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Dynamic Frequency Selection (DFS) allows an IEEE 802.11a access point (AP) to use radio channels in the frequency range normally reserved for radar systems. Radar uses radio signals to determine the location of objects for military, meteorological or air traffic control purposes. As long as the DFS-enabled AP detects no radar activity on the selected channel, it uses the channel to communicate. If it detects radar activity on the selected channel, it automatically instructs its wireless clients to move to another channel, then resumes communications on the new channel.