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    very poor connection up 2 mbytes

    This is a discussion on very poor connection up 2 mbytes within the Speed tests and how to get better results forums, part of the Sky Broadband help and support category; Originally Posted by reddwarfcrew The 15.5 figures is a bug. the 60 figure is the true figure. I just reset ...

    1. #21
      myoracledba's Avatar
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      Quote Originally Posted by reddwarfcrew View Post
      The 15.5 figures is a bug. the 60 figure is the true figure.
      I just reset my moden and now I am getting Line Attenuation 15.5 db for downstream
      ..
      Go Figure ....


      System Up Time 00:03:29
      Port Status TxPkts RxPkts Collisions Tx B/s Rx B/s Up Time
      WAN PPPoA 8 8 0 2 4 00:02:00
      LAN 10M/100M 213 0 0 359 0 00:03:26
      WLAN 11M/54M 528 835 0 921 302 00:03:16


      ADSL Link Downstream Upstream
      Connection Speed 2688 kbps 768 kbps
      Line Attenuation 15.5 db 31.5 db
      Noise Margin 6.8 db 12.0 db


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    3. #22
      reddwarfcrew's Avatar
      reddwarfcrew is offline Sky User Moderator
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      as i say the router has a bug where it sometimes incorrectly shows the attenuation as 15.5.

    4. #23
      myoracledba's Avatar
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      Quote Originally Posted by reddwarfcrew View Post
      think of it anotherway.

      You have a clock and your house is at 12oclock and your exchange is at 9pm.

      You could get to your exchange my taking 3 steps (ie 12 to 11 to 10 etc) or you could take 9 steps (ie 1, 2, 3 etc).

      Unless you know which way BT have gone you can't judge your distance from the exchange by postcode to postcode.
      Fair Enough ..I agree with you ...

      But how do you explain line drop out due to massive fluctuations in attenuation.

      The attenuation should remain constant all the time .

      Update ..
      Oh ok .....This is a bug ...
      Thanks



      System Up Time 00:06:48

      Port Status TxPkts RxPkts Collisions Tx B/s Rx B/s Up Time
      WAN PPPoA 335 403 0 242 562 00:05:20
      LAN 10M/100M 294 0 0 252 0 00:06:46
      WLAN 11M/54M 957 1793 0 1056 416 00:06:36


      ADSL Link Downstream Upstream
      Connection Speed 2464 kbps 768 kbps
      Line Attenuation 15.5 db 31.5 db
      Noise Margin 8.1 db 12.0 db


      I did find this nice link below to explain Line Attenuation vs Speed, it is not clear to me 2Meg Service Bits or Bytes ..

      http://usertools.f9.net.uk/tutorials/id/12
      To get a reliable service your line needs to meet the following criteria:

      512K Service. There is now no upper limit and BT will attempt than make it work on any line if possible.
      1 Meg Services. You t need a line loss of less than 60 dB, and so, typically, will be no more than 6.0 kilometres from the exchange.
      2 Meg Service. You need a line loss of less than 45 dB which means you will be 3.5 Kilometres or less from the exchange.



      Less than 1km should be 23-24 Mbit

      1.0km = 13.81db = 23Mbit
      1.5km = 20.7db = 21Mbit
      2.0km = 27.6db = 18Mbit
      2.5km = 34.5db = 13Mbit
      3.0km = 41.4db = 8Mbit
      3.5km = 48.3db = 6Mbit
      4.0km = 56db = 4Mbit
      4.5km = 62.1db = 3Mbit
      5.0km = 69db = 2Mbit


      Attenuation vs distance vs Speed Connection :

      A Microsoft Excel document containing a calculator to obtain these figures can be downloaded
      http://users.on.net/richard.moulynox...lculatorv1.xls


      my Downstream attenuation (dB) 60.00

      Enter your Downstream attenuation (dB) 60.00
      Attainable Rate (ADSL1) - kb/s 2566
      Attainable Rate (ADSL2+) - kb/s 2682
      Distance to the exchange (metres) 4345
      Cable Loss (dB/km) - Default = 13.81 13.81
      Last edited by myoracledba; 03-12-06 at 10:02 PM.

    5. #24
      reddwarfcrew's Avatar
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      see my post above.

     

     
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