The IEEE approved a second standard in 1999. IEEE 802.11a provides a maximum 54-Mbps data rate but is incompatible with 802.11b. It provides speeds of 54, 48, 36, 24, 18, 12, 9, and 6 Mbps. IEEE 802.11a uses 13 channels of the Unlicensed National Information Infrastructure (UNII) frequencies and is incompatible with 802.11b and 802.11g. IEEE 802.11a is also known as WiFi5.
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