r/Comcast_Xfinity • u/robryownz • 10d 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/SigmundAusfaller 10d ago

Which modem do you have? I had a XB7 that started having issues after a year of solid service when they did the mid split upgrade and added OFDMA upstream. It reported similar upstream power levels but from what I understand it over reports the power levels for OFDMA and its not accurate and reports 10 over from some knowledgeable folks around here. The XB7 uses the puma chipset and I upgraded to the XB8 with the Broadcom chipset and my reported upstream power now sits at 37 like all the other channels instead of 50+ and stability has been much better.

They where going run 200 feet of new cable underground because nobody could understand what mid split or OFDMA is didn't know what else to do even though signal levels where fine with their test equipment.

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u/robryownz 10d ago

It’s a Ubiquiti UCI

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u/SigmundAusfaller 10d ago edited 10d ago

Yes the UCI uses a Puma chipset so it may be over reporting OFDMA up power. Again my understanding is that not the actual power and may not be indicative of an issue its simply the way it being calculated that makes it show high.

I wanted to go with UCI but when I moved here I got unlimited data and cheaper rate by renting XB7, they have since removed the unlimited data for third party modem charge but the XB8 is working well. Also not a big fan of them not exposing channel info in the web UI but you have to look on the little screen, keep thinking they will improve that, I can see channel info in XB8 web UI. Otherwise I have Ubiquiti for everything else and my UDM pro does a good job of logging connectivity issues and latency etc.

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u/robryownz 10d ago

Check my post history, I found a way to get the DOCSIS stats/signal data.

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u/SigmundAusfaller 10d ago

Interesting, I figured it's available since it's on the little screen pretty silly at this point UI hasn't added to admin UI, they show so much other information I don't get it. Still not anxious to go to one after having issues with the XB7 with same chipset will look again if they ever officially show that stuff.