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    Low Snr Readings

    This is a discussion on Low Snr Readings within the Cabling and faceplate help forums, part of the Sky Broadband help and support category; I have noticed that the amount of connection drop outs has increased of late and I thought that I would ...

    1. #1
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      Low Snr Readings

      I have noticed that the amount of connection drop outs has increased of late and I thought that I would try and plug the router (via filter) direct into the engineers test socket.

      Instead of the SNR raising it's actualy dropped a bit which I didn't think would happen.

      Done everything else, ie switched off UPnP, Mosseywell Bounce, etc etc.

      Attached are the router stats before and after using the test socket, any ideas ???

      Before Test Socket Used

      /usr/sbin/adslctl: ADSL driver and PHY status
      Status: Showtime Channel: FAST, Upstream rate = 766 Kbps, Downstream rate = 15323 Kbps
      Link Power State: L0
      Mode: ADSL2+
      Channel: Fast
      Trellis: ON
      Line Status: No Defect
      Training Status: Showtime
      Down Up
      SNR (dB): 7.6 13.0
      Attn(dB): 27.0 14.3
      Pwr(dBm): 896.0 12.4
      Max(Kbps): 15552 884
      Rate (Kbps): 15323 766
      G.dmt framing
      K: 239(0) 14
      R: 16 16
      S: 1 16
      D: 64 4
      ADSL2 framing
      MSGc: 59 124
      B: 238 13
      M: 1 16
      T: 2 1
      R: 16 16
      S: 0.4980 8.6877
      L: 4096 221
      D: 64 4
      Counters
      SF: 258186 258184
      SFErr: 132562 1
      RS: 33564260 1097282
      RSCorr: 728488 0
      RSUnCorr: 290029 0

      HEC: 131382 0
      OCD: 1209 0
      LCD: 0 0
      Total Cells: 150285773 6544141
      Data Cells: 265095 26833
      Drop Cells: 0
      Bit Errors: 0 0

      ES: 2519 1
      SES: 2218 0
      UAS: 14 16
      Total time = 1 hours 9 min 59 sec
      SF = 258186
      CRC = 132562
      LOS = 0
      LOF = 0
      ES = 2519
      Latest 1 day time = 1 hours 9 min 59 sec
      SF = 258186
      CRC = 132562
      LOS = 0
      LOF = 0
      ES = 2519
      Latest 15 minutes time = 9 min 59 sec
      SF = 36998
      CRC = 36535
      LOS = 0
      LOF = 0
      ES = 597
      Previous 15 minutes time = 15 min 0 sec
      SF = 55591
      CRC = 30300
      LOS = 0
      LOF = 0
      ES = 576
      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 = 55652
      CRC = 22127
      LOS = 0
      LOF = 0
      ES = 449
      15 minutes interval [-45 min to -30 min] time = 15 min 0 sec
      SF = 55591
      CRC = 22960
      LOS = 0
      LOF = 0
      ES = 454
      15 minutes interval [-60 min to -45 min] time = 15 min 0 sec
      SF = 54354
      CRC = 20640
      LOS = 0
      LOF = 0
      ES = 443


      After Using Test Socket

      /usr/sbin/adslctl: ADSL driver and PHY status
      Status: Showtime Channel: FAST, Upstream rate = 766 Kbps, Downstream rate = 15323 Kbps
      Link Power State: L0
      Mode: ADSL2+
      Channel: Fast
      Trellis: ON
      Line Status: No Defect
      Training Status: Showtime
      Down Up
      SNR (dB): 7.6 12.0
      Attn(dB): 26.5 14.2
      Pwr(dBm): 0.0 12.4
      Max(Kbps): 15556 884
      Rate (Kbps): 15323 766
      G.dmt framing
      K: 239(0) 14
      R: 16 16
      S: 1 16
      D: 64 4
      ADSL2 framing
      MSGc: 59 124
      B: 238 13
      M: 1 16
      T: 2 1
      R: 16 16
      S: 0.4980 8.6877
      L: 4096 221
      D: 64 4
      Counters
      SF: 64793 64791
      SFErr: 149 1
      RS: 8423136 275361
      RSCorr: 7725 0
      RSUnCorr: 631 0

      HEC: 149 0
      OCD: 1 0
      LCD: 0 0
      Total Cells: 37916234 1893772
      Data Cells: 86246 12574
      Drop Cells: 0
      Bit Errors: 0 0

      ES: 20 1
      SES: 0 0
      UAS: 14 16
      Total time = 17 min 48 sec
      SF = 64793
      CRC = 149
      LOS = 0
      LOF = 0
      ES = 20
      Latest 1 day time = 17 min 48 sec
      SF = 64793
      CRC = 149
      LOS = 0
      LOF = 0
      ES = 20
      Latest 15 minutes time = 2 min 48 sec
      SF = 10439
      CRC = 0
      LOS = 0
      LOF = 0
      ES = 0
      Previous 15 minutes time = 15 min 0 sec
      SF = 54354
      CRC = 149
      LOS = 0
      LOF = 0
      ES = 20
      Previous 1 day time = 0 sec
      SF = 0
      CRC = 0
      LOS = 0
      LOF = 0
      ES = 0
      One day you are the pigeon, but most days just the statue ...


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    3. #2
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      Re: Low Snr Readings

      Your upstream noise margin dropped by 1db. I don't think that's likely to be at all significant of anything. It's just your router reacting to different connection characteristics.

      What you should be worrying about is the very high level of errors appearing in your stats. That's very probably the reason for your drop outs.

      With the normal connection your errors are very high. There are still errors with the test socket - a lot lower I think (the test period was rather short), but still high.

      You have noise both within your home phone wiring and on the line to the exchange.

    4. #3
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      Re: Low Snr Readings

      The BT box the router (wireless) is plugged into (still in the engineers test socket and showing 8.3d) is on the outside wall in the hall and goes straight out through the wall, I will try an ASDL faceplate that might solve the internal wiring noise but what could/can I do about the noise levels on the line ?.

      After trying the tesy socket last night it only dropped once and the Mosseywell Bounce brought it back up straight away.
      One day you are the pigeon, but most days just the statue ...

    5. #4
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      Re: Low Snr Readings

      All was stable for five and a half hours at 8.3db and all of a sudden it dropped to 4.1db and connection dropped.

      I am still plugged into engineers test socket, checked the back of the faceplate and ring wire was not attached. Any help appreciated.

      /usr/sbin/adslctl: ADSL driver and PHY status
      Status: Showtime Channel: FAST, Upstream rate = 766 Kbps, Downstream rate = 15323 Kbps
      Link Power State: L0
      Mode: ADSL2+
      Channel: Fast
      Trellis: ON
      Line Status: No Defect
      Training Status: Showtime
      Down Up
      SNR (dB): 4.1 11.0
      Attn(dB): 26.5 14.2
      Pwr(dBm): 23.3 12.4
      Max(Kbps): 16040 884
      Rate (Kbps): 15323 766
      G.dmt framing
      K: 239(0) 14
      R: 16 16
      S: 1 16
      D: 64 4
      ADSL2 framing
      MSGc: 59 124
      B: 238 13
      M: 1 16
      T: 2 1
      R: 16 16
      S: 0.4980 8.6877
      L: 4096 221
      D: 64 4
      Counters
      SF: 39406 39404
      SFErr: 38630 1
      RS: 5122912 167467
      RSCorr: 1819539 0
      RSUnCorr: 3051264 0

      HEC: 38789 0
      OCD: 101076 0
      LCD: 22 0
      Total Cells: 11888397 9704
      Data Cells: 7672 1
      Drop Cells: 0
      Bit Errors: 0 0

      ES: 628 1
      SES: 628 0
      UAS: 14 17
      Total time = 10 min 57 sec
      SF = 39406
      CRC = 38630
      LOS = 0
      LOF = 0
      ES = 628
      Latest 1 day time = 10 min 57 sec
      SF = 39406
      CRC = 38630
      LOS = 0
      LOF = 0
      ES = 628
      Latest 15 minutes time = 10 min 57 sec
      SF = 39406
      CRC = 38630
      LOS = 0
      LOF = 0
      ES = 628
      Previous 15 minutes time = 0 sec
      SF = 0
      CRC = 0
      LOS = 0
      LOF = 0
      ES = 0
      Previous 1 day time = 0 sec
      SF = 0
      CRC = 0
      LOS = 0
      LOF = 0
      ES = 0
      One day you are the pigeon, but most days just the statue ...

    6. #5
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      Re: Low Snr Readings

      A sudden drop of 4db in noise margin is not at all normal and suggests you have a line fault to me.

      Can you hear any crackling/hissing on voice calls? If so report it to BT.

    7. #6
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      Re: Low Snr Readings

      I did the BT 170707 noise test earlier but it was clear.

      Strange it's started to happen all of a sudden, bit windy here and a bit of rain but am stumped.

      I'm sure that if phone is working ok BT won't be too interested in my ADSL :-(
      One day you are the pigeon, but most days just the statue ...

    8. #7
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      Re: Low Snr Readings

      Not too sure what I am looking at on the last set of stats but the CRC seemed to jump from zero to over 38,000 !!! , would that be anything to do with it ?
      One day you are the pigeon, but most days just the statue ...

    9. #8
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      Re: Low Snr Readings

      No - the zero CRC periods covered 0 seconds ("Previous 15 minutes time = 0 sec").

      Both wind and rain are prime candidates for the cause of line problems. For example, chances are at some point your line to the exchange travels at least part of the way overground. Trees moving in the wind may be rubbing against the cable or compressing it. Underground cables are designed to cope with being immersed but sometimes the insulation fails - then there are the connectors inside the drop line box which you'd normally have at the point outside where the line enters your house.

      You're right BT won't take any notice with aa ADSL problem - you'll just have to discover a voice problem. (hint: intermittent fault)
      Last edited by Saturday; 12-05-07 at 05:51 PM.

    10. #9
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      Re: Low Snr Readings

      Thanks for your help, I'll keep my eye on the SNR and if it doesn't get any better I'll call BT with a 'phone line fault' complaint.
      One day you are the pigeon, but most days just the statue ...

    11. #10
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      Re: Low Snr Readings

      Wasn't sure if it would help but I changed the Sky microfilter and had a bit of an improvement.

      SNR went up to 7.8db and connection and download speeds went back up to

      CONX 15323 / 766 kbps
      DOWN 13183 / 657 kbps
      One day you are the pigeon, but most days just the statue ...

     

     
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