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Forum Discussion
CM1200 Modem Upstream LED Flashing - Spectrum Internet
I've had this modem for just over a year and it started dropping signal a couple days ago. The upstream LED was flashing green so I had a tech from Spectrum come out and check on everything. They pro...
Thanks for that. They said the power seems fine (I just asked again). Is there anything I can do on the modem side to rule out it is not faulty? I want to be able to bring some ammo back to Spectrum so they can't punt it back. As of now their provided modem is working, so I don't have a lot of leverage.
You're actually the first person with a locked upstream on the ofdma channels I've seen.
You're power levels are technically within spec. You didn't post your whole logs but the one had a dynamic window violation and t3 errors. Dynamic window violations usually occur when the power gets to high/low for a period of time. it can cause instabilities.
Your power levels are also a little backwards. Usually when you're power level on the upstream is high, it means you're close to the node so you tend to have a lower upstream level because it doesn't take as much power to communicate with the node.
Is there an amplifier in the line?
Also, have you tried checking off the "enable extended upstream transmit power"
The "power" box is right outside the window from the modem, so the cable run is pretty short. I'm not sure if there is amp or not though. I will try giving the checkbox a try.
Thank you!
- You are the victim of OFDMA being enabled on the upload channels. Modem running 1.02.01 breaks when OFDMA is enabled. You can read my journey here. https://www.dslreports.com/forum/r32832397-Netgear-CM1200-is-now-crap-OFDMA-just-enabled-on-upstream
I read through your post, and one year later seems like the same issue is happening. Is the only recourse to buy another modem?!!? This one is slightly over a year old only just started having issues. Still running the same firmware too. Like OP I've had 3 tech visits, swapped out lines, added/removed/added again amplifier. But constant issues. ISP said maybe an issues with a Node, but to be honest I don't know what that means. I was given the number to the supervisor directly for updates, but I'll let you guess how many times I've spoken to him.
I'll take any/all suggestions, tips, magic enchament spells.. what ever you got.
Any progress on this?
WaveWarper wrote:The "power" box is right outside the window from the modem, so the cable run is pretty short. I'm not sure if there is amp or not though. I will try giving the checkbox a try.
Thank you!
They came out and swapped my modem with theirs (which is free) and my speeds have been the same. I've honestly not put any more effort into it. Kind of a shame because this means NETGEAR is losing a customer and I probably wouldn't recommend someone get their own modem at this point.
