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Featured 160 MHz Wi-Fi Channels: Friend or Foe?

Discussion in 'Wireless Article Discussions' started by thiggins, Sep 24, 2018.

  1. thiggins

    thiggins Mr. Easy Staff Member

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    [​IMG]
    160 MHz channel bandwidth is an essential feature of 802.11ax. We take a look at whether it means trouble for your 11ac network.

    Read on SmallNetBuilder
     
    Last edited: Sep 24, 2018
    sm00thpapa and RMerlin like this.
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  3. RMerlin

    RMerlin Super Moderator

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    Interesting article. What driver version did you use with the Intel? Versions before 20.70 have a few compatibility issues, don't know if they apply to 160 MHz channels or to 802.11ax STAs however.
     
  4. thiggins

    thiggins Mr. Easy Staff Member

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    20.80.1.1 64 bit. I updated the article.
     
  5. RMerlin

    RMerlin Super Moderator

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    Thanks. That's the latest, so this rules out driver issues (unless it's a different issue Intel hasn't addressed yet).
     
  6. sfx2000

    sfx2000 Part of the Furniture

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    Nice article...

    In test cases (2) and (3), simulating the adjacent network, how much additional attenuation are you adding for the simulated neighbor AP?
     
  7. sfx2000

    sfx2000 Part of the Furniture

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    Wondering if this is an artifact of the QCA chip firmware in the PAL regarding RTS/CTS behavior on the uplink when in client STA mode?
     
  8. thiggins

    thiggins Mr. Easy Staff Member

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    The neighboring network isn't simulated. It's a real router and STA.

    The two APs are fairly close, in adjacent octoBox chambers, but with doors open.
     
  9. thiggins

    thiggins Mr. Easy Staff Member

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    Could be possible. I checked with octoScope before posting the review. Have not heard anything back.

    I've seen this uplink/downlink difference with 80 MHz bandwidth devices too. Usually four stream products.
     
  10. phrehdd

    phrehdd Occasional Visitor

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    While not exactly on point here, I see this notion of a higher speed or rather greater data moved at a given moment is not a bad idea for WiFi bridges or items like Netgear Orbi where the two modules talk to each other. The devices (computers etc.) do not directly use the 160 bandwidth.

    end user device <---ac--
    > router<------ax----->router<---ac--->end user device.
     
  11. Dennis Bland

    Dennis Bland New Around Here

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    Great testing and analysis, as usual. It will be interesting to see how 802.11ac 160 MHz performance compares with draft-11ax, once draft-11ax STAs become available.
     
  12. thiggins

    thiggins Mr. Easy Staff Member

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  13. avtella

    avtella Very Senior Member

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    Interesting that some of those runs were so erratic.

    At least with large file transfers I was getting consistent/stable transfers of 104-114 MB/s downlink depending on the location in my home on my R7800 with HT160 (9260ac in a Dell 7577) using a ReadyNAS 524X as the source for downloads.

    As for the Intel driver, I think before the .50 or .60 series drivers can’t recall which but there would be occasional dropouts on 160Mhz. Then everything was fine till the latest R7800 .58 firmware that pretty much made 5Ghz useless.
     
    Last edited: Oct 10, 2018 at 10:08 PM
  14. thiggins

    thiggins Mr. Easy Staff Member

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    So were the stable transfers done with R7800 .58 firmware or earlier? I used version 1.0.2.58 (latest).
     
  15. avtella

    avtella Very Senior Member

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    The latest 1.0.2.58 firmware is causing major stability isssues with the 9260ac, intermeittent disconnects. 2.4 GHz is fine. My 160Mhz testing was done on firmwares earlier than .58.

    Looking back at some of my earlier posts on other threads, seems I was testing the 9260ac since Feb, and I usually am on the latest router firmware/wireless drivers, so all the firmwares since that period were fine except for this .58 update. There was an earlier issue where on HT160 the 9260ac would disconnect but that was an Intel driver issue fixed somewhere in the 20.50.X.X/20.60.XX series drivers.

    There were a few people complaining on Netgear’s forums regarding issues with latest firmware update in regards to 5Ghz.

    Some of my initial testing mentioned here:
    https://www.snbforums.com/threads/review-of-intel-wireless-ac-9260-9560.44622/#post-381423
     
    Last edited: Oct 11, 2018 at 11:07 PM
  16. sfx2000

    sfx2000 Part of the Furniture

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    You know - MESH likely is going to land on the same channel across the AP's...

    This is the...

    download.jpg

    with regards to the testing with neighboring BSS/ESS sets - as the popular Mesh things are likely going to share channels.

    Even with Orbi - the backhaul might be on one channel, but the clones will be on another, and generally there, it's a shared channel.

    What happens with 20dB attenuation on the neighboring AP? Or 10dB for apartments...

    Co-channel interference is a concern, but given that spreading loss is a 10LogR function with adjacent AP's

    11n/11ac actually have decent co-channel interference thresholds - I'd hate for this to be a banner issue for things like 11b/11g - which was true there...
     
  17. sfx2000

    sfx2000 Part of the Furniture

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    BTW - nice on the retest - kind of thought something was up with the Octoscope STA's, just didn't make sense there.

    The Intel STA driver - well, generally theyre pretty good in many circumstances, and a go-to driver for Linux - but the Chipset under test is relatively new, so some challenges for both Win and Linux there...
     
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