Cisco Cisco Aironet 1250 Series Access Point Guía De Instalación

The access point has two radio module slots: Slot 0 and Slot 1. Slot 0 can only 
be used with the 2.4-GHz radio module and slot 1 can only be used with the 
5-GHz radio module. 

2.4 GHz

5 GHz

Draft 802.11n, version 2.0

 shows the access point with 2.5-GHz and 5-GHz radio modules 

installed.