DFS - Dynamic Frequency Selection
TPC - Transmitter Power Control
5GHz radio devices should follow 802.11h specification - DFS and TPC
UNII2 - (52, 56, 60, 64 ==> 5250MHz - 5350MHz)
UNII2 Ext - (100, 104, 108, 112, 116, 120, 124, 128, 132, 136, 140 ==> 5470MHz - 5725MHz)
FCC Rule requires that products operating in the UNII-2 and UNII-2 extended bands must support Dynamic Frequency Selection (DFS), to detect and automatically adjusts channels to protect WLAN communications from interfering with military or weather radar systems.
Reference:
http://en.wikipedia.org/wiki/List_of_WLAN_channels
http://www.intel.com/support/wireless/sb/CS-025343.htm
white_paper_80211n_design_and_deployment_guidelines.html
Cisco - FCC Regulations Update
wiki - ETSI
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