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Forum Discussion
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.
I think this is an issue with xfinity and docsis 3.1 modems. I have tested two netgear cm1000 modems and an arris sb8200.. both of these are the top of the line docsis 3.1 modems and all 3 had identical issues at my house. The second I went out and got an arris sb6190 (one of the fastest docsis 3.0 modems) everything worked perfectly. It also worked perfectly with the rental modem which was also docsis 3.0. I think its fair to say this issue is isolated to docsis 3.1 modems.. atleast on my network.