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Need someone to verify Signal Levels.
Hi, I’m on the 1.2 Gbps plan and using a DOCSIS 3.1 modem (Netgear CM1000).
My modem shows that OFDMA upstream is not locking, and I’m only getting ~400 Mbps on a wired 1.0 Gbps link.
Downstream is perfect (43 dB SNR, +3 dBmV), but upstream power is in the 46–47 dBmV range, and I see Dynamic Range Window violations and T3 timeouts in the logs.
This looks like a line signal problem preventing full provisioning or performance, and I’d like:
Signal levels checked and validated
A bootfile resend
Or a line tech scheduled if needed
XfinityThomasA
Official Employee
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2.2K Messages
5 days ago
Hello, user_4gvrmg! Thank you for joining the Forums community and reaching out to us here for help troubleshooting your Xfinity internet. You've reached the right place. Please send a direct chat message with your full name and complete service address to “Xfinity Support”. To do so, click on the chat icon located at the top right of this forum's page.
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- XfinityThomasA
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EG
Expert
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109.7K Messages
4 days ago
@user_4gvrmg @XfinityThomasA
Please circle back here and post any possible solutions for the issue here in these open public forums so that all readers here may benefit from the exchange / info. This is in keeping with the spirit for which these public help forums were originally intended. Thank you.
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