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https://support.portalwifi.com/hc/en-us/articles/230886168-List-of-devices-for-compatibility-mode
Below is a list of devices that we know off that do not support all of the FastLanes (or DFS channels). Please use the following compatibility mode for your device. ... Almost all client devices using the WiFi standard 802.11ac built in the past 4 years can work in these channels. This includes all major brands of smartphones, and tablets.
https://metis.fi/en/2017/08/dfs-en/
One solution is to use only DFS free channels. All devices don’t support the high U-NII-3 channels so this leaves us the lower channels from 36 to 48. In a quiet radio environment you can build your network on those channels. They tend to be crowded however, since every administrator wants to use them.
https://www.tp-link.com/us/support/faq/763/
Wireless client are not able to find the wireless signal broadcasting by the AP during this period. Although DFS give you the choice to use DFS channels but it may be annoying when there is radar operating nearby. To mitigate the effect of DFS you may choose a fixed non-DFS channel if available.
https://wifinigel.blogspot.com/2018/05/the-5ghz-problem-for-wi-fi-networks-dfs.html
Wi-Fi networking provides us with 2 bands for the operation of wireless LAN networks: the 2.4Ghz band and the 5GHz band. The 2.4GHz band has a reputation of being something of a “sewer” of a band, due to its limited number of usable channels, the number of Wi-Fi devices already using the band, and the high levels of non-Wi-Fi interference that it experiences.
https://community.arubanetworks.com/t5/Controller-Based-WLANs/What-is-Dynamic-Frequency-Selection-DFS-How-to-Enable-it-What/ta-p/179170
DFS is a mechanism to allow unlicensed devices to use the 5 GHz frequency bands already allocated to radar systems without causing interference to those radars. The concept of DFS is to have the unlicensed device detect the presence of a radar system on the channel they are using and, if the level of the radar is above a certain threshold, vacate that channel and select an alternate channel.
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