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    SNR and Speed, what to expect

    This is a discussion on SNR and Speed, what to expect within the Sky Broadband (Fibre) Help forums, part of the Sky Broadband help and support category; I have a quick question Would this speed/SNR be about right? It's lower than normal but I have just installed ...

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      marjohn56 is offline Sky User Member
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      SNR and Speed, what to expect

      I have a quick question

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      Would this speed/SNR be about right?

      It's lower than normal but I have just installed a new router and reckon it will take a few days to get back to my normal 61Mbs.

      What would the SNR need to be for 80Mbs?

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    3. #2
      seawright's Avatar
      seawright is offline Sky User Member
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      Re: SNR and Speed, what to expect

      There is no way of knowing. The figures you quote are only margins. The actual SNR will fluctuate. Having a margin of 6 dBs allows for these fluctuations in that noise could rise or signal lower by 6dBs before the noise exceeds the signal and the connection is lost. Stable lines can work with narrow margins but unstable lines require wide margins to ensure that the noise level never exceeds the signal. Increased speed requires more bandwidth and opening the bandwidth will admit more noise hence the relationship between speed and noise level.

      A better estimate of the speed a line can support is given by the Line Attenuation but it is not an exact science which is why a speed range is given by availability checkers.

      You should leave your router switched on and connected to allow the background DLM to optimise the connection for your new router but unlike DLM training the speed will only improve slowly over time provided your line quality allows this. I would allow two weeks to see if there is an improvement though achieving a final stable speed may take longer.



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