Wireless LAN technologies, employing the GHz transmission spectrum, conforming to IEEE specifications. There are several current sub categories – 802.11a, 802.11b and 802.11g. 802.11b uses 2.4GHz and a maximum data rate of 11 Mbps. It is quite a bit slower than the 100Mbps or 1Gbps of a wired LAN system, but is still useful in small offices or for home applications. The 802.11a uses a 5 GHz signal/carrier and allows a rate of up to 54Mbps. The 802.11g uses a signal carrier similar to the 802.11b – 2.4Gbps, but allows for data rates of 54Mbps, like the “a” version. The last word on wireless LAN technology has not been said yet, and there is continuous evolution in this field. New proposed standards are 802.11e – which defines QOS (Quality Of Service) and 802.11i – which offers higher security levels. The high speed, next generation wireless LAN is called 802.11n, allowing 100-320Mbps data throughput.
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