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Forum Discussion
CM1200 useless on Charter/Spectrum after they enabled OFDMA on upstream channels
Purchased a CM1200 modem a few months back to use with my spectrum service. Has been working fine for the last 3 months with OFDM on the downstream channels and regular upstream bonded channels. Ab...
pls DM me
Any motion with this and Spectrum? I'll also DM you just in case there's something I can do or test... because this just recently started happening to me as well. Endless T3 and T4 timeouts, causing eventual connection instability/intermittency.
Please post a copy and paste of the modems connection status page.
Have the ISP check the signal and line quality UP to the modem. Be sure the ISP provisions the modem correctly.
Be sure there are no coax cable line splitters in the between the modem and ISP service box.
Be sure your using good quality RG6 coax cable up to the modem.
https://community.netgear.com/t5/Cable-Modems-Routers/General-info-and-Troubleshooting-for-Cable-Modems/m-p/1530376#M12853
Draco wrote:Any motion with this and Spectrum? I'll also DM you just in case there's something I can do or test... because this just recently started happening to me as well. Endless T3 and T4 timeouts, causing eventual connection instability/intermittency.
I have two contacts at netgear who worked on my behalf to get my own modem upgraded to firmware version 3.02.01. Charter should be making 3.02.01 the new default version for anyone using a CM1200. They are dragging their feet and not responding to my repeated emails. It is very frustrating. I have threatened another FCC/BBB complaint as others are now reaching out as they enable OFDMA in more markets across the country.
Interesting. Well here's hoping I can eventually get that done. This a user-initiated thing or something done on Spectrum's end?
Hardware Version 1.01 Firmware Version V1.02.01
