High number of uncorrectable errors

[rayne]

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 Hz	11.1 dBmV	42.5 dB	4045	8745
2		QAM256		567000000 Hz	11.5 dBmV	43.3 dB	3748	8568
3		QAM256		573000000 Hz	11.3 dBmV	43.1 dB	3952	8286
4		QAM256		579000000 Hz	11.3 dBmV	43.1 dB	4032	8025
5		QAM256		585000000 Hz	11.5 dBmV	43.1 dB	4123	8466
6		QAM256		591000000 Hz	11.3 dBmV	42.9 dB	4191	8571
7		QAM256		597000000 Hz	11.4 dBmV	42.9 dB	4102	8295
8		QAM256		603000000 Hz	11.3 dBmV	42.8 dB	3929	8653
9		QAM256		609000000 Hz	11.3 dBmV	42.8 dB	4147	8621
10		QAM256		615000000 Hz	11.1 dBmV	42.7 dB	4173	8456
11		QAM256		627000000 Hz	11.2 dBmV	42.7 dB	4236	8125
12		QAM256		651000000 Hz	11.3 dBmV	42.6 dB	4195	8350
13		QAM256		663000000 Hz	11.2 dBmV	42.4 dB	4362	7937
14		QAM256		687000000 Hz	11.3 dBmV	42.2 dB	4233	7598
15		QAM256		693000000 Hz	11.3 dBmV	42.3 dB	4126	7454
16		QAM256		705000000 Hz	11.1 dBmV	42.0 dB	4250	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/sec	30600000 Hz	41.5 dBmV
2		TDMA		2560 Ksym/sec	18500000 Hz	39.5 dBmV
3		ATDMA		5120 Ksym/sec	23300000 Hz	40.3 dBmV
4		ATDMA		5120 Ksym/sec	37000000 Hz	43.0 dBmV

Status

System Up Time	1 days 06h:10m:44s
Network Access	Allowed

Startup ProcedureProcedureStatusComment

Acquire Downstream Channel	621000000 Hz	Locked
Connectivity State	OK	Operational
Boot State
Configuration File	OK
Security	Enabled	BPI+

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

[MsRaye]

Yup!

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.

[rayne]

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?

[MsRaye]

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.

[karlbeckman]

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. 

[MsRaye]

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

"garbage in, garbage out +1"

[rayne]

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?

[MsRaye · Accepted solution]

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.