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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.


BruceW
Gold Problem Solver
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27.8K Messages
2 hours ago
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.
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