This visualization shows what
type of channel bandwidth (also called channel
width) is being used in
the given WLAN area. Wi-Fi networks use three types of channel
Legacy: This is a legacy type used by 802.11 a/b/g equipment. Each
channel occupies 20 MHz of radio spectrum.
HT and 40 MHz HT: These are bandwidth types introduced in the
802.11n standard. They occupy either 20 MHz or 40 MHz of spectrum
space and use HT-mixed and HT-Greenfield
VHT, 40 MHz VHT, 80 MHz VHT, and 160 MHz VHT: These are new types
introduced in the 802.11ac standard. They use 20, 40, 80, or 160
MHz-wide channels. VHT is used only in the 5 GHz band.
Channel bandwidth is shown for
the AP that has the strongest signal in the given map area among
the APs selected for analysis. This mimics the roaming behavior of
client adapters that connected to the strongest AP. While other
audible APs may offer other types of bandwidth, a typical adapter
will connect to the AP with the strongest signal. You can deselect
one or several of the selected APs to see channel bandwidth types
for less strong APs.
Double-clicking on the Channel
Bandwidth legend on the status bar allows you to configure the
color scheme and change its value range.
If you see 20 MHz Legacy or 20
MHz HT channel bandwidth in the areas where you expect to see 40
MHz HT, the following solutions are suggested:
your AP configuration. If you are using newer 802.11n equipment,
make sure that it is configured to use 40 MHz or automatic 20/40
MHz channel width.
AP's ability to use 40 MHz channels depends on the wireless
environment. A 40 MHz-enabled AP may fall back to 20 MHz mode in
some situations (e.g., when an 802.11n client that does not support
40 MHz bandwidth is connected). Because of the changing
environment, the site survey results regarding the channel
bandwidth may change from time to time. Perform site surveys
are using legacy 802.11 a/b/g equipment, consider upgrading to
802.11n or 802.11ac.
If you see the HT channel
bandwidth in the areas where you expect to see VHT, make sure that
your AP is configured to use the 802.11ac mode and that you have
correctly configured its channel width. Also, keep in mind that VHT
is available only in the 5 GHz band.