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    Help understanding noise margin

    This is a discussion on Help understanding noise margin within the Asking for help forums, part of the Broadband Technical Help category; hi i have read the post regarding the noise margin and to "power up your router at the time of ...

    1. #1
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      Help understanding noise margin

      hi i have read the post regarding the noise margin and to "power up your router at the time of highest noise" that way it will sync and stay steady.....at what time of day is the noisest time of day, is that the evening time. should i re start my router in the evening and leave it on or start it in the morning and leave it on??

      thanks


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    3. #2
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      sorry i should have said my current stats are:

      ADSL Link Downstream Upstream
      Connection Speed 7905 kbps 764 kbps
      Line Attenuation 29.0 db 15.6 db
      Noise Margin 7.1 db 9.0 db

    4. #3
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      The noisiest time of day is typically the evening between about 5pm and 11pm but you may find variations through the day.

      To "lock" your router to a high noise margin do the following:
      • open a separate browser window, log into the router and open up the stats page and leave it open
      • if your noise margin is at 6.5db or lower then reboot.
      • keep your eye on the stats from time to time - if it reaches or drops below 6.5db again then reboot
      • keep doing this until it stops dropping
      • then leave your router connected to the phone socket and powered up - if you power off then you'll have to start again


      Alternatively have a look at Mognuts utility in the sticky in the Tech Discussion forum. With this you can change your noise margin at will.

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      why not just do the mognuts utility anyway or is it a bit fiddlely?

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      No, not at all fiddly and would certainly be my preferred method.

      However, it may be a little intimidating or confusing for a non technical user. As you didn't indicate your technical comfort zone (and as this is a public forum and this post will be read by others), I included both.

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      what sort of dB figures are we looking for, what is average and what is high for noise margin?

      thanks for all your help Saturday!

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      It doesn't quite work like that.

      Left to its own devices, the Sky router syncs with the exchange at the highest speed it can for a noise margin of 6.9db or greater.

      Trial and error has found that the router begins to misbehave a bit below 6.5db and really plays up below ~5.8db. As noise margin varies through the day this can be a problem.

      Your aim must be to keep your noise margin above 6.5db. What you need to set it at to achieve this will depend on how much noise varies on your particular line. Remember, if you set it too high you are needlessly sacrificing speed.

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      hi, i restarted my router about an hour ago when it was around 7.0db and now my stats are:

      ADSL Link Downstream Upstream
      Connection Speed 10998 kbps 764 kbps
      Line Attenuation 28.0 db 15.5 db
      Noise Margin 9.3 db 13.0 db

      they have been like this for about an hour, should i leave it on from now on do you suggest?


      thanks

    10. #9
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      Yes, you should never need to power off your router in the normal course of things.

      Keep an eye on the margin. Reboot it if it drops below ~6.5db later or tomorrow. You can do this through the router admin pages rather than powering off to reboot.

     

     

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