I have a 16Mb/s DSL link running at 8dB S/N ratio. It's generating 2-5 unrecoverable errors per minute.
More worryingly, I'm seeing periodic PPPoE dropouts, followed by periods of authentication failure lasting up to 2 minutes before the DSL box can reconnect.
In the last 2 days I've seen even worse failure - 10 minute of PPPoE reconnect timouts (Monday 8pm) and 45 minutes of the same (Wednesday 1:05am)
Pinging to my box is showing 75% packet loss on a near-idle DSL connection. If anyone else has set their DSL unit to be pingable I'd appreciate a couple more IPs to verify that what I'm seeing isn't unique to me. (I'm in the SE/Surrey - just outside the M25)