ok.. lets start to Rig the product ID..
your Product ID is AIR-AP1131G-A-K9
AIR - Aironet (Company which Got acquired by Cisco)
AP - Access Point
1131 - Product number (One amoung the Aironet family product)
G - Radio Supported.. (if you wanted int dot11 1 to be present, then the Model Number will be AG)
A - America (Country Code)
K9 - Encryption.
So if you want the A radio to be der.. then the complete product id will be AIR-AP1131AG-A-K9 not AIR-AP1131G-A-K9
here is the link as well..
http://www.cisco.com/en/US/prod/collateral/wireless/ps5678/ps6087/product_data_sheet0900aecd801b901c.html
Lemme know how if this answered your question..
Regards
Surendra
Regards
Surendra BG