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Digital Radio
Digital radio is the use of digital technology to transmit and/or receive across the radio spectrum
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Wireless Computer Network
A wireless network is a computer network that uses wireless data connections between network nodes.[1] Wireless
Wireless
networking is a method by which homes, telecommunications networks and business installations avoid the costly process of introducing cables into a building, or as a connection between various equipment locations.[2] Wireless
Wireless
telecommunications networks are generally implemented and administered using radio communication
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International Telecommunication Union
The International Telecommunication
Telecommunication
Union (ITU; French: Union Internationale des Télécommunications (UIT)), originally the International Telegraph Union (French: Union Télégraphique Internationale), is a specialized agency of the United Nations
United Nations
(UN) that is responsible for issues that concern information and communication technologies.[1] The ITU coordinates the shared global use of the radio spectrum, promotes international cooperation in assigning satellite orbits, works to improve telecommunication infrastructure in the developing world, and assists in the development and coordination of worldwide technical standards
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DECT
Digital Enhanced Cordless Telecommunications
Digital Enhanced Cordless Telecommunications
(Digital European Cordless Telecommunications), usually known by the acronym DECT, is a standard primarily used for creating cordless telephone systems. It originated in Europe, where it is the universal standard, replacing earlier cordless phone standards, such as 900 MHz CT1 and CT2.[1] Beyond Europe, it has been adopted by Australia, and most countries in Asia
Asia
and South America. North American adoption was delayed by United States radio frequency regulations. This forced development of a variation of DECT, called DECT 6.0, using a slightly different frequency range which makes these units incompatible with systems intended for use in other areas, even from the same manufacturer
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Dedicated Short-range Communications
Dedicated short-range communications are one-way or two-way short-range to medium-range wireless communication channels specifically designed for automotive use[1] and a corresponding set of protocols and standards.Contents1 History 2 Standardization 3 See also 4 References 5 External linksHistory[edit] In October 1999, the United States Federal Communications Commission (FCC) allocated 75 MHz of spectrum in the 5.9 GHz band to be used by intelligent transportation systems (ITS).[2] In August 2008, the European Telecommunications Standards Institute (ETSI) allocated 30 MHz of spectrum in the 5.9 GHz band for ITS.[3] By 2003, it was used in Europe and Japan in electronic toll collection.[4] DSRC systems in Europe, Japan and U.S
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2G
2G (or 2-G) is short for second-generation cellular technology. Second-generation 2G cellular networks were commercially launched on the GSM
GSM
standard in Finland
Finland
by Radiolinja (now part of Elisa Oyj) in 1991.[1] Three primary benefits of 2G networks over their predecessors were that phone conversations were digitally encrypted; 2G systems were significantly more efficient on the spectrum enabling far greater wireless penetration levels; and 2G introduced data services for mobile, starting with SMS text messages. 2G technologies enabled the various networks to provide the services such as text messages, picture messages, and MMS (multimedia messages). All text messages sent over 2G are digitally encrypted, allowing the transfer of data in such a way that only the intended receiver can receive and read it. After 2G was launched, the previous mobile wireless network systems were retroactively dubbed 1G
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Digital TV
Digital television
Digital television
(DTV) is the transmission of television signals, including the sound channel, using digital encoding, in contrast to the earlier television technology, analog television, in which the video and audio are carried by analog signals. It is an innovative advance that represents the first significant evolution in television technology since color television in the 1950s.[1] Digital TV makes more economical use of scarce radio spectrum space; it can transmit multiple channels in the same bandwidth occupied by a single channel of analog television,[2] and provides many new features that analog television cannot. A switchover from analog to digital broadcasting began around 2006 in some countries, and many industrial countries have now completed the changeover, while other countries are in various stages of adaptation
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Radio Spectrum
The radio spectrum is the part of the electromagnetic spectrum with frequencies from 3 Hz to 3 000 GHz (3 THz). Electromagnetic waves in this frequency range, called radio waves, are extremely widely used in modern technology, particularly in telecommunication
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Information
Information
Information
is any entity or form that resolves uncertainty or provides the answer to a question of some kind. It is thus related to data and knowledge, as data represents values attributed to parameters, and knowledge signifies understanding of real things or abstract concepts.[1] As it regards data, the information's existence is not necessarily coupled to an observer (it exists beyond an event horizon, for example), while in the case of knowledge, the information requires a cognitive observer.[citation needed] Information
Information
is conveyed either as the content of a message or through direct or indirect observation
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Voyager Program
The Voyager program
Voyager program
is an American scientific program that employs two robotic probes, Voyager 1
Voyager 1
and Voyager 2, to study the outer Solar System.[1] The probes were launched in 1977 to take advantage of a favorable alignment of Jupiter, Saturn, Uranus
Uranus
and Neptune. Although their original mission was to study only the planetary systems of Jupiter
Jupiter
and Saturn, Voyager 2
Voyager 2
continued on to Uranus
Uranus
and Neptune. The Voyagers now explore the outer boundary of the heliosphere in interstellar space; their mission has been extended three times and they continue to transmit useful scientific data
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Arab World
Major Cities of Arab worldList Cairo Baghdad Riyadh Khartoum Amman Alexandria Kuwait
Kuwait
City Casablanca JeddahThis article contains Arabic text
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Statistical Multiplexing
Statistical multiplexing
Statistical multiplexing
is a type of communication link sharing, very similar to dynamic bandwidth allocation (DBA). In statistical multiplexing, a communication channel is divided into an arbitrary number of variable bitrate digital channels or data streams. The link sharing is adapted to the instantaneous traffic demands of the data streams that are transferred over each channel. This is an alternative to creating a fixed sharing of a link, such as in general time division multiplexing (TDM) and frequency division multiplexing (FDM). When performed correctly, statistical multiplexing can provide a link utilization improvement, called the statistical multiplexing gain. Statistical multiplexing
Statistical multiplexing
is facilitated through packet mode or packet-oriented communication, which among others is utilized in packet switched computer networks
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Deep Space Network
The NASA
NASA
Deep Space Network
Space Network
(DSN) is a worldwide network of US spacecraft communication facilities, located in the United States (California), Spain (Madrid), and Australia (Canberra), that supports NASA's interplanetary spacecraft missions. It also performs radio and radar astronomy observations for the exploration of the solar system and the universe, and supports selected Earth-orbiting missions. DSN is part of the NASA
NASA
Jet Propulsion Laboratory
Jet Propulsion Laboratory
(JPL)
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Interference (communication)
In communications and electronics, especially in telecommunications, interference is anything which modifies, or disrupts a signal as it travels along a channel between a source and a receiver. The term typically refers to the addition of unwanted signals to a useful signal
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Internet Protocol
The Internet
Internet
Protocol (IP) is the principal communications protocol in the Internet protocol suite
Internet protocol suite
for relaying packets across network boundaries. Its routing function enables internetworking, and essentially establishes the Internet. IP has the task of delivering packets from the source host to the destination host solely based on the IP addresses in the packet headers. For this purpose, IP defines packet structures that encapsulate the data to be delivered. It also defines addressing methods that are used to label the datagram with source and destination information. Historically, IP was the connectionless datagram service in the original Transmission Control Program introduced by Vint Cerf
Vint Cerf
and Bob Kahn in 1974; the other being the connection-oriented Transmission Control Protocol (TCP)
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World DMB Forum
The world is the planet Earth
Earth
and all life upon it, including human civilization.[1] In a philosophical context, the "world" is the whole of the physical Universe, or an ontological world (the "world" of an individual). In a theological context, the world is the material or the profane sphere, as opposed to the celestial, spiritual, transcendent or sacred. The "end of the world" refers to scenarios of the final end of human history, often in religious contexts. History of the world
History of the world
is commonly understood as spanning the major geopolitical developments of about five millennia, from the first civilizations to the present
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