Communication sans fil

Définitions Wikipedia

La transmission sans fil est un mode de communication à distance utilisant des ondes électromagnétiques modulées comme vecteur. Avec celles-ci, les distances peuvent être courtes — quelques mètres pour le Bluetooth —, voire correspondre à des millions de kilomètres pour le réseau de communications avec l'espace lointain de la NASA. Les applications les plus courantes de la transmission sans fil incluent les téléphones portables, les GPS, les souris et les claviers d’ordinateur, les réseaux informatiques étendus (les WAN), les casques audio, les récepteurs radio et la télévision par satellite. Dans certaines gammes de fréquences (micro-ondes et radiofréquences faisant partie des rayonnements non ionisants, leurs effets biologiques et environnementaux, à certaines fréquences et intensités sont très discutés, en raison des résultats contradictoires de nombreuses études entreprises en lien avec le développement des communications sans fil et de la 5G).[pas clair]

Source : http://fr.dbpedia.org/resource/Transmission_sans_fil

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Wireless communication (or just wireless, when the context allows) is the transfer of information between two or more points without the use of an electrical conductor, optical fiber or other continuous guided medium for the transfer. The most common wireless technologies use radio waves. With radio waves, intended distances can be short, such as a few meters for Bluetooth or as far as millions of kilometers for deep-space radio communications. It encompasses various types of fixed, mobile, and portable applications, including two-way radios, cellular telephones, personal digital assistants (PDAs), and wireless networking. Other examples of applications of radio wireless technology include GPS units, garage door openers, wireless computer mouse, keyboards and headsets, headphones, radio receivers, satellite television, broadcast television and cordless telephones. Somewhat less common methods of achieving wireless communications involve other electromagnetic phenomena, such as light and magnetic or electric fields, or the use of sound. The term wireless has been used twice in communications history, with slightly different meaning. It was initially used from about 1890 for the first radio transmitting and receiving technology, as in wireless telegraphy, until the new word radio replaced it around 1920. Radio sets in the UK and the English-speaking world that were not portable continued to be referred to as wireless sets into the 1960s. The term wireless was revived in the 1980s and 1990s mainly to distinguish digital devices that communicate without wires, such as the examples listed in the previous paragraph, from those that require wires or cables. This became its primary usage in the 2000s, due to the advent of technologies such as mobile broadband, Wi-Fi and Bluetooth. Wireless operations permit services, such as mobile and interplanetary communications, that are impossible or impractical to implement with the use of wires. The term is commonly used in the telecommunications industry to refer to telecommunications systems (e.g. radio transmitters and receivers, remote controls, etc.) which use some form of energy (e.g. radio waves and acoustic energy) to transfer information without the use of wires. Information is transferred in this manner over both short and long distances.

Source : http://dbpedia.org/resource/Wireless

Sources externes

Wikidata : Q249
DBpedia FR : Transmission_sans_fil
DBpedia EN : Wireless

Autres langues (Wikipedia)

اتصال لاسلكي (arwiki)
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ကြိုးမဲ့ဆက်သွယ်ရေး (mywiki)
Draadloze communicatie (nlwiki)
Comunicações sem fio (ptwiki)
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