Which Wi-Fi 6 router with 160MHz bandwidth support implements the best DFS (Dynamic Frequency Selection) mechanism?

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lazer5

New Around Here
I need a wireless router that pairs nicely with an Intel AX200 Wi-Fi 6 wireless card. Dual stream (2x2) and dual band are sufficient.

This is for Europe, where you have two choices for placing the 160MHz wide channel, either at channels 36-64 (power limit 23dBm (200mW)) or channels 100-128 (power limit 30dBm (1000mW)).

Ideally I'd like to have the router to work like this: I configure the router to transmit the 5GHz Wi-Fi signal on channels 100-128. In case of a radar signal detection on those channels the router should temporarily switch to channels 36-64 and, once the regulatory waiting times have passed and the channel range 100-128 has been successfully re-checked for being free of radar activity, the router should switch back to my preferred channels 100-128.

While this sounds straightforward, it is apparently not so easy to implement for the manufacturers.

My problem is that router manufacturers don't tell you how they have implemented DFS and also product reviewers on the internet never go into detail how well a particular router's DFS works. So, as far as DFS is concerned, one ends up buying a pig in a poke.

I have already invested in two different Wi-Fi 6 160MHz AX3000-class routers, but both have let me down.
 

thiggins

Mr. Easy
Staff member
There is no router I know of that provides any control over how DFS is handled.

Switching back to channel(s) where radar detection has been triggered might not be a good strategy, BTW.
 

lazer5

New Around Here
Thanks for the reply.

But why not? Unless one lives at a place that is very frequently exposed to radar signals I see no reason why switching back wouldn't be a good idea, especially if those channels provide other advantages, like being less crowded or higher permitted transmit power.

What's the point of having a router with 160MHz bandwidth support if it resorts to the four non-DFS channels 36-48 (in Europe) upon detecting a radar signal and then stays there forever? (until you reboot it)

Apparently years ago there have already been Wi-Fi 5 (AC) routers with sophisticated DFS channel management that may have come pretty close to the ideal solution.
 

thiggins

Mr. Easy
Staff member
If the radar trigger was an isolated event, sure, switching back would be good. But if you know you are in an area where radar is in use, then you're just in for more annoyance.

The small number of contiguous DFS channels is the reason DFS isn't commonly supported in AC routers. That, and the fact that the certification process is expensive.

DFS support seems to be more common in Wi-Fi 6 routers, even though they have access to the same channels. Wi-Fi 6E will make DFS support more practical.

IDL does have some nice technology. But they have been largely unsuccessful in getting companies to license it.

Of course, you could try limiting bandwidth to 40 MHz channels, which would provide more DFS channel switching options, at the expense of lower bandwidth. But unless you need 100's of Mbps bandwidth per device, which is not the usual case, the tradeoff could be worth it. Business and commercial networks that need to support many users generally run 5 GHz 40 MHz channels at most, and in many cases only 20 MHz.
 

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