Cisco Cisco Access Registrar 4.2 Spécifications télécharger pdf (Page 114)

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Cisco Wireless LAN Controller Configuration Guide

OL-13826-01

Chapter 4 Configuring Controller SettingsWireless Device Access

Configuring 802.11n Parameters

e. To convert the channel bandwidth of the radio that is configured for 802.11n support from 20 MHz

to 40 MHz, enter this command:

config 802.11a chan_width Cisco_AP {20 | 40_ABOVE | 40_BELOW}

where

• 20 specifies the default 20-MHz bandwidth. You can use this option to revert the channel

bandwidth from 40 MHz back to 20 MHz.

• 40_ABOVE specifies a 40-MHz bandwidth with the secondary or extension channel in the

upper 20-MHz band. Two 20-MHz channels are combined to create the wireless network with

the channel above the current channel used for control messages.

• 40_BELOW specifies a 40-MHz bandwidth with the secondary or extension channel in the

lower 20-MHz band. Two 20-MHz channels are combined to create the wireless network with

the channel below the current channel used for control messages.

By increasing the channel bandwidth from 20 to 40 MHz, you can increase the throughput of the

wireless network.

Note 802.11n access points are configured to operate at 20 MHz by default. If they are configured

to operate at 40 MHz, the transmit power and channel assignment must be statically enabled.

Note When the 40-MHz channel bandwidth is used, channels can be combined only in pairs of

two. For example, of the available channels 36, 40, 44, 48, 52, 56, 60, and 64, only pairs of

36 & 40, 44 & 48, 52 & 56, and 60 & 64 are allowed to be combined. If the current channel

for the 802.11a radio is set to 40 and you want to set the channel bandwidth to 40 MHz with

the ABOVE option, the controller does not allow for this because it would break the pairing.

Only the BELOW option can be used. If you want to use the ABOVE option, then the

802.11a radio must be set to use channel 36.

Note If the channel bandwidth is set to 40 MHz and you try to set a channel number on the

controller GUI that breaks the channel pairing described in the previous note, an error

message appears, and the channel is not set.

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.

f. To re-enable the network, enter this command:

config 802.11a enable network

g. To re-enable the access point, enter this command:

config 802.11a enable Cisco_AP

Step 7 To save your changes, enter this command:

save config

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