Cisco WAP371 Administration Manual page 63

Wireless
Radio
STEP 5
Cisco Small Business WAP371 Wireless Access Point Administration Guide
• 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 20/40 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).
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.
For radios in the 5 GHz band, when DFS support is on and the regulatory domain
requires radar detection on the channel, the Dynamic Frequency Selection (DFS) and
Transmit Power Control (TPC) features of 802.11h are activated.
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