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    Download speed reduced by SKY in peculiar circumstances indeed!

    This is a discussion on Download speed reduced by SKY in peculiar circumstances indeed! within the Sky Broadband help forums, part of the Sky Broadband help and support category; Thanks but this is getting too technical for me know. Will try the simple rather than sophisticated Power Cycle and ...

    1. #11
      Longshanks's Avatar
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      Re: Download speed reduced by SKY in peculiar circumstances indeed!

      Thanks but this is getting too technical for me know.

      Will try the simple rather than sophisticated Power Cycle and see what happens.

      To reiterate:

      I didn't realise episodes/events where the modem has to be switched off would change the download sync speed. i.e. in my case dropping from 4480 to 4032Kbps. If many days of blood sweat and tears with tier 3 got me 4480 there must be potential to restore that-musn't there???

      Cheers

      L


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    3. #12
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      Re: Download speed reduced by SKY in peculiar circumstances indeed!

      Quote Originally Posted by blondejon View Post
      id give it about 5 minutes powered off. There is an old trick to use with DLM on BT lines which may help. The trick is to turn it off once a day for 3 days for about 5 minutes, this tricks DLM into running again.
      There are many myths on the net about BT DLM (keeping your router in the fridge will increase the line sync enough to jump to the next profile bracket, also heating your router is supposed to acheive the same thing) This is just one more.

    4. #13
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      Re: Download speed reduced by SKY in peculiar circumstances indeed!

      Quote Originally Posted by Longshanks View Post
      I didn't realise episodes/events where the modem has to be switched off would change the download sync speed.
      It's all to do with the relationship between noise margin and sync and the router being set to try and achieve a default downstream noise margin of 6.9db when negotiating with the exchange following a reboot. Therefore if the noise margin is below 6.9db on reboot then the sync will be lower than before the reboot; if higher then sync will be higher. All explained in simple terms in the first sticky in my signature.

      Yes, you can get your 4480 back if/when you reduce your line noise to that required to achieve that sync with your attenuation.

    5. #14
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      Re: Download speed reduced by SKY in peculiar circumstances indeed!

      Thanks

      Back up to 4480Mbps

      L

    6. #15
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      Re: Download speed reduced by SKY in peculiar circumstances indeed!

      blondejon is absolutely right. I'm a psycho about getting optimum speeds.
      -Danny Ross

    7. #16
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      Re: Download speed reduced by SKY in peculiar circumstances indeed!

      Sorry there is one thing that still confounds me (not difficult!):

      The Power Cycle initially produced the highest sync speed possible (as previously set by SKY) which was 4480Kbps. However, subsequent stats have varied from 4032 to 4288.

      What's strange is that the download sync never wavered once from 4480 when it was increased to that by SKY around March/April of this year. Yep the Noise Margin fluctuated as one would expect but never the download speed.

      Why would that element be changing now after a Power Cycle? Did they use some magic wand to maintain the max capacity speed which they set?

      Thanks

      L

    8. #17
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      Re: Download speed reduced by SKY in peculiar circumstances indeed!

      Quote Originally Posted by Longshanks View Post
      Why would that element be changing now after a Power Cycle? Did they use some magic wand to maintain the max capacity speed which they set?
      Quote Originally Posted by Saturday View Post
      All explained in simple terms in the first sticky in my signature.
      It really is

      If before you always connected at the max speed of the cap and don't now then your line condition has deteriorated.

    9. #18
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      Re: Download speed reduced by SKY in peculiar circumstances indeed!

      Thanks

      But all other things being equal:

      Same attenuation

      Same internal wiring (ADSL face pate and Pro Plus cable etc)

      What other facet of "line condition" are we talking about here apart from noise margin which never affected the constant sync speed before?

      Ta

      L

    10. #19
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      Re: Download speed reduced by SKY in peculiar circumstances indeed!

      You're confusing noise margin with line noise. The former is something the router sets, the latter is the inherent line condition.

      I don't know how to explain it any more clearly than I already have. Before, your line condition was sufficient to allow your sync to be at the level set by the cap i.e. it synced at 4480kbps with a noise margin of 6.9db or greater. Now your line condition has deteriorated so that to achieve the default of 6.9db the sync has to be lower. The router will always set the margin first (taking into account the current line condition/noise) and then set the sync.

      Got to ask - have you read he sticky?
      Last edited by Saturday; 27-09-08 at 10:28 PM.

    11. #20
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      Re: Download speed reduced by SKY in peculiar circumstances indeed!

      Hi

      I do understand the difference between N and NM. I spent ages combing thru the stickies when I had my probs a few months ago and reached the stage where I was almost reiterating the Noise Margin definition in my sleep. Difference between actual noise and noise router needs to..................... etc etc.

      To be precise I should have said noise in my last post.

      In these circumstances I just wonder how the "" line condition" also known as noise may have deteriorated.

      I guess there are a myriad of reasons.

      Thanks for your interest.

      L

     

     
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