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Upgraded from CM600 to CM1200, upload speed halved
I figured I'd ask here before I return the new modem. I have an xfinity 400mbps down/100mbps upload speed plan. I had been using the CM600 for a while, which gave a good 450mbps/12mbps down/up. Xfin...
Be 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?
Try Speed testing with a wired PC connected to the CM1200 modem with out a wifi router in between.
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. Otherwise cable connection data looks good. Power levels are good as well.
The router is Netgear Nighthawk mesh WiFi 6