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Forum Discussion
Very slow Internet Download Speeds even after Xfinity repairs in my area
Even after Xfinity completed repairs in my area for performance related issues and even though I worked with Xfinity support, I continue to get extremely slow internet download speeds (about 10-20% o...
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.
Be sure your using a good quality LAN cable between the modem and router. CAT6 is recommended.
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/
Xfinity said the power levels were fine and they attempted to reprovision the modem. I removed a splitter which didn’t help. A new coax cable arrives today which hopefully will help. If the new cable doesn’t improve performance at the current outlet, I intend to try it at a different one.
Paolo
Paolo
pmb1976 wrote:
Xfinity said the power levels were fine and they attempted to reprovision the modem. I removed a splitter which didn’t help. A new coax cable arrives today which hopefully will help. If the new cable doesn’t improve performance at the current outlet, I intend to try it at a different one.
PaoloOf course Xfinity said the power levels were fine. They do not want to do anything. Xfinity's definition of fine for the power level and Netgear's definition are most likely something different. Check for yourself. See reference here:
https://kb.netgear.com/24311/Power-level-guidelines-for-a-NETGEAR-cable-modem-router
Pay close attention to the first three sentences at the top.
Repeat question: What is the brand name and model number of your router?
Repeat question: What is the brand name and model number of the device you are running the throughput tests on?
The upstream power levels are a bit high but the downstream power levels are within the range based on the documentation in the link. Screenshots of the power levels are provided in the original post.
Please see my most recent post about running tests in the basement of my building where I have a simplified set up and document all the components involved in the test.
pmb1976 wrote:The upstream power levels are a bit high but the downstream power levels are within the range based on the documentation in the link. Screenshots of the power levels are provided in the original post.
Please see my most recent post about running tests in the basement of my building where I have a simplified set up and document all the components involved in the test.
The Netgear screenshots posted with your initial message were of too low resolution to clearly read. See attached.
The same with the summary graphs of your series of tests.
What was the interval of time you used between the throughput tests?
You mentioned Xfinity attempted to re-provision your modem. What happened?
Here is some good background information on cable internet connections.
https://www.duckware.com/tech/solving-intermittent-cable-modem-issues.html
Have there been any recent driver or firmware updates on your computer?
One thing to check is the network profile on your computer. It should be private and not public. I have seen Windows updates that changed the profile as part of the update process.
You may have to tell Xfinity you are still having an issue with your connection.
