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    Random 2MB Drop/Decreased Noise Margin

    This is a discussion on Random 2MB Drop/Decreased Noise Margin within the Sky Broadband help forums, part of the Sky Broadband help and support category; hi there, I have had this line activated for around 12months now, initially it was syncing fine at 10mb/1.2 on ...

    1. #1
      flamey's Avatar
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      Random 2MB Drop/Decreased Noise Margin

      hi there,

      I have had this line activated for around 12months now, initially it was syncing fine at 10mb/1.2 on a dg834gv5 however one day when I reset the router I could only attain a maximum of 8mb, and noticed I had a 4db SNR drop at any time of day. For example, previously I had 11db at 8mb sync now obviously I have 7.

      I have tried the normal, switch filters/routers/rj11 and currently syncing with a 7800n therefore decreased upload sync.

      I was thinking DLM could have adjusted the INP profile causing this I am at 1/2symbol now but didn't check before. Or perhaps a engineer has messed with something cabinet/exchange, very odd as havn't had this on any other lines previously. Attenuation reported has increased slightly from what I remember, the 834v5 now reports 44db whereas previously I am sure it was around 41db

      Wondered if you have any thoughts,

      thanks!

      Basic stats:

      Upstream 870
      Downstream 7540
      SNR Margin(Upstream) 6.5
      SNR Margin(Downstream) 6.1
      Line Attenuation(Upstream) 23.5
      Line Attenuation(Downstream) 42.0

      Detailed Stats:

      Link Power State: L0
      Mode: ADSL2+
      TPS-TC: ATM Mode
      Trellis: U:ON /D:ON
      Line Status: No Defect
      Training Status: Showtime
      Down Up
      SNR (dB): 6.1 6.5
      Attn(dB): 42.0 23.5
      Pwr(dBm): 6.5 10.6
      ADSL2 framing
      MSGc: 59 66
      B: 234 27
      M: 1 4
      T: 1 1
      R: 16 16
      S: 0.9930 3.9689
      L: 2022 258
      D: 32 8
      Counters
      SF: 12455357 921153
      SFErr: 2323 0
      RS: 809598258 544136
      RSCorr: 998128 426868882
      RSUnCorr: 60986 0

      HEC: 1864 0
      OCD: 451 0
      LCD: 0 0
      Total Cells: 3574239934 477232
      Data Cells: 822317107 532093
      Drop Cells: 0
      Bit Errors: 0 0

      ES: 2230 4
      SES: 13 0
      UAS: 104 104
      AS: 200999

      INP: 1.01 1.98
      PER: 16.13 17.86
      delay: 7.94 7.93
      OR: 32.22 32.25

      Bitswap: 8130 3798

      Total time = 1 days 10 hours 37 min 24 sec
      FEC: 1836155 470450652
      CRC: 5153 4
      ES: 2230 4
      SES: 13 0
      UAS: 104 104
      LOS: 1 0
      LOF: 9 0
      Latest 15 minutes time = 7 min 24 sec
      FEC: 3549 0
      CRC: 13 0
      ES: 6 0
      SES: 0 0
      UAS: 0 0
      LOS: 0 0
      LOF: 0 0
      Previous 15 minutes time = 15 min 0 sec
      FEC: 4186 4587522
      CRC: 9 0
      ES: 4 0
      SES: 0 0
      UAS: 0 0
      LOS: 0 0
      LOF: 0 0
      Latest 1 day time = 10 hours 37 min 24 sec
      FEC: 332295 91095406
      CRC: 668 0
      ES: 300 0
      SES: 0 0
      UAS: 0 0
      LOS: 0 0
      LOF: 0 0
      Previous 1 day time = 24 hours 0 sec
      FEC: 308865 173719477
      CRC: 819 0
      ES: 413 0
      SES: 0 0
      UAS: 0 0
      LOS: 0 0
      LOF: 0 0
      Since Link time = 2 days 7 hours 50 min 0 sec
      FEC: 998128 426868882
      CRC: 2323 0
      ES: 1122 0
      SES: 0 0
      UAS: 0 0
      LOS: 0 0
      LOF: 0 0
      Last edited by flamey; 22-11-11 at 02:35 AM.


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    3. #2
      timc's Avatar
      timc is offline Sky User Member
      Exchange: Hadleigh, Essex
      Broadband ISP: BT Infinity
      Router: Billion 7800N
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      Re: Random 2MB Drop/Decreased Noise Margin

      The thing that I've noticed is that your power is way down ie Pwr(dBm): 6.5 10.6.

      This should be more like 12dB & 18dB I believe. Not sure of the reasons for this though.

    4. #3
      rftk's Avatar
      rftk is offline Sky User Member
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      Re: Random 2MB Drop/Decreased Noise Margin

      They did some line upgrade in my area and ever since , I've had no end of trouble , My upstream drops dramatically on a speed check site , just done s test now and it's pulling in 548kbps , the upstream speed is 176k , it's usually around 400kbps , the downside to this is I can't upload anything as it takes forever as i say I had no problems till some upgrade was done a few weeks ago

     

     

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