Virgin Media Community

[ClMcGee]

Huge Post-RS increase just in one night

Downstream bonded channels

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

1	387000000	4.6	37	256 qam	32
2	203000000	4.6	36	256 qam	9
3	211000000	4.5	35	256 qam	10
4	219000000	4.9	36	256 qam	11
5	227000000	4.9	36	256 qam	12
6	235000000	4.5	36	256 qam	13
7	243000000	4.1	36	256 qam	14
8	251000000	4	36	256 qam	15
9	259000000	4.5	36	256 qam	16
10	267000000	4.9	36	256 qam	17
11	275000000	4.4	36	256 qam	18
12	283000000	4.5	37	256 qam	19
13	291000000	4.9	37	256 qam	20
14	299000000	5.5	37	256 qam	21
15	307000000	5.5	37	256 qam	22
16	315000000	5.3	37	256 qam	23
17	323000000	5.3	37	256 qam	24
18	331000000	5.5	37	256 qam	25
19	339000000	5.5	37	256 qam	26
20	347000000	5.3	37	256 qam	27
21	355000000	4.9	37	256 qam	28
22	363000000	4.9	37	256 qam	29
23	371000000	5	37	256 qam	30
24	379000000	5	37	256 qam	31

Downstream bonded channels

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

1	Locked	37.6	162	457
2	Locked	36.3	436	498
3	Locked	35.7	472	504
4	Locked	36.6	368	433
5	Locked	36.6	323	461
6	Locked	36.6	319	640
7	Locked	36.3	299	479
8	Locked	36.6	285	559
9	Locked	36.3	299	540
10	Locked	36.6	288	447
11	Locked	36.6	273	393
12	Locked	37.3	257	420
13	Locked	37.6	246	447
14	Locked	37.6	240	394
15	Locked	37.6	236	347
16	Locked	37.3	204	350
17	Locked	37.6	242	401
18	Locked	37.6	221	490
19	Locked	37.6	202	495
20	Locked	37.6	192	393
21	Locked	37.6	190	429
22	Locked	37.3	201	471
23	Locked	37.6	156	571
24	Locked	37.3	152	611

[gitty]

You don't happen to have a copy of the signal levels when the power drops?

[jbrennand]

Looks like there may be noise getting in somewhere. It will need VM to take a look and probably a Tech visit to investigate. Call it in or wait for VM to respond here in a day or so

[ClMcGee]

Thanks again for help. Hope that 4th tech guy will solve it 😄

[ClMcGee]

Not the latest logs unfortunately, though in some cases it drops like from 5-6 to 3-4 downstream (and goes up from 38-39 to 42-45 upstream) and my connection is lost, though that power level is within DOCSIS 3 specs

[gitty]

A single channel can carry over 42000 codewords per second, so it just takes a moment to make those numbers. Maybe a loose connector that moves with the wind.

[ClMcGee]

I will try my best to catch the outage moment and post the logs here

[jbrennand]

Did you spot any connection/cable issues when you inspected/unplugged it all ?

Noise issues can be tricky to track down as you can be affected by other customer's connections too

[ClMcGee]

Everything "coax" (wall to hub and outside box) were nice and tight. My own ethernet cables seem to be fine too (hub to my router, ax50 and router to PC), also should state that my ethernet cable did not change since it began to drop out (by that I mean that it was fine before with that cable). That is not a big deal, but I don't think the problem is on my side, not sure of course.

[ClMcGee]

Managed to catch the "drop" moment

Downstream bonded channels

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

1	387000000	3	37	256 qam	32
2	203000000	3.2	36	256 qam	9
3	211000000	2.7	36	256 qam	10
4	219000000	3	36	256 qam	11
5	227000000	3	36	256 qam	12
6	235000000	2.9	36	256 qam	13
7	243000000	2.5	36	256 qam	14
8	251000000	2.5	37	256 qam	15
9	259000000	3	36	256 qam	16
10	267000000	3.7	37	256 qam	17
11	275000000	3.4	37	256 qam	18
12	283000000	2.7	37	256 qam	19
13	291000000	2.7	37	256 qam	20
14	299000000	3.4	37	256 qam	21
15	307000000	3.7	37	256 qam	22
16	315000000	3.5	37	256 qam	23
17	323000000	3.7	37	256 qam	24
18	331000000	3.9	38	256 qam	25
19	339000000	4	37	256 qam	26
20	347000000	3.7	37	256 qam	27
21	355000000	3.4	37	256 qam	28
22	363000000	3.4	37	256 qam	29
23	371000000	3.5	37	256 qam	30
24	379000000	3.5	37	256 qam	31

Downstream bonded channels

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

1	Locked	37.6	162	457
2	Locked	36.3	436	498
3	Locked	35.7	472	504
4	Locked	36.6	368	433
5	Locked	36.6	323	461
6	Locked	36.6	319	640
7	Locked	36.3	299	479
8	Locked	36.6	285	559
9	Locked	36.3	299	540
10	Locked	36.6	288	447
11	Locked	36.6	273	393
12	Locked	37.3	257	420
13	Locked	37.6	246	447
14	Locked	37.6	240	394
15	Locked	37.6	236	347
16	Locked	37.3	204	350
17	Locked	37.6	242	401
18	Locked	37.6	221	490
19	Locked	37.6	202	495
20	Locked	37.6	192	393
21	Locked	37.6	190	429
22	Locked	37.3	201	471
23	Locked	37.6	156	571
24	Locked	37.3	152	611

Upstream bonded channels

Channel Frequency (Hz) Power (dBmV) Symbol Rate (ksps) Modulation Channel ID

1	46199998	48.8	5120	64 qam	3
2	32599974	37.5	5120	64 qam	5
3	39400000	48.8	5120	64 qam	4
4	53700004	48.8	5120	64 qam	2

Upstream bonded channels

Channel Channel Type T1 Timeouts T2 Timeouts T3 Timeouts T4 Timeouts

1	ATDMA	0	0	0	0
2	ATDMA	0	0	23	0
3	ATDMA	0	0	8	0
4	ATDMA	0	0	0	0