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    Discrepancy -- which is real?

    This is a discussion on Discrepancy -- which is real? within the Sky Router forums, part of the Sky Broadband help category; Why do I get this result from Speed Test: And these figures from my Sagem router: DownStream Connection Speed 1984 ...

    1. #1
      RupertTHEbare's Avatar
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      Discrepancy -- which is real?

      Why do I get this result from Speed Test:



      And these figures from my Sagem router:

      DownStream Connection Speed 1984
      UpStream Connection Speed 448

      Why the difference?

      Remember you technical types, I am a bear of very little brain. Ooops, no, that's a different bear, not me.

      RTB.


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    3. #2
      PaulSky's Avatar
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      Re: Discrepancy -- which is real?

      Because the router s only reporting the maximum theoretical throughput that you can achieve on the line, your speed test is a snap shot of how fast you moved data from the test server to your PC at that moment in time.

    4. #3
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      Re: Discrepancy -- which is real?

      because the sagem will show your sync speed. This is not what you download at - this is the strength of the connection. With perfect conditions and no-one using the transit between you and the speedtest server (and no-one using the speed test server) this is the theoretical best.

      However we have to deal with contention and other people using transit/servers and suchlike.

      Dan

    5. #4
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      Re: Discrepancy -- which is real?

      i get varying results through the day today seems to be a good day for me i wouldn't worry too much about those results if your line is stable and functioning
      then good



    6. #5
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      Re: Discrepancy -- which is real?

      The speed your router is synced at is not the "theoretical best", "theoretical throughput" or the "strength of the connection". The speed your router reports is the actual maximum speed the router has negotiated with the exchange to transmit and receive at.

      Your throughput however can never be equal to that speed. That's because the communications protocol (TCP/IP) carries a fairly large overhead (approaching 20%) so, in a simple example, your router may receive 1000 bytes of data but only ~800 bytes of that are "real data". Think of it like sending a letter: the whole thing including envelope and stamp may weigh 100g but the letter inside only 80g. When it arrives, you throw away the envelope but without it the letter wouldn't have arrived.

      On top of that overhead you also need to consider the load on the speedtest server and the transmission method between the router and the receiving PC e.g. if you try a test with an overloaded server and use wireless to the PC then the difference between router sync and test result will be even bigger.

      Even if the server is OK and you're wired, if you have a poor line then data is likely to be corrupted and need retransmitting. That adds another overhead.

     

     

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