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    Severe Decrease in Downstream Connection Speed

    This is a discussion on Severe Decrease in Downstream Connection Speed within the Sky Broadband help forums, part of the Sky Broadband help and support category; I have been with Sky Broadband since March 2007, all has performed well until this past week. - On the ...

    1. #1
      beetle_juice101's Avatar
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      Severe Decrease in Downstream Connection Speed

      I have been with Sky Broadband since March 2007, all has performed well until this past week. - On the Max package

      My usual downstream connection ranges within 4000kbps - 4800kbps however this past week I have been down to 1800kbps - 2300kbps.

      Using DSL ZoneUK and Samknows I should apparently be connected to my local exchange in Wallington:

      Samknows - LSWAL exchange

      1.77kilometres from me (as the crow flies).

      This problem is especially apparant in the late evening/night, the stats I show you now are from this morning, with the connection back up at the 4000kbps mark. However now knowing I am fairly close to my exchange I still feel this is a little low...

      Is it usual for connections to drop that severely in the evenings? Could Sky be capping me?

      Any help is appreciated, Cheers.

      Basic Stats:



      Detailed Stats:

      /usr/sbin/adslctl: ADSL driver and PHY status
      Status: Showtime Channel: INTR, Upstream rate = 768 Kbps, Downstream rate = 4064 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 13.0
      Attn(dB): 45.0 30.5
      Pwr(dBm): 19.8 11.6
      Max(Kbps): 4672 1120
      Rate (Kbps): 4064 768
      G.dmt framing
      K: 128(0) 25
      R: 16 16
      S: 1 8
      D: 64 8
      ADSL2 framing
      MSGc: 1 1
      B: 128 25
      M: 1 8
      T: 1 1
      R: 16 16
      S: 1.1240 8.6153
      L: 1032 208
      D: 64 8
      Counters
      SF: 12878 12876
      SFErr: 0 0
      RS: 875758 109446
      RSCorr: 14350 0
      RSUnCorr: 0 0

      HEC: 0 0
      OCD: 0 0
      LCD: 0 0
      Total Cells: 2103432 0
      Data Cells: 17660 0
      Drop Cells: 0
      Bit Errors: 0 0

      ES: 0 0
      SES: 0 0
      UAS: 61 0
      Total time = 4 min 57 sec
      SF = 12878
      CRC = 0
      LOS = 0
      LOF = 0
      ES = 0
      Latest 1 day time = 4 min 57 sec
      SF = 12878
      CRC = 0
      LOS = 0
      LOF = 0
      ES = 0
      Latest 15 minutes time = 4 min 57 sec
      SF = 12878
      CRC = 0
      LOS = 0
      LOF = 0
      ES = 0
      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


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    3. #2
      Synthetic's Avatar
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      Re: Severe Decrease in Downstream Connection Speed

      Your attenuation would suggest your line is about 3km (I think)from the exchange, hence you getting the speeds you are. Not sure about the alleged capping / disconnections, someone else will likely be able to shed some more light though

    4. #3
      IWasNotTheEnemy's Avatar
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      Re: Severe Decrease in Downstream Connection Speed

      doesnt look capped as the NM is around 7 - it'd be sky high if he'd been capped....

      also, line hasnt been up enuff to really give a good indication - give it a good work out and repost stats in a few hours time
      -------------------------------------------



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

    5. #4
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      Re: Severe Decrease in Downstream Connection Speed

      Do you think the downstream speed I am getting is fair considering my distance to my exchange? Is it possible I am not connected to the exchange I first thought? Can Sky tell me what exchange I am connected to?

      Again my downstream is now back to what I used to receive, however I expect it to drop back to the 2000kbps range in the evening.

      Here are my stats from today:

      Sorry for all the questions, appreciate any response.

      /usr/sbin/adslctl: ADSL driver and PHY status
      Status: Showtime Channel: INTR, Upstream rate = 768 Kbps, Downstream rate = 4320 Kbps
      Link Power State: L0
      Mode: G.DMT
      Channel: Interleave
      Trellis: ON
      Line Status: No Defect
      Training Status: Showtime
      Down Up
      SNR (dB): 7.3 14.0
      Attn(dB): 45.0 30.5
      Pwr(dBm): 19.8 12.5
      Max(Kbps): 4928 1088
      Rate (Kbps): 4320 768
      G.dmt framing
      K: 136(0) 25
      R: 16 16
      S: 1 8
      D: 64 8
      ADSL2 framing
      MSGc: 1 1
      B: 136 25
      M: 1 8
      T: 1 1
      R: 16 16
      S: 1.1167 8.6153
      L: 1096 208
      D: 64 8
      Counters
      SF: 145146 145144
      SFErr: 0 0
      RS: 9869932 1233724
      RSCorr: 5710 24
      RSUnCorr: 0 0

      HEC: 0 0
      OCD: 0 0
      LCD: 0 0
      Total Cells: 25146441 0
      Data Cells: 4976533 0
      Drop Cells: 0
      Bit Errors: 0 0

      ES: 7 0
      SES: 7 0
      UAS: 21 0
      Total time = 41 min 35 sec
      SF = 145146
      CRC = 0
      LOS = 8
      LOF = 0
      ES = 7
      Latest 1 day time = 41 min 35 sec
      SF = 145146
      CRC = 0
      LOS = 8
      LOF = 0
      ES = 7
      Latest 15 minutes time = 11 min 35 sec
      SF = 40875
      CRC = 0
      LOS = 2
      LOF = 0
      ES = 1
      Previous 15 minutes time = 15 min 0 sec
      SF = 52930
      CRC = 0
      LOS = 5
      LOF = 0
      ES = 5
      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 = 51341
      CRC = 0
      LOS = 1
      LOF = 0
      ES = 1

    6. #5
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      Re: Severe Decrease in Downstream Connection Speed

      Quote Originally Posted by beetle_juice101 View Post
      Do you think the downstream speed I am getting is fair considering my distance to my exchange?
      Your downstream sync is low for your attenuation. This is most likely down to a noisy line. Try your test socket.

      Quote Originally Posted by beetle_juice101 View Post
      Again my downstream is now back to what I used to receive, however I expect it to drop back to the 2000kbps range in the evening.
      It won't change unless you reboot or lose the connection. Sync is down to attenuation first then line condition (noise). Noise changes through the day. If you reboot the router when there is low noise (e.g. the morning) then it will sync higher than if you reboot when there is high noise (e.g. the evening). You may find the first sticky in my signature of help in understanding noise, attenuation etc.

     

     

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