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    Upload noise margin always > than download?

    This is a discussion on Upload noise margin always > than download? within the Speed tests and how to get better results forums, part of the Sky Broadband help and support category; Any idea why the upload noise margin always seems to be higher than the download margin Ė I thought the ...

    1. #1
      DesertRaven's Avatar
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      Upload noise margin always > than download?

      Any idea why the upload noise margin always seems to be higher than the download margin Ė I thought the modem was always aiming for the default of 6.9 db, or does that only apply to download?

      Thanks


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    3. #2
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      Re: Upload noise margin always > than download?

      Quote Originally Posted by DesertRaven View Post
      I thought the modem was always aiming for the default of 6.9 db, or does that only apply to download?
      Yep, the upload will always be different.


    4. #3
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      Re: Upload noise margin always > than download?

      It looks like you have not been upgraded yet. When you are the upload speed increases and the noise margin comes nearer the default. Post your stats if you would like advice.

      TomD


      Please note the views and recommendations in my posts are my own and in no way reflect the views of SkyUser.


      Useful Utilites

      https://www.nirsoft.net/utils/wifi_information_view.html/ TCPOptimiser /Test Socket

      Note - When downloading always select the Custom install or you will end up with stuff you don't want.





    5. #4
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      Re: Upload noise margin always > than download?

      A quick bit of background to the stats, Iím running V1.03.87 (CU3.04) - thankís IsItMe (your suggestion) itís a fantastic firmware update for the DG834GT, Iíve lowered my default Noise Margin to 3.9, and also use G.DMT which is overriding the default DSLAM ADSL2+ preference.

      Donít panic, all is well as Iíve a very stable line and itís been running without any issues since the firmware update over a week ago!
      Down Up
      SNR (dB): 4.9 12.0
      Attn(dB): 54.0 31.5
      Pwr(dBm): 19.5 12.5
      Max(Kbps): 4672 1056
      Rate (Kbps): 4096 800

      From the stats Iím pushing things with my download speed vs margin however the upstream margin Ďsuggestsí the cap could be raised slightly.

      Itís interesting looking at the Max (Kbps) , Iím guessing this is calculated by the DSLAM during DLM and itís this figure Sky use on MySky when they say ďyour line is estimated capable of 4.5MbpsĒ. From the Up Max (Kbps) Iíd estimate I could get about 900 Kbps given my noise margin.

      Itís more out of interest than anything.

      (Stats are from a Master Socket Splitter, no change if in Test Socket).

    6. #5
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      Re: Upload noise margin always > than download?

      Be careful about lowering your noise margin too much. If it is too low, although you have a better sync and may not drop, excessive errors can slow your actual download speed. If DLM has not run on your line, I would advise you to leave any tweaking until it does so.

      TomD


      Please note the views and recommendations in my posts are my own and in no way reflect the views of SkyUser.


      Useful Utilites

      https://www.nirsoft.net/utils/wifi_information_view.html/ TCPOptimiser /Test Socket

      Note - When downloading always select the Custom install or you will end up with stuff you don't want.





     

     

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