NETGEAR is aware of a growing number of phone and online scams. To learn how to stay safe click here.
Forum Discussion
CM1000v2 extremely slow upload speeds
Swtiched from a Comcast XB8 gateway that was not staying in "bridge" mode to my own CM1000v2. I'm getting the expected 750mbps download on a 1gig plan, but the uploads are crazy slow (5-6mbps). I've had Comcast reprovision it twice with no improvement. I've seen on here that plan speeds of 200 or more only get 5-6mbps with these. Is that correct? Comcast chat/phone support doesn't understand the diffence between a cable channel and a modem channel and tried to get me to enable parental lock lol. I know when I had a tech out and they tested the lines, he mentioned the neighbors were missing OFDMA channels, but mine was good. Seems like the OFDMA issues are probably related, but I was getting better uploads with the XB8, although still not close to plan average. 50-100 at best when on 2Gig next gen. I switched to the CM1000v2 because we kept having issues with them and I wasn't able to get Xfinity to fix or warranty my Storm Ready wifi and Xfi pods, which are locked to their gateways and I needed to get an eero mesh system working. The XB8's kept having issues staying in bridge mode and passing connectivity to the internet.
6 Replies
Well power levels are are the low side but with in specs:
https://kb.netgear.com/24311/Power-level-guidelines-for-a-NETGEAR-cable-modem-router
Correctables and Un-correctables are good.Please post the Event Log data from that page.
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?short CAT 6 cable directly from the LAN port on the CM1000v2 to the 1gig port on my Eero Pro v6 wifi router. Same results on the 2.5gig port. Using the Xfinity modem I was at least getting 100mbps upload, same cabling, coax, etc.
Speed test directly with a PC connected to the CM modem to compare speed results.
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 have noticed in this forum and on Reddit that many folks seem to be getting the same 6mbps on Comcast with these, which seems odd to me. I know it's not "next gen" capable, but 6 still seems pretty darn low.
