In order to overcome this problem, issue the config ap power injector enable <Ap name as shown on the controller> installed command on the controller that is connected with this AP. This command is available from controller version 3.2.116.21. Ensure that you use the correct version in the controller.
This command specifies that a power injector is used in order to supply sufficient power to the AP.
Aironet 1240 AG Series APs
The Aironet 1240 AG Series AP ships with a 100− to 240−VAC power supply that provides 48 VDC to locally power the AP. You can order the Aironet 1240 AG series to ship without the power supply. If you intend to power the AP from an inline power−capable switch, you do not require the power supply.
Note: The power injector does not come with a power supply. Instead, the power injector uses the power supply from the AP. If you intend to use the power injector, be sure that the power supply is included with your AP. If you previously ordered the AP without a power supply, you need to order a spare power supply in order to use the power injector.
Aironet 1250 AG Series APs
The Cisco Aironet 1250 Series is an enterprise−class 802.11n access point designed for challenging RF environments. A dual−band rugged indoor access point, the 1250 Series supports data rates of up to 600 Mbps to provide users with reliable and predictable coverage for high−bandwidth data, voice, and video applications. 1250 series APs can be powered using these devices:
∙Cisco Catalyst switch port capable of sourcing 20W or greater
∙Cisco AP1250 Power Injector (AIR−PWRINJ4)
∙Cisco AP1250 Local Power Supply (AIR−PWR−SPLY1)
∙802.3af switch (AP1250 with single radio only)