Wireless
Radio
Cisco WAP571/E Administration Guide 73
5
• Channel Bandwidth (802.11n and 802.11ac modes only)—The 802.11n
specification allows a 40-MHz-wide channel in addition to the legacy 20-
MHz channel available with other modes. The 40-MHz channel enables
higher data rates but leaves fewer channels available for use by other 2.4
GHz and 5 GHz devices.
The 802.11ac specification allows an 80-MHz-wide channel in addition to
the 20-MHz and 40-MHz channels.
Set the field to 20-MHz to restrict the use of the channel bandwidth to a 20-
MHz channel. For the 802.11ac mode, set the field to 40-MHz to prevent the
radio from using the 80 MHz channel bandwidth.
• Primary Channel (802.11n modes with 20 or 40 MHz bandwidth only)—A
40 MHz channel can be considered to consist of two 20-MHz channels that
are contiguous in the frequency domain. These two 20-MHz channels are
often referred to as the Primary and Secondary channels. The Primary
Channel is used for 802.11n clients that support only a 20-MHz channel
bandwidth and for legacy clients.
Select one of these options:
- Upper—Sets the Primary Channel as the upper 20-MHz channel in the
40-MHz band.
- Lower—Sets the Primary Channel as the lower 20-MHz channel in the
40-MHz band. Lower is the default selection.
• Channel—The portion of the radio spectrum the radio uses for transmitting
and receiving.
The range of available channels is determined by the mode of the radio
interface and the country code setting. If you select Auto for the channel
setting, the WAP device scans available channels and selects a channel
where the least amount of traffic is detected.
Each mode offers a number of channels, depending on how the spectrum is
licensed by national and transnational authorities such as the Federal
Communications Commission (FCC) or the International Telecommunication
Union (ITU-R).
• Spectrum Analysis Mode—The Spectrum Analysis Mode status. The status
is either Dedicated Spectrum Analyzer or Disable. The default is Disable.
STEP 5 In the Advanced Settings area, configure these settings:
• DFS Support—This field is available only if the selected radio mode
operates in the 5-GHz frequency.
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