SNR Margin & Attenuation Rates for DSL

SNR Margin

In general, a higher signal to noise ratio will result in less errors.

  • 6bB. or below = Bad and will experience no line synchronisation or intermittent synchronisation problems.
  • 7dB-10dB. = Fair but does not leave much room for variances in conditions.
  • 11dB-20dB. = Good with little or no synchronisation problems
  • 20dB-28dB. = Excellent
  • 29dB. or above = Outstanding

Attenuation Rates

In general, attenuation is the loss of signal over distance. Unfortunately, dB loss is not just dependent on distance. It also depends on cable type and gauge (which can differ over the length of the cable), the number and location other connection points on the cable.

  • 20bB. and below = Outstanding
  • 20dB-30dB. = Excellent
  • 30dB-40dB. = Very Good
  • 40dB-50dB. = Good
  • 50dB-60dB. = Poor and may experience connectivity issues
  • 60dB. and above = Bad and will experience connectivity issues