With 802.11 wireless LANs (WLANs), an AP (AP) is set to a specific radio frequency (RF) channel. As part of the association process, each user’s wireless network interface card scans all channels, detects the AP, and then tunes to the channel of the AP to complete a connection. In order to deploy an effective wireless network, each adjacent AP within range of another should be set to different, non-overlapping RF channels. This minimizes contention between users and the additional overhead of beacons coming from multiple APs, while improving performance. With 2.4GHz wireless LANs (802.11b and 802.11g), these channels are 1, 6, and 11. In the 5GHz band (802.11a), the channels don’t overlap, so you’re free to use any of them.
Via [wi-fiplanet.com]
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