AX86U - DFS Channels cleared in wireless log - but can not select in Wireless settings - Help

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geoffroyg

Occasional Visitor
Hi,

I am puzzled am trying to set the 160Mhz Band on 100-128 Channels. They are cleared from DFS in the wireless log, but can not access them.

Screen Shot 2021-04-12 at 4.03.55 PM.png


and here my wireless settings:

IMG_1936s.jpg


If anyone could help me.

I am running latest merlin firmware.

Regards
Geoffroy
 
Last edited:

Tucu

Regular Contributor
What region/country is the router set to? Most routers in Europe don't bother with channels 120-128 due to the 10 minutes CAC requirement on those. That leaves only 1 160Mhz channel in the 5Ghz band (using channels 36-64)
 

john9527

Part of the Furniture
What happens if you turn off 160MHz bandwidth.....do they show up then?
 

geoffroyg

Occasional Visitor
I bought the router in EU, currently operating it in Turkey. Same regulations. channels 36-64 are so congested, I am better of on 80mhz 100-112. But what I do not understand is why I can't even try it on the 100-128. The menu just do not appear. Is it a normal behavior?
 

geoffroyg

Occasional Visitor
@john9527 : No they dont.

If I select 80Mhz, I get this and on 40Mhz I get this

Screen Shot 2021-04-12 at 5.28.44 PM.png
Screen Shot 2021-04-12 at 5.27.48 PM.png
Screen Shot 2021-04-12 at 5.32.53 PM.png



I can't access channels 120-128 in any bands. So I get only 1- 160Mhz, (36-64), 3 80Mhz (36-48) (52-64) and (100-112)
On the 20Mhz it is even clearer that the 120 124 128 are missing.

Any thoughts?
 

ColinTaylor

Part of the Furniture
That's normal for all the EU routers I've seen. As @Tucu said, it's because of the 10 minute wait time that most router manufacturers don't use channels 120-128.

Same thing on my old RT-AC68U: Untitled.png
 

Tucu

Regular Contributor
They just didn't bother to implement the 10 minute CAC check required on those channels; or at least they decided not to offer it to the users.
You can try a custom firmware to see if one of them supports it. OpenWrt does, but it is not available on the AX86
 

geoffroyg

Occasional Visitor
I guess my next router will come from the US... Thank you for clarifiying. I will contact ASUS and ask if they plan to implement the CAC check in a firmware update ... otherwise this puppy goes back to where it came from ...
 

Tucu

Regular Contributor
I guess my next router will come from the US... Thank you for clarifiying. I will contact ASUS and ask if they plan to implement the CAC check in a firmware update ... otherwise this puppy goes back to where it came from ...
No panacea in the US either. People have been reporting that the US version of AX68U does not support DFS channels. A router bought from the US might not follow the rules of your country.
 

archiel

Senior Member
Oddly enough the RT-AX88U (in the UK ) does support those channels
1618240126566.png
 

geoffroyg

Occasional Visitor
@archiel just out of curiosity, I see you have a AX58U that also supports 160Mhz. Can you also select those channels?
I see it is in mesh, so if not wired backhaul, could you on the AX88U manually select the 160Mhz band on control channel 120, and see in the wireless log if the AX58U connected to it on 160Mhz?
If this is the case, would be odd that only the AX86U would not be able to access these channels... and that my device has a problem.
 

Tucu

Regular Contributor
@Tucu & @ColinTaylor how do you explain archiel post above? How can he select these channels 120 124 and 128 on a european router?
Asus support of DFS channels is a lottery. Channel 120-128 are legal to use in the ETSI area as long as long as the 10 minute CAC rule is followed. Most consumer routers just ignore them as it confuses users as it takes 10 minutes for the radio to become active after a reboot or channel change. The AX88U is the odd one out in this case, not the norm.
 

archiel

Senior Member
@archiel just out of curiosity, I see you have a AX58U that also supports 160Mhz. Can you also select those channels?
I see it is in mesh, so if not wired backhaul, could you on the AX88U manually select the 160Mhz band on control channel 120, and see in the wireless log if the AX58U connected to it on 160Mhz?
If this is the case, would be odd that only the AX86U would not be able to access these channels... and that my device has a problem.
Just switched to 120/160 and backhaul is showing 160.
1618254006481.png
 
Last edited:

underdose

Regular Contributor
I bought the router in EU, currently operating it in Turkey. Same regulations. channels 36-64 are so congested, I am better of on 80mhz 100-112. But what I do not understand is why I can't even try it on the 100-128. The menu just do not appear. Is it a normal behavior?

I bought an AX58U from EU and live in Turkey, too. And I am able to select those channels without using any workarounds.

1618255058937.png
 

geoffroyg

Occasional Visitor
I am wondering how in the streams column you have 4 (ax), when the AX58U is 5ghz 2X2? another odd thing... I would have expected 2 (ax)
@ archiel : Found your PHY rate transmit and receive. It's a typo in the wireless log you are indeed on 2 (ax), RX 1441 corresponds to 160Mhz 64QAM and TX 1837 1024QAM... wow on the 1024QAM... are you routers close to one another?


Screen Shot 2021-04-12 at 11.28.38 PM.png
 

archiel

Senior Member
@ archiel : Found your PHY rate transmit and receive. It's a typo in the wireless log you are indeed on 2 (ax), RX 1441 corresponds to 160Mhz 64QAM and TX 1837 1024QAM... wow on the 1024QAM... are you routers close to one another?


View attachment 33116
Only about 8m (and one quite thick wall) apart. I bought the AX58U to replace the AC87U (due to it going end of life with Merlin). The AC87U had several blackspots and the AX58U was much worse, so got the AX88U. Probably overkill, but now have very strong signals throughout the house, whereas each on their own would leave certain very weak signal areas (floors/walls, miscellaneous other interfering materials.

Where did the image come from / is there text to go with it?
 

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