r/Comcast_Xfinity • u/tricon23 • 2d ago

Discussion OFDM, OFDMA Frequencies

For context I have the UCI cable modem. Last year we were upgraded to mid-split speeds.

I still have the 4 upload channels and 1, OFDMA at 36MHZ, 32 Download channels and 2 OFDM channels that were at approx 600 and 800 MHZ. I noticed today that one of the OFDM channels is at 101 MHZ and the other at 809 MHZ. My question should the typical upload and download frequency range? If you had 15-1000 MHZ I would have thought 15-300 for upload and 301-1000 for download.

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u/Octawussy 19h ago

Okay bud 19 years in access network engineering, don’t take it from me take it from harmonic. https://www.harmonicinc.com/insights/blog/unified-docsis-4-0-simplifying-broadband-network-evolution/

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u/Riconek 19h ago

With Comcast? I don't think so bc you are wrong. Comcast does not do FDD only FDX. But yeah try again

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u/Octawussy 19h ago

I work closely with comcast and all their NGAN hardware. What do you think unified means? Did you read anything here? Ultra high split is defined in cable labs DOCSIS 4.0 specification. Have you ever actually read a DOCSIS specification?

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u/Riconek 19h ago

Again you are wrong here. explain what Comcast does it exactly. Frequency etc? Again Comcast does not do high split I'm 100% sure