Cisco Aironet 1200 Series Upgrade Manual page 3

The 5-GHz radio module is available in three versions:
•
Low power IEEE 802.11a radio module with integrated antenna (RM20A
radio module)
• Enhanced IEEE 802.11a radio module with dual integrated antennas
(RM21A radio module)
– Requires Cisco IOS Release 12.3(2)JA or later.
•
Enhanced IEEE 802.11a radio module with dual external RP-TNC
antenna connectors (RM22A radio module)
– Requires Cisco IOS Release 12.3(2)JA or later.
Tip
If you are upgrading to an 802.11g radio or an RM21A or RM22A
radio module, make sure you are running the correct Cisco IOS
version before you install the radio or module. If your access point
is running an earlier version, it will not recognize the radio or
module and continually boot.
All 5-GHz radios incorporate an Unlicensed National Information Structure
(UNII) radio transceiver operating in the UNII 5-GHz frequency bands.
The upgrade procedures are identical for either version.
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