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    Very low SNR after migrating in from ADSL Max

    This is a discussion on Very low SNR after migrating in from ADSL Max within the Router stats forums, part of the Broadband Technical Help category; Ok so when I first connected to ADSL Max my SNR was around the 6 mark, then I had some ...

    1. #1
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      Very low SNR after migrating in from ADSL Max

      Ok so when I first connected to ADSL Max my SNR was around the 6 mark, then I had some bad thunderstorms and it went up to 9 and it stayed there for many years after and never went back to normal.

      Since migrating to Sky LLU day 1 it was 15 then it decreased to 3 where it stays during the day and during night time it drops further to around 1 see below:

      ADSL Link Downstream Upstream
      Connection Speed 13308 kbps 1112 kbps
      Line Attenuation 35.0 db 19.9 db
      Noise Margin 1.4 db 8.3 db

      I am starting to get disconnection during the early hours of the morning which doesn't really affect my usage but obviously isn't ideal.

      Will it automatically fix itself after 14 days like it's supposed to do on ADSL Max?

      Cheers


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      Re: Very low SNR after migrating in from ADSL Max

      Are the stats taken from your test socket? If not please post your stats from your test socket.


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      Re: Very low SNR after migrating in from ADSL Max

      Yes they are from the test socket.

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      Re: Very low SNR after migrating in from ADSL Max

      Get in touch with sky and tell them to cap your line at a lower speed. This will take care of your disconnections.

      Alternatively you could ask them to put you on DLM again.

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      Re: Very low SNR after migrating in from ADSL Max

      Just reboot your router when the noise margin is low(below 7db) it will resync at a lower more stable speed. Switching the power off for a minute then on again is the best way to ensure a full resync.

      TomD


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


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      Re: Very low SNR after migrating in from ADSL Max

      Quote Originally Posted by Isitme View Post
      Just reboot your router when the noise margin is low(below 7db) it will resync at a lower more stable speed. Switching the power off for a minute then on again is the best way to ensure a full resync.
      Will I lose much of my sync rate by doing that? I thought the DSLAM was suppose to monitor disconnections and adjust your line appropriately? My connection has been up for over 72hrs now with no disconnections so not sure what to do.

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      Re: Very low SNR after migrating in from ADSL Max

      I can't really say how much you would loose, but the thing is that there is little point in syncing at a high rate when your throughput is slow. This happens when you have a very low noise margin which causes errors in the transmission. These errors mean the data has to be resent, which in some cases can half your actual speed. It is better to sync a bit lower and have a good stable throughput.

      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.





    9. #8
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      Re: Very low SNR after migrating in from ADSL Max

      Ok so I did what you said and my SNR has increased to 7.9 db - my line stats are as follows:

      ADSL Link Downstream Upstream
      Connection Speed 10766 kbps 1101 kbps
      Line Attenuation 35.0 db 20.1 db
      Noise Margin 7.9 db 7.7 db

      I have dropped sync by 2542 kbps is there anything I can do as the DMT tool says I should be able to get 13388 kbps on my line.

      Cheers

    10. #9
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      Re: Very low SNR after migrating in from ADSL Max

      If you reboot when your margin is above 7dbs it should resync a bit higher. It is a case of balancing your speed and noise margin to give you the best you can get. If you have the DMT tool working you may be able to set your margin with that. Start at about 6.5db and work your way down till you get a happy medium. The last thing you want to do is get Sky involved, they will stick a cap on your line and that will be that.

      As you say your line should support a bit more, but not much. An average line with an attenuation of 35db should give 10-12Mb, which you are within at the moment. Charts which say you can get 13-14Mb are based on a perfect line, unfortunately yours seems to have a fault or just be in generally poor condition.

      Has your throughput improved since you stabilised the line?

      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.





    11. #10
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      Re: Very low SNR after migrating in from ADSL Max

      I thought if I reboot when my margin is above 7 dbs my sync will lower again?

      I can use the DMT tool to decrease my SNR & increase my sync but I wasn't sure if my line would automatically do it for me so didn't want to mess around until I was sure. I guess this is not the case?

      Don't know what my throughput is, what it means and how to find it out tbh.

      Thnx

     

     
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