What are good and bad SNR and Line Attenuation numbers?
- 6bB or below = Bad and will experience no line synchronization and frequent disconnections
- 7dB-10dB = Fair but does not leave much room for variances in conditions.
- 11dB-20dB = Good with little or no disconnection problems
- 20dB-28dB = Excellent
- 29dB or above = Outstanding
- 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
This information has been copied and reposted all over the internet. It seems to be pretty accurate, but I cannot independently vouch for it.