so the WLC can dynamically chose the 20MHz channel or select 2x20MHz channels to form a 40MHz channel set. clients are assigned 20 or 40 MHz channel on request. so most likely on the AP's involved there are NO clients that are 40MHz capable or have requested 40MHz bandwith. By the way. 802.11ac allows per-frame channel width and bandwidth
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The additional 1,200 MHz is the biggest addition of usable spectrum in decades. Wi-Fi 6 devices capable of using the 6 GHz bands will be known as "Wi-Fi 6E". The "E" signifies the extension into the 6GHz specturm. Wi-Fi 6E devices aren't readily available today, but you can expect to see them on the market in late 2020 and early 2021.
In fact, the IEEE 802.11n standard only specifies two channel width modes: 20MHz only, and 20/40 auto. A few vendors have a nonstandard 40MHz only mode that is not recommended (because in some RF conditions 40MHz-capable clients will choose to use 20MHz mode when it is more robust than 40MHz channels).
This is used for Indoor wireless only and does not require a license. It is a 200MHz wide band which allows for 8 x 20MHz channels to coincide without overlap or 4 x 40MHz. The maximum output power is 200mW which is double the allowed output power of 2.4GHz. Now you may be thinking "great – my wireless is going to transmit further!"…
2.4 GHz ഉം 5 GHz വൈഫൈയും തമ്മിലുള്ള വ്യത്യാസം2.4 GHz OVERVIEWPros: Larger coverage area; better at penetrating solid objectsCons: Lower data

Some run only 20mhz, some multiplex between 20 and 40mhz, and some operate at 144Mb, 270, and 300mbps. what's the relationship between those 3 speeds and the 2 channels? And also, in my gigabit wifi-n router (Netgear WNR854T), I have two settings in the wireless panel that I'm not sure about.

40 mhz not supported by android device Only use 40mhz if you want speed higher than 50 mbps If you want to use with laptop so first download wifi analyser app check if there's channel available like 1-6 or 7-11 if yes then select 40 mhz with based on channel 1 or 11 Now check on google how to use 40 mhz wifi on windows uUA2.
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    • difference between 20mhz and 40mhz wifi