Virgin Media Community

[stuartjl]

Noticed increased buffering on the likes of Amazon etc, checked download speeds and around 47Mbps as opposed to 200+. Upload doesn't seem to have changed.

Hub network status is rather noisy, is this potentially a hub or street cabinet issue?

Status:-
Acquired Downstream Channel(Hz) 299000000 Locked
Ranged Upstream Channel(Hz) 60300000 Ranged
Provisioning State Online Operational

Downstream:-
Downstream bonded channels

Channel Frequency (Hz) Power (dBmV) SNR (dB) Modulation Channel ID
1 299000000 0.5 42 QAM 256 21
2 139000000 1.7 40 QAM 256 1
3 147000000 1.6 41 QAM 256 2
4 155000000 1.6 41 QAM 256 3
5 163000000 1.3 41 QAM 256 4
6 171000000 0.7 41 QAM 256 5
7 179000000 0.9 41 QAM 256 6
8 187000000 1 41 QAM 256 7
9 195000000 0.8 41 QAM 256 8
10 203000000 0.6 41 QAM 256 9
11 211000000 1.1 35 QAM 256 10
12 219000000 0.8 0 QAM 256 11
13 227000000 0.5 32 QAM 256 12
14 235000000 0.2 41 QAM 256 13
15 243000000 0.2 41 QAM 256 14
16 251000000 0.3 41 QAM 256 15
17 259000000 0.4 41 QAM 256 16
18 267000000 0.6 41 QAM 256 17
19 275000000 0.2 41 QAM 256 18
20 283000000 0.7 42 QAM 256 19
21 291000000 0.7 42 QAM 256 20
22 307000000 0.8 42 QAM 256 22
23 315000000 0.6 41 QAM 256 23
24 323000000 0.4 41 QAM 256 24
25 331000000 0.2 41 QAM 256 25
26 339000000 0 41 QAM 256 26
27 347000000 0.3 41 QAM 256 27
28 355000000 0.6 42 QAM 256 28
29 363000000 0.3 42 QAM 256 29
30 371000000 0.2 42 QAM 256 30
31 379000000 0.3 42 QAM 256 31
Downstream bonded channels

Channel Locked Status RxMER (dB) Pre RS Errors Post RS Errors
1 Locked 42 12 83
2 Locked 40 2036 1193751
3 Locked 41 2374 83336
4 Locked 41 1480 23660
5 Locked 41 831 17171
6 Locked 41 76 12936
7 Locked 41 20 3351
8 Locked 41 16 391
9 Locked 41 16 174
10 Locked 41 14 170
11 Locked 35 12 211
12 Locked 0 0 0
13 Locked 32 1900 117454
14 Locked 41 13 180
15 Locked 41 13 236
16 Locked 41 13 338
17 Locked 41 13 289
18 Locked 41 12 152
19 Locked 41 13 129
20 Locked 42 15 69
21 Locked 42 12 27
22 Locked 42 13 25
23 Locked 41 13 11
24 Locked 41 12 4
25 Locked 41 12 6
26 Locked 41 3 11
27 Locked 41 13 3
28 Locked 42 12 3
29 Locked 42 5 9
30 Locked 42 15 4
31 Locked 42 15 2

Upstream:-

Upstream bonded channels

Channel Frequency (Hz) Power (dBmV) Symbol Rate (ksps) Modulation Channel ID
1 60300000 48.5 5120 QAM 64 1
2 53700000 48 5120 QAM 64 2
3 46200000 47.8 5120 QAM 64 3
4 39400000 47.5 5120 QAM 64 4
Upstream bonded channels

Channel Channel Type T1 Timeouts T2 Timeouts T3 Timeouts T4 Timeouts
1 ATDMA 0 0 0 0
2 ATDMA 0 0 0 0
3 ATDMA 0 0 0 0
4 ATDMA 0 0 0 0

Thanks,

  Stu

[Cardiffman281 · Accepted solution]

Yup  you have loads of post RS errors. Check all the connections are tight and try a pinhole reset of the hub otherwise you will probably need an engineer. 

[Cardiffman281]

It might also be useful to check for local issues https://www.virginmedia.com/help/service-status 

[stuartjl]

I had checked that again, there were some issues a couple of weeks ago i think but nothing current.

[carl_pearce]

Looks like you have a SNR issue on some of your downstream channels:

Channel Locked Status RxMER (dB) Pre RS Errors Post RS Errors
1 Locked 42 12 83
2 Locked 40 2036 1193751
3 Locked 41 2374 83336
4 Locked 41 1480 23660
5 Locked 41 831 17171
6 Locked 41 76 12936
7 Locked 41 20 3351
8 Locked 41 16 391
9 Locked 41 16 174
10 Locked 41 14 170
11 Locked 35 12 211
12 Locked 0 0 0
13 Locked 32 1900 117454
14 Locked 41 13 180
15 Locked 41 13 236
16 Locked 41 13 338
17 Locked 41 13 289
18 Locked 41 12 152
19 Locked 41 13 129
20 Locked 42 15 69
21 Locked 42 12 27
22 Locked 42 13 25
23 Locked 41 13 11
24 Locked 41 12 4
25 Locked 41 12 6
26 Locked 41 3 11
27 Locked 41 13 3
28 Locked 42 12 3
29 Locked 42 5 9
30 Locked 42 15 4
31 Locked 42 15 2

[stuartjl]

Actually tried a 'factory reset' first (ie via the web admin) and that seems to have resolved the problem at the moment. Back to 217 Mbps download.

I shall monitor and if this happens again shall try the pinhole reset. I believe the difference is the pinhole reset removes any firmware updates, whereas the factory reset does not...

Just as a FYI for any readers the 'reload configuration settings' from a file produced immediately before the reset attempt results in an error, 'file not recognised', but did appear to have restored settings.....

[stuartjl]

Yes, two in question are still different to the rest following the reset but channel 11 seems ok...

11 Locked 40 0 30
12 Locked 31 8808 836829
13 Locked 33 4319 43446

[stuartjl]

Coincidentally did have an issue resulting in complete outage for about an hour in my area yesterday evening that engineers were 'on the case'.

This morning speed tests showing 216/20 down/up but hub status still showing loads of errors, sufficient to warrant a engineer?

Downstream bonded channels

Channel Frequency (Hz) Power (dBmV) SNR (dB) Modulation Channel ID
1 299000000 1.2 42 QAM 256 21
2 139000000 2.9 41 QAM 256 1
3 147000000 2.9 42 QAM 256 2
4 155000000 2.9 42 QAM 256 3
5 163000000 2.5 42 QAM 256 4
6 171000000 2 42 QAM 256 5
7 179000000 2.2 42 QAM 256 6
8 187000000 2.2 42 QAM 256 7
9 195000000 2.1 42 QAM 256 8
10 203000000 1.9 42 QAM 256 9
11 211000000 2.2 40 QAM 256 10
12 219000000 2 29 QAM 256 11
13 227000000 1.7 33 QAM 256 12
14 235000000 1.2 42 QAM 256 13
15 243000000 0.9 42 QAM 256 14
16 251000000 0.7 42 QAM 256 15
17 259000000 0.6 42 QAM 256 16
18 267000000 0.4 42 QAM 256 17
19 275000000 1 42 QAM 256 18
20 283000000 1.4 42 QAM 256 19
21 291000000 1.5 42 QAM 256 20
22 307000000 1.3 42 QAM 256 22
23 315000000 1.4 42 QAM 256 23
24 323000000 1 42 QAM 256 24
25 331000000 0.7 41 QAM 256 25
26 339000000 0.6 42 QAM 256 26
27 347000000 0.9 42 QAM 256 27
28 355000000 1 42 QAM 256 28
29 363000000 0.8 42 QAM 256 29
30 371000000 0.7 42 QAM 256 30
31 379000000 0.7 42 QAM 256 31
Downstream bonded channels

Channel Locked Status RxMER (dB) Pre RS Errors Post RS Errors
1 Locked 42 769 4903
2 Locked 41 8133 266010871
3 Locked 42 3316 43920061
4 Locked 42 5752 120003
5 Locked 42 8552 140304
6 Locked 42 2285 64989
7 Locked 42 4921 41707
8 Locked 42 2279 15380
9 Locked 42 1492 3488
10 Locked 42 517 778
11 Locked 40 1655 29027
12 Locked 29 132218144 166277847
13 Locked 33 567897 31486550
14 Locked 42 1333 3798
15 Locked 42 1037 5072
16 Locked 42 981 5340
17 Locked 42 916 5483
18 Locked 42 925 6014
19 Locked 42 1053 6104
20 Locked 42 777 5462
21 Locked 42 675 5091
22 Locked 42 641 3740
23 Locked 42 604 3006
24 Locked 42 672 2811
25 Locked 41 545 2259
26 Locked 42 477 2492
27 Locked 42 585 2481
28 Locked 42 501 2680
29 Locked 42 440 1966
30 Locked 42 330 879
31 Locked 42 506 1948

[carl_pearce]

You still have a SNR issue on at least two channels, so yes, an engineer visit is required.

[Adduxi]

FYI, the PostRS erros, should remain at zero.  Any increasing numbers are a fault.  These are "lost" data packets and need to be retransmitted, hence they should ideally be zero.   PreRS errors are okay as they are errors, but corrected by the Hub without data loss.