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    Massive speed decrease

    This is a discussion on Massive speed decrease within the Sky Broadband help forums, part of the Sky Broadband help and support category; Well I'm not the first to have speed issues as I can see, however, I couldn't complain when I first ...

    1. #1
      Lemon_Jelly's Avatar
      Lemon_Jelly is offline Sky User Member
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      Wink Massive speed decrease

      Well I'm not the first to have speed issues as I can see, however, I couldn't complain when I first moved from BT over to Sky Broadband Max, my Speed was fantastic.

      I was getting over 1100kbs download speed when downloading large avi files (tv series), I was enjoying the large increase in speed over BT which I was getting around 700kbs. However, now after almost a month of a wonderful line my speed is awful. One morning I checked to see the files I had downloaded over night to find they were not there. Was a bit baffled at first as they were still downloading, I then noticed the speed. It had dropped down from 1100kbs to around 5100kbs. I sent an email after rebooting my computer and router had no increase in my line speed.
      Any how as I'm sure people with similar problems know you get some hints on why the line is slow etc etc. Once I had gone through all these tips nothing had changed so after a few more emails and phone calls to and from them, I'm still in the same situation although my line has now dropped to 3072 kbs. I was sent a new router as they assumed it was the main problem - nothing changed. Guess I'll put it on ebay....

      They say my line is capable of my original speed and they are unsure why it has dropped so they are testing the line for 5 days (thats tomorrow). I await some miraculous increase in speed on Wednesday.

      I have some line stats for you to look at in case some one here may have some more idea about the problems than the SKY Tier3 Techs.

      My exchange is about 2 hundred yards away - guess why I originally 'HAD' such a good speed.

      One of the first tests I took:

      /usr/sbin/adslctl: ADSL driver and PHY status
      Status: Showtime Channel: FAST, Upstream rate = 764 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): 10.3 13.5
      Attn(dB): 20.0 11.2
      Pwr(dBm): 921.6 12.4
      Max(Kbps): 17496 864
      Rate (Kbps): 15323 764
      G.dmt framing
      K: 239(0) 24
      R: 16 16
      S: 1 8
      D: 64 8
      ADSL2 framing
      MSGc: 59 68
      B: 238 23
      M: 1 8
      T: 2 1
      R: 16 16
      S: 0.4980 7.7037
      L: 4096 216
      D: 64 8
      Counters
      SF: 652755 652753
      SFErr: 835 1
      RS: 84858260 5548400
      RSCorr: 78493 0
      RSUnCorr: 10715 0

      HEC: 833 0
      OCD: 1 0
      LCD: 0 0
      Total Cells: 381849381 19002893
      Data Cells: 101904210 3599466
      Drop Cells: 0
      Bit Errors: 0 0

      ES: 65 1
      SES: 18 0
      UAS: 14 20
      Total time = 2 hours 56 min 25 sec
      SF = 652755
      CRC = 835
      LOS = 2
      LOF = 0
      ES = 65
      Latest 1 day time = 2 hours 56 min 25 sec
      SF = 652755
      CRC = 835
      LOS = 2
      LOF = 0
      ES = 65
      Latest 15 minutes time = 11 min 25 sec
      SF = 42372
      CRC = 5
      LOS = 0
      LOF = 0
      ES = 3
      Previous 15 minutes time = 15 min 0 sec
      SF = 55591
      CRC = 29
      LOS = 0
      LOF = 0
      ES = 6
      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 = 55590
      CRC = 19
      LOS = 1
      LOF = 0
      ES = 6
      15 minutes interval [-45 min to -30 min] time = 15 min 0 sec
      SF = 55591
      CRC = 87
      LOS = 0
      LOF = 0
      ES = 5
      15 minutes interval [-60 min to -45 min] time = 15 min 0 sec
      SF = 55652
      CRC = 48
      LOS = 0
      LOF = 0
      ES = 2



      Todays test:

      /usr/sbin/adslctl: ADSL driver and PHY status
      Status: Showtime Channel: INTR, Upstream rate = 512 Kbps, Downstream rate = 3072 Kbps
      Link Power State: L0
      Mode: G.DMT
      Channel: Interleave
      Trellis: ON
      Line Status: No Defect
      Training Status: Showtime
      Down Up
      SNR (dB): 8.3 12.0
      Attn(dB): 16.0 12.0
      Pwr(dBm): 19.8 12.5
      Max(Kbps): 3744 768
      Rate (Kbps): 3072 512
      G.dmt framing
      K: 97(0) 17
      R: 16 16
      S: 2 8
      D: 64 8
      ADSL2 framing
      MSGc: 1 1
      B: 93 19
      M: 2 8
      T: 1 1
      R: 16 16
      S: 2.1702 8.8000
      L: 752 160
      D: 64 8
      Counters
      SF: 11975038 11975036
      SFErr: 0 0
      RS: 407151308 101787806
      RSCorr: 50 122
      RSUnCorr: 0 0

      HEC: 0 0
      OCD: 0 0
      LCD: 0 0
      Total Cells: 1474963535 0
      Data Cells: 55474429 0
      Drop Cells: 0
      Bit Errors: 0 0

      ES: 4 0
      SES: 4 0
      UAS: 111 0
      Total time = 1 days 16 hours 12 min 11 sec
      SF = 13586524
      CRC = 580
      LOS = 4
      LOF = 0
      ES = 4
      Latest 1 day time = 16 hours 12 min 11 sec
      SF = 3431245
      CRC = 0
      LOS = 0
      LOF = 0
      ES = 0
      Latest 15 minutes time = 12 min 11 sec
      SF = 43050
      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 = 5082322
      CRC = 0
      LOS = 0
      LOF = 0
      ES = 0
      15 minutes interval [-30 min to -15 min] time = 15 min 0 sec
      SF = 52930
      CRC = 0
      LOS = 0
      LOF = 0
      ES = 0
      15 minutes interval [-45 min to -30 min] time = 15 min 0 sec
      SF = 52931
      CRC = 0
      LOS = 0
      LOF = 0
      ES = 0
      15 minutes interval [-60 min to -45 min] time = 15 min 0 sec
      SF = 52930
      CRC = 0
      LOS = 0
      LOF = 0
      ES = 0


      On looking at the new stats it seems that my ADSL2+ has changed to G.DMT - would this have such a drastic effect on my line speeds?

      Apologies for the overly long rant.

      LJ


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    3. #2
      Saturday's Avatar
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      Re: Massive speed decrease

      Your first set of stats were fine - good sync with a low attenuation, healthy noise margin but a surprisingly high number of errors.

      Your second set of stats are terrible - low sync for such a low attenuation (note it is 4db lower on G.DMT which is normal), noise margin in the normal range and not so many errors (probably due to being on G.DMT).

      You close your post with apologies for the rant, however, I think maybe it is Sky you should be apologising to. You've at the very least wasted their money on a new router.

      I may be wrong but your stats appear to show that your problem is with your line. That's either your problem (likely) if it is your internal wiring or BT's problem (less likely) if it is your BT line. You'll find plenty of info in the cabling and faceplate help forum on diagnosing and fixing line problems.

      The reason why I'm fairly confident that it is a line problem is simply that you are only slightly capped (as shown by your noise margin/max rate) and you have a poor sync. 99.9% of the time that's a clear indication of a line problem. With such a sudden and drastic change I'm guessing you've just made some changes to your wiring e.g. added an extension, removed a filter (or have a faulty one)?

      With your current line condition Sky are quite correct to move you to G.DMT. That is not the reason for your low sync speed.

    4. #3
      Lemon_Jelly's Avatar
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      Wink Re: Massive speed decrease

      Many thanks for the speedy reply - Saturday.

      I guess all I can say is that if the line was so good to start with why would it drop to this speed. I have made no change to wiring. I have no extension cables connected and my router is direct into the splitter. I don't have one of the face plates with a test socket that you can check unfortunately. It's still strange though how I could obtain such a good speed and then for it to drop overnight, since nothing my end has changed. I was getting twice my current speed with BT and had no problems. I will wait to see if I here back from the tier 3 team tomorrow.

      LJ

    5. #4
      machasm's Avatar
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      Re: Massive speed decrease

      Hi Lemon Jelly,
      I would like to concur with Saturday that the most likely culprit will be your internal wiring.
      Now just because things were good before doesn't mean that things must be good now!
      If you haven't made any changes to your internal wiring it might be that the ADSL filter has become faulty.
      Try swapping this.
      Also, if you can, try to disconnect any other internal wiring from your master socket and connect the router through an ADSL filter to it.
      Check your stats again then post the results again here.
      Mac.

    6. #5
      Saturday's Avatar
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      Re: Massive speed decrease

      Quote Originally Posted by Lemon_Jelly View Post
      and my router is direct into the splitter.
      Splitter? If you mean a line splitter then they tend to be really cheap rubbish - or do you mean a microfilter?

      If you don't have a test socket then try a minimal connection as suggested by machasm i.e. microfiter into master socket, router into microfilter. Nothing else connected. No phone, splitter, digibox etc. Then try another filter. Any change to your stats?

    7. #6
      Lemon_Jelly's Avatar
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      Re: Massive speed decrease

      Ok! many thanks for all input - I'll be trying out your thoughts in the morning and will post new stats as soon as possible.

      Cheers

      LJ

    8. #7
      Lemon_Jelly's Avatar
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      Wink Re: Massive speed decrease

      Hi there again,

      Well I tried using a brand new filter on my line removed the phone cable from it also and just tried it with my broadband connected. My results are the same. I am unable to post full stats as the mognuts utility page seems to be down at the moment, so here are the ones from the internal software.

      System Up Time 00:42:15
      Port Status TxPkts RxPkts Collisions Tx B/s Rx B/s Up Time
      WAN PPPoA 29505 53314 0 622 31348 00:40:47
      LAN 10M/100M 54127 30392 0 30793 918 00:42:13
      WLAN 11M/54M 148 0 0 15 0 00:42:03

      ADSL Link Downstream Upstream
      Connection Speed 3072 kbps 512 kbps
      Line Attenuation 16.0 db 12.0 db
      Noise Margin 8.3 db 12.0 db


      Theres nothing else I can change as I have no extensions to remove. I guess I will have to mail them this evening. I don't have a socket that has a test socket to try out unfortunately either.

      Thanks in advance for giving me some hints on what the problem could be.

      Kind regards

      LJ

    9. #8
      Lemon_Jelly's Avatar
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      Angry Re: Massive speed decrease

      Well after almost a month of speeds getting lower they have now hit an all time low. It's so bad now that when I try and download an avi file I am unable to browse - google is taking a minute to appear.

      Tier 3 never seem to know whats wrong and they never seem to have a record of my faults or ticket numbers I have been given. It is getting beyond a joke now.

      Here are my stats from this evening - any help would be grateful.

      /usr/sbin/adslctl: ADSL driver and PHY status
      Status: Showtime Channel: INTR, Upstream rate = 416 Kbps, Downstream rate = 2240 Kbps
      Link Power State: L0
      Mode: G.DMT
      Channel: Interleave
      Trellis: ON
      Line Status: No Defect
      Training Status: Showtime
      Down Up
      SNR (dB): 11.5 14.0
      Attn(dB): 16.0 12.0
      Pwr(dBm): 19.8 10.4
      Max(Kbps): 3776 768
      Rate (Kbps): 2240 416
      G.dmt framing
      K: 71(0) 14
      R: 16 16
      S: 2 16
      D: 64 8
      ADSL2 framing
      MSGc: 1 1
      B: 71 14
      M: 2 16
      T: 1 1
      R: 16 16
      S: 2.2222 17.0666
      L: 576 120
      D: 64 8
      Counters
      SF: 22065578 22065576
      SFErr: 0 0
      RS: 750229684 93778698
      RSCorr: 4 406
      RSUnCorr: 0 0

      HEC: 0 0
      OCD: 0 0
      LCD: 0 0
      Total Cells: 1981737890 0
      Data Cells: 118314576 0
      Drop Cells: 0
      Bit Errors: 0 0

      ES: 0 0
      SES: 0 0
      UAS: 21 0
      Total time = 1 days 8 hours 12 min 23 sec
      SF = 22065578
      CRC = 0
      LOS = 0
      LOF = 0
      ES = 0
      Latest 1 day time = 8 hours 12 min 23 sec
      SF = 1737882
      CRC = 0
      LOS = 0
      LOF = 0
      ES = 0
      Latest 15 minutes time = 12 min 23 sec
      SF = 43756
      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 = 24 hours 0 sec
      SF = 5082322
      CRC = 0
      LOS = 0
      LOF = 0
      ES = 0
      15 minutes interval [-30 min to -15 min] time = 15 min 0 sec
      SF = 52930
      CRC = 0
      LOS = 0
      LOF = 0
      ES = 0
      15 minutes interval [-45 min to -30 min] time = 15 min 0 sec
      SF = 52931
      CRC = 0
      LOS = 0
      LOF = 0
      ES = 0
      15 minutes interval [-60 min to -45 min] time = 15 min 0 sec
      SF = 52930
      CRC = 0
      LOS = 0
      LOF = 0
      ES = 0

    10. #9
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      Re: Massive speed decrease

      Quote Originally Posted by Lemon_Jelly View Post
      It's so bad now that when I try and download an avi file I am unable to browse - google is taking a minute to appear.
      Is that via P2P? It sounds like you are maxing out your upstream connection which will make browsing very slow, Adjust your P2P upstream allocation.

      Looking at your stats you are capped but not by much (and your upstream for some reason). You clearly have a major line noise problem as with your enviably low attenuation you should have a blisteringly fast connection.

      Remember that your line stretches from (and including) the router/router cable, home phone wiring, BT line and exchange equipment. Sky only have responsibility for the first and last - it's your responsibility to resolve any problem with the middle two.

     

     

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