said by DeweyMan :
Thanks for the explanation for upload power. I would still like to know what the relationship is between uncorrectables and up/down speed. And why does a reboot of the modem make them disappear.
Uncorrectables are pieces of corrupt data the modem receives due to noise, interference, or a weak signal. It's like a number of errors. They disappear after a reboot because the modem doesn't permanently store that data in its memory. It basically resets its counters to zero.
Are these cumulative over time, which causes them to continually build up and never decrease? Is it possible that the modem justs gets to the point that it can't handle any more correctables and uncorrectables, and throughput slows down? The CableOne CSR I talked to pretty much ignored my asking about them.
An error count will never decrease except with a reboot; no copper internet connections are immune to an error or two, but your error rate shouldn't dramatically increase either. (1 error a day vs. 10,000 per day)
As the error rate increases, things start to slow down and in some cases, the modem may reboot itself or reinitialize the connection to straighten things out if it gets bad enough.
I'd like to know the rest of your modem stats, preferably a snapshot of everything that's going on (SNR, upstream/downstream power of each channel, unerrored, uncorrectable, & correctable codewords) It might further help us on what's going on.--