leibold
Premium,MVM
join:2002-07-09
Sunnyvale, CA
clubs: 
| reply to jeffb666
Re: Tracking down problems.
A line attenuation of 55dB is on the high side and either indicates a long distance from the CO (which you can't do anything about, except moving) or a line problem. If the attenuation is noticeably lower when the modem is plugged directly into your NID test port than you need to fix your inside wiring.
Your down noise margin of 17dB is great, but the up noise margin of only 9dB is rather low (still ok, but not good).
The strange thing is that it is normally the other way around with the down noise margin being lower. This could be an indication that there is an RF disturbance effecting the upstream frequencies. Those are difficult to diagnose and depending on whether the disturbance is within your own home or somewhere along the line may not be fixable either.
You are already on an interleave profile which provides more reliability (at the expense of increased latency) and the fact that there are CRC errors justifies this (you would only want to be on fast-path if your line is completely error-free).
The error second counter should give the number of seconds that the connection was down because of errors (that could mean one downtime of 176 seconds or 176 times down for 1 second, but most likely something in between). An error log might hint at the cause, but often doesn't help much to pinpoint the exact source.
Using a ping plotter (or the DSLR/BBR line monitoring service) may help in determining whether there is a specific pattern (certain times of day) to the disturbances.
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