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    Intermittent disconnections

    This is a discussion on Intermittent disconnections within the Sky Broadband help forums, part of the Sky Broadband help and support category; There seems to be a recurring intermittent problem with my Broadband connection, previously it was every few weeks but recently ...

    1. #1
      DesertRaven's Avatar
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      Intermittent disconnections

      There seems to be a recurring intermittent problem with my Broadband connection, previously it was every few weeks but recently it’s every couple of days. I’ve tried both the Faceplate splitter and in the Test Socket, same result.

      I’ve checked for interference around the house by turning the power off to everything except for the DG834GT (Sky firmware and default settings).

      Looking at the router logs it sometimes has entries that the Link Control Protocol is down, but mostly nothing is logged:
      Sat, 2011-02-05 18:36:19 - LCP down.
      Sat, 2011-02-05 18:36:26 - Initialize LCP.
      Sat, 2011-02-05 18:36:26 - LCP is allowed to come up.
      Sat, 2011-02-05 18:36:51 - CHAP authentication success

      (Also see the attachment for the RouterStats trace during the issue.)

      I previously tried plugging in an old BT Voyager modem when the problem was occurring to see if it was the DG834GT but it also dropped the connection in the same way. I can’t hear any crackling on the line so my guess is that it’s something at the Exchange - e.g., dodgy port.

      Any ideas before I give Sky a call?

      ADSL Link Downstream Upstream
      Connection Speed 4608 kbps 832 kbps
      Line Attenuation 54.0 db 31.5 db
      Noise Margin 7.8 db 7.0 db

      Thanks
      Attached Thumbnails Attached Thumbnails Intermittent disconnections-routerstats.jpg  
      Last edited by DesertRaven; 06-02-11 at 11:19 AM.


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    3. #2
      Scubbie's Avatar
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      Re: Intermittent disconnections

      I'd give them a call at this point.

      You've eliminated there being a potential problem with the router, your filters and the telephone wiring within your home (after the master socket).

      If they start delaying you, I would refer them to the image you've posted.

      Good luck.

      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

    4. #3
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      Re: Intermittent disconnections

      Turning power off to things in your home may not do anything, REIN problems can come from some distance. Do these problems only arise at the same times or constantly throughout the day? The error logs all seem to be evening times?
      run-IT-direct, For all your networking, ADSL & telecom requirements.

    5. #4
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      Re: Intermittent disconnections

      I'll leave RouterStats running to see if there are any patters - it does occur more around the weekend evenings (Friday especially).

      Reading here Identifying Sources of Radio Frequency Interference Around the Home they suggest using an AM radio tuned to 150 kHz to detect possible RFI sources.

      If it is RFI the source could be anywhere along the 4km line - as it only runs 3m above ground...although it's cable-tied to a shielded CAT6 line for those 2.5 of those meters. Could that be acting as an ariel?

    6. #5
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      Re: Intermittent disconnections

      Cat 6 cable is shielded and shouldn't act to attract radio noise from other sources.

      As for the AM frequencies, try contacting your nearest Amateur Radio club. It sounds like someone is either pushing too many amps or their aerial hasn't been setup in properly. This should be easy to identify.

      It would also be worth discussing with your neighbours to see if they are experiencing similar problems. This would help to rule this out if they are fine.

      I know that some people in West London were sending computer transmissions over the CB waves some 12 years back. The software exists and they could easily migrate onto the AM frequency. AM can be more directional than FM with the correct setup.

      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

    7. #6
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      Re: Intermittent disconnections

      Quick update:

      Fortunately it's not RFI as the router has been working all week without issue, then when I took a look at the line stats the Upstream Line Attenuation had oddly dropped from 31.5 db which it's always been to 25 db

      I stupidly rebooted the router, the attenuation value returned to 31.5 followed by the constant line drops once again. However overnight the value change to 25 db and the line is stable again.

      ADSL Link Downstream Upstream
      Connection Speed 4512 kbps 832 kbps
      Line Attenuation 54.0 db 25.0 db Noise Margin 7.5 db 7.0 db

      Anyway 28 lighter after talking to Sky they're sending a new router.

      Will let you know if it fixes the issue.

      Thanks All

    8. #7
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      Re: Intermittent disconnections

      Have you considered running RouterStats -Lite and logging the noise & connection speed?

      This may indicate whether there is a line issue.

      I'd also suggest considering doing with both your existing router and the new one that Sky has sent out.

      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

    9. #8
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      Re: Intermittent disconnections

      The new router just arrived, Sky D-Link (Sky_1.11)

      Plugged it in and no problems so far

      Stats with the D-Link (all connections etc., are the same)

      ADSL Link Downstream Upstream
      Connection Speed 4544 kbps 864 kbps
      Line Attenuation 53.5db 27.0db
      Noise Margin 6.8db 8.0db

      (Test time 13:30)

      Downstream Attenuation is 0.5 db lower than the DG834GT.
      The Upstream Attenuation is 27 db (DG834GT was reporting 25 db the other day) which is still lower than the historical 31.5 db it's been for the last four years.

      Conclusion:
      • The D-link looks to be squeezing a bit more out of my line than the 4 year old DG834GT.
      • For some reason the Upstream attenuation improved by about 4.5 db for no obvious reason some time last week!
      • Someone (BT) has sprayed a white box with the letter FTTC on the path just next to my Green Street Cabinet, maybe BT are clearing up the wiring en'route.

    10. #9
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      Re: Intermittent disconnections

      Well done, not a huge improvement, but a difference.

      Keep an eye on things though. Should you start experiencing disconnection issues again, try Router Stat - Lite. Also post up the full stats from your router if this happens.

      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. #10
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      Re: Intermittent disconnections

      The slight increase in speed is probably down to the lower noise margin. Boot at a busy time and it will be back where it was, or lower.

      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

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