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    Speed variations - noise margin?

    This is a discussion on Speed variations - noise margin? within the Sky Broadband help forums, part of the Sky Broadband help and support category; Hi, new Sky Unimited customer about month ago as recently moved house. Speed seemed stable after training period but now ...

    1. #1
      locky's Avatar
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      Speed variations - noise margin?

      Hi, new Sky Unimited customer about month ago as recently moved house. Speed seemed stable after training period but now seems to be vary dropping from 8Mbps to 2-3Mbps.

      Only variation seems to be the noise margin which goes from 8-9dB to 3dB.

      Is this normal?

      If not what does it indicate?


      Current line stats

      ADSL Link Downstream Upstream
      Connection Speed 10233 kbps 1111 kbps
      Line Attenuation 38.0 dB 22.5 dB
      Noise Margin 6.0 dB 8.4 dB


      Speed test results

      Date ISP Test Result %
      10 Sep 2011, 20:41 Sky Broadband 16384 2586 16
      10 Sep 2011, 13:10 Sky Broadband 16384 7822 48
      10 Sep 2011, 08:22 Sky Broadband 16384 3241 20
      10 Sep 2011, 08:05 Sky Broadband 16384 2325 14
      10 Sep 2011, 08:04 Sky Broadband 16384 2807 17
      08 Sep 2011, 22:29 Sky Broadband 16384 4671 29
      07 Sep 2011, 21:50 Sky Broadband 16384 6277 38
      07 Sep 2011, 16:30 Sky Broadband 16384 7045 43
      06 Sep 2011, 21:59 Sky Broadband 16384 7582 46
      06 Sep 2011, 11:41 Sky Broadband 16384 6675 41
      05 Sep 2011, 23:39 Sky Broadband 16384 7952 49
      05 Sep 2011, 23:14 Sky Broadband 16384 2101 13
      05 Sep 2011, 22:06 Sky Broadband 16384 8007 49
      05 Sep 2011, 21:47 Sky Broadband 16384 6002 37
      05 Sep 2011, 20:11 Sky Broadband 16384 7871 48
      05 Sep 2011, 11:52 Sky Broadband 16384 8910 54
      04 Sep 2011, 23:09 Sky Broadband 16384 6441 39
      04 Sep 2011, 20:50 Sky Broadband 16384 6341 39
      04 Sep 2011, 20:47 Sky Broadband 16384 6094 37
      04 Sep 2011, 20:44 Sky Broadband 16384 6571 40
      04 Sep 2011, 20:41 Sky Broadband 16384 8327 51
      04 Sep 2011, 20:34 Sky Broadband 16384 4076 25
      04 Sep 2011, 09:37 Sky Broadband 16384 3574 22
      04 Sep 2011, 09:36 Sky Broadband 16384 5067 31
      04 Sep 2011, 09:33 Sky Broadband 8128 3212 44
      04 Sep 2011, 09:32 Sky Broadband 16384 3282 20
      13 Aug 2011, 07:07 Sky Broadband 10238 7964 78
      13 Aug 2011, 07:06 Sky Broadband 16384 7731 47
      13 Aug 2011, 07:05 Sky Broadband 16384 7179 44
      09 Aug 2011, 21:02 Sky Broadband 16384 7359 45
      09 Aug 2011, 14:15 Sky Broadband 16384 7096 43
      08 Aug 2011, 07:08 Sky Broadband 16384 5224 32
      05 Aug 2011, 22:02 Sky Broadband 8128 3403 47
      05 Aug 2011, 17:09 Sky Broadband 8128 3467 47
      05 Aug 2011, 17:08 Sky Broadband 8128 3369 46


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    3. #2
      Isitme's Avatar
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      Re: Speed variations - noise margin?

      The speed seems about right for your attenuation, but if the noise margin is dropping low, this will reduce the throughput. Plug into your Test socket if you have one using only the ADSL cable supplied by Sky and post your stats from there.

      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.





    4. #3
      locky's Avatar
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      Re: Speed variations - noise margin?

      So should I expect these measured speed variations? And would they correlate with the noise margin variations? I read that the noise margin will drop in the evening.

      I dont have a test socket.

      The only change after training period was that the router is connected by an extension from the phone socket.

      So I'll reconnect direct to the phone socket.

      If I want to use an extension which extension is best a phone or RJ11 and what should be the max length?

    5. #4
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      Re: Speed variations - noise margin?

      If you don't have a Test socket and you have extensions, try removing the wires from the number 3 terminal on the back of the faceplate, This is the ring wire and is not required when using filters. I assume you have filters plugged into the socket first in any that you are using. This includes the Sky digibox, which can be very troublesome if not properly filtered.

      If you are going to use a longer RJ11 cable, make sure it is a high quality one made up of twisted pair cable. Some of the so called 'highspeed' RJ11 cables are little more than telephone cable with RJ11 plugs on the ends, these are a waste of money. Up to 15M can be used with little drop in quality.

      One of the reasons for a sharp drop in throughput, in the evenings, especially when you are using wireless, is other networks come on line and interfere with yours. Are you using wireless?

      The noise margin often does come down with the darkness, but it should not drop enough to effect your speed. If it does you will have to look into the reason why it is dropping so much.

      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.





    6. #5
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      Re: Speed variations - noise margin?

      No extensions, just 2 wires connected to back of socket.

      Yes using Sky supplied filter.

      Using wireless, only 2 other wirelss networks in range all the time. Will also try connecting with LAN cable.

      So when it comes to using an extension from the phone socket to the router, is using a phone extension cable better or no different to a RJ11 extension? My distance is about 5m.

      The phone socket is a brass rope type

    7. #6
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      Re: Speed variations - noise margin?

      So when it comes to using an extension from the phone socket to the router, is using a phone extension cable better or no different to a RJ11 extension? My distance is about 5m.
      Using a phone extension cable is not recommended, as stated above use a high quality twisted pair RJ11 cable such as this - [ame=http://www.amazon.co.uk/Belkin-Hi-Speed-Internet-Modem-RJ11M-M/dp/B000FO6I4I/ref=dp_cp_ob_computers_title_1]Belkin Hi-Speed Internet Modem Cable RJ11M-M 7.6M: Belkin: Amazon.co.uk: Computers & Accessories[/ame]

      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.





    8. #7
      locky's Avatar
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      Re: Speed variations - noise margin?

      Repeated tests with router connected directly to phone socket and get same variation in speed test results. So dont believe phone extenstion cable is problem.

      Then connected laptop by ethernet cableto router and seem to be getting consistant speed results.

      Disconnecedt ethernet and get varied speed results again with wireless.

      So it seems wireless connection is causing speed variation.

      Is there any wireless setting that could be changed to improve this?

    9. #8
      Isitme's Avatar
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      Re: Speed variations - noise margin?

      Is there any wireless setting that could be changed to improve this?
      Only the channel the router is broadcasting on. Download and install Inssider from the link below. Use it to find the channels being used in your area. Set your router channel to one as far from those in use as possible.. You will have to check the channels in use at various times, as all wireless networks are not switched on 24/7.

      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.





    10. #9
      locky's Avatar
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      Re: Speed variations - noise margin?

      Used in SSIDer and there were 2 other networks in range. All on channel 1, so changed mine to channel 6.

      Last night it seemed my wireless speeds were more stable but this morning they seem to vary from 3-8Mbps, whereas the ethernet connection is consistant at about 8-9Mbps. Using Speedtest.net for all tests.

      So my conclusion is that its down to my wireless network, not my connections from router to phone socket.

      I've got both laptops and router in the same room for test purposes, so wireless range is not the problem.

      The router is the new N router from Sky. My laptops are using b/g wireless cards.

      Is there any need to adjust the router wireless settings from AUTO?

    11. #10
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      Re: Speed variations - noise margin?

      Is there any need to adjust the router wireless settings from AUTO?
      If there is an option to use 'g' or 'b/g' only set it to that. If you do not have N devices there is no need to waste resources on broadcasting N.

      When your speed is low, check with Inssider if another network has come on line. I would also try changing the channel to 11 or even 13.

      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.





     

     
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