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The IEEE define 802.11 standard includes a common Medium Access Control (MAC) Layer, which defines protocols that govern the operation of the wireless LAN. In addition, 802.11 comprises several alternative physical layers that specify the transmission and reception of 802.11 frames. Let's take a closer look at the 802.11b Physical Layer, which uses direct sequence spread spectrum (DSSS) technology to support operation of up to 11Mbps data rates in the 2.4GHz band.

As with other 802.11 Physical layers, 802.11b includes Physical Layer Convergence Procedure (PLCP) and Physical Medium Dependent (PMD) sub-layers. These are somewhat sophisticated terms that the standard uses to divide the major functions that occur within the Physical Layer. The PLCP prepares 802.11 frames for transmission and directs the PMD to actually transmit signals, change radio channels, receive signals, and so on

Data Rate Modulation Technology
11Mbps CCK
5.5Mbps CCK
2 Mbps QPSK
1 Mbps BPSK

Version 3 (current) modified Tue, 03 Jul 2007 23:12:18 +1000 by gummAY
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