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uk.telecom.broadband (UK broadband) (uk.telecom.broadband) Discussion of broadband services, technology and equipment as provided in the UK. Discussions of specific services based on ADSL, cable modems or other broadband technology are also on-topic. Advertising is not allowed.

Quick question - Noise margin and SNR



 
 
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  #1  
Old March 23rd 06, 10:53 PM posted to uk.telecom.broadband
Daniel
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Posts: 70
Default Quick question - Noise margin and SNR

Possibly a stupid question Do noise margin and SNR mean exactly the same
thing? And if so are there any other words which mean the same thing I
should know of?

Thanks

Dan


  #2  
Old March 24th 06, 09:34 AM posted to uk.telecom.broadband
[email protected]
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Posts: 529
Default Quick question - Noise margin and SNR


On 23-Mar-2006, "Daniel" wrote:

Possibly a stupid question Do noise margin and SNR mean exactly the same
thing? And if so are there any other words which mean the same thing I
should know of?


AFAIK - You can measure noise in the absense of a
signal, and you can measure the signal, thus determine
the SNR. SNR is a measurable quantity.

OTOH Noise margin as generally used means how
much the signal has to be greater than the noise
for a system to work, or acceptably work.
So, for instance, for satellite television, a better
LNB by contributing less noise, will give a
less picture noise, as will a better receiver front
end if it contributes less noise than a competitors
product. The noise margin is therefore subjective,
what you are prepared to accept, and equipment
subject, how good the equipment copes with a
not perfect signal. So noise margin has to be
qualified it is not a simple measureable ratio.

So no, they are not EXACTLY the same.
  #3  
Old March 25th 06, 10:30 AM posted to uk.telecom.broadband
P H
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Posts: 26
Default Quick question - Noise margin and SNR

See: http://en.wikipedia.org/wiki/Signal-to-noise_ratio

73's de Phill H.


 




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