802.11b
To increase throughput over the original 802.11-1997 standard, 802.11b was introduced in 1999. It offered data rates of 5.5 and 11 Mbps through the use of Complementary Code Keying (CCK). Because 802.11b was based on DSSS and was used in the 2.4-GHz band, it was backward compatible with the original standard. Devices could select either 1, 2, 5.5, or 11 Mbps by simply changing the modulation and coding schemes. Table 2-8 lists the new data rates introduced in 802.11b.
Table 2-8 IEEE 802.11b Data Rates
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