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Re: Speed always drops to 2Mbps (from 100Mbps) within 15min after modem restart

Regular Visitor

Re: Speed always drops to 2Mbps (from 100Mbps) within 15min after modem restart

Still having the issue so I referred to the docs and posted below

Downstream Channel:

Screen Shot 2020-02-07 at 6.48.55 PM.png

Upstream Channel: 

Screen Shot 2020-02-07 at 6.49.00 PM.png

Modem Error Logs:Screen Shot 2020-02-07 at 6.48.34 PM.pngMake and Model of Mode: Netgear CM400

Make and Model of Router: tp-link TL-WR940N


My speed tier is Performance Plus

Download Speed: 60Mbps

Upload Spped: 5Mpbs

 

I have not contacted Comcast or had a tech visit me. 

My lights on my modem are all green

While directly connected to the modem:
Screen Shot 2020-02-07 at 7.18.45 PM.png

Expert

Re: Speed always drops to 2Mbps (from 100Mbps) within 15min after modem restart

Can't see your pics. Since you are a new poster, they need to be approved by a Forum Admin. That could take some time. In the interim, you could try hosting them at one of those free third-party pic hosting sites like Imgur or Photobucket and post the link to them here.



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Regular Visitor

Re: Speed always drops to 2Mbps (from 100Mbps) within 15min after modem restart

I believe you should be able to see them now, also it seems like my comment is not linked but the original post in reference was for https://forums.xfinity.com/t5/Your-Home-Network/Speed-always-drops-to-2Mbps-from-100Mbps-within-15mi...

Expert

Re: Speed always drops to 2Mbps (from 100Mbps) within 15min after modem restart

The signal stats are o/k. Is this with a WiFi connection ? If so, for a test, does a computer hardwired directly to the TL-WR940N router with an ethernet cable have the same problem ?



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Regular Visitor

Re: Speed always drops to 2Mbps (from 100Mbps) within 15min after modem restart

I haven't tried the test when it was pluged to the router but the above speed test happend when I was directly plugged to the modem. Hence, I am thinking that it's originating from the modem or past. 

Expert

Re: Speed always drops to 2Mbps (from 100Mbps) within 15min after modem restart

O/k good. That was going to be my next suggestion and it's the ultimate test that points to an issue between you and the Comcast system / WAN and not an issue on your LAN.

 

Even though the signal stats looked o/k at that snapshot in time, the error log entries confirm that something is going on. Perhaps there is noise ingress into the line(s) somewhere.

 

There are other signal stat figures that can't be read by the modem. They are the "Upstream Rx Power" (Upstream Receive Power Level), the "Upstream SNR Ch." (Upstream Signal To Noise Ratio), and the "Upstream ICFR" (In Channel Frequency Response). These are as equally important in diagnosing connectivity issues as are the modem's stats.


I'm going to escalate your issue to the Comcast corporate employees that are available to these boards. They can check the CMTS (Cable Modem Termination System) for any real time degradation and / or error reports, see your node / cable plant and modem health, and see whether or not everything is in the green zone. They can also see a history plot for the modem and poll for those upstream receive signal stats.

You should get a reply here in your topic. Good luck !



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Official Employee

Re: Speed always drops to 2Mbps (from 100Mbps) within 15min after modem restart

Greetings, @chocolateMoose! I appreciate you taking the time to reach out to us here on the forums. I hope you are having an amazing day. I apologize to hear you are running into issues with your internet dropping to low speeds. That's certainly frustrating. I would like to see what could be going on. Can you please send me a PM with your first and last name so I may further assist you?

 

To send a private message, please click my name "ComcastMichael" then select "Send a Message" on the right side.


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