Hi Hitesh,
Check out this excerpt from the 1121g AP Installation guide section on enabling the 802.11b and 802.11g radios.
In Cisco IOS Release 12.3(4)JA and later, the access point radios are disabled by default, and there is no default SSID. You must create an SSID and enable the radios before the access point will allow wireless associations from other devices. These changes to the default configuration improve the security of newly installed access points. Refer to the "Configuring Basic Security Settings" section for instructions on configuring the SSID.
In Cisco IOS Release 12.3(2)JA or earlier, the access point radio is enabled by default, and the default SSID is tsunami.
To enable the radio interfaces, follow these instructions:
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Step 1 Use your web-browser to access your access point.
Step 2 When the Summary Status page displays, click Network Interfaces > Radio0-802.11B or Radio0-802.11G and the radio status page displays.
Step 3 Click Settings and the radio settings page displays
Step 4 Click Enable in the Enable Radio field.
Step 5 Click Apply.
Here is a link to the actual document:
http://www.cisco.com/en/US/products/hw/wireless/ps4570/products_installation_guide_chapter09186a00804d2b73.html
Hope this helps!
Rob
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