Skip to main content
user_718yz9's profile
user_718yz9
1st Topic

New Poster

 • 

2 Messages

Wednesday, June 3rd, 2026 12:03 AM

XB8 on 2.5G / 250 Mbps plan stuck at 40 Mbps upload XB8 Gateway

I need help to reach/escalate to Advanced Repair / Network Provisioning, not basic Wi-Fi or device troubleshooting.

I am on a 2.5 Gbps download / 250 Mbps upload plan with an XB8 gateway. The XB8’s own speed-to-gateway test matches all device tests and is capped around 1000 Mbps down / 39–40 Mbps up. Wired and Wi-Fi 6E show the same upload cap.

Gateway diagnostics show no upstream OFDMA channel locked. There is no OFDMA upstream channel present.

Downstream is locked and error counts are clean. Upstream power is roughly 41.5–45.5 dBmV. This does not appear to be a MacBook, Wi-Fi, Ethernet, or customer-device issue.

I've spent over 16 hours on this issue between phone support, store visits, and Technicians. None of them understand that this is a comcast/xfinity issue.

Question

 • 

Updated 

9 hours ago

15

1

0

Oldest First
Selected Oldest First
XfinityGabriel

Official Employee

 • 

3.3K Messages

9 hours ago

 

user_718yz9, Hi there! Thanks for reaching out. I really appreciate you laying all of that out so clearly. I can definitely see you’ve already done a ton of deep troubleshooting here, and I agree this doesn’t point to a typical device or WiFi issue. Based on what you’re describing, especially the consistent ~40 Mbps upload cap and lack of an upstream OFDMA lock on a 2.5G plan, that does sound like something beyond standard support scope and more in line with provisioning or a network-side configuration issue. You shouldn’t have had to spend that amount of time trying to explain this, so I’m sorry for the runaround you’ve experienced so far. You've reached the right place for help.
 

Please also note that sending unsolicited private messages to me or any other user is a direct violation of our forum guidelines. In the future, we ask that you please find the most appropriate public board for your question type and post it there before sending a direct message. If needed, we may invite you to send us a direct message. I do see that you have already sent a direct message, so we will continue speaking with you from there. 

 

 

 

0

0

forum icon

New to the Community?

Start Here