[SOLVED] VHT160 Use With R7000P

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PaulGo
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PostPosted: Wed Jul 20, 2022 19:12    Post subject: Reply with quote
My motto is "Hope Springs Eternal". Very Happy
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the-joker
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PostPosted: Wed Jul 20, 2022 20:08    Post subject: Reply with quote
It sounds like, a eternal nag and hope for the best Razz Surprised Shocked

Unless your motto can spring some code, please curb your enthusiasm.

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kernel-panic69
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PostPosted: Thu Jul 21, 2022 15:22    Post subject: Reply with quote
@PaulGo: I don't have any VHT160-capable clients to test VHT160 on my R700P, however, what I will say here is that while you've mentioned that it is not supported by the device (in stock firmware?), DD-WRT employs modifications to (hopefully) support VHT160 channel width (I think?) and it may not work as expected. VHT160 only has almost no valid channel selections other than what is given. There is also the possibility that the VHT160 selection applies to other devices that *do* natively support it and it is just a carryover due to certain shared code within DD-WRT - which I would have to physically check and verify myself. It's up to you and nobody else as to whether or not to continue testing or discussing this topic on this forum. I may revisit this later after I find time to review code and gain some definite clarity. Your input is greatly appreciated.
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the-joker
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PostPosted: Thu Jul 21, 2022 15:42    Post subject: Reply with quote
Ide normally abstain from commenting about such wild claims, unless you have access to what is essentially closed source code and thus not part of the DD-WRT public tree, well... Not to mention on how they were modified recently.

I dont have or want access to such code. Low level C coding at such extent is reserved to very very very few people. I admit I dont know.

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kernel-panic69
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PostPosted: Thu Jul 21, 2022 15:55    Post subject: Reply with quote
And I was abstaining from not only using BrainSlayer's own words, but addressing the elephant in the room. That being said, I am going with my best educated guess since I now currently have the same access with Broadcom and can reverse-engineer and inspect the binary object files directly if needed to further explain, although the "answer" is probably somewhere not laden with proprietary burdens. Got other fish to fry, don't want to hear any more noise on this, thanks for understanding.
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PaulGo
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PostPosted: Thu Jul 21, 2022 16:25    Post subject: Reply with quote
The way I can check the width of a channel using VHT80 and then trying VHT160 is with the app "WiFi Analyzer" on my Android Galaxy S21 phone. The app shows graphically the channel width. It accurately shows the 160Mhz channel width used by my AX6 router and the 80Mhz channel width with my R7000P router. However, when I try VHT160 on the R7000P it still only shows 80MHz channel width. So I have come to the conclusion VHT160 is currently not something that the R7000P can do using DD-WRT.

I am not complaining about this since I don't have a need to use VHT160 but I just wanted to point out something possibly which should not show up for this router and when I tried to use it on a previous build caused problems which caused me to reset the router.

I am extremely grateful for the work put into DD-WRT and in the complexity for supporting so many routers. I also realize how import it is to keep a router's firmware current to prevent hackers from using vulnerabilities in older firmware, especially those abandoned by the router's manufacturer.
the-joker
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PostPosted: Thu Jul 21, 2022 17:28    Post subject: Reply with quote
Wifi analyzer shows what it shows, clients/routers support what they support.

One does not equal the other.

Only by reading the clients full specs and whitesheets and assuming the functionality isnt removed on purpose from clients by the given stock firmware of the clients device you can make any educated guess.

If clients dont connect using the wider channel width, then its safe to assume the client doesn't support it (bare in mind the following, its important to consider). Having said that, its closed source and Broadcom are known for implementing off spec/standard shit, but each manufacturer can only support what is standard unless their chipset supports these off spec/standard implementations.

You Wont find Atheros/Broadcom will ever play well together. SO the S21 being which chipset radio wise? Atheros right?

Atheros also has their own ideas and never will match with Broadcom.

You can continue mentioning this ad nauseam, it wont however have any influence on how Broadcom/Atheros implement their shit and if DD-WRT shows something and allows it, its only compatible with Broacom clients who will support it. And just because both client/router are broadcom both need to implement/understand the off spec crap.

But sure, ignore the realities. All are welcome to have their own opinions even based on no facts. Ill gladly yield to actual facts proving otherwise.

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PaulGo
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PostPosted: Thu Jul 21, 2022 17:48    Post subject: Reply with quote
From the specifications I read, the Samsung S21 supports VHT160.
the-joker
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PostPosted: Thu Jul 21, 2022 17:54    Post subject: Reply with quote
And which radio chipset is it? Atheros or Broadcom and which models are these?
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ho1Aetoo
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PostPosted: Thu Jul 21, 2022 18:05    Post subject: Reply with quote
https://docs.broadcom.com/doc/4389-AN1

https://www.broadcom.com/products/wireless/wireless-lan-bluetooth/bcm4389
the-joker
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PostPosted: Thu Jul 21, 2022 18:46    Post subject: Reply with quote
If @ho1Aetoo means this 160MHz channel width is for 6GHZ routers then clearly soemthing is going on.

Ping the boss who has code access to closed source shit.

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PaulGo
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PostPosted: Thu Jul 21, 2022 18:53    Post subject: Reply with quote
Also, the S21 is a certified WiFi 6 device and 160Mhz support is part of the WiFi 6 standard.

Last edited by PaulGo on Thu Jul 21, 2022 19:06; edited 1 time in total
dale_gribble39
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PostPosted: Thu Jul 21, 2022 19:01    Post subject: Reply with quote
PaulGo wrote:
From the specifications I read, the Samsung S21 supports VHT160.

the-joker wrote:
And which radio chipset is it? Atheros or Broadcom and which models are these?

https://fccid.io/A3LSMG991U/Internal-Photos/Internal-Photos-20201106-v1-A3LSMG991U-FCC-Internal-Photos-5006462

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ho1Aetoo
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PostPosted: Thu Jul 21, 2022 19:02    Post subject: Reply with quote
No these are the specifications and a performance test for the BCM4389 chip in the S21.

See the test, Broadcom has tested the Smatphone itself but in the 6Ghz band.

In general, a channel width of 160Mhz is also available in the 5Ghz band.
However, very few AC chipsets support it.

but reading is probably too much to ask
dale_gribble39
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PostPosted: Thu Jul 21, 2022 19:12    Post subject: Reply with quote
The 5GHz radio only supports 80MHz, as already noted:

https://wikidevi.wi-cat.ru/Netgear_R7000P

https://www.anandtech.com/show/10954/linksys-enters-mesh-wifi-market-with-velop-whole-home-wifi-expands-maxstream-lineup

https://www.broadcom.com/products/broadband/xdsl/bcm4366e

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This is me, knowing I've ruffled your feathers, and not giving a ****
Some people are still hard-headed.

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