Visitor

 • 

1 Message

11/09/2026 10:33 PM

Upload stuck at ~5 Mbps since neighborhood node work: no OFDMA upstream on MB8611

Gigabit plan, customer-owned Motorola MB8611. Downstream is fine (32 SC-QAM channels plus OFDM locked, SNR ~43 dB, ~600 Mbps), but upload tests at ~5 Mbps on a wired connection with nothing else running.

Modem shows 4 SC-QAM upstream channels locked at 48–50 dBmV and no OFDMA upstream channel. This started around when crews ran fiber and worked on the node in our neighborhood.

Already done: phone and chat support, multiple reboots, and a “reprovision”. No change. Two promised callbacks never came.

Requesting: someone to verify the modem’s provisioning/bootfile matches the plan, confirm whether our node was converted to mid-split and the modem isn’t being assigned OFDMA upstream, and open a maintenance/plant ticket if the provisioning is correct. Happy to provide the modem MAC and account details by DM.

Oldest First
Selected Oldest First

Gold Problem Solver

 • 

27.8K Messages

2 hours ago

Gigabit plan, customer-owned Motorola MB8611 ... no OFDMA upstream channel ...

The MB8611 is not compatible with "enhanced" upstream speeds, and so will not have any OFMDA channels. Follow the "See all modems" link near the bottom of https://www.xfinity.com/support/internet/customerowned, and then check the devices listed under the "Compatible modems for enhanced speeds" heading. The 8611 is not on that list. In fact no Motorola models are. 

forum icon

New to the Community?

Start Here