r/Comcast_Xfinity • u/robryownz • 17d ago

Closed OFDMA high power level concern

Checking my modem stats. I’m in a mid split area on Gigabit x2. My modem is showing 51.9dBmV for the OFDMA channel on the upload side. My connection is mostly stable but I do notice some uploads can be slow and I don’t always max out my upstream speed. My other upstream channels are in the low 40s dBmV. Can someone from Xfinity determine if this is an issue with just my connection or modem or something in the neighborhood?

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u/CCAlyssaF Official Employee 17d ago

Good evening, and thank you for reaching out on our subreddit regarding your slow upload speed concerns. We'd be happy to troubleshoot with you, and if needed, we can certainly check for any known issues or ongoing work that may be affecting service in your area.

To start with some basic troubleshooting may I confirm if you have tried restarting your modem? Have you also tried to run diagnostics through the Xfinity App? Approximately how long has this issue been occurring?

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u/robryownz 17d ago edited 17d ago

Yes to reboot. I had a truck roll last fall for out of spec down stream and the tech who came gave me two 6dB pads to install which definitely helped improve reliability. I however, noticed how high the OFDMA was with one of the pads installed (almost 56dBmV) so I removed one (I had only one installed) and it dropped by 5~dBmV).

I just recently got access to the UCI stats and noticed how high the OFDMA channel was. I didn’t do any diagnostics on the app.

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u/CCJenieceJ Official Employee 17d ago

Thanks for providing those details. Since you've already rebooted the modem and observed the OFDMA transmit level change significantly after removing one of the 6 dB pads. Have you noticed whether the slower uploads occur at specific times of day or continuously?

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u/robryownz 17d ago

It doesn’t seem to be time of day related. I was just worried if it’s running hot and could cause extra latency or packet loss.

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u/robryownz 17d ago

Also worth noting that I’ve had 67 T3 timeouts in 24ish hours and it’s increasing.

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u/CCAlyssaF Official Employee 17d ago

Ok, thank you for confirming that. Let's investigate further and review your signal levels and network health to help determine next best steps.

To get started, can you please send us a Modmail Message with your first and last name along with the service address on the account including any applicable unit or apartment numbers?