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AC-68U wifi decent, AX88U is pretty dire

Discussion in 'ASUS Wireless' started by Nexy, Jul 11, 2019.

  1. Nexy

    Nexy New Around Here

    Joined:
    Aug 16, 2017
    Messages:
    8
    Quick explanation of topology setup:

    Cable modem > AX88U > cat7 ethernet cable > AC68U

    I have both routers set up on a fibre connection with 550 down / 35 up, the 68U being used just as an access point and a switch for devices near my PC. Please note: I disable/enable wifi on either of the routers, to specifically test them in isolation.

    AC68U: Merlin 380.67
    AX88U: Merlin 384.12

    Ever since I got the AX88U, providing I have line of sight to the router, everything is perfectly fine, I can get ~350Mbps down, full 35 up, using my samsung S7 as a testing platform (yes, I know mobile phones aren't perfect for testing, but it's what I have available).

    Now, if I go downstairs (or even on the same floor in the next room), with a single width brick wall in the way, bearing in mind my phone still says 4/5 bars signal, the throughput drops off dramatically on the AX.

    AC68U: 262mpbs down 15.6mbps up. 116ms jitter

    I do the exact same test, with both wireless configs set up identically - to the best of my knowledge (and bearing in mind at this point I disable the wifi on the AC68U, enable it on the AX88U)

    AX88U: 4mbps down 0.91mbps up. 612ms jitter.

    Both were in pretty much the same location (4 foot apart), testing with the same device, to the same speedtest server.

    Configuration time:

    AC68U:
    Band: 5ghz
    Enable Radio Yes
    Set AP Isolated No
    Roaming assistant Disable
    Enable IGMP Snooping Disable
    Multicast Rate(Mbps) Auto
    AMPDU RTS Enable
    RTS Threshold 2347
    DTIM Interval 3
    Beacon Interval 100
    Enable TX Bursting Enable
    Enable WMM APSD Enable
    Optimize AMPDU aggregation Disable
    Optimize ack suppression Disable
    Airtime Fairness Disable
    802.ac Beamforming Enable
    Universal Beamforming Disable <This being on/off makes no notable difference.
    TX power adjustment Performance

    Wireless mode: Auto
    Channel bandwidth: 80
    Control channel: auto (plus Auto select channel including DFS channel checked
    Extension channel: auto


    AX88U
    Enable Radio Yes
    Enable wireless scheduler No
    Set AP Isolated No
    Roaming assistant Disable
    Enable IGMP Snooping Disable
    Multicast Rate(Mbps) Auto
    AMPDU RTS Enable
    RTS Threshold 2347
    DTIM Interval 3
    Beacon Interval 100
    Enable TX Bursting Enable
    Enable WMM Enable
    Enable WMM No-Acknowledgement Disable
    Enable WMM APSD Enable
    Optimize AMPDU aggregation Disable
    Modulation Scheme Up to MCS 9 (802.11ac)
    Airtime Fairness Disable
    Multi-User MIMO Enable
    802.11ac Beamforming Enable
    Universal Beamforming Disable < (Tried this enabled, makes no difference)
    Tx power adjustment Performance

    Smart connect: Disabled
    Wireless mode: Auto
    802.11ax HE frame support: Disable
    Channel bandwidth 80 << (Tried 20/40/80 no difference)
    Control channel: Auto (plus Auto select channel including DFS channel checked)
    Extension channel: Auto


    So, I "believe" that they're set up as close to each other as possible, with the AX having a few more options than the AC68U.

    I am struggling to figure out why the AC68U performs so much better than the AX88U. It's a complete headscratcher at this point.

    I've checked the antenna's and they're all on pretty tight too. If anything, the AX (in theory at least), should be better (miniscule) as it doesn't have to switch the traffic over the Lan to another device, to then be processed into wifi, but it's clearly not the case.

    Wired connection off the back of the AC68U, I get ~520 down and 35 up (pretty much full advertised speed).
     
  2. Nexy

    Nexy New Around Here

    Joined:
    Aug 16, 2017
    Messages:
    8
    The plot thickens. I borrowed my partners S9, and that had 229 down 35 up. So, oddly, it might actually be the phone that has issues. Tested with laptop downstairs, 350 down 35 up. So, I think I've nailed down where the issue lies. I'll do some more testing, but if it IS the phone, again, why does it like one AP but not the other.
     
  3. Grisu

    Grisu Part of the Furniture

    Joined:
    Aug 28, 2014
    Messages:
    2,057
    Why dont you update 68U to 384.12 too?

    Delete Wifi-setting on client and connect again to AX88U, maybe better then.
    Power off 68U in the meantime.