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The IEEE defines standards for networking. The 802 series of standards covers Ethernet (1M, 10M, 100M, 1G and soon 10G), Token Ring, Token Bus and wireless, which is 802.11.

The original 802.11 standard defined a MAC layer, and three PHY layers: FHSS (frequency hopping spread spectrum) radio, DSSS (direct sequence spread sprectrum) radio and a diffuse infra-red layer. All PHY layers worked at 1Mb, and the two radio versions supported 2Mbit (raw) operation also, both in the 2.4GHz ISM (Industrial, Scientific and Medical) band.

Lucent was a proponent of the DSSS version, and Proxim was pushing the FHSS. Both were selling expensive cards and AccessPoints to corporate users who really wanted them. ;)

802.11b is a revision of the DSSS version to support 5.5Mbit and 11Mbit operation as well as the older 2 and 1Mbit rates.

See also: 802.11, 802.11a and 802.11g.

Back to 802.11

Version 6 (current) modified Tue, 03 Jul 2007 23:11:50 +1000 by gummAY
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