Cisco Cisco Aironet 1250 Series Access Point Installationsanleitung

Radio modules can be initially placed in any slot before the radios are 
configured with non-default parameters. New radio configuration changes are 
associated with the module slot in which the radio module is located.

When the default radio settings are changed, the radio modules should not be 
moved to a different slot. After configuration changes are made, moving the 
radio modules to a different module slot requires that you reconfigure the 
radio settings for that slot.

The access point supports single- or dual-radio operation. Each radio uses 
dual-diversity antennas. A blank module is available for single-radio 
configurations.

The 5-GHz radio incorporates an Unlicensed National Information 
Infrastructure (UNII) radio transceiver operating in the UNII 5-GHz 
frequency bands.

 shows a typical radio module.