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Buryatia was created in 1923.

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The country code and area code of Buryatia region, Russian Federation is 7, (8)301.

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No, Buryatia is not a country. It is a federal subject of Russia, located in Siberia near Lake Baikal. It is an autonomous republic with its own government within the Russian Federation.

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Lake Baikal is in southeastern Siberia the Republic of Buryatia and Irkutsk (in Russia.)

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Aleksandr Itygilov was born on August 6, 1944, in Peteropavlovka, Buryatia, Soviet Union [now Russia].

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Yevgeni Sherstobitov was born on June 19, 1928, in Verkhneudinsk, Soviet Union [now Ulan-Ude, Buryatia province, Russia].

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Altangerel L. Bugat has written:

'Greater Mongolia without pan-mongolism? Mongolia, Buryatia and the prospect for cross-border integration'

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Baras Khalzanov was born on September 1, 1938, in Zhargalantuy, Buryatia province, Soviet Union [now Russia].

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The location you provided corresponds to the city of Ulan-Ude in Russia. Ulan-Ude is the capital of the Republic of Buryatia and is known for its rich cultural heritage and unique blend of Russian and Asian influences.

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The primary religion in Russia is Russian Orthodoxy, which is a form of Eastern Orthodox Christianity. It is the largest religious denomination in the country, followed by other Christian denominations and Islam.

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Russian, is a nationality. Just like American. There are many ethnic groups, that make up Russians. Most of them, being the ethnic Slavs who inhabit European Russia. In Chechnya, these people aren't Slavs. They are minority Muslims living in Russia. They are Chechen people, these are Turks. They speak the Chechen language as a native, and Russian as a second language. There are also Mongols living in Buryatia, they are the Buryats. They speak the Buryat dialect. There also Yakuts, and Oriental people living in Russian near Japan and Korea. These areas, were never part of Japan and Korea but the Russians living there simply come from the same family of people as Japanese and Koreans. I've mistaken some Russians to be a Korean which sometimes gets pretty ridiculous.

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nobody knows

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Buddhism has some central teachings at its very heart, these have been developed in a range of ways,reflecting the individual needs of different people over many centuries. Each of these different approaches can be thought of as a 'school' of Buddhism.

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The following places always have the same time as China, Taiwan, Macau and Hong Kong (UTC+8):

  • Buryatia Republic, Irkutsk Oblast and Zabaykalsky Krai, Russia (since Oct. 2014)
  • Dzavhan, Govi-Altay, Hövsgöl, Bayanhongor, Arhangay, Ömnögovi, Övörhangay, Bulgan, Dundgovi, Töv, Selenge, Dornogovi, Hentiy, Sühbaatar and Dornod, Mongolia
  • The Philippines
  • Brunei
  • Malaysia
  • Singapore
  • East Kalimantan, South Kalimantan, North Sulawesi, Gorontalo, Central Sulawesi, West Sulawesi, South Sulawesi, South East Sulawesi, Bali, West Nusa Tenggara and East Nusa Tenggara, Indonesia
  • Western Australia, Australia
  • Casey Station in Antarctica

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Since October 2014, the Russian Federation is divided among eleven time zones.

The time in Kaliningrad Oblast is UTC + 2 hours.

Among the contiguous parts of Russia, the time is...

  • ... UTC + 3 hours west of and including Nenetsia Autonomous Okrug, Komi Republic, Kirov Oblast, Tatarstan Republic, Ulyanovsk Oblast and Saratov Oblast.
  • ... UTC + 4 hours in Udmurtia Republic and Samara Oblast.
  • ... UTC + 5 hours in Yamalia and Khantia-Mansia Autonomous Okrugs, Tyumen, Sverdlovsk, Kurgan, Chelyabinsk and Orenburg Oblasts, Bashkortostan Republic and Perm Krai.
  • ... UTC + 6 hours in Tomsk, Omsk and Novosibirsk Oblasts, Altai Krai and Altai Republic.
  • ... UTC + 7 hours in Kemerovo Oblast, Krasnoyarsk Krai and Khakassia and Tuva Republics.
  • ... UTC + 8 hours in Irkutsk Oblast, Buryatia Republic and Zabaykalsk Krai.
  • ... UTC + 9 hours in Amur Oblast and the western part of Sakha Republic.
  • ... UTC + 10 hours in Khabarovsk and Primorsky Krais, Sakhalin Oblast except the Severo-Kurilsky District, Jewish Autonomous Oblast, the central part of Sakha Republic and Magadan Oblast.
  • ... UTC + 11 hours in the eastern part of Sakha Republic and the Severo-Kurilsky District of Sakhalin Oblast.
  • ... UTC + 12 hours in Kamchatka Krai and Chukotka Autonomous Okrug.

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Tatars are the second largest ethnic group in Russia after Russians.

Tatars can, however, be said to be largest minority ethnic group in Russia. Sometimes, when talking about "ethnic groups" or "ethnic population" people exclude the majority population from consideration. Only in that sense can Tatars be said to be the largest ethnic group in Russia.
Turkic is the second largest ethnic group in Russia after Slavic.

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Lake Bakail is not only deepest lake in the world; it is also the deepest freshwater lake, and the oldest and most voluminous in the entire world! It lies in Southern Siberia in Russia (Asia) between Irkutsk Oblast to the northwest and Buryatia to the southeast. It is 1,638 metres deep. It is 636 km long and is the world's sixth largest lake and 1,181 metres of it is below sea level. It contains 20% of the world's fresh water which is so clear that divers suffer from vertigo. Based on sediment at the bottom, it is also the world's oldest lake at 25 million years, based on an ancient fault, the Olkhon Crevice. 2,000 species of plant and animal life have been identified in Lake Baikal, 75% of which appears nowhere else in the world.

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Lake Baikal in southern Siberia has a maximum depth of 1,642 m (5,387 ft). It is also the worlds biggest fresh water lake by volume with 23,615.39 km³ (5,700 cu mi) of fresh water.

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Mongolia has been inhabited for over 850,000 years.[1]Important prehistoric sites are the paleolithic cave drawings of the Khoid Tsenkheriin Agui (Northern Cave of Blue) inKhovd province,[2]and the Tsagaan Agui (White Cave) in Bayankhongorprovince.[3] A neolithic farming settlement has been found in Dornod province. Contemporary findings from western Mongolia include only temporary encampments of hunters and fishers. The population during the Copper Age has been described as paleomongolid in the east of what is now Mongolia, and as europid in the west.[2]

Slab Grave Culture is a Mongolic archaeological culture of the Late Bronze Age and Early Iron Age.[4]This culture is the main archaeological find of the Bronze Age Mongolia.

The geographic area the Slab Grave culture covered

Slab Grave cultural monuments are found in northern, central and eastern Mongolia, Inner Mongolia, Northwest China(Xinjiang region,Qilian Mountains etc.), Manchuria, Lesser Khingan, Buryatia, Irkutsk Oblast and Zabaykalsky Krai.

In the 2nd millennium B.C, during the bronze age, western Mongolia was under the influence of the Karasuk culture. Deer stones and the omnipresent kheregsüürs (small kurgans) probably are from this era; other theories date the deer stones as 7th or 8th centuries BC. A vast Iron Age burial complex from the 5th-3rd century, later also used by the Xiongnu, has been unearthed near Ulaangom.[2]

Before the 20th century, some scholars assumed that the Scythians descended from the Mongolic people.[5]The Scythian community inhabited western Mongolia in the 5-6th century. In 2006 the mummy of a Scythian warrior, which is believed to be about 2,500 years old was a 30-to-40 year-old man with blond hair, and was found in the Altai, Mongolia.[6]

In historical times the Altaic peoples were concentrated on the steppe lands of Central Asia.[7]Furthermore, it is assumed that the Turkic peopleshavealways inhabited the western, the Mongols the central, and the Tungusic peoples the eastern portions of the Altaic region.[7]

By the eighth century B.C., the inhabitants of Mongolian western part evidently were nomadic Indo-European speakers, either Scythians [8]or Yuezhi. In central and eastern parts of Mongolia were many other tribes that were primarily Mongol in their ethnologic characteristics.[8]

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In accordance with Article 65 of the Constitution of the Russian Federation it consists of

1. The Russian Federation includes the following subjects of the Russian Federation:

the Republic of Adygeya (Adygeya), the Republic of Altai, the Republic of Bashkortostan, the Republic of Buryatia, the Republic of Daghestan, the Republic of Ingushetia, the Kabardino-Balkarian Republic, the Republic of Kalmykia, the Karachayevo-Circassian Republic, the Republic of Karelia, the Komi Republic, the Republic of Marii El, the Republic of Mordovia, the Republic of Sakha (Yakutia), the Republic of North Ossetia - Alania, the Republic of Tatarstan (Tatarstan), the Republic of Tuva, the Udmurtian Republic, the Republic of Khakassia, the Chechen Republic, the Chuvash Republic - Chuvashia;

the Altai Territory, the Krasnodar Territory, the Krasnoyarsk Territory, the Primorie Territory, the Stavropol Territory, the Khabarovsk Territory;

the Amur Region, the Archangel Region, the Astrakhan Region, the Belgorod Region, the Bryansk Region, the Vladimir Region, the Volgograd Region, the Vologda Region, the Voronezh Region, the Ivanovo Region, the Irkutsk Region, the Kaliningrad Region, the Kaluga Region, the Kamchatka Region, the Kemerovo Region, the Kirov Region, the Kostroma Region, the Kurgan Region, the Kursk Region, the Leningrad Region, the Lipetsk Region, the Magadan Region, the Moscow Region, the Murmansk Region, the Nizhni Novgorod Region, the Novgorod Region, the Novosibirsk Region, the Omsk Region, the Orenburg Region, the Orel Region, the Penza Region, the Perm Region, the Pskov Region, the Rostov Region, the Ryazan Region, the Samara Region, the Saratov Region, the Sakhalin Region, the Sverdlovsk Region, the Smolensk Region, the Tambov Region, the Tver Region, the Tomsk Region, the Tula Region, the Tyumen Region, the Ulyanovsk Region, the Chelyabinsk Region, the Chita Region, the Yaroslavl Region;

Moscow, St. Petersburg - cities of federal importance;

the Jewish Autonomous Region;

the Aginsk Buryat Autonomous Area, the Komi-Permyak Autonomous Area, the Koryak Autonomous Area, the Nenets Autonomous Area, the Taimyr (Dolgano-Nenets) Autonomous Area, the Ust-Ordyn Buryat Autonomous Area, the Khanty-Mansi Autonomous Area - Ugra, the Chukotka Autonomous Area, the Evenki Autonomous Area, the Yamalo-Nents Autonomous Area.

All in all it consists of such such subjects as respublics, regions, autonomous areas and regions and cities of federal importance.

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Early telecommunicationsA replica of one of Chappe's semaphore towers

In 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 signalling the arrival of Spanish ships.[1]

In 1792, Claude Chappe, a French engineer, built the first fixed visual telegraphy system (or semaphore line) between Lille and Paris.[2] However semaphore suffered from the need for skilled operators and expensive towers at intervals of ten to thirty kilometres (six to nineteen miles). As a result of competition from the electrical telegraph, the last commercial line was abandoned in 1880.[3]

[edit] Telegraph and telephoneThe first commercial electrical telegraph was constructed by Sir Charles Wheatstone and Sir William Fothergill Cooke and opened on 9 April 1839. Both Wheatstone and Cooke viewed their device as "an improvement to the [existing] electromagnetic telegraph" not as a new device.[4]

Samuel Morse independently developed a version of the electrical telegraph that he unsuccessfully demonstrated on 2 September 1837. His code was an important advance over Wheatstone's signaling method. The first transatlantic telegraph cable was successfully completed on 27 July 1866, allowing transatlantic telecommunication for the first time.[5]

The conventional telephone was invented independently by Alexander Bell and Elisha Gray in 1876.[6] Antonio Meucci invented the first device that allowed the electrical transmission of voice over a line in 1849. However Meucci's device was of little practical value because it relied upon the electrophonic effect and thus required users to place the receiver in their mouth to "hear" what was being said.[7] The first commercial telephone services were set-up in 1878 and 1879 on both sides of the Atlantic in the cities of New Haven and London.[8][9]

[edit] Radio and televisionIn 1832, James Lindsay gave a classroom demonstration of wireless telegraphy to his students. By 1854, he was able to demonstrate a transmission across the Firth of Tay from Dundee, Scotland to Woodhaven, a distance of two miles (3 km), using water as the transmission medium.[10] In December 1901, Guglielmo Marconi established wireless communication between St. John's, Newfoundland (Canada) and Poldhu, Cornwall (England), earning him the 1909 Nobel Prize in physics (which he shared with Karl Braun).[11] However small-scale radio communication had already been demonstrated in 1893 by Nikola Tesla in a presentation to the National Electric Light Association.[12]

On 25 March 1925, John Logie Baird was able to demonstrate the transmission of moving pictures at the London department store Selfridges. Baird's device relied upon the Nipkow disk and thus became known as the mechanical television. It formed the basis of experimental broadcasts done by the British Broadcasting Corporation beginning 30 September 1929.[13] However, for most of the twentieth century televisions depended upon the cathode ray tube invented by Karl Braun. The first version of such a television to show promise was produced by Philo Farnsworth and demonstrated to his family on 7 September 1927.[14]

[edit] Computer networks and the InternetOn 11 September 1940, George Stibitz was able to transmit problems using teletype to his Complex Number Calculator in New York and receive the computed results back at Dartmouth College in New Hampshire.[15] 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 5 December 1969; this network would become ARPANET, which by 1981 would consist of 213 nodes.[16]

ARPANET's development centred around the Request for Comment process and on 7 April 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 the Request for Comment process. In September 1981, RFC 791 introduced the Internet Protocol v4 (IPv4) and RFC 793 introduced the Transmission Control Protocol (TCP) - thus creating the TCP/IP protocol that much of the Internet relies upon today.

However, not all important developments were made through the Request for Comment 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 Soderblom on 29 October 1974 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.[17][18]

[edit] Key conceptsEtymology The word telecommunication was adapted from the French word télécommunication. It is a compound of the Greek prefix tele- (τηλε-), meaning 'far off', and the Latin communicare, meaning 'to share'.[19] The French word télécommunication was coined in 1904 by French engineer and novelist Édouard Estaunié.[20]

A number of key concepts reoccur throughout the literature on modern telecommunication systems. Some of these concepts are discussed below.

[edit] Basic elementsA basic telecommunication system consists of three elements:
  • a transmitter that takes information and converts it to a signal;
  • a transmission medium that carries the signal; and,
  • a receiver that receives the signal and converts it back into usable information.

For example, in a radio broadcast the broadcast tower is the transmitter, free space is the transmission medium and the radio is the receiver. Often telecommunication systems are two-way with a single device acting as both a transmitter and receiver or transceiver. For example, a mobile phone is a transceiver.[21]

Telecommunication over a telephone line is called point-to-point communication because it is between one transmitter and one receiver. Telecommunication through radio broadcasts is called broadcast communication because it is between one powerful transmitter and numerous receivers.[21]

[edit] Analogue or digitalSignals can be either analogue or digital. In an analogue signal, the signal is varied continuously with respect to the information. In a digital signal, the information is encoded as a set of discrete values (for example ones and zeros). During transmission the information contained in analogue signals will be degraded by noise. Conversely, unless the noise exceeds a certain threshold, the information contained in digital signals will remain intact. Noise resistance represents a key advantage of digital signals over analogue signals.[22] [edit] NetworksA network is a collection of transmitters, receivers and transceivers that communicate with each other. Digital networks consist of one or more routers that work together to transmit information to the correct user. An analogue network consists of one or more switches that establish a connection between two or more users. For both types of network, repeaters may be necessary to amplify or recreate the signal when it is being transmitted over long distances. This is to combat attenuation that can render the signal indistinguishable from noise.[23] [edit] ChannelsA channel is a division in a transmission medium so that it can be used to send multiple streams of information. For example, a radio station may broadcast at 96.1 MHz while another radio station may broadcast at 94.5 MHz. In this case, the medium has been divided by frequency and each channel has received a separate frequency to broadcast on. Alternatively, one could allocate each channel a recurring segment of time over which to broadcast-this is known as time-division multiplexing and is sometimes used in digital communication.[23] [edit] ModulationThe shaping of a signal to convey information is known as modulation. Modulation can be used to represent a digital message as an analogue waveform. This is known as keying and several keying techniques exist (these include phase-shift keying, frequency-shift keying and amplitude-shift keying). Bluetooth, for example, uses phase-shift keying to exchange information between devices.[24][25]

Modulation can also be used to transmit the information of analogue signals at higher frequencies. This is helpful because low-frequency analogue signals cannot be effectively transmitted over free space. Hence the information from a low-frequency analogue signal must be superimposed on a higher-frequency signal (known as the carrier wave) before transmission. There are several different modulation schemes available to achieve this (two of the most basic being amplitude modulation and frequency modulation). An example of this process is a DJ's voice being superimposed on a 96 MHz carrier wave using frequency modulation (the voice would then be received on a radio as the channel "96 FM").[26]

[edit] Society and telecommunicationTelecommunication has a significant social, cultural and economic impact on modern society. In 2006, estimates placed the telecommunication industry's revenue at $1.2 trillion (USD) or just under 3% of the gross world product (official exchange rate).[27] [edit] Economic impact[edit] Microeconomics

On the microeconomic scale, companies have used telecommunication to help build global empires. This is self-evident in the case of online retailer Amazon.com but, according to academic Edward Lenert, even the conventional retailer Wal-Mart has benefited from better telecommunication infrastructure compared to its competitors.[28] In cities throughout the world, home owners use their telephones to organize many home services ranging from pizza deliveries to electricians. Even relatively poor communities have been noted to use telecommunication to their advantage. In Bangladesh's Narshingdi district, isolated villagers use cell phones to speak directly to wholesalers and arrange a better price for their goods. In Cote d'Ivoire, coffee growers share mobile phones to follow hourly variations in coffee prices and sell at the best price.[29]

[edit] Macroeconomics

On the macroeconomic scale, Lars-Hendrik Röller and Leonard Waverman suggested a causal link between good telecommunication infrastructure and economic growth.[30] Few dispute the existence of a correlation although some argue it is wrong to view the relationship as causal.[31]

Because of the economic benefits of good telecommunication infrastructure, there is increasing worry about the inequitable access to telecommunication services amongst various countries of the world-this is known as the digital divide. A 2003 survey by the International Telecommunication Union (ITU) revealed that roughly one-third of countries have less than 1 mobile subscription for every 20 people and one-third of countries have less than 1 fixed line subscription for every 20 people. In terms of Internet access, roughly half of all countries have less than 1 in 20 people with Internet access. From this information, as well as educational data, the ITU was able to compile an index that measures the overall ability of citizens to access and use information and communication technologies.[32] Using this measure, Sweden, Denmark and Iceland received the highest ranking while the African countries Niger, Burkina Faso and Mali received the lowest.[33]

[edit] Social impactTelecommunication is playing an increasingly important role in social relationships. In recent years, the popularity of social networking sites has increased dramatically. These sites allow users to communicate with each other as well as post photographs, events and profiles for others to see. The profiles can list a person's age, interests, sexuality and relationship status. In this way, these sites can play important role in everything from organising social engagements to courtship.[34]

Prior to social networking sites, technologies like SMS and the telephone also had a significant impact on social interactions. In 2000, market research group Ipsos MORI reported that 81% of 15 to 24 year-old SMS users in the United Kingdom had used the service to coordinate social arrangements and 42% to flirt.[35]

[edit] Other impactsIn cultural terms, telecommunication has increased the public's ability to access to music and film. With television, people can watch films they have not seen before in their own home without having to travel to the video store or cinema. With radio and the internet, people can listen to music they have not heard before without having to travel to the music store.

Telecommunication has also transformed the way people receive their news. A survey by the non-profit Pew Internet and American Life Project found that when just over 3,000 people living in the United States were asked where they got their news "yesterday", more people said television or radio than newspapers. The results are summarised in the following table (the percentages add up to more than 100% because people were able to specify more than one source).[36]Local TVNational TVRadioLocal paperInternetNational paper59% 47% 44% 38% 23% 12%

Telecommunication has had an equally significant impact on advertising. TNS Media Intelligence reported that in 2007, 58% of advertising expenditure in the United States was spent on mediums that depend upon telecommunication.[37] The results are summarised in the following table.

InternetRadioCable TVSyndicated TVSpot TVNetwork TVNewspaperMagazineOutdoorTotalPercent7.6% 7.2% 12.1% 2.8% 11.3% 17.1% 18.9% 20.4% 2.7% 100%Dollars$11.31 billion $10.69 billion $18.02 billion $4.17 billion $16.82 billion $25.42 billion $28.22 billion $30.33 billion $4.02 billion $149 billion

[edit] Modern operation[edit] TelephoneOptical fiber provides cheaper bandwidth for long distance communication

In an analogue telephone network, the caller is connected to the person he wants to talk to by switches at various telephone exchanges. The switches form an electrical connection between the two users and the setting of these switches is determined electronically when the caller dials the number. Once the connection is made, the caller's voice is transformed to an electrical signal using a small microphone in the caller's handset. This electrical signal is then sent through the network to the user at the other end where it is transformed back into sound by a small speaker in that person's handset. There is a separate electrical connection that works in reverse, allowing the users to converse.[38][39]

The fixed-line telephones in most residential homes are analogue - that is, the speaker's voice directly determines the signal's voltage. Although short-distance calls may be handled from end-to-end as analogue signals, increasingly telephone service providers are transparently converting the signals to digital for transmission before converting them back to analogue for reception. The advantage of this is that digitized voice data can travel side-by-side with data from the Internet and can be perfectly reproduced in long distance communication (as opposed to analogue signals that are inevitably impacted by noise).

Mobile phones have had a significant impact on telephone networks. Mobile phone subscriptions now outnumber fixed-line subscriptions in many markets. Sales of mobile phones in 2005 totalled 816.6 million with that figure being almost equally shared amongst the markets of Asia/Pacific (204 m), Western Europe (164 m), CEMEA (Central Europe, the Middle East and Africa) (153.5 m), North America (148 m) and Latin America (102 m).[40] In terms of new subscriptions over the five years from 1999, Africa has outpaced other markets with 58.2% growth.[41] Increasingly these phones are being serviced by systems where the voice content is transmitted digitally such as GSM or W-CDMA with many markets choosing to depreciate analogue systems such as AMPS.[42]

There have also been dramatic changes in telephone communication behind the scenes. Starting with the operation of TAT-8 in 1988, the 1990s saw the widespread adoption of systems based on optic fibres. The benefit of communicating with optic fibres is that they offer a drastic increase in data capacity. TAT-8 itself was able to carry 10 times as many telephone calls as the last copper cable laid at that time and today's optic fibre cables are able to carry 25 times as many telephone calls as TAT-8.[43] This increase in data capacity is due to several factors: First, optic fibres are physically much smaller than competing technologies. Second, they do not suffer from crosstalk which means several hundred of them can be easily bundled together in a single cable.[44] Lastly, improvements in multiplexing have led to an exponential growth in the data capacity of a single fibre.[45][46]

Assisting communication across many modern optic fibre networks is a protocol known as Asynchronous Transfer Mode (ATM). The ATM protocol allows for the side-by-side data transmission mentioned in the second paragraph. It is suitable for public telephone networks because it establishes a pathway for data through the network and associates a traffic contract with that pathway. The traffic contract is essentially an agreement between the client and the network about how the network is to handle the data; if the network cannot meet the conditions of the traffic contract it does not accept the connection. This is important because telephone calls can negotiate a contract so as to guarantee themselves a constant bit rate, something that will ensure a caller's voice is not delayed in parts or cut-off completely.[47] There are competitors to ATM, such as Multiprotocol Label Switching (MPLS), that perform a similar task and are expected to supplant ATM in the future.[48]

[edit] Radio and televisionDigital television standards and their adoption worldwide.

In a broadcast system, a central high-powered broadcast tower transmits a high-frequency electromagnetic wave to numerous low-powered receivers. The high-frequency wave sent by the tower is modulated with a signal containing visual or audio information. The antenna of the receiver is then tuned so as to pick up the high-frequency wave and a demodulator is used to retrieve the signal containing the visual or audio information. The broadcast signal can be either analogue (signal is varied continuously with respect to the information) or digital (information is encoded as a set of discrete values).[49][50]

The broadcast media industry is at a critical turning point in its development, with many countries moving from analogue to digital broadcasts. This move is made possible by the production of cheaper, faster and more capable integrated circuits. The chief advantage of digital broadcasts is that they prevent a number of complaints with traditional analogue broadcasts. For television, this includes the elimination of problems such as snowy pictures, ghosting and other distortion. These occur because of the nature of analogue transmission, which means that perturbations due to noise will be evident in the final output. Digital transmission overcomes this problem because digital signals are reduced to discrete values upon reception and hence small perturbations do not affect the final output. In a simplified example, if a binary message 1011 was transmitted with signal amplitudes [1.0 0.0 1.0 1.0] and received with signal amplitudes [0.9 0.2 1.1 0.9] it would still decode to the binary message 1011 - a perfect reproduction of what was sent. From this example, a problem with digital transmissions can also be seen in that if the noise is great enough it can significantly alter the decoded message. Using forward error correction a receiver can correct a handful of bit errors in the resulting message but too much noise will lead to incomprehensible output and hence a breakdown of the transmission.[51][52]

In digital television broadcasting, there are three competing standards that are likely to be adopted worldwide. These are the ATSC, DVB and ISDB standards; the adoption of these standards thus far is presented in the captioned map. All three standards use MPEG-2 for video compression. ATSC uses Dolby Digital AC-3 for audio compression, ISDB uses Advanced Audio Coding (MPEG-2 Part 7) and DVB has no standard for audio compression but typically uses MPEG-1 Part 3 Layer 2.[53][54] The choice of modulation also varies between the schemes. In digital audio broadcasting, standards are much more unified with practically all countries choosing to adopt the Digital Audio Broadcasting standard (also known as the Eureka 147 standard). The exception being the United States which has chosen to adopt HD Radio. HD Radio, unlike Eureka 147, is based upon a transmission method known as in-band on-channel transmission that allows digital information to "piggyback" on normal AM or FM analogue transmissions.[55]

However, despite the pending switch to digital, analogue television remains transmitted in most countries. An exception is the United States that ended analogue television transmission on the 12th of June 2009[56] after twice delaying the switch over deadline. For analogue television, there are three standards in use (see a map on adoption here). These are known as PAL, NTSC and SECAM. For analogue radio, the switch to digital is made more difficult by the fact that analogue receivers are a fraction of the cost of digital receivers.[57][58] The choice of modulation for analogue radio is typically between amplitude modulation (AM) or frequency modulation (FM). To achieve stereo playback, an amplitude modulated subcarrier is used for stereo FM.

[edit] The InternetThe OSI reference model

The Internet is a worldwide network of computers and computer networks that can communicate with each other using the Internet Protocol.[59] Any computer on the Internet has a unique IP address that can be used by other computers to route information to it. Hence, any computer on the Internet can send a message to any other computer using its IP address. These messages carry with them the originating computer's IP address allowing for two-way communication. In this way, the Internet can be seen as an exchange of messages between computers.[60]

As of 2008[update], an estimated 21.9% of the world population has access to the Internet with the highest access rates (measured as a percentage of the population) in North America (73.6%), Oceania/Australia (59.5%) and Europe (48.1%).[61] In terms of broadband access, Iceland (26.7%), South Korea (25.4%) and the Netherlands (25.3%) led the world.[62]

The Internet works in part because of protocols that govern how the computers and routers communicate with each other. The nature of computer network communication lends itself to a layered approach where individual protocols in the protocol stack run more-or-less independently of other protocols. This allows lower-level protocols to be customized for the network situation while not changing the way higher-level protocols operate. A practical example of why this is important is because it allows an Internet browser to run the same code regardless of whether the computer it is running on is connected to the Internet through an Ethernet or Wi-Fi connection. Protocols are often talked about in terms of their place in the OSI reference model (pictured on the right), which emerged in 1983 as the first step in an unsuccessful attempt to build a universally adopted networking protocol suite.[63]

For the Internet, the physical medium and data link protocol can vary several times as packets traverse the globe. This is because the Internet places no constraints on what physical medium or data link protocol is used. This leads to the adoption of media and protocols that best suit the local network situation. In practice, most intercontinental communication will use the Asynchronous Transfer Mode (ATM) protocol (or a modern equivalent) on top of optic fibre. This is because for most intercontinental communication the Internet shares the same infrastructure as the public switched telephone network.

At the network layer, things become standardized with the Internet Protocol (IP) being adopted for logical addressing. For the world wide web, these "IP addresses" are derived from the human readable form using the Domain Name System (e.g. 72.14.207.99 is derived from www.Google.com). At the moment, the most widely used version of the Internet Protocol is version four but a move to version six is imminent.[64]

At the transport layer, most communication adopts either the Transmission Control Protocol (TCP) or the User Datagram Protocol (UDP). TCP is used when it is essential every message sent is received by the other computer where as UDP is used when it is merely desirable. With TCP, packets are retransmitted if they are lost and placed in order before they are presented to higher layers. With UDP, packets are not ordered or retransmitted if lost. Both TCP and UDP packets carry port numbers with them to specify what application or process the packet should be handled by.[65] Because certain application-level protocols use certain ports, network administrators can restrict Internet access by blocking the traffic destined for a particular port.

Above the transport layer, there are certain protocols that are sometimes used and loosely fit in the session and presentation layers, most notably the Secure Sockets Layer (SSL) and Transport Layer Security (TLS) protocols. These protocols ensure that the data transferred between two parties remains completely confidential and one or the other is in use when a padlock appears in the address bar of your web browser.[66] Finally, at the application layer, are many of the protocols Internet users would be familiar with such as HTTP (web browsing), POP3 (e-mail), FTP (file transfer), IRC (Internet chat), BitTorrent (file sharing) and OSCAR (instant messaging).

[edit] Local area networksDespite the growth of the Internet, the characteristics of local area networks (computer networks that run at most a few kilometres) remain distinct. This is because networks on this scale do not require all the features associated with larger networks and are often more cost-effective and efficient without them.

In the mid-1980s, several protocol suites emerged to fill the gap between the data link and applications layer of the OSI reference model. These were Appletalk, IPX and NetBIOS with the dominant protocol suite during the early 1990s being IPX due to its popularity with MS-DOS users. TCP/IP existed at this point but was typically only used by large government and research facilities.[67] As the Internet grew in popularity and a larger percentage of traffic became Internet-related, local area networks gradually moved towards TCP/IP and today networks mostly dedicated to TCP/IP traffic are common. The move to TCP/IP was helped by technologies such as DHCP that allowed TCP/IP clients to discover their own network address - a functionality that came standard with the AppleTalk/IPX/NetBIOS protocol suites.[68]

It is at the data link layer though that most modern local area networks diverge from the Internet. Whereas Asynchronous Transfer Mode (ATM) or Multiprotocol Label Switching (MPLS) are typical data link protocols for larger networks, Ethernet and Token Ring are typical data link protocols for local area networks. These protocols differ from the former protocols in that they are simpler (e.g. they omit features such as Quality of Service guarantees) and offer collision prevention. Both of these differences allow for more economic set-ups.[69]

Despite the modest popularity of Token Ring in the 80's and 90's, virtually all local area networks now use wired or wireless Ethernet. At the physical layer, most wired Ethernet implementations use copper twisted-pair cables (including the common 10BASE-T networks). However, some early implementations used coaxial cables and some recent implementations (especially high-speed ones) use optic fibres.[70] Where optic fibre is used, the distinction must be made between multi-mode fibre and single-mode fibre. Multi-mode fibre can be thought of as thicker optical fibre that is cheaper to manufacture but that suffers from less usable bandwidth and greater attenuation (i.e. poor long-distance performance).[71]

[edit] Telecommunication by region[show] v • d • e

Telecommunications in EuropeSovereign

states

Albania · Andorra · Armenia1 · Austria · Azerbaijan2 · Belarus · Belgium ·Bosnia and Herzegovina · Bulgaria · Croatia ·Cyprus1 · Czech Republic · Denmark · Estonia · Finland · France · Georgia2 · Germany · Greece · Hungary · Iceland · Ireland · Italy · Kazakhstan3 · Latvia ·Liechtenstein · Lithuania · Luxembourg ·Republic of Macedonia · Malta · Moldova ·Monaco · Montenegro · Netherlands · Norway · Poland · Portugal · Romania · Russia3 · San Marino · Serbia · Slovakia ·Slovenia · Spain · Sweden · Switzerland · Turkey3 · Ukraine · United Kingdom (England • Northern Ireland • Scotland • Wales)

Other entities

European Union · Sovereign Military Order of Malta

Dependencies,

autonomies,

other territories

Abkhazia 2 · Adjara1 · Adygea ·Akrotiri and Dhekelia · Åland · Azores ·Bashkortostan · Catalonia · Chechnya ·Chuvashia · Crimea · Dagestan · Faroe Islands · Gagauzia · Gibraltar · Guernsey ·Ingushetia · Jan Mayen · Jersey ·Kabardino-Balkaria · Kalmykia · Karachay-Cherkessia · Republic of Karelia · Komi Republic ·Kosovo · Madeira · Isle of Man · Mari El · Mordovia · Nagorno-Karabakh1 ·Nakhchivan1 · North Ossetia-Alania · Northern Cyprus1 · South Ossetia 2 · Svalbard · Tatarstan · Transnistria · Udmurtia · Vojvodina

Italics indicates an unrecognised or partially recognised country. 1 Entirely in Asia, but historically considered European. 2 Partially or entirely in Asia, depending on the border definitions. 3 Transcontinental country.[show] v • d • e

Telecommunications in North AmericaSovereign states

Antigua and Barbuda · Bahamas · Barbados ·Belize · Canada · Costa Rica · Cuba ·Dominica · Dominican Republic · El Salvador ·Grenada · Guatemala · Haiti · Honduras · Jamaica · Mexico · Nicaragua ·Panama1 · Saint Kitts and Nevis · Saint Lucia · Saint Vincent and the Grenadines · Trinidad and Tobago1 · United States

Dependencies and

other territories

Anguilla · Aruba1 · Bermuda · British Virgin Islands · Cayman Islands · Greenland ·Guadeloupe · Martinique · Montserrat · Navassa Island · Netherlands Antilles1 · Puerto Rico ·Saint Barthélemy · Saint Martin · Saint Pierre and Miquelon · Turks and Caicos Islands · United States Virgin Islands

1 Territories also in or commonly considered to be part of South America.[show] v • d • e

Telecommunications in South AmericaSovereign states

Argentina · Bolivia · Brazil · Chile · Colombia · Ecuador · Guyana · Panama1 · Paraguay · Peru · Suriname · Trinidad and Tobago1 · Uruguay · Venezuela

Dependencies

Aruba1 / Netherlands Antilles1 (Netherlands) · Falkland Islands / South Georgia and the South Sandwich Islands (UK) 2 / French Guiana (France)

1 Territories also in or commonly considered to be part of North America and/or Central America. 2 Territories also in or commonly considered to be part of Antarctica.[show] v • d • e

Telecommunications in OceaniaSovereign states

Australia · East Timor1 · Fiji · Indonesia1 · Kiribati · Papua New Guinea · Marshall Islands · Federated States of Micronesia · Nauru · New Zealand · Palau · Samoa · Solomon Islands · Tonga · Tuvalu · Vanuatu

Dependencies and

other territories

American Samoa · Christmas Island · Cocos (Keeling) Islands · Cook Islands · French Polynesia · Guam · Hawaii · New Caledonia · Niue · Norfolk Island · Northern Mariana Islands ·Pitcairn Islands · Tokelau · Wallis and Futuna

1 Transcontinental country.[show] v • d • e

Telecommunications in AfricaSovereign states

Algeria · Angola · Benin · Botswana · Burkina Faso · Burundi · Cameroon ·Cape Verde · Central African Republic · Chad ·Comoros · Democratic Republic of the Congo · Republic of the Congo · Côte d'Ivoire (Ivory Coast) · Djibouti · Egypt1 · Equatorial Guinea · Eritrea · Ethiopia · Gabon · The Gambia · Ghana · Guinea · Guinea-Bissau · Kenya ·Lesotho · Liberia · Libya · Madagascar · Malawi · Mali · Mauritania ·Mauritius · Morocco · Mozambique · Namibia · Niger · Nigeria · Rwanda · São Tomé and Príncipe · Senegal · Seychelles · Sierra Leone · Somalia · South Africa · Sudan · Swaziland · Tanzania · Togo · Tunisia · Uganda · Zambia · Zimbabwe

Dependencies,

autonomies,

other territories

Canary Islands / Ceuta / Melilla (Spain) · Madeira (Portugal) · Mayotte / Réunion (France) ·Puntland · St. Helena (UK) · Socotra (Yemen) · Somaliland · Southern Sudan ·Western Sahara · Zanzibar (Tanzania)

Italics indicate an unrecognised or partially recognised country. 1 Transcontinental country.[show] v • d • e

Telecommunications in AsiaSovereign

states

Afghanistan · Armenia1 · Azerbaijan1 ·Bahrain · Bangladesh · Bhutan · Brunei · Burma2 · Cambodia · People's Republic of China · Cyprus1 · East Timor3 · Egypt4 · Georgia4 · India · Indonesia · Iran · Iraq · Israel · Japan · Jordan · Kazakhstan4 · North Korea · South Korea · Kuwait · Kyrgyzstan · Laos · Lebanon · Malaysia · Maldives · Mongolia ·Nepal · Oman · Pakistan · Philippines ·Qatar · Russia4 · Saudi Arabia · Singapore · Sri Lanka · Syria · Tajikistan ·Republic of China5 · Thailand · Turkey4 ·Turkmenistan · United Arab Emirates · Uzbekistan · Vietnam · Yemen

Dependencies,

autonomies,

other territories

Aceh · Adjara1 · Abkhazia1 ·Akrotiri and Dhekelia · Altai · British Indian Ocean Territory · Buryatia · Christmas Island ·Cocos (Keeling) Islands · Guangxi · Hong Kong · Inner Mongolia · Iraqi Kurdistan · Jakarta · Khakassia · Macau · Nagorno-Karabakh· Nakhchivan · Ningxia · Northern Cyprus · Palestine (Gaza Strip · West Bank) · Papua · Sakha · South Ossetia1 · Tibet · Tuva · West Papua · Xinjiang · Yogyakarta

Italics indicates an unrecognised or partially recognised country. 1 Sometimes included in Europe, depending on the border definitions. 2 Officially known as Myanmar. 3 Sometimes included in Oceania, and also known as Timor-Leste. 4 Transcontinental country. 5 Commonly known as Taiwan.[show] v • d • e

Telecommunications in the Caribbean

Anguilla · Antigua and Barbuda · Aruba ·Bahamas · Barbados · British Virgin Islands ·Cayman Islands · Cuba · Dominica · Dominican Republic · Grenada · Guadeloupe · Haiti · Jamaica · Martinique · Montserrat ·Netherlands Antilles · Puerto Rico · St. Barthélemy · St. Kitts and Nevis · St. Lucia · St. Martin · St. Vincent and the Grenadines · Trinidad and Tobago · Turks and Caicos Islands · U.S. Virgin Islands

Belize • Bermuda · Colombia · Costa Rica • French Guiana • Guatemala • Guyana • Honduras • Mexico • Nicaragua • Panama • Suriname · Venezuela ·

[edit] See alsoTelecommunication portal
  • Outline of telecommunication
[edit] References
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[edit] Further reading
  • OECD, Universal Service and Rate Restructuring in Telecommunications, Organisation for Economic Co-operation and Development (OECD) Publishing, 1991. Special:Booksources
[edit] External linksFind more about Telecommunication on Wikipedia's sister projects: Definitions from Wiktionary

Textbooks from Wikibooks

Quotations from Wikiquote

Source texts from Wikisource

Images and media from Commons

News stories from Wikinews

Learning resources from Wikiversity

  • ATIS Telecom Glossary
  • Communications Engineering Tutorials
  • Federal Communications Commission
  • IEEE Communications Society
  • International Telecommunication Union
  • Ericsson's Understanding Telecommunications at archive.org (Ericsson removed the book from their site in Sep 2005)

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