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Forum Discussion
What does a flashing green upstream light mean on the CM500 modem?
I am troubleshooting a problem with my CM500 cable modem where the Internet sporadically drops or partially drops.
What does a flashing green upstream light mean? I have looked in Netgear's official documentation, and that mode is not listed:
https://www.netgear.com/support/product/CM500#docs
If you open the user manual and visit pages 6 and 8, you'll notice the upstream LED should be either off, solid amber, blinking amber, or solid green. So what does blinking green mean? This is a key piece of information I need to troubleshoot my problem, since the ISP (Cox) has already replaced the entire cable drop, and I've tried everything from wiring the desktop directly to the modem, to not using a power strip and plugging the adapter directly into the wall (Cox seems obsessed with that solution).
The modem is only a year old, I own it, and I bought it specifically to fix the same problem (sporadic drops).
Does anyone know what flashing green means? This would help my troubleshooting. Thanks!
8 Replies
If you ONLINE LED is SOLID GREEN and US is FLASHING GREEN, that means, device is in PARTIAL US SERVICE.
Most likely, there are IMPAIRMENTS in the cox line which is causing not all USs to connect.
Can you be more specific? What does partial upstream service mean?
Here's a sample of what I was seeing during one of those outages:
are you sure you captured this exactly when US lights were flashing or after sometime?
the screenshots show Upstream channels are ok.
