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    Trouble with download speed

    This is a discussion on Trouble with download speed within the Sky Broadband help forums, part of the Sky Broadband help and support category; Some general advice required, from those more knowledgable than myself, before I vent direct to Sky. I have had Sky ...

    1. #1
      Bloater's Avatar
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      Trouble with download speed

      Some general advice required, from those more knowledgable than myself, before I vent direct to Sky.

      I have had Sky max for some time now, late last year rings a bell, and up till now, things haven't been too bad. With an attenuation of 44dB Sky refused to connect me via ADSL2+ in order to maintain a stable connection. This connection was just over the 6Mb mark. All seemed well, until about 2 months ago, where every evening I had to reboot the router, as the noise margin had dropped into the 5's and nothing would work. Fair enough I thought, it is the evening.

      However I have had to continually reboot the router over the last few weeks, on average every other evening, and the connection speed always drops to get back to a sensible noise margin. Now my connection is under the 5Mb mark, and so I have lost over 1Mb of connection speed, and I am not happy about it.

      So before I go to Sky and ask them why, my attenuation is still 44dB, any suggestions from the kowledge base on here. If I continue like this, I'll end up with no connection at all. I thought for 44dB I should be in excess of 6Mb anyway, but Sky says not, in fact Sky says don't believe the speed checkers, personally, I don't believe Sky.

      I know the noise margin drops in the evenings, but I seem to be having a cumulative thing happening. It drops the sync speed to get the noise margin, then a couple of evenings later, I have to do it again, and so lose some more of my sync speed.

      I have tried the obvious, removed the ring wire, checked the filters etc, but no good. Also bear in mind that my attenuation has stayed at 44dB throughout.

      Any thoughts??

      Bloater


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    3. #2
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      Re: Trouble with download speed

      Your attenuation determines the maximum sync speed. Noise will then reduce this. It would appear your line has noise.

    4. #3
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      Re: Trouble with download speed

      Thanks Saturday - I know my line has noise, hence the lower than expected initial sync speed.

      My question is why however is my line getting slower. As I tried to explain, my inital sync was 6.1 Mb with a NM of about 8. It worked well, no problems. Then during the evening, the NM dropped to the 6's, so I rebooted the router to get a better connection. A sync of 5.9 or so got the NM back to nearer 8. I expected the NM to then go higher during the following day, but it didn't, it stayed there, and then dropped again resulting in a further reboot, and re-sync at 5.7Mb.

      This has continued over the last few weeks, such that now I am down to 4.9Mb, and last night the NM was below 7 again. I left it. I can't understand why the NM does not return to a higher level during the day, and then drop back down in the evening. All mine seems to do is keep droppping, thus requiring a reboot, and thus losing yet more connection speed. Throughout all this my attenuation has stayed at 44dB

      So what to do? Sky to investigate the issues - highely unlikely. Or report a fault to BT, stating that my line appears to be getting more noise on it on a daily basis.

      Cheers

    5. #4
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      Re: Trouble with download speed

      Could try posting your detailed stats see if we can spot anything. Also check uPNP is switched off.

      Go to the utility web site: Sky Netgear DG834GT utility version 0.4
      Click the “Get” detailed modem stats button and click “OK”.
      Enter the router login user name and password.
      At the next screen, click the back button on your browser.
      Click the “Download” netgear.cfg button.
      What you do next depends on your operating system. On Windows XP, click the “Save” button to save the file to your hard disk. (If you click “Open”, you may find that the file association is one that doesn’t handle carriage returns the same way as the router, hence the reason for saying “Save”.)
      Open the file in WordPad (not notepad).

    6. #5
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      Re: Trouble with download speed

      Have you tried your test socket to check it's not noise that's being introduced locally?

    7. #6
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      Re: Trouble with download speed

      Here you go, detailed stats. I see the problem I think.

      /usr/sbin/adslctl: ADSL driver and PHY status
      Status: Showtime Channel: INTR, Upstream rate = 768 Kbps, Downstream rate = 4928 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): 44.0 27.0
      Pwr(dBm): 19.8 9.9
      Max(Kbps): 5568 1184
      Rate (Kbps): 4928 768
      G.dmt framing
      K: 155(0) 25
      R: 16 16
      S: 1 8
      D: 64 8
      ADSL2 framing
      MSGc: 1 1
      B: 155 25
      M: 1 8
      T: 1 1
      R: 16 16
      S: 1.1025 8.6153
      L: 1248 208
      D: 64 8
      Counters
      SF: 14536931 14536929
      SFErr: 67423 168
      RS: 988511326 123563896
      RSCorr: 679919226 1966
      RSUnCorr: 86797 0

      HEC: 56311 150
      OCD: 4 0
      LCD: 0 0
      Total Cells: 2872201378 0
      Data Cells: 21000668 0
      Drop Cells: 0
      Bit Errors: 0 0

      ES: 24564 0
      SES: 366 0
      UAS: 21 0
      Total time = 1 days 20 hours 39 min 20 sec
      SF = 14536931
      CRC = 67423
      LOS = 347
      LOF = 0
      ES = 24564
      Latest 1 day time = 20 hours 39 min 20 sec
      SF = 4374054
      CRC = 49280
      LOS = 119
      LOF = 0
      ES = 13069
      Latest 15 minutes time = 9 min 20 sec
      SF = 32935
      CRC = 268
      LOS = 4
      LOF = 0
      ES = 202
      Previous 15 minutes time = 15 min 0 sec
      SF = 52989
      CRC = 2312
      LOS = 0
      LOF = 0
      ES = 713
      Previous 1 day time = 24 hours 0 sec
      SF = 5082263
      CRC = 13130
      LOS = 103
      LOF = 0
      ES = 8206
      15 minutes interval [-30 min to -15 min] time = 15 min 0 sec
      SF = 52930
      CRC = 996
      LOS = 0
      LOF = 0
      ES = 573
      15 minutes interval [-45 min to -30 min] time = 15 min 0 sec
      SF = 52931
      CRC = 3568
      LOS = 0
      LOF = 0
      ES = 815
      15 minutes interval [-60 min to -45 min] time = 15 min 0 sec
      SF = 52930
      CRC = 3609
      LOS = 0
      LOF = 0
      ES = 833


      What to do with all these errors. A month ago I was on 6.1 Mb with the same attenuation, and the same noise margin. Is this a BT thing. I am plugged in to the master socket, will try the test socket.

      Bloater

    8. #7
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      Re: Trouble with download speed

      I have just tested in the test socket, and connected at 6144 kbps with a noise margin of 10.9. I have now reconnected everything back as it was, and have a connection of 6144 kbps and a noise margin of 10.8. All I need now is for Sky to remove the cap they have put on the line, and see how fast we can go. I also checked some other sockets around the house, and removed ring wires where I found them.

      Here's hoping its fixed.

      Bloater

    9. #8
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      Re: Trouble with download speed

      you won't get over 8mb but should see 7...
      -------------------------------------------



      Useful Sticky: - How To Obtain Your Router Stats, BT Speed Test, Check For Test Socket

    10. #9
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      Re: Trouble with download speed

      More stats after the fix. SNR has stayed at 10.1 and above all evening, and the log below shows considerably less errors. I know its only been a short while, but looks good so far.

      /usr/sbin/adslctl: ADSL driver and PHY status
      Status: Showtime Channel: INTR, Upstream rate = 768 Kbps, Downstream rate = 6144 Kbps
      Link Power State: L0
      Mode: G.DMT
      Channel: Interleave
      Trellis: ON
      Line Status: No Defect
      Training Status: Showtime
      Down Up
      SNR (dB): 10.1 14.0
      Attn(dB): 44.0 27.0
      Pwr(dBm): 19.8 9.3
      Max(Kbps): 7552 1216
      Rate (Kbps): 6144 768
      G.dmt framing
      K: 193(0) 25
      R: 16 16
      S: 1 8
      D: 64 8
      ADSL2 framing
      MSGc: 1 1
      B: 193 25
      M: 1 8
      T: 1 1
      R: 16 16
      S: 1.0824 8.6153
      L: 1552 208
      D: 64 8
      Counters
      SF: 681566 681564
      SFErr: 11 0
      RS: 46346530 5793294
      RSCorr: 10349151 154
      RSUnCorr: 158 0

      HEC: 11 0
      OCD: 0 0
      LCD: 0 0
      Total Cells: 167906171 0
      Data Cells: 3471514 0
      Drop Cells: 0
      Bit Errors: 0 0

      ES: 11 0
      SES: 4 0
      UAS: 50 0
      Total time = 3 hours 14 min 30 sec
      SF = 681566
      CRC = 11
      LOS = 4
      LOF = 0
      ES = 11
      Latest 1 day time = 3 hours 14 min 30 sec
      SF = 681566
      CRC = 11
      LOS = 4
      LOF = 0
      ES = 11
      Latest 15 minutes time = 14 min 30 sec
      SF = 51166
      CRC = 2
      LOS = 0
      LOF = 0
      ES = 1
      Previous 15 minutes time = 15 min 0 sec
      SF = 52930
      CRC = 0
      LOS = 0
      LOF = 0
      ES = 0
      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 = 52990
      CRC = 1
      LOS = 1
      LOF = 0
      ES = 1
      15 minutes interval [-45 min to -30 min] time = 15 min 0 sec
      SF = 52930
      CRC = 2
      LOS = 0
      LOF = 0
      ES = 2
      15 minutes interval [-60 min to -45 min] time = 15 min 0 sec
      SF = 52931
      CRC = 0
      LOS = 1
      LOF = 0
      ES = 1


      Cheers.

      Bloater

    11. #10
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      Re: Trouble with download speed

      Hi,

      I have been having a similar type of problem.

      I have had my connection for about 6 months now and have nevr been happy with it

      I thought i had cracked it when i removed the BT face plate and plugged direct into the test socket , got a connection of aroun6.2 which i was well happy with considering i am 2.4km away from the exchange and have a line attenuation of 50db

      However whenever i leave the computer for a little time i come back only to find it has dropped to 1000kbps or even 100kbps with the attenuation still at 50db but a very high noise margin of around 24 or something

      This has got worse recently and i am really frustrated!!

      Any ideas ?

      stats are below!

      cheers,

      isohunter

      /usr/sbin/adslctl: ADSL driver and PHY status
      Status: Showtime Channel: INTR, Upstream rate = 768 Kbps, Downstream rate = 1376 Kbps
      Link Power State: L0
      Mode: G.DMT
      Channel: Interleave
      Trellis: ON
      Line Status: No Defect
      Training Status: Showtime
      Down Up
      SNR (dB): 26.8 12.0
      Attn(dB): 50.0 31.5
      Pwr(dBm): 18.1 12.5
      Max(Kbps): 1536 1024
      Rate (Kbps): 1376 768
      G.dmt framing
      K: 44(0) 25
      R: 16 16
      S: 4 8
      D: 32 8
      ADSL2 framing
      MSGc: 1 1
      B: 98 25
      M: 2 8
      T: 1 1
      R: 16 16
      S: 2.1616 8.6153
      L: 792 208
      D: 64 8
      Counters
      SF: 1349665 1349663
      SFErr: 791 0
      RS: 22944310 11472135
      RSCorr: 116416 200
      RSUnCorr: 7257 0

      HEC: 676 0
      OCD: 19 0
      LCD: 0 0
      Total Cells: 74448552 0
      Data Cells: 23830365 0
      Drop Cells: 0
      Bit Errors: 0 0

      ES: 1620 0
      SES: 1353 0
      UAS: 164 0
      Total time = 18 hours 59 min 11 sec
      SF = 4006286
      CRC = 67068
      LOS = 25830
      LOF = 0
      ES = 1620
      Latest 1 day time = 18 hours 59 min 11 sec
      SF = 4006286
      CRC = 67068
      LOS = 25830
      LOF = 0
      ES = 1620
      Latest 15 minutes time = 14 min 11 sec
      SF = 50049
      CRC = 0
      LOS = 0
      LOF = 0
      ES = 0
      Previous 15 minutes time = 15 min 0 sec
      SF = 52989
      CRC = 0
      LOS = 0
      LOF = 0
      ES = 0
      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 = 52931
      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

     

     
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