Visitor

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3 Messages

Wednesday, June 24th, 2026 6:13 PM

XB8 stuck on sub-split upstream -- no mid-split, upload capped at 35 Mbps

My XB8 (CGM4981COM) is ranging only on subsplit upstream channels (10–40 MHz), with no midsplit and no OFDMA upstream, so my upload is capped at ~35 Mbps despite a 1.2 Gig plan. Please check whether midsplit is live on my node, and if so push the enhancedupload bootfile and reprovision my upstream. If frontline can't, please open an engineering ticket.

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Visitor

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3 Messages

14 hours ago

Following up — still seeing sub‑split‑only upstream, no OFDMA; can someone from Xfinity Support take a look?

Contributor

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20 Messages

13 hours ago

Hi im having the same problem neighbor has lower speed plan there getting over 100mb upload im stuck at around 40mb upload on Gigabit extra we both have a xb8 gateway? My signals levels are even better to then there's we both have ofdm on both download and upload signals. so must be the configuration boot file ? Reason im not getting mid or high split speed we both are wired direct to street no splitters at all.

What should i do to fix mine can you send a update ?

(edited)

Official Employee

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1.2K Messages

1 hour ago

Hello @user_xrcap3, thank you for taking the time to leave a post. Sorry to hear you’re experiencing issues with your upload speeds. I can understand how frustrating that must be, especially when you’re expecting improved performance but are still seeing the older speeds. When testing the speeds, are you hardwired directly to the modem or wireless? 

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