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Explained: SNR Margin and Loop Attenuation

I would like to share some information about SNR margin and Loop Attenuation values for your ADSL connection. These are very important to determine the performance of the Internet connection. I strongly suggest that you should use this information as guide only. These values may vary for different types of Internet connection such as ADSL, ADSL Max or Fibre connection.

SNR (Signal to Noise Ratio) margin measures strength of the DSL signal to Noise ratio. Most of the modem manufactures suggest 6dB is the lowest to able to make Internet connection. The higher the value of SNR margin, better the connection.

SNR Value (in dB)
Internet connection status
6 or less
Bad or may experience no sync or intermittent sync issue
7 – 10
Fair connection
11 – 20
Good connection with no sync issues
20 – 28
Excellent
29 or above
Outstanding

Loop Attenuation (Loop Att.) measures of how much the signal has degraded between the DSLAM and the modem. 60dB is the maximum signal loss recommended. So, if Loop Attenuation value is lower on your router, it is better for connection.

Loop Attenuation (in dB)
Internet connection performance
20 or less
Outstanding
20 – 30
Excellent
30 -40
Very good
40 – 50
Good
50 -60
Poor, may experience connectivity issues
60 or more
Bad, will experience connectivity issues

I hope you find it useful.

Disclaimer: www.TechieTalks.co.uk does not conceal the possibility of error and shortcomings due to human or technical factors. www.TechieTalks.co.uk does not bear responsibility upon any loss or damage arising from conduct or activities related to the use of data and information contained in this blog.

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