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Forum Discussion
CM600 Modem all of a sudden stopped working...
I have had a CM600 cable modem with a tp link ac1200 router for over 4 years, working great. I used to have Suddenlink, but Optimum bought them out, so that's who the service is through. About 1.5 yea...
Power levels and correct and un-correctables are good.
However lots of criticals in the event logs. Any Criticals, Errors or Warnings seen in the event logs needs to be reviewed and resolved by the ISP. Indicates a signal issue on the ISP line up to the modem.
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.
Start with removing any amplifiers, signal attenuators, or splitters from the coax.
From there check the line for kinks, damage, moisture in the line.
Check the connectors for improperly made ends, foil touching the copper coax line, loose connections, bad/old/cheap connectors, or corroded connections. Replace them if you do.
Be sure to power OFF the modem for 1 minute then back ON.
https://community.netgear.com/t5/Cable-Modems-Routers/General-info-and-Troubleshooting-for-Cable-Modems/m-p/1530376#M12853
https://kb.netgear.com/24311/Power-level-guidelines-for-a-NETGEAR-cable-modem-router
https://www.duckware.com/tech/solving-intermittent-cable-modem-issues.html
https://highspeed.tips/docsis-events/
I just bought a used NG CM1200 cable modem off shopgoodwill for $40.
- Ok thanks. The coax cable is the one installed by the ISP originally (both were made by them) & seem perfect (no bends,,rust, or anything other than looking exactly like they have for the last several years,, when they've worked properly). There are no splitters & the cable is less than 2 feet long,, coming directly from the wall in my apartment going into the modem. There are none of the things you mentioned to check for.. It's the exact same cables, connectors,,etc that have been working fine for over 4 years without any changes, so it's odd that it would be any of the associated cables or accessories (nothing touches them, as i live alone, & they're out in the open on a stand,,not in a cabinet or anything that blocks airflow. I'm very careful when i occasionally dust around them & wipe them off. No kinks, moisture, rust, anything other than new looking, clean cables & connectors). The other cable i tried was new, though, just out of the package.
I have already tried everything that everyone has posted on these forums or others that had problems with Netgear cm600 modems not connecting, overheating, etc (everything i could find except slow or bad connection), including the troubleshooting steps from the links you posted from Netgear, in addition to the same from optimum website, before i posted here.
I will have to contact the ISP & ask them to check the signal & line quality up to the modem, but i will probably get a new modem first, in case they try to blame it on the modem (they will charge a fee if they claim it's my fault, which is what I'm trying to avoid). Thanks for the response.
Edit: i have heard too many horror stories about used electronics, so with my luck it's not worth the chance to me. I see everything listed on the site you listed is "sold as is" with no ability to return. The only guarantee is that it powers on. The fine print says some may be returned if listed in the description, but you have to pay the shipping and handling for return & you lose the shipping and handling charges you already paid for the device. I can't afford to take risks like that,, personally. Thanks for the suggestion, & that's amazing you were able to find such a great deal on a used modem.