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Solved
CM1000 Xfinity issues
I am quite frustrated at this point. I had a CM600 modem to support Comcast's Extreme 150 service. I've had it for a few years and was consistently getting 160 to 170mbps speed from it. About thre...
Well it is finally fixed. The tech showed up today and I showed him the two frequencies that were having the problem. He checked outside, and then at the tap. He came into the house and said he needed to call a bucket truck in to fix it. I got a recorded call from Comcast that they were working to fix the issue. I got a second call an hour later that the issue was fixed. I ran a speed test and got a consistent 160mbps (yay!). I used the reset button on the modem and let it re-provision. All the signal/noise and power levels were good and there were no uncorrectable codewords. They didn't tell me what they fixed, but at long last, it is fixed.
My log now has bursts of errors. It may be a 1 or 2 or 3 hour time frame that peppers my Cm1000 error logs, then it clears up. After calling Comcast several times I am convinced the customer service reps are starting to hear more and more of CM1000 issues when using D3.1 Mine modem was just fine on the 24x3 D3.0 but went haywire when the firmware was updated and a D3.1 D/S channel was deployed in my area.
I am on a Cisco CMTS judging by my CMTS MAC and I think that is where the problem lies. Comcast had a similar problem whith the Motorola SurfBoard 8200 activating on Gigabit Tier. The problem was the CMTS and a Comcast Engineer had to log into the CMTS and manually activate the 8200's. That issue has largely been resolved but that is what leads me to believe this also is a CMTS issue. Still no resolution, however.