Channels for 802.11a

The 802.11a standard uses the same core protocol as the original standard, operates in 5 GHz band, and uses a 52-subcarrier OFDM (Orthogonal Frequency Division Multiplexing) with a maximum raw data rate of 54 Mbit/s, which yields realistic net achievable throughput in the mid-20 Mbit/s. The data rate is reduced to 48, 36, 34, 18, 12, 9 then 6 Mbit/s if required.

Although there are 12 official channels allocated on 802.11a there are actually 18 channels in total, 11 channels can be considered indoor due power limits (Aircraft radar issues) and another 7 which are usable for Community(Outdoor)use.

Note *In Turbo Mode (108Mb) there is only 3 indoor and 2 outdoor channels