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    Noise margin question

    This is a discussion on Noise margin question within the Sky Router forums, part of the Sky Broadband help category; I have been reading threads on this forum about noise margin, when it drops low making the connection drop when ...

    1. #1
      Andy17's Avatar
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      Noise margin question

      I have been reading threads on this forum about noise margin, when it drops low making the connection drop when the margin gets to 3 to 4db, these are my current stats below. "Not on DLM"

      ADSL Link Downstream Upstream
      Connection Speed 10239 kbps 796 kbps
      Line Attenuation 39.5 db 23.0 db
      Noise Margin 5.4 db 13.5 db

      But the margin can go as low as 2db, but the connection works fine, speedtests are the same, it doesn't seem to matter how low the margin goes the connection never seems to stall. Just woundering if this is normal.
      Connected at 17Mbps on sky unlimited


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    3. #2
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      Re: Noise margin question

      Normally a noise margin is set at around 7db. If it works without disconnecting leave it alone. You may want to invest in a filtered faceplate and connect the rounter into that eventually.

      It is on the verge of dropping when it gets low so don't be surprised if it does every now and them.

    4. #3
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      Re: Noise margin question

      i already have a filtered faceplate in use.

      Have never had problems with connection at all.
      Connected at 17Mbps on sky unlimited


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    5. #4
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      Re: Noise margin question

      Quote Originally Posted by Andy17 View Post
      the margin can go as low as 2db, but the connection works fine, speedtests are the same, it doesn't seem to matter how low the margin goes the connection never seems to stall.
      With the new firmware some people find the connection holds right down to 0db. Others find their connection fails earlier than that. I suspect the difference is that some people have more "bursty" noise and this gives the router real problems.

      In your own case a noise margin of 2db will be causing problems but obviously not serious enough for you to notice. What will be happening though is that some data will be corrupted and need retransmitting, so lowering your throughput.

      I suspect that what you will find however is that when Sky turn on DLM for existing connections later this year, your sync may get put down/noise margin up. But who knows, maybe DLM V2 has a bit more intelligence built in than the original version (assuming there is a V2 and they're not just rolling out the same thing as last time).

      BTW, looking at your upstream noise margin you have been through DLM already. That would have been a few months back, in the DLM trial, and you didn't get hit too bad (or at all) by the look of things.
      Last edited by Saturday; 13-01-09 at 11:45 PM.

    6. #5
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      Re: Noise margin question

      Well saying that the DLM did knock back my connect speed but i asked for the speed to be put back so they did only tuck 2 days from sending email to the end result.
      Connected at 17Mbps on sky unlimited


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    7. #6
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      Re: Noise margin question

      Looks like they missed the upstream sync out then and left that at the DLM figure.

    8. #7
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      Re: Noise margin question

      I ask them to change the downstream speed and leave other settings the same and they did.
      Connected at 17Mbps on sky unlimited


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