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105 Messages

Wed, Sep 23, 2020 3:00 PM

modem shows high error rates after comcast outage


Someone help.

This happend after an internet outage that was fixed today.

Now my connection is less than half the speed it was before the outage.

Below info shows alot of "unknown"  .  Before the outage, there were always a modulation QAM256 and ATDMA all filled under upload stream.


Here is my modem info: 

Startup ProcedureProcedureStatusComment

Acquire Downstream Channel525000000 HzLocked
Connectivity StateOKOperational
Boot State  
Configuration FileOK 


Downstream Bonded ChannelsChannel Modulation Frequency Power SNR Correctables Uncorrectables

1QAM256525000000 Hz-19.2 dBmV31.5 dB110
2QAM256531000000 Hz-20.3 dBmV28.7 dB138987365
3unknown537000000 Hz-22.9 dBmV0.0 dB1810497216
4unknown543000000 Hz-23.8 dBmV0.0 dB00
5QAM256555000000 Hz-18.6 dBmV30.9 dB3100
6QAM256561000000 Hz-18.0 dBmV31.7 dB00
7QAM256567000000 Hz-18.6 dBmV31.1 dB9860
8QAM256573000000 Hz-21.1 dBmV28.6 dB62223266509


Total Correctables Total Uncorrectables


Upstream Bonded ChannelsChannel US Channel Type Symbol Rate Frequency Power

1ATDMA5120 Ksym/sec22800000 Hz55.0 dBmV
2Unknown0 Ksym/sec0 Hz0.0 dBmV
3Unknown0 Ksym/sec0 Hz0.0 dBmV
4Unknown0 Ksym/sec0 Hz0.0 dBmV


Accepted Solution




86.6K Messages

8 m ago

Your connection quality is horrible ! Everything is way out of spec ! It's probably best to call in and report this issue. 1800comcast


Good luck with it !

I am not a Comcast Employee.
I am a Customer Expert volunteering my time to help other customers here in the Forums.
We ask that you post publicly so people with similar questions may benefit from the conversation.
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Regular Contributor


105 Messages

8 m ago

Thanks .  I'll need it.

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