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    New to Sky. What has triggered this sync speed capping?

    This is a discussion on New to Sky. What has triggered this sync speed capping? within the Sky Broadband help forums, part of the Sky Broadband help and support category; I am new to Sky. I have a lot of experience of helping friends with BT IPstream connections, but very ...

    1. #1
      crazy1's Avatar
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      New to Sky. What has triggered this sync speed capping?

      I am new to Sky. I have a lot of experience of helping friends with BT IPstream connections, but very little with Sky LLU. The friends I have put on Sky have just been plug and go, just changing their wireless settings for something more secure than an 8 alphanumeric character WPA-PSK passphrase.

      My own experience so far
      Sky Netgear DG934G supplied with
      Firmware Version V2.02.34
      Within a few minutes of connection to Sky it auto-upgraded itself and rebooted with
      Firmware Version V2.02.44

      On the subject of connection speed, my experiences over the first 24 hours were as expected for the line, however after this it looks as if my speed was capped at 4091-4094. The SNR now rises to whatever level it wants to on connection (as high as 15dB), but the sync speed is constant. It looks too consistent for coincidence.

      I have spent hours reading this forum, the information is really useful, but I canít find anyone with experiences to match mine.

      Did using my DG834N screw things or is this sync speed capping standard?

      As I am too far from the exchange for the up to 16Mb that some lucky ones get, I would rather not lose the option of the additional 1Mb in the mornings.

      I used my DG834N as I need the 802.11n for coverage and want WPA2-PSK for security. If necessary I will configure it to just be a wireless access point and use the SKY supplied DG934G to connect to Sky

      In my welcome letter I see no mention of DLM or several days while the line settles.

      For the record the router is plugged into the master socket and there are no extensions.

      1st connected evening of 16th December 2008
      Connection Speed 4352 kbps 416 kbps
      Line Attenuation 45 db 27 db
      Noise Margin 5 db 13 db

      17th December 2008 08:30
      Connection Speed 5152 kbps 416 kbps
      Line Attenuation 45 db 27 db
      Noise Margin 3 db 13 db

      18th Dec 2008 20:00
      Connection Speed 4092 kbps 412 kbps
      Line Attenuation 45 db 27 db
      Noise Margin 2-4db 2147483647db

      18th Dec 2008 20:10 with own Netgear DG834N
      Speed 4094 kbps 409 kbps
      Line Attenuation 49.0 db 28.0 db
      Noise Margin 7.5 db 24.0 db

      08:00 18th Dec 2008 Netgear with own DG834N
      Connection Speed 3875 kbps 412 kbps slower than expected
      Line Attenuation 49.5 db 28.1 db
      Noise Margin 7.1 db 23.5 db

      11:50 19th Dec 2008 with sky supplied router DG934G
      Connection Speed 4091 kbps 412 kbps
      Line Attenuation 45 db 27 db
      Noise Margin 15 db 25 db

      12:34 20th Dec 2008 with supplied Sky router DG934G
      Connection Speed 4091 kbps 412 kbps
      Line Attenuation 45 db 27 db
      Noise Margin 14 db 25 db

      12:39 20th Dec 2008 Rebooted and it got
      Connection Speed 4091 kbps 412 kbps
      Line Attenuation 46 db 27 db
      Noise Margin 12 db 2147483647 db

      09:30 21st Dec 2008
      Connection Speed 4091 kbps 412 kbps
      Line Attenuation 45 db 27 db
      Noise Margin 14 db 2147483647 db

      20:51 21st Dec 2008
      Connection Speed 4091 kbps 412 kbps
      Line Attenuation 45 db 27 db
      Noise Margin 9 db 25 db
      Connection Time 11:37:46

      00:15 22nd Dec 2008
      Connection Speed 4091 kbps 412 kbps
      Line Attenuation 45 db 27 db
      Noise Margin 7 db 25 db

      10:00 22nd Dec 2008
      Connection Speed 4091 kbps 412 kbps
      Line Attenuation 45 db 27 db
      Noise Margin 11 db 25 db
      Connection Time 02:08:55

      15:00 24th Dec 2008-12-24
      Connection Speed 4091 kbps 412 kbps
      Line Attenuation 45 db 27 db
      Noise Margin 11 db 25 db


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    3. #2
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      Re: New to Sky. What has triggered this sync speed capping?

      Its probably DLM and you have not been notified. afaik This is implemneted for all new customers, and normally it is a good thing.

      With an attenuation of 45 you should theoretically get better speeds than mine, and I get just under 7mb with an attenuation of 46/47

      The attenuation is nothing you can sort out, as that is the distance from the exchange, but you should really be seeing better than 4mb

      Try the test socket within the master socket and see if the speed improves?

      Sky User - The unofficial support forum for everything Sky! How to test your Master Socket

      But it is possibly DLM or capped - holding you back.

      What Is DLM? Everything you need to know.
      Last edited by NewsreadeR; 24-12-08 at 05:43 PM.




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      Re: New to Sky. What has triggered this sync speed capping?

      Thanks for your answer NewsreadeR

      Plugging into test socket, with/without phone in filter and replacing filter with ADSLNation filter made no difference. Sync each time 4091 and SNR varied within same limits. Not a lot else I can do there without changing router as the BT line to house is only a year old and the master socket is only about three years old.

      To be honest I was not expecting greater than the 5.3Mb sync in morning and 4Mb ish at night, but am disappointed that after the first 24 hurs the sync speed has been constant at the lower speed. Every other ADSL I have seen syncs higher in the morning and drops lower at night. Other items I have seen on this forum suggest Sky Mid LLU would be the same depending on when you connect.

      Really trying to understand Sky LLU sync pattern. BT IPstream connection was predictably higher in morning (but unfortunately no extra download speed available due to BT 3 day lowest speed BRAS algorithm choosing nearest 0.5Mb less than slowest sync speed over the 3 days)

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      Re: New to Sky. What has triggered this sync speed capping?

      i can confirm DLM as well because your upload is 412kbps

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      Re: New to Sky. What has triggered this sync speed capping?

      All you can do is phone Sky and ask them to configure your line manually. They may tell you you have to wait until DLM has finished, if so, there is not much you can do except wait.

      In saying that, your stats on 22/12 show your noise margin very close to the default, so it is possible some interference is effecting your line in the late evening, causing DLM to see this as your maximum stable speed. It could very well be connected to some festive lights or display near your phone line. This is the worst time of year, with xmas lights and dark nights, for broadband. If you can stick with it a couple of weeks, you might find there is a big improvement.

      Edit - I meant to say, I don't think using your own router will have made any difference, but you would be better sticking to the Sky one till your connection is sorted out.

      TomD


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    7. #6
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      Re: New to Sky. What has triggered this sync speed capping?

      Thanks, OK I will wait a while before contacting Sky and will not put my non-Sky router back on the line until there are no outstanding issues.

     

     

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