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    Can anyone tell me if these are any good?

    This is a discussion on Can anyone tell me if these are any good? within the Sky Broadband help forums, part of the Sky Broadband help and support category; Hello, Can anyone tell me if these stats are any good for my connection with regards to the attenuation and ...

    1. #1
      brucemac's Avatar
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      Can anyone tell me if these are any good?

      Hello,

      Can anyone tell me if these stats are any good for my connection with regards to the attenuation and noise margin?


      ADSL Link Downstream Upstream
      Connection Speed 11998 kbps 766 kbps
      Line Attenuation 29.0 db 14.2 db
      Noise Margin 10.9 db 12.3 db

      This is before i was recapped again to 10mb

      whats a good figure to have for noise is the lower the better? Is this the same for attenuation?


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    3. #2
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      I'm no expert, but here's something i've copied and pasted from elsewhere,

      but I believe it to give a fairly good indication as to speeds.

      Noise Margins:
      6dB or below is bad and will experience no synch or intermittent synch problems
      7dB-10dB is fair but does not leave much room for variances in conditions
      11dB-20dB is good with little or no synch problems
      20dB-28dB is excellent
      29dB or above is outstanding

      Line Attenuation:
      20dB and below is outstanding
      20dB-30dB is excellent
      30dB-40dB is very good
      40dB-50dB is good
      50dB-60dB is poor and may experience connectivity issues
      60dB or above is bad and will experience connectivity issues

      Hope this helps a bit.

    4. #3
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      Quote Originally Posted by Andy_G View Post
      I'm no expert, but here's something i've copied and pasted from elsewhere,

      but I believe it to give a fairly good indication as to speeds.

      Noise Margins:
      6dB or below is bad and will experience no synch or intermittent synch problems
      7dB-10dB is fair but does not leave much room for variances in conditions
      11dB-20dB is good with little or no synch problems
      20dB-28dB is excellent
      29dB or above is outstanding

      Line Attenuation:
      20dB and below is outstanding
      20dB-30dB is excellent
      30dB-40dB is very good
      40dB-50dB is good
      50dB-60dB is poor and may experience connectivity issues
      60dB or above is bad and will experience connectivity issues

      Hope this helps a bit.
      How do you test this?

    5. #4
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      Do these figures apply to BOTH ADSL2+ and standard ADSL? I'm thinking more in relation to the Noise Margins.

      spcdust

    6. #5
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      Noise Margins:
      6dB or below is bad and will experience no synch or intermittent synch problems
      7dB-10dB is fair but does not leave much room for variances in conditions
      11dB-20dB is good with little or no synch problems
      20dB-28dB is excellent
      29dB or above is outstanding
      I would have thought that you could only make a statement like this for fixed-rate products.

      The thing with rate-adaptive products is that they use the SNR margin to set the stable sync rate.

      So you can have a low sync rate with a high SNR margin. But what a rate-adaptive solution will do is to use the extra SNR margin to increase the sync rate - so in practice everyone should be seeing more or less the same SNR margin but with different sync rates.

      Cheers,

      Nigel

    7. #6
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      I believe that a higher noise margin is great for ADSL1 fixed connections like 1mb & 2mb, but the margin should be lower if you want a higher speed ADSL2+ connection.

    8. #7
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      Thanks for the reply, looks like more investigation work is taking place tonight and another call to sky, it has been higher yet they keep dropping my download speed yet that keeps dropping also!

      Been online a week!!

     

     

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