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Telephone Exchange
A telephone exchange is a telecommunications system used in the public switched telephone network or in large enterprises. An exchange consists of electronic components and in older systems also human operators that interconnect (switch) telephone subscriber lines or virtual circuits of digital systems to establish telephone calls between subscribers. In historical perspective, telecommunication terms have been used with different semantics over time. The term telephone exchange is often used synonymously with central office (CO), a Bell System
Bell System
term. Often, a central office is defined as a building used to house the inside plant equipment of potentially several telephone exchanges, each serving a certain geographical area. Such an area has also been referred to as the exchange
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Antwerp
Antwerp
Antwerp
(/ˈæntwɜːrp/ ( listen), Dutch: Antwerpen [ˈɑntʋɛrpə(n)] ( listen), French: Anvers [ɑ̃vɛʁ(s)]) is a city in Belgium, and is the capital of Antwerp province in Flanders. With a population of 520,504,[2] it is the most populous city proper in Belgium. Its metropolitan area houses around 1,200,000 people, coming in second behind Brussels.[3][4] Antwerp
Antwerp
is on the River Scheldt, linked to the North Sea
North Sea
by the Westerschelde estuary
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Multiplexer
In electronics, a multiplexer (or mux) is a device that selects one of several analog or digital input signals and forwards the selected input into a single line.[1] A multiplexer of 2 n displaystyle 2^ n inputs has n displaystyle n select lines, which are used to select which input line to send to the output.[2] Multiplexers are mainly used to increase the amount of data that can be sent over the network within a certain amount of time and bandwidth.[1] A multiplexer is also called a data selector. Multiplexers can also be used to implement Boolean functions of multiple variables. An electronic multiplexer makes it possible for several signals to share one device or resource, for example, one A/D converter
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Berlin
Berlin
Berlin
(/bɜːrˈlɪn/, German: [bɛɐ̯ˈliːn] ( listen)) is the capital and the largest city of Germany, as well as one of its 16 constituent states. With a steadily growing population of approximately 3.7 million,[4] Berlin
Berlin
is the second most populous city proper in the European Union
European Union
behind London
London
and the seventh most populous urban area in the European Union.[5] Located in northeastern Germany
Germany
on the banks of the rivers Spree
Spree
and Havel, it is the centre of the Berlin- Brandenburg
Brandenburg
Metropolitan Region, which has roughly 6 million residents from more than 180 nations.[6][7][8][9] Due to its location in the European Plain, Berlin
Berlin
is influenced by a temperate seasonal climate
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Boston
Boston
Boston
(/ˈbɒstən/ ( listen) BOS-tən) is the capital city and most populous municipality[9] of the Commonwealth of Massachusetts in the United States
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London
London
London
(/ˈlʌndən/ ( listen)) is the capital and most populous city of England
England
and the United Kingdom.[7][8] Standing on the River Thames
River Thames
in the south east of the island of Great Britain, London has been a major settlement for two millennia. It was founded by the Romans, who named it Londinium.[9] London's ancient core, the City of London, largely retains its 1.12-square-mile (2.9 km2) medieval boundaries
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Manchester
Coordinates: 53°28′46″N 2°14′43″W / 53.47944°N 2.24528°W / 53.47944; -2.24528Manchester City
City
and Metropolitan boroughClockwise from top: Skyline of Manchester
Manchester

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Hungary
Coordinates: 47°N 20°E / 47°N 20°E / 47; 20Hungary Magyarország  (Hungarian)FlagCoat of armsAnthem: "Himnusz" (Hungarian)[1] "Hymn"Location of  Hungary  (dark green) – in Europe  (green & dark grey) – in the European Union  (green)  –  [Legend]Capital and largest city Budapest 47°26′N 19°15′E / 47.433°N 19.250°E / 47.433; 19.250Official language and national language Hungarian[2]Ethnic groups (2011)80.7% Hungarians 14.7% not declared 3.1% Roma 1.3% Germans[3]Religion52.9% Christianity –38.9% Catholicism –13.7% Protestantism –0.1% Orthodox Church 0.1% Judaism 1.7% other 18.2% not religious 27.2% unanswered[4]Demonym HungarianGovernment Unitary parliamentary constitutional republic• PresidentJános Áder• Prime MinisterViktor O
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Broadband
In telecommunications, broadband is wide bandwidth data transmission which transports multiple signals and traffic types. The medium can be coaxial cable, optical fiber, radio or twisted pair. In the context of Internet access, broadband is used to mean any high-speed Internet access
Internet access
that is always on and faster than dial-up access over traditional analog or ISDN
ISDN
PSTN services.Contents1 Overview 2 Broadband
Broadband
technologies2.1 Telecommunications 2.2 Computer networks 2.3 TV and video 2.4 Alternative technologies3 Internet broadband3.1 Global bandwidth concentration4 See also 5 ReferencesOverview[edit] Different criteria for "broad" have been applied in different contexts and at different times
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Model (abstract)
A conceptual model is a representation of a system, made of the composition of concepts which are used to help people know, understand, or simulate a subject the model represents. It is also a set of concepts. Some models are physical objects; for example, a toy model which may be assembled, and may be made to work like the object it represents. The term conceptual model may be used to refer to models which are formed after a conceptualization or generalization process.[1] Conceptual models are often abstractions of things in the real world whether physical or social. Semantic studies are relevant to various stages of concept formation
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TRS Connector
A phone connector, also known as phone jack, audio jack, headphone jack or jack plug, is a family of electrical connectors typically used for analog audio signals. The phone connector was invented for use in telephone switchboards in the 19th century and is still widely used. The phone connector is cylindrical in shape, with a grooved tip to retain it. In its original audio configuration, it typically has two, three, four and, occasionally, five contacts. Three-contact versions are known as TRS connectors, where T stands for "tip", R stands for "ring" and S stands for "sleeve". Ring contacts are typically the same diameter as the sleeve, the long shank. Similarly, two-, four- and five- contact versions are called TS, TRRS and TRRRS connectors respectively. The outside diameter of the "sleeve" conductor is 1⁄4 inch (6.35 millimetres)
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Charles Glidden
Charles is a masculine given name from the French form Charles of a Germanic name Karl. The original Anglo-Saxon was Ċearl or Ċeorl, as the name of King Cearl of Mercia, that disappeared after the Norman conquest of England. The corresponding Old Norse form is Karl, and the German form is also Karl
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Subscriber
The subscription business model is a business model where a customer must pay a subscription price to have access to a product or service. The model was pioneered by magazines and newspapers, but is now used by many businesses and websites.Contents1 Subscriptions1.1 Types2 Effects2.1 Vendors 2.2 Customers2.2.1 Legal2.3 Environment3 See also 4 ReferencesSubscriptions[edit] Rather than selling products individually, a subscription sells periodic (monthly or yearly or seasonal) use or access to a product or service, or, in the case of such non-profit organizations as opera companies or symphony orchestras, it sells tickets to the entire run of some set number of (eg., five to fifteen) scheduled performances for an entire season. Thus, a one-time sale of a product can become a recurring sale and can build brand loyalty
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Calling Party
The calling party (in some contexts called the "A-Number") is a person who (or device that) initiates a telephone call. The person who, or device that, receives a telephone call is the called party. In some countries, it is common etiquette for a call originator to identify himself first instead of the receiver, when the connection is established. Modems and fax machines use different tones when originating or answering a connection, which may be a source of problems for the user. See also[edit]Calling-party camp-onThis article related to telephony is a stub
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Kansas City, Missouri
Kansas
Kansas
City
City
is the largest city in Missouri, United States. According to the U.S. Census Bureau, the city had an estimated population of 481,420 in 2016,[6] making it the 37th largest city by population in the United States. It is the central city of the Kansas
Kansas
City metropolitan area, which straddles the Kansas– Missouri
Missouri
border. Kansas
Kansas
City
City
was founded in the 1830s as a Missouri
Missouri
River port at its confluence with the Kansas
Kansas
River coming in from the west. On June 1, 1850 the town of Kansas
Kansas
was incorporated; shortly after came the establishment of the Kansas
Kansas
Territory
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On-hook
In telephony, the term on-hook has the following meanings:On hook telephone handsetThe condition that exists when a telephone or other user instrument is not in use, i.e., when idle waiting for a call. Note: on-hook originally referred to the storage of an idle telephone receiver, i.e., separate earpiece, on a switchhook. The weight of the receiver depresses the spring-loaded switchhook thereby disconnecting the idle instrument (except its bell) from the telephone line. One of two possible signaling states, such as tone or no tone, or ground connection versus battery connection. Note: if on-hook pertains to one state, off-hook pertains to the other. The idle state, i.e., an open loop of a subscriber line or PBX user loop. An operating state of a telecommunication circuit in which transmission is disabled and a high impedance, or "open circuit", is presented to the link by the end instrument(s)
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