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    Download Speed Collapses

    This is a discussion on Download Speed Collapses within the Sky Broadband help forums, part of the Sky Broadband help and support category; I took your advice and set the nm to 10 and the connection is very stable, apart from the error ...

    1. #21
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      Re: Download Speed Collapses

      I took your advice and set the nm to 10 and the connection is very stable, apart from the error surge which I didn't notice.


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    3. #22
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      Re: Download Speed Collapses

      Yes, this period seems to be particularly bad.-
      Previous 15 minutes time = 15 min 0 sec
      SF = 55875
      CRC = 11140
      LOS = 0
      LOF = 0
      ES = 181

      This occurred in the 1/2 hour or so before the stats were taken. If you can identify this in real time, it may give you an idea what is causing it. Unfortunately, if it is happening outside your house, there is not much you can do about it. It could, for instance, be an large AC unit switching on close to your line.

      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.





    4. #23
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      Re: Download Speed Collapses

      The wireless connection speed dropped again last night. I rebooted at about 21.00 hrs and the speed recovered to around 6mbps but was vary variable. I noticed that the wireless channel was set to 6 and not channel 1, which I had been using as it gave me the best results. I reset the channel to 1 and it has been good for over 24 hours. The wireless speed is now very similar to the wired speed on the PC. Is it possible that this was the cause of my reducing speeds in the evenings? As I found out yesterday, the errors all came over a very short period of time. I have monitored the stats over the last 24 hours and there has been no sudden surge of errors. I left the nm at the value it set at the time of rebooting, which was 7.1. During the day the nm value increased to 8.5 and fell back again tonight. However, there was no disconnect so I guess this nm/sync speed is about right for my line.
      I do not understand why the errors all came over the same short period. If the line was noisy then would the errors not occur at other times?
      Anyway, these are the 24 hour stats with the phone connected.


      /usr/sbin/adslctl: ADSL driver and PHY status
      Status: Showtime Channel: FAST, Upstream rate = 764 Kbps, Downstream rate = 14265 Kbps
      Link Power State: L0
      Mode: ADSL2+
      Channel: Fast
      Trellis: ON
      Line Status: No Defect
      Training Status: Showtime
      Down Up
      SNR (dB): 7.3 13.0
      Attn(dB): 25.5 13.1
      Pwr(dBm): 921.6 12.4
      Max(Kbps): 14268 864
      Rate (Kbps): 14265 764
      G.dmt framing
      K: 239(0) 24
      R: 16 16
      S: 1 8
      D: 64 8
      ADSL2 framing
      MSGc: 114 68
      B: 238 23
      M: 1 8
      T: 1 1
      R: 16 16
      S: 0.5338 7.7037
      L: 3821 216
      D: 64 8
      Counters
      SF: 5651872 5651870
      SFErr: 634 1
      RS: 678224654 48040895
      RSCorr: 12811138 587202588
      RSUnCorr: 34857 0

      HEC: 640 0
      OCD: 0 0
      LCD: 0 0
      Total Cells: 3045563715 163153808
      Data Cells: 6154186 1318181
      Drop Cells: 0
      Bit Errors: 0 0

      ES: 20 1
      SES: 11 0
      UAS: 14 16
      Total time = 1 days 1 hours 9 min 5 sec
      SF = 5651872
      CRC = 634
      LOS = 0
      LOF = 0
      ES = 20
      Latest 1 day time = 1 hours 9 min 5 sec
      SF = 258802
      CRC = 0
      LOS = 0
      LOF = 0
      ES = 0
      Latest 15 minutes time = 9 min 5 sec
      SF = 34083
      CRC = 0
      LOS = 0
      LOF = 0
      ES = 0
      Previous 15 minutes time = 15 min 0 sec
      SF = 56180
      CRC = 0
      LOS = 0
      LOF = 0
      ES = 0
      Previous 1 day time = 24 hours 0 sec
      SF = 5393070
      CRC = 634
      LOS = 0
      LOF = 0
      ES = 20
      15 minutes interval [-30 min to -15 min] time = 15 min 0 sec
      SF = 56179
      CRC = 0
      LOS = 0
      LOF = 0
      ES = 0
      15 minutes interval [-45 min to -30 min] time = 15 min 0 sec
      SF = 56243
      CRC = 0
      LOS = 0
      LOF = 0
      ES = 0
      15 minutes interval [-60 min to -45 min] time = 15 min 0 sec
      SF = 56117
      CRC = 0
      LOS = 0
      LOF = 0
      ES = 0

    5. #24
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      Re: Download Speed Collapses

      I have just been ploughing through some of the threads and after reading one post, the penny dropped.
      All my problems started when I upgraded from mid to max and I experienced reducing wireless connection speed, especially in the evenings
      I had messed around with the various settings to optimise my connection speed immediately after the upgrade.
      One of the settings I changed was wireless mode, going from g&b to auto 108Mbps and then back again.
      I have found that channel 1 works best for me and channel 6 has always given problems.
      I didn't pickup that selecting Auto 108 changes the channel to channel 6 and when even if you revert back to g&b it stays on 6 until you manually change it.
      I have been on channel 1 for two days again and touch wood all seems ok.
      I think the spasmodic noise on the line producing errors is not a problem as with the settings I now have the connection appears to be stable.

    6. #25
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      Re: Download Speed Collapses

      The spasmodic noise problems continues. It is very strange. I can go for 24 hours with very few errors and then suddenly, over a very short period, the recorded errors leap and even though the line remains connected, the download speed falls. If I reboot the router, the speed recovers.
      The past two days I have been operating in G.DMT mode and my question is what determines the synch speed in this mode? This mode is very stable. My stats in this mode are below.

      /usr/sbin/adslctl: ADSL driver and PHY status
      Status: Showtime Channel: INTR, Upstream rate = 768 Kbps, Downstream rate = 7616 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 14.0
      Attn(dB): 22.0 14.0
      Pwr(dBm): 19.8 8.9
      Max(Kbps): 8448 1216
      Rate (Kbps): 7616 768
      G.dmt framing
      K: 239(0) 25
      R: 16 16
      S: 1 8
      D: 64 8
      ADSL2 framing
      MSGc: 57 68
      B: 238 23
      M: 1 8
      T: 2 1
      R: 16 16
      S: 0.5091 7.7037
      L: 4007 216
      D: 64 8
      Counters
      SF: 5428073 5428071
      SFErr: 0 0
      RS: 369109028 46138603
      RSCorr: 117 146
      RSUnCorr: 0 0

      HEC: 0 0
      OCD: 0 0
      LCD: 0 0
      Total Cells: 1657502068 0
      Data Cells: 3811403 0
      Drop Cells: 0
      Bit Errors: 0 0

      ES: 0 1
      SES: 0 0
      UAS: 77 16
      Total time = 1 days 1 hours 42 min 30 sec
      SF = 5428073
      CRC = 0
      LOS = 0
      LOF = 0
      ES = 0
      Latest 1 day time = 1 hours 42 min 30 sec
      SF = 361809
      CRC = 0
      LOS = 0
      LOF = 0
      ES = 0
      Latest 15 minutes time = 12 min 30 sec
      SF = 44167
      CRC = 0
      LOS = 0
      LOF = 0
      ES = 0
      Previous 15 minutes time = 15 min 0 sec
      SF = 52931
      CRC = 0
      LOS = 0
      LOF = 0
      ES = 0
      Previous 1 day time = 24 hours 0 sec
      SF = 5066264
      CRC = 0
      LOS = 0
      LOF = 0
      ES = 0
      15 minutes interval [-30 min to -15 min] time = 15 min 0 sec
      SF = 52989
      CRC = 0
      LOS = 0
      LOF = 0
      ES = 0
      15 minutes interval [-45 min to -30 min] time = 15 min 0 sec
      SF = 52930
      CRC = 0
      LOS = 0
      LOF = 0
      ES = 0
      15 minutes interval [-60 min to -45 min] time = 15 min 0 sec
      SF = 52931
      CRC = 0
      LOS = 0
      LOF = 0
      ES = 0

    7. #26
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      Re: Download Speed Collapses

      Well the 24 hr period above is 100% errors free! Might be worth going wired with ethernet then if the problem goe's away then you know for sure you have wireless problems.

    8. #27
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      Re: Download Speed Collapses

      If the line is noisy, would the error surge appear on both ADSL+ and G.DMT?

    9. #28
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      Re: Download Speed Collapses

      Yes but to a lesser degree, G.DMT handles it better. But your stats above show no errors at all? Which leads me to believe you may still have wireless issues. If you try with the ethernet cable then that should prove it one way or other.

    10. #29
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      Re: Download Speed Collapses

      This is all very thought provoking.
      Just to confirm, what you are suggesting is connecting using ADSL+ but only having the PC with the ethernet cable switched on.
      When I do a stats check, are the reported errors picked up in the PC or Laptop or are they picked up in the router?
      Last edited by castro; 05-09-07 at 11:18 AM.

    11. #30
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      Re: Download Speed Collapses

      I am getting as confused as you!
      The detailed stats are held in the router and report on the condition of the connection to the outside world, i.e. the phone line. They dont report the condition of the wireless connection. So if you connect an ethernet cable between one of the ports on your router and your computer if thing improve you will know its your wireless connection causing the problem.

     

     
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