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Forum Discussion
CM1200 Downstream, Upstream lights cycle through dysfunctional pattern, no Internet connection
My ISP is Cox and there was an outage in my area 3 days ago that they claim is now resolved. My neighbors have Cox and their internet is working. But my CM1200 has been stuck ever since the outage in a pattern where the power light is on consistently, but the Downstream light blinks for 1-2 min while no activity on Upstream, then Downstream goes solid for 1-2 min while Upstream blinks, then Upstream goes dark and Downstream starts blinking again and the cycle repeats. There is no Internet connection.
I'm logged in to the router and watch its stats change as the cycle continues. I attached a picture of the stats while the Upstream light is blinking and Downstream light is solid.
Cox says they need to send a tech out but can't for another 6 days and I work from home so I'm hoping to get this sorted on my own asap. Any insight is appreciated.
I'm logged in to the router and watch its stats change as the cycle continues. I attached a picture of the stats while the Upstream light is blinking and Downstream light is solid.
Cox says they need to send a tech out but can't for another 6 days and I work from home so I'm hoping to get this sorted on my own asap. Any insight is appreciated.
4 Replies
Please post the Event Log page as well. https://kb.netgear.com/30008/How-do-I-view-or-clear-the-event-logs-on-my-NETGEAR-cable-modem-or-modem-router
There is only 1 channel showing activity and theres a ton of Correct and un-correctables. There should be more channels being used.
Power off the modem and disconnect the ISP cable coax from the modem. Then power ON. After the power LED is solid, press the reset button for 10 seconds then release. Then plug back in the ISP coax cable.
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#M12853Power should be with these specs:
https://kb.netgear.com/24311/Power-level-guidelines-for-a-NETGEAR-cable-modem-router
https://www.duckware.com/tech/solving-intermittent-cable-modem-issues.htmlBe sure your using a good quality LAN cable between the modem and router. CAT6 is recommended.
What is the brand and model of the host wifi router connected to the modem?- The router I have paired with the modem is a tp link ax1800. I went through the procedure you shared (power off for 1 min, disconnect coax, power on, reset, reconnect coax) and it's still cycling through the same light pattern. I attached the event logs to this post.
Would checking the signal strength be something Cox should be able to do over the phone? I called them already and all they wanted to do was send out a tech in 6 days. This was all working just fine until a few days ago when the outage happened. All the connections are solid and cables are the right kind.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.
