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    Failing to maintain SNR

    This is a discussion on Failing to maintain SNR within the Sky Broadband help forums, part of the Sky Broadband help and support category; Hi all, Just a quick thank you to everyone on this forum. Although this is my first post this site ...

    1. #1
      l_grundy's Avatar
      l_grundy is offline Sky User Member
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      Unhappy Failing to maintain SNR

      Hi all,

      Just a quick thank you to everyone on this forum. Although this is my first post this site has been a valuable source of information

      However, recently I have been experiencing connection dropouts on far too many occasions. I have been on Sky MAX for 3 weeks now, and was syncing at aroun 3.5 meg, which was acceptable. However now i cant seem to sync at anything greater than 2.3 meg and dropouts occur between every 30 minutes and 3 hours.

      Here are some stats:

      /usr/sbin/adslctl: ADSL driver and PHY status
      Status: ShowtimeRetrain Reason: 0
      Channel: INTR, Upstream rate = 768 Kbps, Downstream rate = 2336 Kbps
      Link Power State: L0
      Mode: G.DMT
      Channel: Interleave
      Trellis: ON
      Line Status: No Defect
      Training Status: Showtime
      Down Up
      SNR (dB): 2.8 14.0
      Attn(dB): 57.0 31.5
      Pwr(dBm): 18.1 11.8
      Max(Kbps): 2656 1120
      Rate (Kbps): 2336 768
      G.dmt framing
      K: 74(0) 25
      R: 16 16
      S: 2 8
      D: 64 8
      ADSL2 framing
      MSGc: 1 1
      B: 76 25
      M: 2 8
      T: 1 1
      R: 16 16
      S: 2.2077 8.6153
      L: 616 208
      D: 64 8
      Counters
      SF: 685164 685117
      SFErr: 51596 0
      RS: 23295608 5823494
      RSCorr: 15608852 94
      RSUnCorr: 100828 0

      HEC: 40197 0
      OCD: 1 0
      LCD: 0 0
      Total Cells: 64080800 0
      Data Cells: 2877363 0
      Drop Cells: 0
      Bit Errors: 0 0

      ES: 6179 0
      SES: 676 0
      UAS: 45 0
      AS: 11649

      INP: 6.64 2.46
      PER: 1.93 1.88
      delay: 35.32 17.23
      OR: 28.98 29.71

      Bitswap: 0 0

      Total time = 3 hours 38 min 27 sec
      SF = 767112
      CRC = 51596
      LOS = 0
      LOF = 0
      ES = 6179
      Latest 1 day time = 3 hours 38 min 27 sec
      SF = 767112
      CRC = 51596
      LOS = 0
      LOF = 0
      ES = 6179
      Latest 15 minutes time = 8 min 27 sec
      SF = 29854
      CRC = 12170
      LOS = 0
      LOF = 0
      ES = 503
      Previous 15 minutes time = 15 min 0 sec
      SF = 52923
      CRC = 12977
      LOS = 0
      LOF = 0
      ES = 879
      Previous 1 day time = 0 sec
      SF = 0
      CRC = 0
      LOS = 0
      LOF = 0
      ES = 0
      15 minutes interval [-30 min to -15 min] time = 15 min 0 sec
      SF = 52923
      CRC = 9977
      LOS = 0
      LOF = 0
      ES = 876
      15 minutes interval [-45 min to -30 min] time = 15 min 0 sec
      SF = 52923
      CRC = 7672
      LOS = 0
      LOF = 0
      ES = 866
      15 minutes interval [-60 min to -45 min] time = 15 min 0 sec
      SF = 52982
      CRC = 3321
      LOS = 0
      LOF = 0
      ES = 726
      Showtime Drop Reason: 0
      Last Retrain Reason: 0

      This is from being connected for around 3 hours, when first synced the SNR was around 8db.

      Can anyone see what my problem is from the stats?

      Thanks very much.


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    3. #2
      Saturday's Avatar
      Saturday is offline Sky User Super Mod
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      Re: Failing to maintain SNR

      Quote Originally Posted by l_grundy View Post
      Can anyone see what my problem is from the stats?
      Certainly can

      You had a noise margin of only 2.8db when you took the stats. Below ~6db most people experience some problem. Below ~5db and you're entering disconnection territory.

      Have a look at the first sticky in my signature for some ideas of how to sort this. Plus see the cabling and faceplate help forum as you probably have a line problem (are you using an extension?).

    4. #3
      l_grundy's Avatar
      l_grundy is offline Sky User Member
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      Re: Failing to maintain SNR

      No there are no extensions in the house, and the cabling is plugged directly into the socket (the faceplate has been removed). There is also a Sky Box and DECT Phone plugged into the filter.

      When I reset the router it syncs at 8db but soon drops to the level shown in the stats, and it gets rather frustrating having to reboot the router every half hour.
      Last edited by l_grundy; 12-10-07 at 06:28 PM. Reason: Spelling mistake

    5. #4
      Saturday's Avatar
      Saturday is offline Sky User Super Mod
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      Re: Failing to maintain SNR

      If your router is plugged into the test socket (the one hidden behind the faceplate) and you're getting massive drops in noise margin (3-4db would be normal) then either you have a BT line/exchange problem or a faulty filter/digibox/phone. To determine whether it is the latter set, try another microfilter and also don't plug the digibox and phone in. Still getting the massive drop?

      Also, I don't quite understand the drop then reboot thing. When it drops and you reboot, it should be back to ~7db. If it drops again and you keep rebooting then it has to level out.

     

     

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