Incrementing Correctable and Uncorrectable codewords

I'm having issues with intermittent internet drops. Checking on the XB7, I see "Correctable and Uncorrectable codewords" errors incrementing on every channel, with the worst channel being the channel using OFDM modulation (Channel 25).

Channel info:

Channel ID	17	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	18	19	20	21	22	23	24	26	27	28	29	30	31	32	25
Lock Status	Locked	Locked	Locked	Locked	Locked	Locked	Locked	Locked	Locked	Locked	Locked	Locked	Locked	Locked	Locked	Locked	Locked	Locked	Locked	Locked	Locked	Locked	Locked	Locked	Locked	Locked	Locked	Locked	Locked	Locked	Locked	Locked
Frequency	519 MHz	411 MHz	417 MHz	423 MHz	429 MHz	435 MHz	441 MHz	453 MHz	459 MHz	465 MHz	471 MHz	477 MHz	483 MHz	489 MHz	495 MHz	507 MHz	513 MHz	525 MHz	531 MHz	537 MHz	543 MHz	555 MHz	561 MHz	567 MHz	573 MHz	579 MHz	585 MHz	591 MHz	597 MHz	603 MHz	609 MHz	693000000
SNR	40.5 dB	42.0 dB	41.8 dB	41.6 dB	41.5 dB	41.4 dB	41.3 dB	41.1 dB	41.2 dB	41.1 dB	41.1 dB	41.1 dB	40.9 dB	40.9 dB	40.8 dB	40.7 dB	40.6 dB	40.3 dB	40.1 dB	39.9 dB	39.8 dB	39.3 dB	39.4 dB	38.7 dB	39.1 dB	39.5 dB	39.4 dB	39.4 dB	39.6 dB	39.8 dB	39.9 dB	38.6 dB
Power Level	1.9 dBmV	5.6 dBmV	5.0 dBmV	4.5 dBmV	4.4 dBmV	4.1 dBmV	3.9 dBmV	3.4 dBmV	3.6 dBmV	3.7 dBmV	3.7 dBmV	3.7 dBmV	3.3 dBmV	3.2 dBmV	3.2 dBmV	2.7 dBmV	2.4 dBmV	1.5 dBmV	1.3 dBmV	1.1 dBmV	1.0 dBmV	0.5 dBmV	0.2 dBmV	0.2 dBmV	0.7 dBmV	0.7 dBmV	0.6 dBmV	0.9 dBmV	1.2 dBmV	1.6 dBmV	1.7 dBmV	2.0 dBmV
Modulation	256 QAM	256 QAM	256 QAM	256 QAM	256 QAM	256 QAM	256 QAM	256 QAM	256 QAM	256 QAM	256 QAM	256 QAM	256 QAM	256 QAM	256 QAM	256 QAM	256 QAM	256 QAM	256 QAM	256 QAM	256 QAM	256 QAM	256 QAM	256 QAM	256 QAM	256 QAM	256 QAM	256 QAM	256 QAM	256 QAM	256 QAM	OFDM

Errors Sample 1:

Channel ID	17	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	18	19	20	21	22	23	24	25	26	27	28	29	30	31	32
Unerrored Codewords	64994417	63561274	64871061	64876280	64658237	64891841	63587681	64900783	64906366	64912124	64919520	64921370	64927861	64932031	64938128	64946174	64951154	64954001	64959745	64963941	64971180	64975182	64964421	63729353	26937233	64967303	64974145	64979358	64982017	64985808	64989121	64994417
Correctable Codewords	2852	517	3150	3135	3135	3345	132	3294	3205	3175	2978	3053	3113	3263	3240	2843	2955	3336	3262	3017	2893	2927	3112	83	26600884	2863	2707	2440	2712	3099	3138	2852
Uncorrectable Codewords	10602	2261	13373	13449	12306	12757	690	13669	13305	12248	11351	11573	12518	13446	12689	10672	10710	13375	12824	11570	9496	10991	11887	433	18932	11138	9005	9164	10939	11377	11609	10602

Errors Sample 2 - captured 2 hrs later

Channel ID	17	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	18	19	20	21	22	23	24	25	26	27	28	29	30	31	32
Unerrored Codewords	464466173	463031773	464343880	464347978	464130190	464364344	463060675	464373036	464378867	464384940	464392088	464393608	464400301	464404488	464410708	464418858	464423756	464425916	464431468	464436424	464443872	464447871	464436236	463202283	174126174	464437194	464445004	464449346	464451764	464456240	464459796	464466173
Correctable Codewords	3257	838	3464	3428	3453	3632	475	3603	3503	3450	3327	3370	3482	3573	3538	3158	3305	3677	3548	3289	3165	3345	3556	600	171406976	3236	3197	2953	3304	3656	3630	3257
Uncorrectable Codewords	11716	3313	14453	14542	13309	13692	1618	14809	14400	13186	12111	12379	13490	14587	13779	11393	11381	14537	13877	12357	10017	11918	13197	1780	20034	12517	10260	10838	12967	13169	13325	11716

I have a straightforward setup. Feed from street into house, hits a 2 way splitter to (1) X1 DVR box and (1) XB7. I had an Xfinity tech out roughly 3 months ago who found that there was noise coming BACK from the STB and replaced the cable ends on that coax line. Afterwards he said it looked good. The issue with internet dropping has still occurred since, but more frequently in the past week. I've replaced the cable from the wall to the XB7, and errors are still incrementing (no drops yet, however, since I only replaced this cable 4 hours ago.

From everything I understand, this type of problem usually indicates a cable issue. But that said, I can't find it. And I can't replace the cable that is run through the walls from the basement to where I keep the cable modem, but I have a hard time understanding how that cable could just go bad.

Looking for advice and direction on advanced troubleshooting for this issue.

What should be expected for correctable and uncorrectable codewords? Should these normally be 0, if ideal conditions are met?
What's the best way to test the quality of the cable that runs in my walls? How can I tell if this cable is a problem?
How can I detect if my STB is once again back feeding noise into the coax line? Would a noise filter work?

Responses

XfinityBenjaminM

Official Employee

•

1.4K Messages

3 months ago

npsxuser Hello! Can you please send us a Direct Message with your full name and address? We will need to investigate this further. Here are instructions on how to send us a DM in case you need them:

Click "Sign In" if necessary
• Click the "Direct Message" icon (upper right corner of this page)
• Click the "New message" (pencil and paper) icon
• Type "Xfinity Support" in the to line and select "Xfinity Support" from the drop-down list
• Type your message in the text area near the bottom of the window
• Press Enter to send your message

0

N

npsxuser

2 Messages

2 months ago

The modem still reports errors on all channels since I replaced the cable between the wall and the modem, BUT it has not dropped out since. So, maybe a bad cable but still probably an issue with the in wall run.

0

Your Home Network

npsxuser

Incrementing Correctable and Uncorrectable codewords

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