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DonT
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Thursday, July 31st, 2025

Netgear CM3000 upstream light is out

I have a 6 month old Netgear CM3000. Working fine. No issues. 2300+ Mbps down , 357 Mbps up. Looks like the upstream led is burnt out. Did a chat with Netgear. He basically told me the reason the light is out ,is due to my Upstream power level is not within the 38 - 48 dBmV.  Thoughts? 

Upstream Bonded Channels
Channel   LockedStatus  ChannelType ChannelID   SymbolRate        Frequency       Power     
      1       Locked       ATDMA      1       5120 Ksym/sec       16400000 Hz       37.3 dBmV
      2       Locked       ATDMA      2       5120 Ksym/sec       22800000 Hz       37.5 dBmV
      3       Locked       ATDMA      3       5120 Ksym/sec       29200000 Hz       37.8 dBmV
      4       Locked       ATDMA      4       5120 Ksym/sec       35600000 Hz       38.0 dBmV
      5       Not Locked       Unknown      0       0       0       0.0
      6       Not Locked       Unknown      0       0       0       0.0
      7       Not Locked       Unknown      0       0       0       0.0
      8       Not Locked       Unknown      0       0       0       0.0

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6 hours ago

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EG

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112.2K Messages

2 days ago

That's not correct. As long as an upstream channel is locked in, the light should be lit steadily. Your's are indeed locked in and the power levels at that snapshot in time were good / in spec. So it could be that the LED is burned out or the firmware / hardware driver for it is malfunctioning.

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DonT

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Update. I powered off the modem for a couple of minutes. On power up, the upstream LED lights up , then eventully goes out. So looks like it's not burnt out.

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2 days ago

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XfinityGabriel

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2.5K Messages

 

DonT, Thanks for reaching back out and letting us know. As a paying consumer myself, I understand the importance of having your internet services working correctly. Our team of experts is happy to assist over social media. I would like to see if I can pull up your upstream signal levels on our end. To check on this,

please send us a direct message with your first/last name and full address. You can start by clicking the "direct message" icon in the upper right page of our forum page. Once you click on that, input our shared handle Xfinity Support to send us a direct message.

 

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6 hours ago

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EG

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112.2K Messages

2 days ago

FWIW, there can still be intermittent malfunctioning even when things are not completely burned out. 

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