Neil (29 March 1999). "Philo Farnsworth". Time. Archived from the original on 2007-07-14.
  38. Huurdeman, Anton A. (2003). The Worldwide History of Telecommunications. John Wiley & Sons. pp. 363–8. ISBN   9780471205050.
  39. Srivastava, Viranjay M.; Singh, Ghanshyam (2013). MOSFET Technologies for Double-Pole Four-Throw Radio-Frequency Switch. Springer Science & Business Media. p. 1. ISBN   9783319011653.
  40. Belmudez, Benjamin (2014). Audiovisual Quality Assessment and Prediction for Videotelephony. Springer. pp. 11–13. ISBN   9783319141664.
  41. "Significant Achievements in Space Communications and Navigation, 1958-1964" (PDF). NASA-SP-93. NASA. 1966. pp. 30–32. Retrieved 2009-10-31.
  42. France Télécom, Commission Supérieure Technique de l'Image et du Son, Communiqué de presse, Paris, October 29th, 2001.
  43. "«Numérique : le cinéma en mutation», Projections, 13, CNC, Paris, September 2004, p. 7" (PDF). Archived from the original (PDF) on 2016-05-15. Retrieved 2014-11-17.
  44. Bomsel, Olivier; Le Blanc, Gilles (2002). Dernier tango argentique. Le cinéma face à la numérisation. Presses des MINES. p. 12. ISBN   9782911762420.{{cite book}}: |work= ignored (help)
  45. Pauchon, Bernard (2001). "France Telecom and digital cinema". ShowEast. p. 10.
  46. Georgescu, Alexandru (2019). Critical Space Infrastructures. Risk, Resilience and Complexity. Springer. p. 48. ISBN   9783030126049.
  47. "Première numérique pour le cinéma français". 01net. 2002. Archived from the original on 2021-04-23. Retrieved 2014-11-17.
  48. "George Stibitz". Kerry Redshaw. 1996.
  49. Hafner, Katie (1998). Where Wizards Stay Up Late: The Origins Of The Internet. Simon & Schuster. ISBN   0-684-83267-4.
  50. "NORSAR and the Internet: Together since 1973". NORSAR. 2006. Archived from the original on 2005-09-10.
  51. Cerf, Vint (December 1974). Specification of Internet Transmission Control Protocol. IETF. doi: 10.17487/RFC0675 . RFC 675.
  52. USA 4293948,Olof Soderblom,"Data transmission system",issued October 6, 1981
  53. Metcalfe, Robert M.; Boggs, David R. (July 1976). "Ethernet: Distributed Packet Switching for Local Computer Networks". Communications of the ACM. 19 (5): 395–404. doi: 10.1145/360248.360253 . S2CID   429216.
  54. Maloberti, Franco; Davies, Anthony C. (2016). "History of Electronic Devices" (PDF). A Short History of Circuits and Systems: From Green, Mobile, Pervasive Networking to Big Data Computing. IEEE Circuits and Systems Society. pp. 59-70 (65-7). ISBN   9788793609860. Archived from the original (PDF) on 2021-09-30. Retrieved 2019-11-29.
  55. 1 2 3 4 5 6 Allstot, David J. (2016). "Switched Capacitor Filters" (PDF). In Maloberti, Franco; Davies, Anthony C. (eds.). A Short History of Circuits and Systems: From Green, Mobile, Pervasive Networking to Big Data Computing. IEEE Circuits and Systems Society. pp. 105–110. ISBN   9788793609860. Archived from the original (PDF) on 2021-09-30. Retrieved 2019-11-29.
  56. 1 2 3 Floyd, Michael D.; Hillman, Garth D. (8 October 2018) [1st pub. 2000]. "Pulse-Code Modulation Codec-Filters". The Communications Handbook (2nd ed.). CRC Press. pp. 26–1, 26–2, 26–3. ISBN   9781420041163.
  57. 1 2 3 Golio, Mike; Golio, Janet (2018). RF and Microwave Passive and Active Technologies. CRC Press. pp. ix, I–1. ISBN   9781420006728.
  58. Rappaport, T. S. (November 1991). "The wireless revolution". IEEE Communications Magazine . 29 (11): 52–71. doi:10.1109/35.109666. S2CID   46573735.
  59. "The wireless revolution". The Economist . January 21, 1999. Retrieved 12 September 2019.
  60. 1 2 3 4 5 Baliga, B. Jayant (2005). Silicon RF Power MOSFETS. World Scientific. ISBN   9789812561213.
  61. 1 2 Harvey, Fiona (May 8, 2003). "The Wireless Revolution". Encyclopedia Britannica . Retrieved 12 September 2019.
  62. Oxner, E. S. (1988). Fet Technology and Application. CRC Press. p. 18. ISBN   9780824780500.
  63. Duncan, Ben (1996). High Performance Audio Power Amplifiers. Elsevier. pp.  177–8, 406. ISBN   9780080508047.
  64. 1 2 3 O'Neill, A. (2008). "Asad Abidi Recognized for Work in RF-CMOS". IEEE Solid-State Circuits Society Newsletter. 13 (1): 57–58. doi:10.1109/N-SSC.2008.4785694. ISSN   1098-4232.
  65. 1 2 Asif, Saad (2018). 5G Mobile Communications: Concepts and Technologies. CRC Press. pp. 128–134. ISBN   9780429881343.
  66. Colinge, Jean-Pierre; Greer, James C. (2016). Nanowire Transistors: Physics of Devices and Materials in One Dimension. Cambridge University Press. p. 2. ISBN   9781107052406.

Sources

Further reading