Hi Leopoldo,

Frequency band and operating channels (2.4 GHz and 5.0 GHz)

Americas (FCC)

• 2.412 to 2.462 GHz; 11 channels

• 5.15 to 5.35, 5.725 to 5.825 GHz; 12 channels

ETSI

• 2.412 to 2.472 GHz; 13 channels

• 5.15 to 5.725 GHz; 19 channels

Nonoverlapping Channels (FCC and ETSI)

802.11a: FCC = 12 ETSI = 19 (36,40,44,48,52,56,60,149,153,157 and 161)

802.11b/g: 3 (1,6 and 11)

http://www.cisco.com/en/US/products/ps6087/products_data_sheet0900aecd801b9058.html

http://www.cisco.com/en/US/products/ps6087/products_white_paper0900aecd8027a5f7.shtml

Hope this helps!

Rob