GOOD2USE Knowledge Network SNR

GOOD2USE Knowledge Network SNR

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The Signal-to-noise ratio (SNR) can be checked in the ADSL stats of a router. This number, as with attenuation, is expressed in dBs and describes the relation between signal strength and noise.If the noise is strong then the signal cannot be recognized. Higher ratios means better cables. At higher ratios, more speed can be achieved and lower ratios mean error-prone cable and lower speeds.

Whereas with attenuation low is good, the ratio of measured power (strength close to exchange) to reference power (strength at end-users site) is low, with SNR the higher the better. That is the signal outperforms the noise.

10dB and below is bad
11db - 20dB is OK
20dB - 28dB is excellent
29dB and above is outstanding

Some routers instead (or additionally) of the signal-to-noise ratio (SNR) figure display the signal-to-noise margin (SNR Margin) which is the difference between the actual SNR and the SNR required to sync at a specific "speed":

actual SNR = 44dB
SNR to sync at 8Mb = 35dB
SNR MARGIN = 44-35 = 9dB

A higher number is better and the numbers bellow 6dB may cause problems.

It is easier to understand if the line is at an acceptable SNR level, by using the margin figure, as there is no need to know the necessary SNR dB value, for the line to perform at a specific speed. The only requirement os to have a value at or above 6 dBs.

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