T3 and T4 problem over 2 years now...

[axel4ever]

Hi There,

I'm looking for some support, as this takes way too long.

I had my router replaced twice, every engineer was tweaking power levels back and forth saying that they a right. All connectors and filters replaced. Recently (December 21st) I had new cable ran to my house and today cabling inside replaced.

The long story short, problem is still here, and nobody know what to do...

I have started logging the router data and some screenshots of the upload and download tabs.

Download link https://we.tl/t-tqOMQmYmMq

1 item

T3-T4_log.xlsx 3.15 MB

[Tudor]

In most of those snapshots the upstream power level if far too high. This is usually a loose connection, bad cable of street box problem. Unless there is an area problem you will need a technician’s visit to rectify.

Check with Area faults on 0800 561 0061 If you have a VM landline 150 this goes down to post code level. You could also try the web page status, but this is not recommended as it only covers issues that affect a very large number of customers.

VM will not dispatch any technicians while an area fault exists.

If no area faults found:

The primary place to report faults or for service requests is Customer Services on 0345 454 1111/150 if you have a VM landline or wait two or three days for a VM staff member to get to your post.

[axel4ever]

Hi Tudor,

Thank you for tat.

I know that the signal levels are to high, however past 2 years every technician visit was adjusting that by fiddling in the street box or adding or removing filters and 3 router replacements.

Signal too high, signal too low, signal too high, signal too low... I've replaced connector here, and I replaced connector there... 

Finally December 21st I had new cable ran to my property, but this made no change.

I keep hearing over and over the same explanations. I'm not saying that those are wrong, but maybe they are looking in the wrong place.

I don't know why signal fluctuates from 38 to 58, where majority of time is stable 38.

Please HELP !!!

[axel4ever]

Another quick question is my SNR ok???

Channel Frequency (Hz) Power (dBmV) SNR (dB) Modulation Channel ID

1	587000000	3.9	40	QAM 256	23
2	411000000	1.9	40	QAM 256	1
3	419000000	1.8	40	QAM 256	2
4	427000000	1.8	40	QAM 256	3
5	435000000	1.8	40	QAM 256	4
6	443000000	1.8	40	QAM 256	5
7	451000000	2	40	QAM 256	6
8	459000000	2	40	QAM 256	7
9	467000000	2.3	40	QAM 256	8
10	475000000	2.6	40	QAM 256	9
11	483000000	2.7	40	QAM 256	10
12	491000000	2.8	40	QAM 256	11
13	499000000	2.7	40	QAM 256	12
14	507000000	2.6	40	QAM 256	13
15	515000000	2.7	40	QAM 256	14
16	523000000	2.6	40	QAM 256	15
17	531000000	3.2	40	QAM 256	16
18	539000000	3.6	40	QAM 256	17
19	547000000	3.7	40	QAM 256	18
20	555000000	3.8	40	QAM 256	19
21	563000000	3.7	40	QAM 256	20
22	571000000	3.8	40	QAM 256	21
23	579000000	3.9	40	QAM 256	22
24	595000000	4	40	QAM 256	24
25	603000000	4	40	QAM 256	25
26	611000000	4.3	40	QAM 256	26
27	619000000	4.4	40	QAM 256	27
28	627000000	4.4	40	QAM 256	28
29	635000000	4.5	40	QAM 256	29
30	643000000	4.6	40	QAM 256	30
31	651000000	4.4	40	QAM 256	31

Downstream bonded channels

Channel Locked Status RxMER (dB) Pre RS Errors Post RS Errors

1	Locked	40	43795	2627
2	Locked	40	5107	1855
3	Locked	40	38537	2805
4	Locked	40	4350	1662
5	Locked	40	49901	2842
6	Locked	40	57747	3415
7	Locked	40	58138	2634
8	Locked	40	76036	3322
9	Locked	40	20690	2270
10	Locked	40	60184	3423
11	Locked	40	49833	2709
12	Locked	40	45994	2563
13	Locked	40	51354	1865
14	Locked	40	1364	663
15	Locked	40	1364	735
16	Locked	40	692	410
17	Locked	40	487	344
18	Locked	40	1007	665
19	Locked	40	450	422
20	Locked	40	379	331
21	Locked	40	838	632
22	Locked	40	407	434
23	Locked	40	780	653
24	Locked	40	1617	756
25	Locked	40	799	490
26	Locked	40	399	374
27	Locked	40	363	422
28	Locked	40	1117	701
29	Locked	40	236	320
30	Locked	40	191	329
31	Locked	40	188	307

[Sephiroth]

Perfect SNR at the time of the snapshot.

[axel4ever]

OK, I have found a way of sharing the spreadsheet without being accused of spreading malware.

Please find all the data I've gathered so far in the google doc link below:

https://docs.google.com/spreadsheets/d/1fL7N6haxP6i4GicfM5BiCe6Mqun6oh6a3R2EH4UBoB4/edit?usp=sharing

Please also keep in mind that all data is collected after the new cable being ran from the "junction box" to my property, and all in-house wiring and connectors replaced.

[axel4ever]

New link, as requested

https://docs.google.com/spreadsheets/d/1fL7N6haxP6i4GicfM5BiCe6Mqun6oh6a3R2EH4UBoB4/edit?usp=sharing

checked and confirmed by friends of mine... Link is working as intended.

[Client62]

Significant numbers of Downstream Pre RS and worse Post RS errors across all of the DOCSIS 3.0 channels.

[axel4ever]

Ok, great, thank you for that.

Any idea what can cause this?

[Sephiroth]

---

@Client62 wrote:

Significant numbers of Downstream Pre RS and worse Post RS errors across all of the DOCSIS 3.0 channels.

---

That diagnosis doesn't take into account the cumulative nature of the post-RS errors.

For the benefit of the OP, when there is noise on the line, data is likely to be corrupted.  Much of the time, using something known as "Reed-Solomon Error Correction" (hence "RS), corrupted data is corrected.  The amount of corrupted data is recorded as the "Pre-RS" number; the "Post-RS" number is the number of uncorrectable data symbols.   When a Hub is rebooted, it is not in a state of grace for a few moments and everything on that segment, whether for the particular hub or not, hits that hub and is unintelligible.  Post-RS errors are thus racked up in those moments.    Then there are Post-RS errors that arise because the SNR on the downstream falls to 34dB or below; noise is greater than signal.

Your snapshot shows 40dB SNR.  If it always does that, and the Post-RS errors aren't rising, then the numbers are legacy and can be ignored.

[axel4ever]

Hi Sephiroth,

Thank you for that, this is greatly appreciated.

Can you please take a look at the link I've included?

It contains data from 21st December and can give you better insight.

I do swear on my life this is not any malicious stuff. Please check on some mobile device first if you have any concerns.

This is simple google doc excel spreadsheet.

I'm only desperate for a solution, as nobody knows what the issue is and it s over 2 years already.

I would change a provider, but there is no one near the VM speed in Warwickshire for now... 

Well Fiber city will be here soon (TM), but who knows when.