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URL:
http://www.wirelessethernet.org/OpenSection/index.asp
This standard provides wireless connectivity to
mobile or portable equipment within a LAN area. The IEEE 802.11 standard
specifies both the physical (PHY) and medium access control (MAC) layers of the
network. The physical layer can use either direct sequence spread spectrum,
frequency hopping spread spectrum, or infrared (IR) pulse position modulation.
The MAC layer specifies CSMA/CA protocol. Security is one of the major concerns
of wireless LANs in general and this technology in particular. IEEE 802.11a and
802.11b have data rate of 55 and 11 Mbps respectively. IEEE 802.11b is
currently in widespread use. Wireless Fidelity (WIFI) Alliance certifies
interoperability of WIFI technology product using 802.11b.
Keywords:
LAN, wireless, Physical layer, MAC layer, spread-spectrum, infrared, mobile
computing.
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