Often I am asked what the various modem log entries mean and generally speaking the logs contain more garbage than real data but there are couple of things I do look at when considering potential customer issues.
From time to time you may see Timeout or T3 and T4 errors.
T3 errors
can indicate a upstream problem
T4 errors
can indicate a downstream problem
The operative word in the above is
CAN. One off's or infrequent errors of this type are generally nothing to worry about. Frequent entries with some form of visible impact are worthy of me taking a look however.
I must caution you all
do NOT self diagnose and call CARE worried about an issue if you see these errors but experience no impact. Instead reach out to me and I'll take a look and we will take it from there and take any necessary corrective action.
So now you know