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    Will these Noise Margin figures slow my connection?

    This is a discussion on Will these Noise Margin figures slow my connection? within the Sky Broadband help forums, part of the Sky Broadband help and support category; Originally Posted by pgnl So are you saying that the end result after DLM will likely to be lower than ...

    1. #11
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      Re: Will these Noise Margin figures slow my connection?

      Quote Originally Posted by pgnl View Post
      So are you saying that the end result after DLM will likely to be lower than it is now?
      As it stands, yes.

      Quote Originally Posted by pgnl View Post
      Also, do you think it's worth interrupting DLM to disconnect the hard wired extensions, so I can try connecting the router without them?
      Definitely if this is affecting your line speed.

      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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    3. #12
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      Re: Will these Noise Margin figures slow my connection?

      Super quick reply, thanks...

      I'll have some free time on Sunday so will give it a go then... Many thanks..



      Patrick

    4. #13
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      Re: Will these Noise Margin figures slow my connection?

      Quote Originally Posted by pgnl View Post
      Super quick reply, thanks...

      I'll have some free time on Sunday so will give it a go then... Many thanks..
      I've been out all day, so I'm just catching up.

      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

    5. #14
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      Re: Will these Noise Margin figures slow my connection?

      As a follow up for you all, DLM started on the third and finished yesterday (I was expecting it to run for 10 days) reporting as follows

      Your connection details
      Line connection testing completed on 08/06/2011
      Download Speed
      Your connection has been set to a download speed of up to 12.0Mb (12288Kb)
      Upload Speed
      Your connection has been set to an upload speed of up to 1.0Mb (1024Kb)


      My stats are now as follows:

      ADSL Link Downstream Upstream
      Connection Speed 12284 kbps 945 kbps
      Line Attenuation 33.0 dB 19.3 dB
      Noise Margin 3.8 dB 14.7 dB

      The speeds actually didn't fluctuate that much during DLM and are only slightly reduced to the highest I've seen. I'm very dog with a bone with all this though and if there's a way of tweaking I will do it. per my post here Old BT Junction Box

      I shall be following all the advice I've been given and making a few modifications to our 30 year old phone wiring:

      • Namely removing the ancient surge box
      • Adding an NTE5a
      • Adding a plug in faceplate (XTE2005?)
      • Locating the router next to the master socket and using homeplugs to route the ethernet signal. (I've just had a mains point installed by our neighbour who's an electrician)
      • Isolating all extensions for phone only use via the plug in faceplate.


      Before I do all that, I will check it's actually worth bothering by briefly connecting the a/b cables as they enter the house to the back of the NTE5a and plugging the router into the test socket.

      I'll let you know how I get on.

      Thanks for all your help and advice - don't you just love the internet?

      Patrick

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      Re: Will these Noise Margin figures slow my connection?

      Noise Margin 3.8 dB 14.7 dB
      That is a very low noise margin. You might find it will drop out or your actual thoughput will be low. I would reboot and accept a slightly lower sync if I were you.

      TomD


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


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    7. #16
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      Re: Will these Noise Margin figures slow my connection?

      Others have said that, I know it should be around 6/7 download. Presumably if the figure was higher than 7 there would be room for a small speed increase?

      It has been remarkably stable through DLM (and I have downloaded a lot!) The download noise fluctuates between 4.3 and 3.7, when all the bits have arrived, I will make the changes listed and I am hoping the noise figure will improve, if it doesn't there's not much I can do about it is there?

      Patrick

    8. #17
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      Re: Will these Noise Margin figures slow my connection?

      It is possible the router will perform OK with a low noise margin. But in many cases the throughput with a low margin, is badly effected. If you download speed is consistently about 10500kbps or around 1.25MBps, you will be OK.

      As you say, if you make the internal improvements your margin, and maybe even your speed will improve, if they don't then it is a poor external line which you can't do much about..

      TomD


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


      Useful Utilites

      http://www.nirsoft.net/utils/wifi_information_view.html/ TCPOptimiser /Test Socket

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





    9. #18
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      Re: Will these Noise Margin figures slow my connection?

      Well I have finally had chance to have a mess with the wiring as it comes into the house.

      I removed the two surge plates from inside of the OLD GPO box to temporarily disconnect everything and I attached a back master socket faceplate to the two terminals with the incoming orange/white with blue/white - white blue respectively. Then plugged in the Router to the test socket via a supplied filter.

      The stats we as follows:
      ADSL Link Downstream Upstream
      Connection Speed 11559 kbps 945 kbps
      Line Attenuation 32.5 dB 19.0 dB
      Noise Margin 7.1 dB 14.9 dB

      So a slight decrease in download attenuation and an increase Download Noise Margin.

      I then put it all back as it was and plugged the router via a filter into the existing oldstyle master socket and got the following:
      ADSL Link Downstream Upstream
      Connection Speed 10849 kbps 945 kbps
      Line Attenuation 33.0 dB 19.1 dB
      Noise Margin 7.1 dB 15.0 dB

      (I restarted the router inbetween by the way)..

      It's now wired via homeplugs, so I will leave it at that for the moment, but will replace the master socket shortly anyway..

      Strangely though speeds today have gone down not up - it seems the DL speed decreases everytime you reboot anyway. Will it recover in time?

      Patrick

    10. #19
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      Re: Will these Noise Margin figures slow my connection?

      Your noise margin is now around 7dB. This is Sky's target and should also mean that your connection is far more stable.

      Whilst a nice high downstream figure is desirable, if your line is not able to support it, then you are likely to pick up more errors. By having the noise margin increased to around 7dB, these errors should be minimised and the actual through-put of your connection will benefit.

      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

    11. #20
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      Re: Will these Noise Margin figures slow my connection?

      Many thanks for the advice Scubbie...

      Patrick

     

     
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