on 10-06-2021 23:54
Hi all, I've looked around for a while, and the values I see on this forum for dB and SNR vary widely.
I'm on the 1gig package with a hub 4. It's in modem mode, with Ubiquiti UDM-Pro controlled network internally. Getting frequent internet disconnects lasting a few minutes each time. Ubiquiti kit is always completely stable and isn't showing anything unusual in the logs.
I didn't see a huge variance over a few minutes of refreshing on the dB/SNR values below.
Appreciate any advice you can give me. Thanks.
3.0 Downstream channels
Channel | Frequency (Hz) | Power (dBmV) | SNR (dB) | Modulation | Channel ID |
1 | 139000000 | 1.7 | 39 | QAM256 | 1 |
2 | 147000000 | 1.5 | 39 | QAM256 | 2 |
3 | 155000000 | 1.4 | 40.4 | QAM256 | 3 |
4 | 163000000 | 1.3 | 40.4 | QAM256 | 4 |
5 | 171000000 | 1.2 | 40.4 | QAM256 | 5 |
6 | 179000000 | 1.4 | 40.4 | QAM256 | 6 |
7 | 187000000 | 1.5 | 40.4 | QAM256 | 7 |
8 | 195000000 | 1.5 | 40.4 | QAM256 | 8 |
9 | 203000000 | 1.5 | 40.9 | QAM256 | 9 |
10 | 211000000 | 1.2 | 40.4 | QAM256 | 10 |
11 | 219000000 | 1.1 | 40.4 | QAM256 | 11 |
12 | 227000000 | 1.3 | 40.4 | QAM256 | 12 |
13 | 235000000 | 1.4 | 39 | QAM256 | 13 |
14 | 243000000 | 1.4 | 39 | QAM256 | 14 |
15 | 251000000 | 1.2 | 39 | QAM256 | 15 |
16 | 259000000 | 1.3 | 40.4 | QAM256 | 16 |
17 | 267000000 | 1.7 | 40.4 | QAM256 | 17 |
18 | 275000000 | 2.1 | 40.4 | QAM256 | 18 |
19 | 283000000 | 1.6 | 39 | QAM256 | 19 |
20 | 291000000 | 1.3 | 39 | QAM256 | 20 |
21 | 299000000 | 1.1 | 39 | QAM256 | 21 |
22 | 307000000 | 1.3 | 39 | QAM256 | 22 |
23 | 315000000 | 1.9 | 40.4 | QAM256 | 23 |
24 | 323000000 | 2.4 | 40.4 | QAM256 | 24 |
25 | 363000000 | 1.4 | 39 | QAM256 | 25 |
26 | 371000000 | 1.6 | 40.4 | QAM256 | 26 |
27 | 379000000 | 1.8 | 39 | QAM256 | 27 |
28 | 387000000 | 1.8 | 38.6 | QAM256 | 28 |
29 | 395000000 | 1.8 | 39 | QAM256 | 29 |
30 | 403000000 | 1.3 | 39 | QAM256 | 30 |
31 | 411000000 | 1 | 39 | QAM256 | 31 |
Answered! Go to Answer
on 14-06-2021 11:53
For your connection I would expect a maximum of 51 - 52 dBmV on your upstream.
Since you have a channel at 56.5, this could be causing some issues.
I'd wait until a VM person notices this post and maybe they'll run some tests on your line and maybe organise an engineer.
on 14-06-2021 11:59
on 10-06-2021 23:54
More data:
3.0 Downstream channels
Channel | Lock Status | RxMER (dB) | Pre RS Errors | Post RS Errors |
1 | Locked | 38.983261 | 347 | 0 |
2 | Locked | 38.983261 | 528 | 0 |
3 | Locked | 40.366287 | 670 | 0 |
4 | Locked | 40.366287 | 484 | 0 |
5 | Locked | 40.366287 | 345 | 0 |
6 | Locked | 40.366287 | 16 | 0 |
7 | Locked | 40.366287 | 0 | 0 |
8 | Locked | 40.366287 | 0 | 0 |
9 | Locked | 40.946209 | 0 | 0 |
10 | Locked | 40.366287 | 0 | 0 |
11 | Locked | 40.366287 | 0 | 0 |
12 | Locked | 40.366287 | 0 | 0 |
13 | Locked | 38.983261 | 0 | 0 |
14 | Locked | 38.983261 | 0 | 0 |
15 | Locked | 38.983261 | 0 | 0 |
16 | Locked | 40.366287 | 0 | 0 |
17 | Locked | 40.366287 | 0 | 0 |
18 | Locked | 40.366287 | 0 | 0 |
19 | Locked | 38.983261 | 0 | 0 |
20 | Locked | 38.983261 | 0 | 0 |
21 | Locked | 38.983261 | 0 | 0 |
22 | Locked | 38.983261 | 0 | 0 |
23 | Locked | 40.366287 | 0 | 0 |
24 | Locked | 40.366287 | 0 | 0 |
25 | Locked | 38.983261 | 0 | 0 |
26 | Locked | 40.366287 | 0 | 0 |
27 | Locked | 38.983261 | 0 | 0 |
28 | Locked | 38.605377 | 0 | 0 |
29 | Locked | 38.983261 | 0 | 0 |
30 | Locked | 38.983261 | 0 | 0 |
31 | Locked | 38.983261 | 0 | 0 |
3.1 Downstream channels
Channel | Channel Width (MHz) | FFT Type | Number of Active Subcarriers | Modulation (Active Profile) | First Active Subcarrier (Hz) |
159 | 96 | 4K | 1880 | QAM256 | 759 |
3.1 Downstream channels
Channel ID | Lock Status | RxMER Data (dB) | PLC Power (dBmV) | Correcteds (Active Profile) | Uncorrectables (Active Profile) |
159 | Locked | 41 | -0.4 | 0 | 0 |
3.0 Upstream channels
Channel | Frequency (Hz) | Power (dBmV) | Symbol Rate (ksps) | Modulation | Channel ID |
1 | 39400000 | 51.5 | 5120 KSym/sec | 64QAM | 4 |
2 | 46200000 | 52.3 | 5120 KSym/sec | 64QAM | 3 |
3 | 53700000 | 52.8 | 5120 KSym/sec | 64QAM | 2 |
4 | 60300000 | 53.3 | 5120 KSym/sec | 64QAM | 1 |
3.0 Upstream channels
Channel | Channel Type | T1 Timeouts | T2 Timeouts | T3 Timeouts | T4 Timeouts |
1 | US_TYPE_STDMA | 0 | 0 | 10 | 0 |
2 | US_TYPE_STDMA | 0 | 0 | 10 | 0 |
3 | US_TYPE_STDMA | 0 | 0 | 12 | 0 |
4 | US_TYPE_STDMA | 0 | 0 | 12 | 0 |
11-06-2021 02:25 - edited 11-06-2021 02:26
Post a BQM so we check the stability of the line
You may need to put the virgin hub back into router mode so vm staff can interrogate more.
on 11-06-2021 09:36
on 11-06-2021 09:49
on 11-06-2021 09:51
on 11-06-2021 10:13
on 12-06-2021 20:20
on 12-06-2021 20:22
on 14-06-2021 08:48
Quick update:
Went back to router mode last night, BQM still showing 100% dropped packets even though everything is reset to factory defaults (changed admin password and SSID only).
https://www.thinkbroadband.com/broadband/monitoring/quality/share/96e9f285e76d2ad8ae82da823de1faaeb8...
I've also taken an updated reading for power and SNR since, big difference from the first one:
3.0 Downstream channels
Channel | Frequency (Hz) | Power (dBmV) | SNR (dB) | Modulation | Channel ID |
1 | 139000000 | 0.5 | 39 | QAM256 | 1 |
2 | 147000000 | 0.3 | 38.6 | QAM256 | 2 |
3 | 155000000 | 0.2 | 39 | QAM256 | 3 |
4 | 163000000 | 0.1 | 39 | QAM256 | 4 |
5 | 171000000 | 0 | 38.6 | QAM256 | 5 |
6 | 179000000 | 0.3 | 40.4 | QAM256 | 6 |
7 | 187000000 | 0.5 | 39 | QAM256 | 7 |
8 | 195000000 | 0.4 | 39 | QAM256 | 8 |
9 | 203000000 | 0.4 | 39 | QAM256 | 9 |
10 | 211000000 | 0.1 | 38.6 | QAM256 | 10 |
11 | 219000000 | 0 | 39 | QAM256 | 11 |
12 | 227000000 | 0.2 | 39 | QAM256 | 12 |
13 | 235000000 | 0.4 | 39 | QAM256 | 13 |
14 | 243000000 | 0.4 | 38.6 | QAM256 | 14 |
15 | 251000000 | 0.3 | 38.6 | QAM256 | 15 |
16 | 259000000 | 0.5 | 38.6 | QAM256 | 16 |
17 | 267000000 | 0.8 | 38.6 | QAM256 | 17 |
18 | 275000000 | 1.2 | 38.6 | QAM256 | 18 |
19 | 283000000 | 0.8 | 38.6 | QAM256 | 19 |
20 | 291000000 | 0.6 | 38.6 | QAM256 | 20 |
21 | 299000000 | 0.3 | 39 | QAM256 | 21 |
22 | 307000000 | 0.5 | 39 | QAM256 | 22 |
23 | 315000000 | 1.1 | 40.4 | QAM256 | 23 |
24 | 323000000 | 1.6 | 39 | QAM256 | 24 |
25 | 363000000 | 0.5 | 39 | QAM256 | 25 |
26 | 371000000 | 0.8 | 39 | QAM256 | 26 |
27 | 379000000 | 1 | 38.6 | QAM256 | 27 |
28 | 387000000 | 1 | 38.6 | QAM256 | 28 |
29 | 395000000 | 1.1 | 39 | QAM256 | 29 |
30 | 403000000 | 0.8 | 38.6 | QAM256 | 30 |
31 | 411000000 | 0.3 | 38.6 | QAM256 | 31 |