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Cisco Wireless LAN Controller Configuration Guide
OL-17037-01
Chapter 11 Configuring Radio Resource ManagementWireless Device Access
Overriding RRM
Figure 11-8 802.11a/n Cisco APs > Configure Page
Step 3
To be able to assign primary and extension channels to the access point radio, choose Custom for the
Assignment Method under RF Channel Assignment.
Step 4 Choose one of the following options from the Channel Width drop-down box:
• 20 MHz—Allows the radio to communicate using only 20-MHz channels. Choose this option for
legacy 802.11a radios, 20-MHz 802.11n radios, or 40-MHz 802.11n radios that you want to operate
using only 20-MHz channels. This is the default value.
• 40 MHz—Allows 40-MHz 802.11n radios to communicate using two adjacent 20-MHz channels
bonded together. The radio uses the primary channel that you choose in Step 6 as well as its
extension channel for faster throughput. Each channel has only one extension channel (36 and 40
are a pair, 44 and 48 are a pair, and so on). For example, if you choose a primary channel of 44, the
controller would use channel 48 as the extension channel. Conversely, if you choose a primary
channel of 48, the controller would use channel 44 as the extension channel.
Note Cisco recommends that you do not configure 40-MHz channels in the 2.4-GHz radio band
because severe co-channel interference can occur.
Note The Channel Width parameter can be configured for 802.11a/n radios only if the RF channel
assignment method is in custom mode and for 802.11b/g/n radios only if both the RF channel
assignment method and the Tx power level assignment method are in custom mode.
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