WRT3200ACM VHT160 channel selection

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plawer
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Joined: 11 Aug 2019
Posts: 156
PostPosted: Tue Dec 28, 2021 19:59    Post subject: WRT3200ACM VHT160 channel selection Reply with quote
Router Linksys WRT3200ACM
Firmware: DD-WRT v3.0-r47911 std (12/23/21)

According to
https://wiki.dd-wrt.com/wiki/index.php/Basic_Wireless_Settings#Channel_Width
the valid VHT160 channels are
64+LLL
100+UUU
128+LLL

In the attached screenshot, I can only select Auto or channels 100-128, but not channel 64.

If I select VHT80, I can select 36-60, 100-144, 149-157.

I already have one router configured to VHT160/100+UUU. How can the second router/AP be configured to VHT160/64+LLL?
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Linksys: Several WRTxx00AC variations | Netgear: 4x WNDR4500v2, 7x WNDR4300, R6400v1 | Asus: 2x RT-AC66U | Gl.inet: 3x GL-AR150
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blkt
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PostPosted: Wed Dec 29, 2021 3:32    Post subject: Reply with quote
Select regulatory domain, then channel width, then extension channel, then channel.
Per Yngve Berg wrote:
1) set the Channel Width and Save.
2) Set the Extension Channel UU, LL or UL and save
3) The channel list will now show legal channels with the settings 1-2. Select channel and apply.
It's not broken, it's by design. also wrt3200acm -- wasting my time with this router?
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plawer
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PostPosted: Wed Dec 29, 2021 15:59    Post subject: Reply with quote
That conversation is related to Atheros builds. But... I have tried what Per Yngve suggests, and I still only see Auto and 100-140 after clicking Save between each change.
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Linksys: Several WRTxx00AC variations | Netgear: 4x WNDR4500v2, 7x WNDR4300, R6400v1 | Asus: 2x RT-AC66U | Gl.inet: 3x GL-AR150
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ho1Aetoo
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Joined: 19 Feb 2019
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Location: Germany
PostPosted: Wed Dec 29, 2021 16:14    Post subject: Reply with quote
You do not need to select the extension channel at all.
It is automatically selected correctly if you have disabled "allow channel overlapping".

1. select channel width
2. select channel
3. save


and as blkt already mentioned it depends on your regulatory domain which channels are allowed

germany (Atheros) >
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plawer
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PostPosted: Wed Dec 29, 2021 16:19    Post subject: Reply with quote
Thanks. So I can select it when my regulatory domain is Germany but not United States.
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ho1Aetoo
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Location: Germany
PostPosted: Wed Dec 29, 2021 16:20    Post subject: Reply with quote
root@DD-WRT:~# iw reg get
global
country US: DFS-UNSET
(2400 - 2483 @ 40), (N/A, 30), (N/A)
(5150 - 5250 @ 80), (N/A, 23), (N/A)
(5250 - 5350 @ 80), (N/A, 23), (N/A)
(5470 - 5730 @ 160), (N/A, 23), (N/A)
(5730 - 5850 @ 80), (N/A, 30), (N/A)
(57240 - 71000 @ 2160), (N/A, 40), (N/A)

not allowed in the US
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plawer
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PostPosted: Wed Dec 29, 2021 16:29    Post subject: Reply with quote
Well, that sucks. It also seemed like the 5G network didn't come up with those settings. It didn't appear on my network scanner along with the 2.4GHz network.

Case (kinda) closed.
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bushant
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PostPosted: Wed Dec 29, 2021 16:38    Post subject: Reply with quote
I looked at several domains.
Canada has ch 64 but it appears Germany is top dog for number of channels allowed.

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ho1Aetoo
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Location: Germany
PostPosted: Wed Dec 29, 2021 17:04    Post subject: Reply with quote
The EU countries all have the same channels and limits.
You can also take Poland or anything else.

(but BS has activated additional 160Mhz frequencies for some countries)
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plawer
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PostPosted: Wed Dec 29, 2021 17:11    Post subject: Reply with quote
bushant wrote:
I looked at several domains.
Canada has ch 64 but it appears Germany is top dog for number of channels allowed.



But the 5G network still doesn't come up with Canada/VHT160/64/LLL settings.
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ho1Aetoo
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PostPosted: Wed Dec 29, 2021 17:16    Post subject: Reply with quote
Show the WLAN status
WebIF > Status > WLAN > wlan0 or wlan1 (5ghz)

There you can see if the AP was started.
What the clients see often doesn't mean much - they have their own tables.
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plawer
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PostPosted: Wed Dec 29, 2021 17:22    Post subject: Reply with quote
Yes, it shows "Channel Unknown" when selecting channel 64 or Auto with regulatory domain being Canada.
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Linksys: Several WRTxx00AC variations | Netgear: 4x WNDR4500v2, 7x WNDR4300, R6400v1 | Asus: 2x RT-AC66U | Gl.inet: 3x GL-AR150
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plawer
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Posts: 156
PostPosted: Wed Dec 29, 2021 17:41    Post subject: Reply with quote
Fun fact

US/VHT80/60/UU and US/VHT80/60/UL also end up with Channel Unknown.

US/VHT80/60/LU shows "60 + 58 (5300 MHz VHT80)"
US/VHT80/60/LL shows "60 + 54 (5300 MHz VHT80)"
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ho1Aetoo
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Location: Germany
PostPosted: Wed Dec 29, 2021 18:05    Post subject: Reply with quote
plawer wrote:
Fun fact

US/VHT80/60/UU and US/VHT80/60/UL also end up with Channel Unknown.


60+UU is also not a valid 80 Mhz channel
there are maximum 40Mhz possible 60+64

60 is LU und nothing else

plawer wrote:
US/VHT80/60/LL shows "60 + 54 (5300 MHz VHT80)"


works but is not recommended - has a broken 40Mhz channel and many clients will then only connect at 20Mhz instead of full speed
(or do not connect at all because the firmware crashed)

and regarding the 160Mhz channels, the WRT3200ACM has a region lock (all models).
It has its own tables (Power Table) for the radios and it is very well possible that the embedded tables and radio firmware make you a stroke through the bill.

On my Atheros router all channels work fine.

you can try 36+UUU as channel (it's the same spectrum only mirrored)

36+UUU
20Mhz = 36
40Mhz = 38
80Mhz = 42
160Mhz = 50

64+LLL
20Mhz = 64
40Mhz = 62
80Mhz = 58
160Mhz = 50
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