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Thread: difference between SNR and SNR margin?

  1. 02-01-09, 01:49 AM #1
    Gary4gar
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    Question difference between SNR and SNR margin?

    What is the difference between SNR and SNR margin?

    some routers reports SNR margin and some SNR.
    are they both same thing or different things?
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  2. 02-01-09, 07:29 AM #2
    cool_techie_tvm
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    Quote Originally Posted by Gary4gar View Post
    What is the difference between SNR and SNR margin?

    some routers reports SNR margin and some SNR.
    are they both same thing or different things?
    SNR margin is the SNR above the minimum SNR needed to sustain a certain speed. If it takes 20dB to connect at a given speed, and the actual SNR is 26dB, you will have an SNR margin of 6dB.

    A SNR Margin of more than 13dB is considered excellent.

    Also a downstream attenuation of 34dB means that u are about 2.46 kms away from the DSLAM.

    vinuthomas.com >> Discussion Forum >> BSNL Dataone >> BSNL Dataone >> What should be optimum SNR and Attenuation.

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  3. 02-01-09, 04:36 PM #3
    Gary4gar
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    what is the minimum SNR needed?
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  4. 02-01-09, 06:36 PM #4
    cool_techie_tvm
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    Quote Originally Posted by Gary4gar View Post
    what is the minimum SNR needed?
    Its 6dB
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  5. 02-01-09, 10:05 PM #5
    just4kix
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    Modems always mention SNR Margin. SNR Margin is always confused with real SNR.

    Please read this also: SNR Margin and Line Attenuation - What do they mean?
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  6. 02-01-09, 10:15 PM #6
    cool_techie_tvm
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    Quote Originally Posted by just4kix View Post
    Modems always mention SNR Margin. SNR Margin is always confused with real SNR.

    Please read this also: SNR Margin and Line Attenuation - What do they mean?
    Excellent article. Thanks for the link
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  7. 02-01-09, 10:42 PM #7
    Gary4gar
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    @just4kix
    Thanks a lot, all confusion cleared!
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