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Global System for Mobile Communications
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ISBN10: 6132557016
ISBN13: 9786132557018
Publisher: Alphascript Pub
Pages: 116
Weight: 0.40
Height: 0.28 Width: 9.02 Depth: 6.00
Language: French
ISBN13: 9786132557018
Publisher: Alphascript Pub
Pages: 116
Weight: 0.40
Height: 0.28 Width: 9.02 Depth: 6.00
Language: French
High Quality Content by WIKIPEDIA articles! Le Global System for Mobile Communications (GSM) (historiquement - Groupe special mobile -) est une norme numerique de seconde generation pour la telephonie mobile. Elle fut etablie en 1982 par la Conference europeenne des administrations des postes et telecommunications (CEPT). Elle a ete mise au point par l'ETSI sur la gamme de frequence des 900MHz. Une variante appelee Digital Communication System (DCS) utilise la gamme des 1800MHz. Cette norme est particulierement utilisee en Europe, en Afrique, au Moyen-Orient et en Asie. Deux autres variantes, en 850MHz et en 1900MHz (PCS), sont egalement utilisees. La protection des donnees est assuree par les algorithmes de chiffrement A5/1 et A5/2. Une norme GSM-400, utilisant les frequences de 450MHz ou 480MHz, est egalement a l'etude en 2009.
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