I have a Netgear CM1150V Modem with a Netgear RAX80 router. When connected directly to the modem, I get speeds over 300 Mbps but when I connect to the router, it gets ~10Mbps. All other devices get their proper speeds on the router. I checked out my Modem log and there are a few unlocked channels and what looks like a lot of noise. Any suggestions?
I have logs but for some reason, cannot upload them here.
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If you get the advertised speed connected directly to the modem then that seems to point to the router being the bottleneck.
As for the logs, since you are a new poster, pics need to be approved by a Forum Admin. That could take some time. In the interim, you could try hosting it at one of those free third-party pic hosting sites like Imgur or Photobucket and post the link to it here.
Besides the modem's error log entries, please also post the *Downstream Power Level*, the *Upstream Power Level*, and the *SNR* (Signal to Noise Ratio) numbers.
The signal stats are o/k.
I've also received "critical' messages in the log but didn't see them in the last batch until I just looked...
|Tue May 19 08:20:24 2020||Critical (3)||Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=28:80:88:cf:ef:78;CMTS-MAC=00:01:5c:75:d2:55;CM-QOS=1.1;CM-VER=3.1;|
But as stated, if you get the proper speed directly from the modem, it can't be a problem with the Comcast connection, the bottleneck appears to be the router, and / or "the other devices".
Goodluck with it !