Cisco Cisco Aironet 1140 Access Point 디자인 가이드

(Cisco Controller)> show 802.11a

802.11n Status:

    A-MPDU Tx:

        Priority 0............................... Enabled

        Priority 1............................... Disabled

        Priority 2............................... Disabled

        Priority 3............................... Disabled

        Priority 4............................... Disabled

        Priority 5............................... Disabled

        Priority 6............................... Disabled

        Priority 7............................... Disabled

Given that the most recent allocation of spectrum in the 5GHz band was just introduced in mid-2007, a 
number of Wi-Fi clients present in production environments do not actually support connections in the 
UNII-2 Extended Band. This allotment of channels ranging from 100 to 140 is essentially invisible to 
older Wi-Fi clients created before this band was made available for Wi-Fi by the FCC.

As of this writing, the list of clients which do not currently support this band include Cisco’s CB-21AG, 
Intel’s 4965AGN, Intel’s 3945ABG, Intel’s 2915ABG and Apple MacBook Pros with an Atheros card. 
Clients which do support this band include Apple’s iMac (with Broadcom 43xx-series wireless chipsets) 
and Intel’s 5100/5300AGN adapters. Ensure that the latest drivers are installed to leverage these 
channels. Please check with the vendor to ensure support.

In order to ensure that RRM does not utilize any of the UNII-2 Extended channels for automatic channel 
selection, navigate to ‘802.11a -> RRM -> DCA -> DCA Channel List’ and uncheck channels 100 
through 140.