The set of numbers 802.11 refer actually to a family of specifications developed by the IEEE for wireless LAN technology. This specifies an over-the-air interface between a wireless client and a base station or between two wireless clients. More specifically, 802.11b (also referred to as 802.11 High Rate or Wi-Fi) is an extension to 802.11 that applies wireless LANS. 802.11b provides 11 Mbps transmission (with a fallback to 5.5, 2 and 1 Mbps) in the 2.4 GHz band. 802.11b uses only DSSS. 802.11b was a 1999 ratification to the original 802.11 standard, allowing wireless functionality comparable to Ethernet.