Not applicable

High number of uncorrectable errors

I want to start off by saying that I had my internet service installed just yesterday (100mbs down/10mbs up) in my apartment. I've been keeping track of my connection, and noticed a few uncorrectable errors yesterday (few hundred to be exact). Since then, they've jumped exponetially to the point where I thought it would be a cause for concern. I've had a couple of slow page loads, and a couple of lag spikes noticable while gaming.  Currently posting these from my Ubee DDW36C.


Downstream Bonded Channels Channel Lock Status Modulation Channel ID Frequency Power SNR Correctables Uncorrectables

1 QAM256 621000000 Hz11.1 dBmV42.5 dB4045 8745
2 QAM256 567000000 Hz11.5 dBmV43.3 dB3748 8568
3 QAM256 573000000 Hz11.3 dBmV43.1 dB3952 8286
4 QAM256 579000000 Hz11.3 dBmV43.1 dB4032 8025
5 QAM256 585000000 Hz11.5 dBmV43.1 dB4123 8466
6 QAM256 591000000 Hz11.3 dBmV42.9 dB4191 8571
7 QAM256 597000000 Hz11.4 dBmV42.9 dB4102 8295
8 QAM256 603000000 Hz11.3 dBmV42.8 dB3929 8653
9 QAM256 609000000 Hz11.3 dBmV42.8 dB4147 8621
10 QAM256 615000000 Hz11.1 dBmV42.7 dB4173 8456
11 QAM256 627000000 Hz11.2 dBmV42.7 dB4236 8125
12 QAM256 651000000 Hz11.3 dBmV42.6 dB4195 8350
13 QAM256 663000000 Hz11.2 dBmV42.4 dB4362 7937
14 QAM256 687000000 Hz11.3 dBmV42.2 dB4233 7598
15 QAM256 693000000 Hz11.3 dBmV42.3 dB4126 7454
16 QAM256 705000000 Hz11.1 dBmV42.0 dB4250 7229


Total Correctables Total Uncorrectables

65844 131379


Upstream Bonded Channels Channel Lock Status US Channel Type Channel ID Symbol Rate

Frequency Power

1 ATDMA 5120 Ksym/sec30600000 Hz 41.5 dBmV
2 TDMA 2560 Ksym/sec18500000 Hz 39.5 dBmV
3 ATDMA 5120 Ksym/sec23300000 Hz 40.3 dBmV
4 ATDMA 5120 Ksym/sec37000000 Hz 43.0 dBmV



System Up Time1 days 06h:10m:44s
Network AccessAllowed

Startup ProcedureProcedureStatusComment

Acquire Downstream Channel621000000 HzLocked
Connectivity StateOKOperational
Boot State  
Configuration FileOK 


Wondering if this many errors are a cause for concern? Live in Los Angeles, CA (90038)

Everyone's Tags (2)

Re: High number of uncorrectable errors


That's pretty bad and since it's even on all channels it's a dirty/ noisy amplifier in the downstream path.. Is this an apartment building?

 They're the worst for poor distribution.

 Uncorrectables should NEVER exceed correctables, they also require a resend of data all the way back to whatever website you were connected to which shoves latency and jitter way up for both you and everyone else on the node.


Not applicable

Re: High number of uncorrectable errors

Yeah, it's an apartment building.  I probably should've mentioned that I'm not very knowledgeable about these things. As far as solutions go, what can I do on my end to try and fix the issue?


Re: High number of uncorrectable errors

This is multiple bad connections in the building... Good luck. Call twc if you're having speed and dropouts, there's always blame on the building owners by TWC and the owners blame TWC, they never get fixed.



Proven Sharer

Re: High number of uncorrectable errors

Your DS levels are too high and are overloading the modem.  You need to insert some extra loss to get them down under +10.0 dBmV.  The easiest way is to add a two-port splitter with one port terminated.  That will reduce your DS signal level by 3.5 dB, and the US level goes up by the same 3.5 dB. 


Re: High number of uncorrectable errors

Karl, I don't think that will help... The attenuator needs to go before the amplifier...

"garbage in, garbage out +1"


Not applicable

Re: High number of uncorrectable errors

So correct me if I'm wrong, but it's an internal wiring issue related to the apartment building, and there's not much that can be done?


Re: High number of uncorrectable errors

TWC needs to come out and tweak the amplifies input level down so that it's not into saturation and generating noise and intermodulation. This needs to be done before the amplifier not in or after it.