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    Line Att and Noise Margin?

    This is a discussion on Line Att and Noise Margin? within the Sky Broadband (Fibre) Help forums, part of the Sky Broadband help and support category; Can someone explain what these are? Are they are indicator of how fast a speed a line will support? Is ...

    1. #1
      psychocandy's Avatar
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      Line Att and Noise Margin?

      Can someone explain what these are? Are they are indicator of how fast a speed a line will support?

      Is higher better? Whats a good score and whats bad?
      Every day when I wake up I thank the Lord I'm Welsh


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      Re: Line Att and Noise Margin?

      Line attenuation is in relation to "loop loss" on your line. The lower this figure the better and the better chance you have of getting the faster speeds.The further you are from the exchange the higher your attenuation figure will be as the signal loss increases.

      SNR is Signal to Noise Ratio,the higher your SNR is the better as there is less background noise. SNR fluctuates on all lines throughout the course of the day by various amounts. Signal strength is usually best during the early part of the day.
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      Re: Line Att and Noise Margin?

      I believe on a vDSL line these are mainly an indication of the condition of the copper line between your house and the fibre cabinet. The attenuation and noise on a fibre line is negligible.

      TomD


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      Re: Line Att and Noise Margin?

      So whats a good figure?
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      Re: Line Att and Noise Margin?

      There is no such thing as 'good figures' Provided the noise margin is high enough to overcome any noise on the line, that is good enough. For most, a margin of 6db is sufficient to do this, anything higher is a bonus.

      TomD


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      Re: Line Att and Noise Margin?

      Right. I always thought that the higher the noise margin the higher the possible speed.

      So almost 20db is pretty good I guess.
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      Re: Line Att and Noise Margin?

      Quote Originally Posted by psychocandy View Post
      Right. I always thought that the higher the noise margin the higher the possible speed.

      So almost 20db is pretty good I guess.
      That is so. Your margin indicates that you could get a lot more speed, as I think I have mentioned before. If your noise margin was 5-6 dbs it would indicate your line was near maximum and could take little more.

      TomD


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


      Useful Utilites

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





     

     

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