DSL-AC88U very poor annex m upload performance

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  • #922
    LordOfWar666
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    First, sorry for my english, i´m from spain.
    I moved to DSL-AC52U to DSL-AC88U and the result has been disastrous.
    With the AC52U I have a 2.5 upload sync… and now with the AC88U I have 1.8 Upload sync.
    How is it possible that the higher model gives me worse results? my idea was to improve performance and I see that I’m wrong, any suggestions?

    #928
    UK Sentinel
    Moderator
    • Posts 2694
    • Skipper

    The Broadcom DSL chipset do not usually synch as well (rate) as well as the MediaTeK chipset that is in you DSL-AC52U

    But DSL-AC88U should be much more stable, maybe an option to change your SNR values, can you give us a screen copy of your DSL Settings page? so we can see what is happening?

    Is Annex M (ADSL2+ M) your normal choice for your ISP in Spain, I also remember reading that in the early days, another user (babis3g) had issues with ADSL and the DSL-AC88U, I will drop him an email and see if he can advise ?

    In a completely sane world, madness is the only freedom (J.G.Ballard).

    #933
    Damis
    Participant
    • Posts 24
    • Regular

    Is it possible to tweak SNR manually even on the DSL-AC88U?

    I thought you can´t do it on Broadcom chipset.

    #935
    UK Sentinel
    Moderator
    • Posts 2694
    • Skipper

    Is it possible to tweak SNR manually even on the DSL-AC88U? I thought you can´t do it on Broadcom chipset.

    It is on my DSL-AC88U, ASUS have always said, for ADSL, SNR Tweaking is available, for VDSL, it is not. unsure about Annex M, but assume it still applies like ADSL

    Have a look under Administration > DSL Settings > Stability Adjustment (ADSL) ;)

    In a completely sane world, madness is the only freedom (J.G.Ballard).

    #949
    LordOfWar666
    Participant
    • Posts 6
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    The SNR only change the downtream chanel. What is the best model based on the MediaTeK chipset?

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    #953
    UK Sentinel
    Moderator
    • Posts 2694
    • Skipper

    Both the DSl-AC52 and DSL-AC56U have the same MediaTeK DSL chipset, but the DSL-AC56U does have more RAM and is a good little unit.

    Was you given a modem with your ISP service, what does the stats on this read?

    Alas the Broadcom 63138 DSL chipset for ADSL is not ideal, maybe worth looking at an older Broadcom based modem/router?

    For testing, try Annex A, just out of interest, I know in theory, Annex M should have more Upload Synch speed, but worth testing, ?

     

    In a completely sane world, madness is the only freedom (J.G.Ballard).

    #971
    LordOfWar666
    Participant
    • Posts 6
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    I have the ISP modem and the synchronization is better than the AC88U (2.4mb) but is worse than the AC52U (2.5/2.6MB) on the other hand I tested the AC88U router with annex a and the synchronization is 1mb on the upload chanel.

    #973
    UK Sentinel
    Moderator
    • Posts 2694
    • Skipper

    I assume the download Synch speed increased with Annex B, is Upload Synch speed being higher more important than download?

    Let us know what name of ISP Modem name is, so I can check what DSL chipset is has?

    In a completely sane world, madness is the only freedom (J.G.Ballard).

    #975
    LordOfWar666
    Participant
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    The router of my ISP is the Comtrend AR 5307U, for me is more important the upload than download I prefer 2.5mb of upload and 10mb of download than 25 MB of download and 2 of upload.

    Thanks.

    #977
    UK Sentinel
    Moderator
    • Posts 2694
    • Skipper

    The router of my ISP is the Comtrend AR 5307U, for me is more important the upload than download I prefer 2.5mb of upload and 10mb of download than 25 MB of download and 2 of upload. Thanks.

    The Comtrend AR5307U also  has a MediaTeK chipset, so looks like in your part of the world, for highest upload synch speed (Annex M) , MediaTeK chipset suits your needs best.

    I personnaly use Lantiq based DSL chipset, but they, like Broadcom, will not synch as at a higher rate compared to MediaTeK, but are very stable.

    Looks like DSL-AC56 is a wise upgrade, for you

     

    In a completely sane world, madness is the only freedom (J.G.Ballard).

    #980
    LordOfWar666
    Participant
    • Posts 6
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    Thanks a loot, My next buy is the DSL-AC56U.

    PD: It´s sad, I love the AC88U and I have heard wonders of the broadcom chipsets, but 30% less of performance is too much for me.

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