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802.11a is an IEEE standard for transmitting data over a wireless network. It uses a 5 GHz frequency band and supports data transfer rates of 54 Mbps, or 6.75 megabytes per second.
The 802.11a standard was released in 1999, around the same time as 802.11b. While 802.11b only supported a data transfer rate of 11 Mbps, most routers and wireless cards at that time were manufactured using the 802.11b standard. Therefore, 802.11b remained more popular than 802.11a for several years. In 2003, the 802.11a standard was superseded by 802.11g, which uses the same 2.4 GHz band as 802.11a, but supports transfer rates of up to 54 Mbps.
NOTE: In order for a an 802.11a connection to take place, each device on the wireless network must support the 802.11a standard. For example, if a base station broadcasts an 802.11a signal, only computers with Wi-Fi cards that support 802.11a will be able to recognize the base station. While many routers are backwards compatible with older standards, it may be necessary to manually configure some routers to work with older 802.11a and 802.11b devices.
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