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Communications In North Korea
Telecommunications in North Korea refers to the communication services available in North Korea. North Korea has not fully adopted mainstream Internet technology due to its isolationist policies. Telephone North Korea has an adequate telephone system, with 1.18 million fixed lines available in 2008. However, most phones are only installed for senior government officials. Someone wanting a phone installed must fill out a form indicating their rank, why they want a phone, and how they will pay for it. Most of these are installed in government offices, collective farms, and state-owned enterprises (SOEs), with only perhaps 10 percent controlled by individuals or households. By 1970 automatic switching facilities were in use in Pyongyang, Sinŭiju, Hamhŭng, and Hyesan. A few public telephone booths were beginning to appear in Pyongyang around 1990. In the mid-1990s, an automated exchange system based on an E-10A system produced by Alcatel joint-venture factories in China was ins ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
North Korea
North Korea, officially the Democratic People's Republic of Korea (DPRK), is a country in East Asia. It constitutes the northern half of the Korean Peninsula and shares borders with China and Russia to the north, at the Yalu (Amnok) and Tumen rivers, and South Korea to the south at the Korean Demilitarized Zone. North Korea's border with South Korea is a disputed border as both countries claim the entirety of the Korean Peninsula. The country's western border is formed by the Yellow Sea, while its eastern border is defined by the Sea of Japan. North Korea, like its southern counterpart, claims to be the legitimate government of the entire peninsula and adjacent islands. Pyongyang is the capital and largest city. In 1910, Korea was annexed by the Empire of Japan. In 1945, after the Japanese surrender at the end of World War II, Korea was divided into two zones along the 38th parallel, with the north occupied by the Soviet Union and the south occupied by the Unit ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Digital Signature
A digital signature is a mathematical scheme for verifying the authenticity of digital messages or documents. A valid digital signature, where the prerequisites are satisfied, gives a recipient very high confidence that the message was created by a known sender ( authenticity), and that the message was not altered in transit ( integrity). Digital signatures are a standard element of most cryptographic protocol suites, and are commonly used for software distribution, financial transactions, contract management software, and in other cases where it is important to detect forgery or tampering. Digital signatures are often used to implement electronic signatures, which includes any electronic data that carries the intent of a signature, but not all electronic signatures use digital signatures. [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Microwave Transmission
Microwave transmission is the transmission of information by electromagnetic waves with wavelengths in the microwave frequency range of 300MHz to 300GHz(1 m - 1 mm wavelength) of the electromagnetic spectrum. Microwave signals are normally limited to the line of sight, so long-distance transmission using these signals requires a series of repeaters forming a microwave relay network. It is possible to use microwave signals in over-the-horizon communications using tropospheric scatter, but such systems are expensive and generally used only in specialist roles. Although an experimental microwave telecommunication link across the English Channel was demonstrated in 1931, the development of radar in World War II provided the technology for practical exploitation of microwave communication. During the war, the British Army introduced the Wireless Set No. 10, which used microwave relays to multiplex eight telephone channels over long distances. A link across the English Channel allo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Frequency-division Multiplexing
In telecommunications, frequency-division multiplexing (FDM) is a technique by which the total bandwidth available in a communication medium is divided into a series of non-overlapping frequency bands, each of which is used to carry a separate signal. This allows a single transmission medium such as a microwave radio link, cable or optical fiber to be shared by multiple independent signals. Another use is to carry separate serial bits or segments of a higher rate signal in parallel. The most common example of frequency-division multiplexing is radio and television broadcasting, in which multiple radio signals at different frequencies pass through the air at the same time. Another example is cable television, in which many television channels are carried simultaneously on a single cable. FDM is also used by telephone systems to transmit multiple telephone calls through high capacity trunklines, communications satellites to transmit multiple channels of data on uplink and down ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Intersputnik
The Intersputnik International Organization of Space Communications, commonly known as Intersputnik, is an international satellite communications services organization founded on 15 November 1971, in Moscow by the Soviet Union along with a group of eight formerly socialist states (Poland, Czechoslovakia, East Germany, Hungary, Romania, Bulgaria, Mongolia, and Cuba). The objective was and continues to be the development and common use of communications satellites. It was created as the Eastern Bloc's response to the Western Intelsat organization. As of 2008 the organization has 25 member states, among them the Federal Republic of Germany as the legal successor of the GDR. Intersputnik nowadays is a commercially aligned organization. It operates 12 satellites in orbit and 41 transponders. In June 1997 Intersputnik created the Lockheed Martin Intersputnik (LMI) joint venture together with Lockheed Martin, which built and operated the satellites of the same name. In September 2006, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
STM-1
The STM-1 (Synchronous Transport Module level-1) is the SDH ITU-T fiber optic network transmission standard. It has a bit rate of 155.52 Mbit/s. Higher levels go up by a factor of 4 at a time: the other currently supported levels are STM-4, STM-16, STM-64 and STM-256. Above STM-256 wavelength-division multiplexing (WDM) is commonly used in submarine cabling. Frame structure The STM-1 frame is on the basic transmission format for SDH (Synchronous Digital Hierarchy). An STM-1 frame has a byte-oriented structure with 9 rows and 270 columns of bytes, for a total of 2,430 bytes (9 rows * 270 columns = 2430 bytes). Each byte corresponds to a 64kbit/s channel. Networks: internet, telephony, multimedia : convergences and complemen ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
North Korea-Russia Border
North is one of the four compass points or cardinal directions. It is the opposite of south and is perpendicular to east and west. ''North'' is a noun, adjective, or adverb indicating direction or geography. Etymology The word ''north'' is related to the Old High German ''nord'', both descending from the Proto-Indo-European unit *''ner-'', meaning "left; below" as north is to left when facing the rising sun. Similarly, the other cardinal directions are also related to the sun's position. The Latin word ''borealis'' comes from the Greek '' boreas'' "north wind, north", which, according to Ovid, was personified as the wind-god Boreas, the father of Calais and Zetes. ''Septentrionalis'' is from ''septentriones'', "the seven plow oxen", a name of ''Ursa Major''. The Greek ἀρκτικός (''arktikós'') is named for the same constellation, and is the source of the English word ''Arctic''. Other languages have other derivations. For example, in Lezgian, ''kefer'' can mean ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tumangang
Tumangang-rodongjagu ( ko, 두만강로동자구) is a neighbourhood in Sonbong, Rason, North Korea, near the China–North Korea–Russia tripoint where the borders of the three countries converge. It is also the closest town in North Korea to the border with Russia, being located across the river from the Russian settlement of Khasan and the Chinese settlement of Fangchuancun. The Korea Russia Friendship Bridge connects Tumangang and Khasan and is the sole crossing point on the long North Korea–Russia border The North Korea–Russia border, according to the official Russian definition, consists of of "terrestrial border" and 22.1 km (12 nautical miles) of "maritime border". It is the shortest of the international borders of Russia. Description .... Trains coming from and going to Russia are handled by Tumangang Station. Rason Neighbourhoods in North Korea Korea–Soviet Union relations North Korea–Russia border crossings {{NorthKorea-geo-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Khasan (urban-type Settlement)
Khasan (russian: Хаса́н) is an urban locality (an urban-type settlement) in Khasansky District of Primorsky Krai, Russia. It is located near the tripoint on the Tumen River where the borders of Russia, China and North Korea converge. Population: Geography Khasan is the only Russian-inhabited locality on the border with North Korea. It lies near Lake Khasan and the Tumen River. The border between Russia and North Korea is formed by the river, but the Tumen's course sometimes changes during floods, effectively diminishing the territory of Russia and threatening to flood the settlement of Khasan and the Peschanaya border station. Since 2003, work has been progressing to reinforce the area with rocky soil for protection against erosion by the river. There is an unobtrusive Russian outpost near the border with a large radar array. On the North Korean side of the border lies Tumangang. The closest Chinese town is Fangchuan. Transportation Rail Khasan has a railway statio ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Vladivostok
Vladivostok ( rus, Владивосто́к, a=Владивосток.ogg, p=vɫədʲɪvɐˈstok) is the largest city and the administrative center of Primorsky Krai, Russia. The city is located around the Golden Horn Bay on the Sea of Japan, covering an area of , with a population of 600,871 residents as of 2021. Vladivostok is the second-largest city in the Far Eastern Federal District, as well as the Russian Far East, after Khabarovsk. Shortly after the signing of the Treaty of Aigun, the city was founded on July 2, 1860 as a Russian military outpost on formerly Chinese land. In 1872, the main Russian naval base on the Pacific Ocean was transferred to the city, stimulating the growth of modern Vladivostok. After the outbreak of the Russian Revolution in 1917, Vladivostok was occupied in 1918 by White Russian and Allied forces, the last of whom from Japan were not withdrawn until 1922; by that time the antirevolutionary White Army forces in Vladivostok promptly collapsed, an ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Chongjin
Chŏngjin (; ) is the capital of North Korea's North Hamgyong Province (함경북도) and the country's third largest city. It is sometimes called the ''City of Iron''. History Prehistory According to archaeological findings near the lower areas of the Tumen river,evidence of human living traces back to the paleolithic period. Ancient and medieval history According to the Records of the Grand Historian, the region was where the tribe kingdoms of Buyeo, Mohe, Okjeo, Yilou, Yemaek and Sushen existed. The region later was the territory of Goguryeo. After the fall of Goguryeo in 668, the region was ruled by the Tang dynasty. During the reign of Balhae,the region was under the subdivision donggyeongyongwonbu. The region was under the rule of the Jin dynasty (1115–1234), Jin dynasty and Yuan dynasty after the fall of Balhae by the Liao dynasty, Khitans. Modern history Chongjin was a small fishing village prior to the Japan-Korea Treaty of 1910, Japanese annexation of Korea; ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Moscow
Moscow ( , US chiefly ; rus, links=no, Москва, r=Moskva, p=mɐskˈva, a=Москва.ogg) is the capital and largest city of Russia. The city stands on the Moskva River in Central Russia, with a population estimated at 13.0 million residents within the city limits, over 17 million residents in the urban area, and over 21.5 million residents in the metropolitan area. The city covers an area of , while the urban area covers , and the metropolitan area covers over . Moscow is among the world's largest cities; being the most populous city entirely in Europe, the largest urban and metropolitan area in Europe, and the largest city by land area on the European continent. First documented in 1147, Moscow grew to become a prosperous and powerful city that served as the capital of the Grand Duchy that bears its name. When the Grand Duchy of Moscow evolved into the Tsardom of Russia, Moscow remained the political and economic center for most of the Tsardom's history. Whe ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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