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Interpreting ADSL SNR and Attenuation Figures

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This article outlines what you can expect from SNR and Attenuation figures from ADSL modems. The tables below should be used to assist you in troubleshooting ADSL quality issues – even service drop-outs.

Attenuation is the loss of signal in a return trip between your ADSL modem and the exchange.

Attenuation Expectations
10 Extremely Good
20 Very Good
30 Good
40 Bad
50 Very Bad
60 Extremely Bad

The Signal to Noise ratio is a measurement of how much noise there is on the ADSL line.

SNR Result
6 Very bad
7 Bad
10 OK
20 Good
30 Very Good

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