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    My Downstream SNR Margin is always in the range of 1.5 - 4 dB, is it good?

    This is a discussion on My Downstream SNR Margin is always in the range of 1.5 - 4 dB, is it good? within the Asking for help forums, part of the Broadband Technical Help category; I ask for technical support, which I cannot find already a month in the whole network. My ISP has made ...

    1. #1
      Levgorin's Avatar
      Levgorin is offline Sky User Member
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      My Downstream SNR Margin is always in the range of 1.5 - 4 dB, is it good?

      I ask for technical support, which I cannot find already a month in the whole network.
      My ISP has made some changes to my line. My Internet has become somewhat more stable than before. Now my modem shows that the Downstream SNR Margin is always in the range of 1.5 - 4 dB. But it is written everywhere that a stable Internet Downstream SNR Margin should not be below 6 - 7 dB.
      How so? Is there any technology that can provide this kind of work?
      And with this technology my modem for some reason, gives wrong information?


      It is impossible to clarify this issue with my ISP's. The Helpdesk people are technically illiterate, and I can not have contact with the real experts there.


      I know from experience that if the system works when it should not to work, this is usually ends badly. Such situation should not be left without attention.


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    3. #2
      Scubbie's Avatar
      Scubbie is offline Sky User Moderator
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      Re: My Downstream SNR Margin is always in the range of 1.5 - 4 dB, is it good?

      You must have a very long line.

      This forum is dedicated to Sky Customers based in the UK and Ireland. We generally deal with Sky Broadband issues not those of ISPs in Australia.

      As such our knowledge of Sky's systems is good, but extremely limited for your circumstances.

      Generally there are many things which will affect the line quality with ADSL signals.

      I would be inclined to check out what you can, avoid using any extension leads between your telephone socket and the router/modem and search for a forum for customers of your ISP.

      Sky Fibre Unlimited Pro: Connected at 80,000 kbps / 20,000 kbps
      Previous ADSL2+ Speed 19999 kbps 1153 kbps, Line Attenuation 17.5 db 6.9 db, Noise Margin 7.5 dB 8.7 dB
      Speedtest: 17.15MB/s 0.97Mb/s Ping 31 ms

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      dragon2611's Avatar
      dragon2611 is offline Sky User Member
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      Re: My Downstream SNR Margin is always in the range of 1.5 - 4 dB, is it good?

      A margin of 1.5db doesn't give much room for fluctuation therefore if it drops any further it's a likely to cause a resync, however providing the CRC/HEC errors aren't massively increasing and the Modem is keeping sync the low Noise margin on it's own isn't necessary a major problem.

      The Fluctuating noise margin would suggest either intermittent noise on the line or possibly varying crosstalk/external interference.

     

     

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