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Forum Discussion
CM1000 Unstable Downstream
I recently upgraded my Xfinity to 600 Mbps, since they said Gig Speed would require technicians to come out. Since my old modem was only DOCSIS 3 I picked up the CM1000. After activation everything seemed fine, I was pulling between 600-800 Mbps, but eventually my downstream would basically die. I was still connected, and certain things worked fine, but my speed would be 2 Mbps or something and very unstable. However my upstream was still close to 30 Mbps. This issue happens from time to time and I suspect my lines just can't handle this high of speed since I have a hard time believing the modem is bad. I was on a splitter, but removed that and put modem directly to wall, it seemed like it helped, but the issue came back. Here are my connection details, my concern is the uncorrectable errors I'm seeing and the OFDM SNR, but I don't know a lot about this.
I likely plan to drop my Xfinity speed to what it was and return the modem, unless something can be done without a technician coming out. I live in an apartment building and don't plan to stay much longer so it's not worth effort and potential cost to fix.
Thank you for any help you can provide.
3 Replies
it shouldn't cost anything to fix. Comcast is required to provide you a good signal entering your home. They do charge you if the problem is internal to your home. But you're directly connected to the line coming into the house/apartment. So it should be external to that. I'd make them check/fix it as your power levels are off and you've got issues with the line.
So don't just do it for you, do it for the next renter :)
Initial Xfinity support chat went about as well as expected, they couldn't detect any issues with the line from their end. They suggested connecting my PC directly to the modem and trying a different ethernet cord. Should I be more direct and point out the issues shown in modem diagnostics?
What I'd do:
1. directly connect modem to line coming in. Make sure there isn't any splitters or anything else attached.
2. Directly connect the pc to the modem.
If issue is still going on or your line connection still looks like your prior post, its either the modem or the line. They might try to say its the modem as that's their go-to response with 3rd party modems. Push the issue stating that their power levels are off and there's to many errors/problems on the modem connections screen.
