July 2011
Intermediate to advanced
1240 pages
37h 23m
French
Content preview from Les réseaux
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22Les réseaux Wi-Fi
La norme IEEE 802.11 a donné lieu à trois types de réseaux sans fil, ceux qui travaillent à la vitesse de 11 Mbit/s, ceux à 54 Mbit/s et ceux à 600 Mbit/s. Les premiers se fondent sur la norme IEEE 802.11b, les deuxièmes sur les normes IEEE 802.11a et g et les troisièmes sur la norme IEEE 802.11n. À ces trois générations vont succéder deux nouvelles générations : IEEE 802.11ac, à 2 Gbit/s, et IEEE 802.11af, qui pourrait atteindre 10 Gbit/s.
Pour le premier type, les fréquences choisies se situent dans la gamme des 2,4 GHz. Dans cette solution de réseau local par voie hertzienne, les communications peuvent se faire soit directement de station à station, mais sans qu’une station puisse relayer les paquets vers une autre station ...
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