Definition: 802.11a is a WLAN communication standard. 802.11a is one of the wireless Ethernet standards in the 802.11 series.
802.11a wireless networks support a maximum theoretical bandwidth of 54 Mbps. 802.11a transmits radio signals in the frequency range above 5 GHz. This range is “regulated,” meaning that 802.11a gear utilizes frequencies not used by other commercial wireless products like cordless phones. An 802.11a AP transmitter may cover less than one-fourth the area of a comparable 802.11b AP. Brick walls and other obstructions affect 802.11a wireless networks to a greater degree than they do comparable 802.11b networks.