This infographic was inspired by the work of Nigel Bowden and Devin Akin. Nigel wrote this really good article on DFS that you can find on his website wifinigel.blogpost.com. Devin presented a really detailed webinar on DFS in partnership with Netscout. You can find the recording here.
I would encourage you to go and take a look at their ressources.
Note: there are a lot of disparities in the way DFS operations work between the different Wi-Fi vendors. It was a challenge to try to standardize it into one graphic. Please perform detailed testing of your own WLAN solution to find out what the actual DFS operations are in your environment.
Download the DFS operations infographic (PDF, 0.5 MB)
Feel free to look at these ressources if you want to learn more about DFS operations:
- Nigel Bowden's Blog post on DFS: http://wifinigel.blogspot.com/2018/05/the-5ghz-problem-for-wi-fi-networks-dfs.html
- Devin Akin's webinar on DFS: https://www.brighttalk.com/webcast/5522/279895/designing-with-dfs-channels
- DFS Regulations in Canada: http://www.ic.gc.ca/eic/site/smt-gst.nsf/eng/sf10971.html
- IEEE 802.11-2016 Standards Clause 11.9
I would like to thank Devin and Nigel for their help in reviewing the infographic and providing feedbacks. If you think of a way we could improve this infographic, do not hesitate to let me know in the comments below.
Thank you!