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    Help regarding my Upload speed

    This is a discussion on Help regarding my Upload speed within the Sky Broadband help forums, part of the Sky Broadband help and support category; I've often noticed that upstream will reach a little higher when downstream is capped slightly. I guess it's just the ...

    1. #11
      buddbuttocks's Avatar
      buddbuttocks is offline Sky User Member
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      Re: Help regarding my Upload speed

      I've often noticed that upstream will reach a little higher when downstream is capped slightly. I guess it's just the way the equipment works.

      When I was on BB Unlimited I had my line completely uncapped and was getting about 13 meg down and 900k up, SNR mostly stayed at 6db down and 8db up. When the downstream was capped to 11 or 12 meg the upstream went up to about 1 meg. I didn't think it was worth the tradeoff.


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    3. #12
      Scubbie's Avatar
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      Re: Help regarding my Upload speed

      Quote Originally Posted by buddbuttocks View Post
      I've often noticed that upstream will reach a little higher when downstream is capped slightly. I guess it's just the way the equipment works.

      When I was on BB Unlimited I had my line completely uncapped and was getting about 13 meg down and 900k up, SNR mostly stayed at 6db down and 8db up. When the downstream was capped to 11 or 12 meg the upstream went up to about 1 meg. I didn't think it was worth the tradeoff.
      This is how ADSL works.

      With a previous ISP I had both Annex A (which is what Sky use) and Annex M.

      With Annex A I had:

      17.1 d/l
      1.3 u/l

      With Annex M I had:

      15.4 d/l
      2.3 u/l

      There were no other line changes involved, although a device in the exchange needed to be swapped for a different one when I was placed on Annex M.

      Upstream & Downstream both share the same copper wires and need to share the frequency range.

      Think of it like a 100 lane road. Lanes 1-90 are used for downstream, whilst 91-100 are for upstream. With Annex M, 1-80 are downstream, 81-100 for upstream.

      Sky Fibre Unlimited Pro: Connected at 80,000 kbps / 20,000 kbps
      Previous ADSL2+ Speed 19999 kbps 1153 kbps, Line Attenuation 17.5 db 6.9 db, Noise Margin 7.5 dB 8.7 dB
      Speedtest: 17.15MB/s 0.97Mb/s Ping 31 ms

    4. #13
      Shonk's Avatar
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      Re: Help regarding my Upload speed

      Capping the downstream doesnt affect my line

      I can sync at 4meg down and i still only get 1142 up at 9.5db target

      though i would ofc get more on annex m
      due to it using more of the spectrum

     

     
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