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    noise margins

    This is a discussion on noise margins within the Sky Broadband help forums, part of the Sky Broadband help and support category; hi all could someone please explain to me what causes the noise margins on the upstream ,mines seems to fluctuate ...

    1. #1
      ah1604's Avatar
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      Question noise margins

      hi all could someone please explain to me what causes the noise margins on the upstream ,mines seems to fluctuate from highs of 16db to 1.7db is this trying to tell me that there is noise on my line,is there anything you can tell me from these stats

      adsl: ADSL driver and PHY status
      Status: ShowtimeRetrain Reason: 8000
      Channel: FAST, Upstream rate = 415 Kbps, Downstream rate = 3102 Kbps
      Link Power State: L0
      Mode: ADSL2+
      Channel: Fast
      Trellis: U:ON /D:ON
      Line Status: No Defect
      Training Status: Showtime
      Down Up
      SNR (dB): 7.3 12.9
      Attn(dB): 60.5 33.2
      Pwr(dBm): 17.5 12.6
      Max(Kbps): 3836 634
      Rate (Kbps): 3102 415
      G.dmt framing
      K: 12(0) 6
      R: 14 16
      S: 16 16
      D: 32 8
      ADSL2 framing
      MSGc: 60 15
      B: 11 5
      M: 16 16
      T: 8 7
      R: 14 16
      S: 1.9595 7.2258
      L: 841 124
      D: 32 8
      Counters
      SF: 58814 59444
      SFErr: 176 339
      RS: 1940884 525966
      RSCorr: 7031 225910
      RSUnCorr: 3296 0

      HEC: 149 2844
      OCD: 12 0
      LCD: 0 0
      Total Cells: 6954995 49031778
      Data Cells: 3487908 2113597
      Drop Cells: 0
      Bit Errors: 0 184414

      ES: 585 91
      SES: 104 25
      UAS: 1161 1044
      AS: 951

      INP: 2.13 4.12
      PER: 16.16 16.59
      delay: 15.67 14.45
      OR: 32.66 10.12

      Bitswap: 65 12

      Total time = 23 hours 50 min 22 sec
      SF = 5211670
      CRC = 12641
      LOS = 25
      LOF = 99
      ES = 585
      Latest 1 day time = 23 hours 50 min 22 sec
      SF = 5211670
      CRC = 12641
      LOS = 25
      LOF = 99
      ES = 585
      Latest 15 minutes time = 5 min 22 sec
      SF = 19915
      CRC = 20
      LOS = 0
      LOF = 0
      ES = 2
      Previous 15 minutes time = 15 min 0 sec
      SF = 52916
      CRC = 976
      LOS = 2
      LOF = 9
      ES = 30
      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 = 55449
      CRC = 410
      LOS = 1
      LOF = 0
      ES = 22
      15 minutes interval [-45 min to -30 min] time = 15 min 0 sec
      SF = 55387
      CRC = 252
      LOS = 0
      LOF = 0
      ES = 25
      15 minutes interval [-60 min to -45 min] time = 15 min 0 sec
      SF = 55387
      CRC = 195
      LOS = 0
      LOF = 0
      ES = 28
      Showtime Drop Reason: 8000
      Last Retrain Reason: 8000


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    3. #2
      ah1604's Avatar
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      Re: noise margins

      Wont matter they have put me back on DLM so will need to wait

    4. #3
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      Re: noise margins

      Upstream noise margin problems can sometimes be caused by a poor filter. Try using another filter.

      Try plugging into your Test socket if you have one and post your stats from there.
      How to test your ADSL in the Master Test Socket

      With the errors you have, DLM will probably reduce your speed further. I think they would have been better putting your line on G.DMT(ADSL1) this is often better on long lines such as yours. It may be worth calling them and asking them to try your line on that mode.

      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
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      Re: noise margins

      thanks for the reply Isitme,

      i went to monitor my line today for some reason ive been switched to G.DMT and i didnt even phone them,so i checked my sky email and there was a email from sky saying they manually configured my line plus he didnt even notice the DLM was running at the time he set it,do you know if they can lower the delays any more currently pinging sky @ 47ms


      adsl: ADSL driver and PHY status
      Status: ShowtimeRetrain Reason: 1
      Channel: INTR, Upstream rate = 416 Kbps, Downstream rate = 3200 Kbps
      Link Power State: L0
      Mode: G.DMT
      Channel: Interleave
      Trellis: ON
      Line Status: No Defect
      Training Status: Showtime
      Down Up
      SNR (dB): 7.8 16.0
      Attn(dB): 58.0 31.5
      Pwr(dBm): 17.9 7.0
      Max(Kbps): 3488 1016
      Rate (Kbps): 3200 416
      G.dmt framing
      K: 101(0) 14
      R: 16 16
      S: 2 16
      D: 32 4
      ADSL2 framing
      MSGc: 59 13
      B: 12 3
      M: 16 16
      T: 8 7
      R: 14 16
      S: 1.9932 7.8048
      L: 891 82
      D: 32 8
      Counters
      SF: 1026362 1026308
      SFErr: 24 4
      RS: 34896338 4361809
      RSCorr: 9948 170
      RSUnCorr: 100 0

      HEC: 17 3
      OCD: 0 0
      LCD: 0 0
      Total Cells: 131684515 0
      Data Cells: 994468 0
      Drop Cells: 0
      Bit Errors: 0 0

      ES: 278 0
      SES: 16 0
      UAS: 130 50
      AS: 17448

      INP: 2.01 6.24
      PER: 16.19 16.21
      delay: 15.94 15.60
      OR: 32.10 9.37

      Bitswap: 0 0

      Total time = 1 days 20 hours 32 min 34 sec
      SF = 1086481
      CRC = 446
      LOS = 6
      LOF = 36
      ES = 278
      Latest 1 day time = 20 hours 32 min 34 sec
      SF = 1086481
      CRC = 446
      LOS = 3
      LOF = 27
      ES = 116
      Latest 15 minutes time = 2 min 34 sec
      SF = 9027
      CRC = 0
      LOS = 0
      LOF = 0
      ES = 0
      Previous 15 minutes time = 15 min 0 sec
      SF = 52982
      CRC = 1
      LOS = 0
      LOF = 0
      ES = 1
      Previous 1 day time = 24 hours 0 sec
      SF = 0
      CRC = 0
      LOS = 3
      LOF = 9
      ES = 162
      15 minutes interval [-30 min to -15 min] time = 15 min 0 sec
      SF = 52923
      CRC = 2
      LOS = 0
      LOF = 0
      ES = 1
      15 minutes interval [-45 min to -30 min] time = 15 min 0 sec
      SF = 52923
      CRC = 5
      LOS = 0
      LOF = 0
      ES = 3
      15 minutes interval [-60 min to -45 min] time = 15 min 0 sec
      SF = 52982
      CRC = 1
      LOS = 0
      LOF = 0
      ES = 2
      Showtime Drop Reason: 1
      Last Retrain Reason: 1

    6. #5
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      Re: noise margins

      G.DMT mode has reduced your errors considerably. You are now well within an acceptable rate.

      Did you ask for your delay to be reduced? Unless you are a keen online gamer a highish ping will make no difference, but getting it reduced can increase errors and cause your speed to be further reduced.

      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.





     

     

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