The Advertising Industry The advertising industry is dominated by three huge advertising networks, which offer their services throughout the world. Gross income of the three leading agencies is twice as much, as the one of places four to ten. Table: World's Top 10 Advertising Organizations 1999 (figures in millions of U.S. dollars)
Table: Top 10 Global Marketers 1998 (figures in millions of U.S. dollars)
On the other hand the three biggest advertisers only spend about US$ 2 millions less than places four to ten together. Whereas money spent on advertising in traditional media comes from very diverse categories, companies offering computer hard- and software, peripherals or Internet services mainly pay for on-line advertisements. Table: Top 10 Internet Advertisers 1998 (figures in millions of U.S. dollars)
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Commercial vs. Independent Content Commercial media aim towards economies of scale and scope, with the goal to maximize profits. As advertising money usually is their primary source of revenue their content very often is attuned to meet the needs of advertisers and marketers. Information necessary for a citizen's participation in the public sphere usually only plays a minor role in their programming, as it does not comply with the demands of an economic system whose principal aim is the generation of profit. They also virtually always are structured in accord with and to help reinforce society's defining hierarchical social relationships, and are generally controlled by and controlling of other major social institutions, particularly corporations. Independent content provider on the other hand mostly act on a non-profit basis and try to avoid dependence on corporate powers and the state. One of their main concerns is the critical observation of public interest issues. The central aim of independent content provider's activities usually is to bring aspects and standpoints neglected by the (commercial) mainstream media to the public and subvert society's defining hierarchical social relationships. Promoting public debate and an active civil society they engage in the organization of alert actions and information campaigns or create subversive art | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Timeline 1900-1970 AD 1913 the wheel cipher gets re-invented as a strip 1917 - an AT&T-employee, Gilbert S. Vernam, invents a polyalphabetic cipher machine that works with random-keys 1918 the Germans start using the ADFGVX-system, that later gets later by the French Georges Painvin - Arthur Scherbius patents a ciphering machine and tries to sell it to the German Military, but is rejected 1919 Hugo Alexander Koch invents a rotor cipher machine 1921 the Hebern Electric Code, a company producing electro-mechanical cipher machines, is founded 1923 Arthur Scherbius founds an enterprise to construct and finally sell his late 1920's/30's more and more it is criminals who use cryptology for their purposes (e.g. for smuggling). Elizabeth Smith Friedman deciphers the codes of rum-smugglers during prohibition regularly 1929 Lester S. Hill publishes his book Cryptography in an Algebraic Alphabet, which contains enciphered parts 1933-1945 the Germans make the Enigma machine its cryptographic main-tool, which is broken by the Poles Marian Rejewski, Gordon Welchman and Alan Turing's team at Bletchley Park in England in 1939 1937 the Japanese invent their so called Purple machine with the help of Herbert O. Yardley. The machine works with telephone stepping relays. It is broken by a team of 1930's the Sigaba machine is invented in the USA, either by W.F. Friedman or his colleague Frank Rowlett - at the same time the British develop the Typex machine, similar to the German Enigma machine 1943 Colossus, a code breaking computer is put into action at Bletchley Park 1943-1980 the cryptographic Venona Project, done by the NSA, is taking place for a longer period than any other program of that type 1948 Shannon, one of the first modern cryptographers bringing mathematics into cryptography, publishes his book A Communications Theory of Secrecy Systems 1960's the Communications-Electronics Security Group (= CESG) is founded as a section of Government Communications Headquarters (= GCHQ) late 1960's the IBM Watson Research Lab develops the Lucifer cipher 1969 James Ellis develops a system of separate public-keys and private-keys | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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The Concept of the Public Sphere According to social critic and philosopher The system of the public sphere is extremely complex, consisting of spatial and communicational publics of different sizes, which can overlap, exclude and cover, but also mutually influence each other. Public sphere is not something that just happens, but also produced through social norms and rules, and channeled via the construction of spaces and the media. In the ideal situation the public sphere is transparent and accessible for all citizens, issues and opinions. For democratic societies the public sphere constitutes an extremely important element within the process of public opinion formation. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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An Economic and therefore Governmental Issue While the digital divide might bring up the idea that enterprises will be able to sell more and more computers during the next years another truth looks as if there was no hope for a certain percentage of the population to get out of their marginalization, their position of being "have nots". Studies show that the issue of different colors of skin play a role in this, but more than "racial" issues it is income, age and education that decides about the have and have nots. There exist ~ 103 million households in the USA. ~6 million do not even have telephone access. Why should they care about computers? The digital divide cuts the world into centers and peripheries, not into nations, as it runs through the boarder between the North and the South as well as through nations. The most different institutions with various interests in their background work in that field; not rarely paid by governments, which are interested in inhabitants, connected to the net and economy. see also: Searching information about the digital divide one will find informations saying that it is growing all the time whereas other studies suggest the contrary, like this one | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Steganography Ciphers as well as codes are transmitted openly. Everyone can see that they exist. Not so with steganograms. Steganography is the art and science of communicating in a way which hides the existence of the secret part in that communication. During the Italian Renaissance and the time of the Elizabethan Age in England cryptography was very popular, for political reasons as well as for amusements (see John Dee). In literature steganography played an important role. Many steganographs of that period have only been deciphered recently like some of the Shakespearean sonnets, which now seem to proof that the actor William Shakespeare was not the author of the famous poems and dramas, but that the latter' name was, and Francis Bacon, or even Francis Tudor, as some ciphers and other sources talk of him as Queen Elisabeth I.'s secret son. for further details see: One kind of steganogram is digital watermarking: Watermarks protect digital images, videos, but also audio and multimedia products. They are made out of digital signals, put into other digital signals. They try to be invisible on first sight and should be nearly impossible to remove. The process of producing watermarks is to overlay some sort of identifying image over the original image (non-digital watermarks, like on money can be seen by holding the paper against light). Copying the image destroys the watermark, which cannot be copied. Any alteration of the original destroys the watermark, too. Watermarking is one of the typical inventions of cryptography to assist the biggest content owners, but advertised as something necessary and helpful for everybody. Who in fact gets any advantage out of watermarking? The private user most of the time will not really need it except for small entities of pictures maybe. But the big enterprises do. There is a tendency to watermark more and more information in the Internet, which until now was considered as free and as a cheap method to receive information. Watermarking could stop this democratic development. for further information see: | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Definition During the last 20 years the old "Digital divide" describes the fact that the world can be divided into people who do and people who do not have access to (or the education to handle with) modern information technologies, e.g. cellular telephone, television, Internet. This digital divide is concerning people all over the world, but as usually most of all people in the formerly so called third world countries and in rural areas suffer; the poor and less-educated suffer from that divide. More than 80% of all computers with access to the Internet are situated in larger cities. "The cost of the information today consists not so much of the creation of content, which should be the real value, but of the storage and efficient delivery of information, that is in essence the cost of paper, printing, transporting, warehousing and other physical distribution means, plus the cost of the personnel manpower needed to run these `extra' services ....Realizing an autonomous distributed networked society, which is the real essence of the Internet, will be the most critical issue for the success of the information and communication revolution of the coming century of millennium." (Izumi Aizi) for more information see: | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Economic structure; introduction "Globalization is to no small extent based upon the rise of rapid global communication networks. Some even go so far as to argue that "information has replaced manufacturing as the foundation of the economy". Indeed, global media and communication are in some respects the advancing armies of global capitalism." (Robert McChesney, author of "Rich Media, Poor Democracy") "Information flow is your lifeblood." (Bill Gates, founder of Microsoft) The usefulness of information and communication technologies increases with the number of people who use them. The more people form part of communication networks, the greater the amount of information that is produced. Microsoft founder Bill Gates dreams of "friction free capitalism", a new stage of capitalism in which perfect information becomes the basis for the perfection of the markets. But exploitative practices have not disappeared. Instead, they have colonised the digital arena where effective protective regulation is still largely absent. Following the dynamics of informatised economies, the consumption habits and lifestyles if customers are of great interest. New technologies make it possible to store and combine collected data of an enormous amount of people. User profiling helps companies understand what potential customers might want. Often enough, such data collecting takes place without the customer's knowledge and amounts to spying. "Much of the information collection that occurs on the Internet is invisible to the consumer, which raises serious questions of fairness and informed consent." (David Sobel, Electronic Privacy Information Center) | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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1800 - 1900 A.D. 1801 Invented by Joseph Marie Jacquard, an engineer and architect in Lyon, France, punch cards laid the ground for automatic information processing. For the first time information was stored in binary format on perforated cardboard cards. In 1890 Hermann Hollerith used Joseph-Marie Jacquard's punch card technology to process statistical data collected during the US census in 1890, thus speeding up US census data analysis from eight to three years. Hollerith's application of Jacquard's invention was used for programming computers and data processing until electronic data processing was introduced in the 1960's. - As with Paper tapes are a medium similar to Jacquard's punch cards. In 1857 Sir Charles Wheatstone used them for the preparation, storage, and transmission of data for the first time. Through paper tapes telegraph messages could be stored, prepared off-line and sent ten times quicker (up to 400 words per minute). Later similar paper tapes were used for programming computers. 1809 With Samuel Thomas Soemmering's invention of the electrical telegraph the telegraphic transmission of messages was no longer tied to visibility, as it was the case with smoke and light signals networks. Economical and reliable, the electric telegraph became the state-of-the-art communication system for fast data transmissions, even over long distances. Click 1861 The telephone was not invented by Alexander Graham Bell, as is widely held, but by Philipp Reiss, a German teacher. When he demonstrated his invention to important German professors in 1861, it was not enthusiastically greeted. Because of this dismissal, he was not given any financial support for further development. And here Bell comes in: In 1876 he successfully filed a patent for the telephone. Soon afterwards he established the first telephone company. 1866 First functional underwater telegraph cable is laid across the Atlantic 1895 Invention of the wireless telegraph | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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1900 - 2000 A.D. 1904 First broadcast talk 1918 Invention of the short-wave radio 1929 Invention of television in Germany and Russia 1941 Invention of microwave transmission 1946 Long-distance coaxial cable systems and mobile telephone services are introduced in the USA. 1957 First data transmissions over regular phone circuits. At the beginning of the story of today's global data networks is the story of the development of In 1955 President Eisenhower announced the USA's intention to launch a satellite. But it in the end it was the Soviet Union, which launched the first satellite in 1957: Sputnik I. After Sputnik's launch it became evident that the Cold War was also a race for leadership in the application of state-of-the-art technology to defense. As the US Department of Defense encouraged the formation of high-tech companies, it laid the ground to Silicon Valley, the hot spot of the world's computer industry. The same year as the USA launched their first satellite - Explorer I - data was transmitted over regular phone circuits for the first time, thus laying the ground for today's global data networks. Today's satellites may record weather data, scan the planet with powerful cameras, offer global positioning and monitoring services, and relay high-speed data transmissions. Yet up to now, most satellites are designed for military purposes such as reconnaissance. 1969 ARPAnet was the small network of individual computers connected by leased lines that marked the beginning of today's global data networks. An experimental network it mainly served the purpose of testing the feasibility of In 1969 ARPANET went online and linked the first two computers, one located at the University of California, Los Angeles, the other at the Stanford Research Institute. Yet ARPAnet did not become widely accepted before it was demonstrated in action to a public of computer experts at the First International Conference on Computers and Communication in Washington, D. C. in 1972. Before it was decommissioned in 1990, In the USA it was already in 1994 that commercial users outnumbered military and academic users. Despite the rapid growth of the Net, most computers linked to it are still located in the United States. 1971 Invention of 1979 Introduction of 1992 Launch of the | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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"Project Censored" Project Censored was launched at Sonoma State University (U.S.) in 1976 as an annual review of the systematic withholding of public access to important news facts by the mainstream media. The team composed of student media researcher and media analysts annually selects and publishes what they believe are the 25 most important under-covered news stories. "The essential issue raised by the project is the failure of the mass media to provide the people with all the information they need to make informed decisions concerning their own lives and in the voting booth". (Project Censored) | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Product Placement With television still being very popular, commercial entertainment has transferred the concept of soap operas onto the Web. The first of this new species of "Cybersoaps" was | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Satyrs, Frankenstein, Machine Men, Cyborgs The idea of hybrid beings between man and non-human entities can be traced back to mythology: mythologies, European and non-European are populated with beings which are both human and non-human, and which, because of this non-humanness, have served as reference points in the human endeavour of understanding what it means to be human. Perhaps "being human" is not even a meaningful phrase without the possibility to identify ourselves also with the negation of humanness, that is, to be human through the very possibility of identification with the non-human. While in classical mythology, such being were usually between the man and animal kingdoms, or between the human and the divine, the advent of modern technology in the past two centuries has countered any such irrational representations of humanness. The very same supremacy of rationality which deposited the hybrid beings of mythology (and of religion) on the garbage heap of the modern period and which attempted a "pure" understanding of humanness, has also been responsible for the rapid advance of technology and which in turn prepared a "technical" understanding of the human. The only non-human world which remains beyond the animal and divine worlds is the world of technology. The very attempt of a purist definition of the human ran encountered difficulty; the theories of Darwin and Freud undermined the believe that there was something essentially human in human beings, something that could be defined without references to the non-human. Early representations of half man - half machine creatures echo the fear of the violent use of machinery, as in wars. Mary Shelley published What human minds have later dreamed up about - usually hostile - artificial beings has segmented in the literary genre of science fiction. Science fiction seems to have provided the "last" protected zone for the strong emotions and hard values which in standard fiction literature would relegate a story into the realm of kitsch. Violent battles, strong heroes, daring explorations, infinity and solitude, clashes of right and wrong and whatever else makes up the aesthetic repertoire of metaphysics has survived unscathed in science fiction. However, science fiction also seems to mark the final sequence of pure fiction: the In the Flesh Machine the | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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B2-92 B2-92 is an independent FM radio station based in Belgrade, which has won a number of international press and media awards. Their broadcasts and music and uncensored news heard across Serbia through a network of local partner stations. Their signal was also picked up by the BBC World Service and retransmitted via satellite around the world. In December 1996, B2-92 began using technology to stream live audio broadcasts and short video clips over the Internet. Strategies and Policies From its start as a terrestrial broadcaster B2-92 has been a respected source of independent news in the Balkans. Although B2-92 has been constantly subjected to repression and threat by government authorities it continued to provide music and news. When in December 1996 B2-92 was banned from broadcasting it began to distribute its content via streaming audio and video on its website. A web savvy support group was formed helping B2-92 to continue its distribution of news. Anonymous e-mail lists were developed to protect the identity of those wishing to express their views about the war, as well as a message boards linking to the Help B2-92 Campaign site. Furthermore encrypted e-mail services were provided for journalists and others in the former Yugoslavia who found themselves under threat. B2-92 also co-operates with various media activists and support groups and networks, which help B2-92 to continue its content distribution. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Economic structure; transparent customers Following the dynamics of informatised economies, the consumption habits and lifestyles if customers are of great interest. New technologies make it possible to store and combine collected data of an enormous amount of people. User profiling helps companies understand what potential customers might want. Often enough, such data collecting takes place without the customer's knowledge and amounts to spying. "Much of the information collection that occurs on the Internet is invisible to the consumer, which raises serious questions of fairness and informed consent." (David Sobel, Electronic Privacy Information Center) | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Internet Content Providers Perspective As within the traditional media landscape, Internet content providers have two primary means of generating revenue: Direct sales or subscriptions, and advertising. Especially as charging Internet users for access to content - with all the free material available - has proven problematic, advertising is seen as the best solution for creating revenues in the short term. Therefore intense competition has started among Internet content providers and access services to attract advertising money. Table: Web-Sites Seeking Advertising
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Pressures and Attacks against Independent Content Providers: Serbia The independent Belgrade based FM radio-station B2-92, which from December 1996 on also broadcasts over the Internet, repeatedly has been the target of suppression and attacks by the Serbian government. B2-92 offices have been raided on numerous occasions and members of staff have been repeatedly harassed or arrested. In March 1999 the transmitter of radio B2-92 was confiscated yet again by the Serbian authorities and editor-in-chief, Veran Matic, was taken and held in custody at a police station. Ten days after the confiscation of B2-92's transmitter, Serbian police entered and sealed their offices. All members of staff were sent home and a new General Manager was appointed by Serbian officials. Although by closing B2-92, the Serbian regime may have succeeded in softening the voice of the independent content provider, with the distributive nature of the Internet and the international help of media activists, the regime will have little chance of silencing the entire flood of independent content coming out of former Yugoslavia. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Calculator Calculators are machines for automatically performing arithmetical operations and certain mathematical functions. Modern calculators are descendants of a digital arithmetic machine devised by | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Moral rights Authors of copyrighted works (besides | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Cyborg manifesto The full title of Dona Haraway's Cyborg Manifesto is "A Cyborg Manifesto: Science, Technology, and Socialist-Feminism in the Late Twentieth Century", published by Routledge, New York, in 1991. Online e excerpts of this classic are located at | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Gerard J. Holzmann and Bjoern Pehrson, The Early History of Data Networks This book gives a fascinating glimpse of the many documented attempts throughout history to develop effective means for long distance communications. Large-scale communication networks are not a twentieth-century phenomenon. The oldest attempts date back to millennia before Christ and include ingenious uses of homing pigeons, mirrors, flags, torches, and beacons. The first true nationwide data networks, however, were being built almost two hundred years ago. At the turn of the 18th century, well before the electromagnetic telegraph was invented, many countries in Europe already had fully operational data communications systems with altogether close to one thousand network stations. The book shows how the so-called information revolution started in 1794, with the design and construction of the first true telegraph network in France, Chappe's fixed optical network. http://www.it.kth.se/docs/early_net/ | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Roman smoke telegraph network, 150 A.D. The Roman smoke signals network consisted of towers within visible range of each other and had a total length of about 4500 kilometers. It was used for military signaling. For a similar telegraph network in ancient Greece see | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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ciphers the word "cipher" comes from the Hebrew word "saphar", meaning "to number". Ciphers are mere substitutions. Each letter of the alphabet gets substituted; maybe by one letter or two or more. an example: PLAINTEXT a b c d e f g h i j k l m n o p q r s t u v w x y z CIPHERTEXT D E F G H I J K L M N O P Q R S T U V W X Y Z A B C | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Next Generation Internet Program A research and development program funded by the US government. Goal is the development of advanced networking technologies and applications requiring advanced networking with capabilities that are 100 to 1,000 times faster end-to-end than today's Internet. http://www.ngi.gov | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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John Dee b. July 13, 1527, London, England d. December 1608, Mortlake, Surrey English alchemist, astrologer, and mathematician who contributed greatly to the revival of interest in mathematics in England. After lecturing and studying on the European continent between 1547 and 1550, Dee returned to England in 1551 and was granted a pension by the government. He became astrologer to the queen, Mary Tudor, and shortly thereafter was imprisoned for being a magician but was released in 1555. Dee later toured Poland and Bohemia (1583-89), giving exhibitions of magic at the courts of various princes. He became warden of Manchester College in 1595. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Above.net Headquartered in San Jose, USA, AboveNet Communications is a http://www.above.net | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Braille Universally accepted system of writing used by and for blind persons and consisting of a code of 63 characters, each made up of one to six raised dots arranged in a six-position matrix or cell. These Braille characters are embossed in lines on paper and read by passing the fingers lightly over the manuscript. Louis Braille, who was blinded at the age of three, invented the system in 1824 while a student at the Institution Nationale des Jeunes Aveugles (National Institute for Blind Children), Paris. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Chappe's fixed optical network Claude Chappe built a fixed optical network between Paris and Lille. Covering a distance of about 240kms, it consisted of fifteen towers with semaphores. Because this communication system was destined to practical military use, the transmitted messages were encoded. The messages were kept such secretly, even those who transmit them from tower to tower did not capture their meaning, they just transmitted codes they did not understand. Depending on weather conditions, messages could be sent at a speed of 2880 kms/hr at best. Forerunners of Chappe's optical network are the For more information on early communication networks see | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Louis Braille b. Jan. 4, 1809, Coupvray, near Paris, France d. Jan. 6, 1852, Paris, France Educator who developed a system of printing and writing that is extensively used by the blind and that was named for him. Himself blind Braille became interested in a system of writing, exhibited at the school by Charles Barbier, in which a message coded in dots was embossed on cardboard. When he was 15, he worked out an adaptation, written with a simple instrument, that met the needs of the sightless. He later took this system, which consists of a six-dot code in various combinations, and adapted it to musical notation. He published treatises on his type system in 1829 and 1837. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Optical communication system by Aeneas Tacitus, 4th century B.C. Aeneas Tacitus, a Greek military scientist and cryptographer, invented an optical communication system that combines water and beacon telegraphy. Torches indicated the beginnings and the ends of message transmissions while water jars were used to transmit the messages. These jars had a plugged standard-size hole drilled on the bottom side and were filled with water. As those who sent and those who received the message unplugged the jars simultaneously, the water drained out. Because the transmitted messages corresponded to water levels, the sender indicated by torch signal that the appropriate water level has been reached. It is a disadvantage that the possible messages are restricted to a given code, but as this system was mainly used for military purposes, this was offset by the advantage that it was almost impossible for outsiders to understand these messages unless they possessed the codebook. With communication separated from transportation, the distant became near. Tacitus' telegraph system was very fast and not excelled until For further information see Joanne Chang & Anna Soellner, Decoding Device, | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Fiber-optic cable networks Fiber-optic cable networks may become the dominant method for high-speed Internet connections. Since the first fiber-optic cable was laid across the Atlantic in 1988, the demand for faster Internet connections is growing, fuelled by the growing network traffic, partly due to increasing implementation of corporate networks spanning the globe and to the use of graphics-heavy contents on the Fiber-optic cables have not much more in common with copper wires than the capacity to transmit information. As copper wires, they can be terrestrial and submarine connections, but they allow much higher transmission rates. Copper wires allow 32 telephone calls at the same time, but fiber-optic cable can carry 40,000 calls at the same time. A capacity, Copper wires will not come out of use in the foreseeable future because of technologies as For technical information from the Encyclopaedia Britannica on telecommunication cables, click An entertaining report of the laying of the FLAG submarine cable, up to now the longest fiber-optic cable on earth, including detailed background information on the cable industry and its history, Neal Stephenson has written for Wired: Mother Earth Mother Board. Click Susan Dumett has written a short history of undersea cables for Pretext magazine, Evolution of a Wired World. Click A timeline history of submarine cables and a detailed list of seemingly all submarine cables of the world, operational, planned and out of service, can be found on the Web site of the For maps of fiber-optic cable networks see the website of | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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