NOTICE: CM3000 cable modem v6.01.04 Firmware Released

Thanks- I appreciate the information.  This is a new construction house with all new coax including the run from the demarcation box outside the house to the Cox pedestal 30 feet away in the front yard. Terminations look good but I cannot inspect the run the guys came by and trenched in the yard a week ago (but there was no change in reliability from that work). I made sure there is only 1 coax connected at the demarc and it runs straight to the modem with no splitters, no amplifiers or even connectors. And that run from the demarc to the modem is about 20 feet in the crawl space (looks fine). 

I agree on power levels and I typically try to get +2 dBmV across the channels and hope for 44-ish dB SNR. This configuration is way off but still in the window for the CM3000.  I had Cox re-provision the modem this morning and so far it's holding the Internet but has lost the upstream OFDM lock as the modem status shows.

With Cox when you bring your own modem they simply look the other way and say you're on your own for tech support. Therefore they will not assist in analyzing the CM3000 error log even though it points to them for problems. They only care about getting a signal on the cable at the modem-- beyond that, they don't care and won't lift a finger to help. I do have some testers (Klein) to ring out the coax runs but I do not have a high frequency signal source or a scope to get a look at the frequency response. 

I've read about far too many issues with the CM3000 on Cox and that is why I plan to decommission it when the Arris arrives.