DFS Compatibility

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  • Updated 11 months ago
I know there are devices that do not support DFS channels, so my question is.... Is it anyway to look at the specs or settings of maybe a laptop, Ipad, chromebook, ect. and tell what channels they support?  I would like to use 40 Mhz channels with DFS enabled, but I don't want change them over and then devices we have not support those channels.
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Bobby

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Posted 11 months ago

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Crowdie, Champ

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A couple of comments:
  • If you need to support low end consumer and residential clients assume they don't support DFS.  I have found the majority don't and the ones that do commonly implement channel change poorly resulting in client disconnections.
  • If you have deployments by ports DFS will be problematic as the ships commonly come into port with their radar on (this comes from experience).
  • I have an AP in my lab with the 5 GHz radio set to a DFS channel broadcasting a unique SSID.   To test the client compatibility is as simple as trying to get it to associate to that SSID.
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Bobby

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Thanks
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Jonathan Hurtt

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In addition to Crowdie's suggestions you could research the WLAN NIC that is installed and google the data sheets to get the specs. You will be looking for 802.11h support which is DFS (and TPC).

For 40Mhz Wide channels you are looking to see what they say for Max Data Rate. You can use http://mcsindex.com to find out what the Max Data rate equates to and whether it supports 20/40/80/160 MHz channel widths.

Also you can check out http://clients.mikealbano.com to see if your client is already listed and what channels they support.

If you really want to get technical you could just capture an 802.11 association request frame of the client and that will tell everything that the client can do. 

Hope that helps.
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Bobby

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Thanks