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    Internet Disconnection

    This is a discussion on Internet Disconnection within the Sky Broadband help forums, part of the Sky Broadband help and support category; The problem I'm having with the internet is at night the internet disconnects and then reconnects. What usually happens is ...

    1. #1
      harminderdhak's Avatar
      harminderdhak is offline Sky User Member
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      Internet Disconnection

      The problem I'm having with the internet is at night the internet disconnects and then reconnects. What usually happens is the speed will drop to 0 kpbs downstream and upstream and the router will say negotiating, then the router disconnects from the internet completely and then assigns the LAN IP Address, Default Gateway, Primary DNS Server, Secondary DNS Server. I'm not sure if iv'e stated the correct terms, sorry if i haven't.

      This only seems to happen at night though and not in the day.

      Iv'e read around the forums and got statistics from several routers and the test socket if they are helpful.

      I got statistics from 3 routers from the Master Socket at 1 pm:

      Netgear DG834GT Firmware Version v1.2.19

      DownstreamUpstream

      Line Attenuation 42.5 db 23.4
      Noise Margin 10.0 db 16.5 db
      Connection Speed 6731 kbps 606 kbps

      Netgear DG834GT Firmware Version v1.2.04

      DownstreamUpstream

      Line Attenuation 42.5 db 23.7
      Noise Margin 9.3 db 17.0 db
      Connection Speed 7005 kbps 606 kbps

      BT Voyager 2091

      Downstream,Upstream

      Line Attenuation 44.0 db 21.6
      Noise Margin 8.0 db 17.5 db
      Connection Speed 7005 kbps 606 kbps

      I then got stats from the Test Socket using the BT Voyager:

      Line Mode ADSL2+
      Line Power State L0
      Line Coding Trellis On

      Statistics Downstream Upstream
      Line Rate 7005 Kbps, 606 Kbps
      Noise Margin 7.4 dB, 17.5 dB
      Line Attenuation 43.5 dB, 21.7 dB
      Output Power 1.0 dBm, 12.8 dBm
      MSGC (number in overhead channel data) 59, 68
      B (number of bytes in Mux Frame) 30, 18
      M (number of Mux Frames in FEC Frame) 1, 8
      T (Mux Frames over sync bytes) 7, 1
      R (number of check bytes in FEC Frame) 14, 16
      S (ratio of FEC over PMD Frame length) 0.1410, 7.5932
      L (number of bits in PMD Frame) 2554, 177
      D (interleaver depth) 352, 8
      Delay 12 msec, 15 msec
      Super Frames 14324, 14322
      Super Frame Errors 0, 1
      RS Words 6517638, 121737
      RS Correctable Errors 19, 0
      RS Uncorrectable Errors 0, 0
      HEC Errors 0, 0
      OCD Errors 0, 0
      LCD Errors 0, 0
      ES Errors 0, 0

      The stats were retrieved using brand new filters and cables.

      The problems have been happening with the netgear (first one from above)

      Iv'e changed router now to the BT voyager to see if that was the problem but i doubt it is.

      Help would be appreciated

      thanks


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    3. #2
      Andy17's Avatar
      Andy17 is offline Sky User Member
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      Re: Internet Disconnection

      Use the sky router and connect to the test socket and post the stats on here, they look like this

      ADSL Link Downstream Upstream
      Connection Speed 14000 kbps 1199 kbps
      Line Attenuation 43.0 db 18.5 db
      Noise Margin 7.45 db 8.0 db

      Then the fault finding can go further, also pick the phone up press a number to get rid of the dial tone and listen for any noise crack and pops etc.

    4. #3
      Isitme's Avatar
      Isitme is offline Sky User Moderator
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      Re: Internet Disconnection

      What firmware are you using on the DG834GT, non-standard? The latest Sky firmware is V1.03.87

      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.





    5. #4
      harminderdhak's Avatar
      harminderdhak is offline Sky User Member
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      Re: Internet Disconnection

      Yes im running standard netgear firmware.

      test socket stats using netgear are:

      ADSL Link Downstream, Upstream
      Connection Speed 7005 kbps, 606 kbps
      Line Attenuation 42.5 db, 23.4 db
      Noise Margin 8.0 db, 16.2 db

      There is no hiss or pops are nothing.

    6. #5
      Andy17's Avatar
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      Re: Internet Disconnection

      Quote Originally Posted by harminderdhak View Post
      Yes im running standard netgear firmware.

      test socket stats using netgear are:

      ADSL Link Downstream, Upstream
      Connection Speed 7005 kbps, 606 kbps
      Line Attenuation 42.5 db, 23.4 db
      Noise Margin 8.0 db, 16.2 db

      There is no hiss or pops are nothing.
      That may be all your line can give and is at its limit, other than a external line fault somewhere there is nothing else that can be done.
      I would say external line fault myself.

    7. #6
      Isitme's Avatar
      Isitme is offline Sky User Moderator
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      Re: Internet Disconnection

      It looks like you may have one of those lines which suffers sudden noise spikes causing disconnections. You could try downloading and running Router stats Lite from here-
      RouterStats -Lite

      This will enable you to track your noise margin and possibly isolate what is causing it. There are another couple of guys on the forum who are having a bad time with a similar problem.

      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
      harminderdhak's Avatar
      harminderdhak is offline Sky User Member
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      Re: Internet Disconnection

      Ok thank you for your help people, much apprieciated.

      I've been reading and saw that my noise margins seem a tad low so decided to install the DG teams firmware on my Netgear and altered the SNR pecentage to get some more reliability and conceding some speed. Will this have any chance of helping me keeping a connection? I also read that i should keep aware of my downstream noise margin and reboot the router when near 6db to get a higher noise margin. Will that be any good as if you say its just noise spikes?

    9. #8
      taro999's Avatar
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      Re: Internet Disconnection

      Hi there, I received an email from sky notifying about the changes in speed and BB packages, and am wondering if it's got anything to do with that.
      In the mail they say that they are fiddling to get the max speed for each connection.
      Like yours, my line is also getting disconnected and reconnected at night times and I remember the same thing happening back in january I think this year when they were doing the DLM thing. This discon/recon thing went on for about a week or two I think until they eventually messed up my settings (Sky changed my ADSL2+ to G.DMT which was totally unneccessary!!!) and I started getting a hundred disconnection per day....had to call them to get it back to what was a perfect line.
      Perhaps sky are going through a similar procedure right now.

      It's all just a guess. Maybe I'm wrong...but at least you're not alone with this one.

    10. #9
      Isitme's Avatar
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      Re: Internet Disconnection

      Will that be any good as if you say its just noise spikes?
      It depends on how large the spikes are. Some are experiencing spikes of 13-14dbs, if yours is the same you would have to sacrifice an awful lot of speed to stabilise your line. Booting your router when the speed drops below 6dbs should resync you at a lower speed. Continuing to do this will eventually set the router to its most stable speed. Leaving it to reboot itself when it needs to will achieve the same thing, provided you do not reboot when the noise margin is high, or you will just start the cycle over again. There was no need to flash the Sky firmware to do this, it could have been done with the CU firmware or one of the applications like BSR , DMT or Sky Netgear DG834GT utility version 0.3 The latest version of Sky firmware runs very well, there is little need to use Standard or DGteam firmware as there was with the first version.

      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.





    11. #10
      harminderdhak's Avatar
      harminderdhak is offline Sky User Member
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      Re: Internet Disconnection

      The spikes were taking my noise margin from around 7/8 to 0 so i wouldn't know exactly how strong they are.

      I suppose i just wait this situation out and see what happens. One difference i had with the DG firmware was when the noise margin went to 0 the router didn't disconnect the reconnect, it just seem to stayed connected which was nice.

     

     
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