Virgin Media Community

[razorhazor]

Hi All, just plugged the Hub4 in, how do the stats look? is the Power OK? I have 2 attenuators plugged in so not sure if I need them.

3.0 Downstream channels

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

12	450250000	-5.7	34.9	QAM256	12
10	434250000	-5.7	35.1	QAM256	10
11	442250000	-5.9	34.9	QAM256	11
13	458250000	-6.1	34.9	QAM256	13
14	466250000	-5.8	34.9	QAM256	14
15	474250000	-6.1	34.9	QAM256	15
16	482250000	-6.1	34.9	QAM256	16
17	490250000	-6.4	35.1	QAM256	17
18	498250000	-6.5	34.9	QAM256	18
19	506250000	-7.1	35.1	QAM256	19
20	514250000	-7.1	34.6	QAM256	20
21	522250000	-7	34.9	QAM256	21
22	530250000	-6.8	35.1	QAM256	22
23	538250000	-6.8	34.9	QAM256	23
24	546250000	-6.8	35.1	QAM256	24
25	554250000	-7	34.5	QAM256	25
26	562250000	-7	34.9	QAM256	26
27	570250000	-7.2	34.9	QAM256	27
28	578250000	-7.3	34.3	QAM256	28
29	586250000	-7.7	34.3	QAM256	29
30	594250000	-7.2	34.3	QAM256	30
31	602250000	-7.1	34.3	QAM256	31
32	610250000	-7	34.8	QAM256	32
33	618250000	-7.1	35.1	QAM256	33
34	626250000	-7.7	34.3	QAM256	34
35	634250000	-8	34.3	QAM256	35
36	658250000	-8	34.9	QAM256	36
37	666250000	-8	34.5	QAM256	37
38	674250000	-8.1	34.5	QAM256	38
39	682250000	-8.2	34.9	QAM256	39
40	690250000	-8.1	34.9	QAM256	40

3.0 Downstream channels

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

12	Locked	34.925610	1	0
10	Locked	35.083549	3	0
11	Locked	34.925610	4	0
13	Locked	34.925610	4	0
14	Locked	34.925610	2	0
15	Locked	34.925610	1	0
16	Locked	34.925610	5	0
17	Locked	35.083549	9	0
18	Locked	34.925610	32	0
19	Locked	35.083549	55	0
20	Locked	34.625977	65	0
21	Locked	34.925610	99	0
22	Locked	35.083549	90	0
23	Locked	34.925610	157	0
24	Locked	35.083549	208	0
25	Locked	34.483570	282	0
26	Locked	34.925610	307	0
27	Locked	34.925610	385	0
28	Locked	34.345688	767	0
29	Locked	34.345688	1228	0
30	Locked	34.345688	772	0
31	Locked	34.345688	471	0
32	Locked	34.773209	244	0
33	Locked	35.083549	106	0
34	Locked	34.345688	117	0
35	Locked	34.345688	95	0
36	Locked	34.925610	10	0
37	Locked	34.483570	6	0
38	Locked	34.483570	13	0
39	Locked	34.925610	7	0
40	Locked	34.925610	9	0

3.1 Downstream channelsChannel Channel Width (MHz) FFT Type Number of Active Subcarriers Modulation (Active Profile) First Active Subcarrier (Hz)

41

96

4K

1880

QAM4096

728

3.1 Downstream channelsChannel ID Lock Status RxMER Data (dB) PLC Power (dBmV) Correcteds (Active Profile) Uncorrectables (Active Profile)

41

Locked

36

-8.5

66526438

352508

[legacy1]

---

@razorhazor wrote:

I have 2 attenuators plugged in so not sure if I need them.

---

You likely don't need them depending on what they are but I'm guessing remove both.

[Richw1982]

Hi, what value attenuators have you got on there, also what are your upstream levels?  Forward levels should be between -6 and +10 ideally around 0/+2.  Return levels 33-51 ideally around 45

[razorhazor]

thats what I thought. Should I be aiming for a power of between -5 and 10?

[razorhazor]

Thanks. They're both 10db.

[legacy1]

---

@razorhazor wrote:
Thanks. They're both 10db.

---

That one hot potato🥔 yes you can remove one.

[razorhazor]

thanks legacy1! better? (removed one) or is the potatoe still hot?!

3.0 Downstream channels

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

12	450250000	3.9	35.6	QAM256	12
10	434250000	3.9	35.6	QAM256	10
11	442250000	3.7	35.8	QAM256	11
13	458250000	3.4	35.6	QAM256	13
14	466250000	3.7	35.6	QAM256	14
15	474250000	3.4	35.6	QAM256	15
16	482250000	3.4	35.6	QAM256	16
17	490250000	3.1	35.6	QAM256	17
18	498250000	3	35.6	QAM256	18
19	506250000	2.5	35.6	QAM256	19
20	514250000	2.5	35.6	QAM256	20
21	522250000	2.7	35.8	QAM256	21
22	530250000	2.7	35.6	QAM256	22
23	538250000	2.8	35.6	QAM256	23
24	546250000	2.7	35.6	QAM256	24
25	554250000	2.7	35.6	QAM256	25
26	562250000	2.6	35.6	QAM256	26
27	570250000	2.5	35.6	QAM256	27
28	578250000	2.4	35.1	QAM256	28
29	586250000	2	34.9	QAM256	29
30	594250000	2.5	35.1	QAM256	30
31	602250000	2.7	35.6	QAM256	31
32	610250000	2.8	35.6	QAM256	32
33	618250000	2.7	35.6	QAM256	33
34	626250000	2	35.1	QAM256	34
35	634250000	1.6	35.1	QAM256	35
36	658250000	1.7	35.6	QAM256	36
37	666250000	1.8	35.6	QAM256	37
38	674250000	1.6	35.6	QAM256	38
39	682250000	1.7	35.8	QAM256	39
40	690250000	1.7	35.8	QAM256	40

3.0 Downstream channels

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

12	Locked	35.595078	10	4185
10	Locked	35.595078	14	4554
11	Locked	35.779911	5	4856
13	Locked	35.595078	10	4363
14	Locked	35.595078	8	4156
15	Locked	35.595078	7	4143
16	Locked	35.595078	5	4537
17	Locked	35.595078	428	358
18	Locked	35.595078	2314	2728
19	Locked	35.595078	2006	2642
20	Locked	35.595078	277	420
21	Locked	35.779911	16	2953
22	Locked	35.595078	4	3017
23	Locked	35.595078	3	3151
24	Locked	35.595078	8	3101
25	Locked	35.595078	18	3124
26	Locked	35.595078	9	2935
27	Locked	35.595078	8	3193
28	Locked	35.083549	10	3152
29	Locked	34.925610	43	3465
30	Locked	35.083549	17	3473
31	Locked	35.595078	10	3144
32	Locked	35.595078	1419	1288
33	Locked	35.595078	11	3656
34	Locked	35.083549	16	3803
35	Locked	35.083549	18	3805
36	Locked	35.595078	5	3748
37	Locked	35.595078	1390	1555
38	Locked	35.595078	5	3824
39	Locked	35.779911	10	3893
40	Locked	35.779911	36	1226

3.1 Downstream channelsChannel Channel Width (MHz) FFT Type Number of Active Subcarriers Modulation (Active Profile) First Active Subcarrier (Hz)

41

96

4K

1880

QAM4096

728

3.1 Downstream channelsChannel ID Lock Status RxMER Data (dB) PLC Power (dBmV) Correcteds (Active Profile) Uncorrectables (Active Profile)

41

Locked

37

1.3

896945

0

[legacy1]

Looks better but SNR could be better but may be fine.

You can setup a BQM to see if you get packet loss
https://www.thinkbroadband.com/broadband/monitoring/quality

[razorhazor]

thanks for that, is this now too far? (no Attenuators plugged in)

3.0 Downstream channels
Channel Frequency (Hz) Power (dBmV) SNR (dB) Modulation Channel ID
12 450250000 14.699997 35.595078 QAM256 12
10 434250000 13.800003 35.779911 QAM256 10
11 442250000 14.099998 35.595078 QAM256 11
13 458250000 13.800003 35.595078 QAM256 13
14 466250000 13.500000 35.779911 QAM256 14
15 474250000 13.199997 35.779911 QAM256 15
16 482250000 13.699997 35.779911 QAM256 16
17 490250000 13.300003 35.779911 QAM256 17
18 498250000 12.800003 35.595078 QAM256 18
19 506250000 12.400002 35.595078 QAM256 19
20 514250000 12.800003 35.595078 QAM256 20
21 522250000 13.300003 35.595078 QAM256 21
22 530250000 12.900002 35.779911 QAM256 22
23 538250000 12.400002 35.595078 QAM256 23
24 546250000 12.500000 35.595078 QAM256 24
25 554250000 12.699997 35.595078 QAM256 25
26 562250000 12.500000 35.595078 QAM256 26
27 570250000 12.199997 35.595078 QAM256 27
28 578250000 11.900002 35.595078 QAM256 28
29 586250000 11.800003 35.083549 QAM256 29
30 594250000 12.900002 35.083549 QAM256 30
31 602250000 13.099998 35.595078 QAM256 31
32 610250000 12.599998 35.595078 QAM256 32
33 618250000 12.500000 35.779911 QAM256 33
34 626250000 12.099998 35.595078 QAM256 34
35 634250000 11.900002 35.083549 QAM256 35
36 658250000 11.599998 35.595078 QAM256 36
37 666250000 12.599998 35.779911 QAM256 37
38 674250000 12.500000 35.779911 QAM256 38
39 682250000 11.900002 35.595078 QAM256 39
40 690250000 11.699997 35.779911 QAM256 40


3.0 Downstream channels
Channel Lock Status RxMER (dB) Pre RS Errors Post RS Errors
12 Locked 35.595078 144 5315
10 Locked 35.779911 69 5597
11 Locked 35.595078 103 5841
13 Locked 35.595078 126 6289
14 Locked 35.779911 105 6435
15 Locked 35.779911 129 6780
16 Locked 35.779911 194 7720
17 Locked 35.779911 198 7925
18 Locked 35.595078 204 6603
19 Locked 35.595078 142 8676
20 Locked 35.595078 173 6745
21 Locked 35.595078 106 8149
22 Locked 35.779911 125 7037
23 Locked 35.595078 116 7114
24 Locked 35.595078 127 7148
25 Locked 35.595078 132 7370
26 Locked 35.595078 146 7105
27 Locked 35.595078 116 7537
28 Locked 35.595078 68 7515
29 Locked 35.083549 25 6218
30 Locked 35.083549 33 6399
31 Locked 35.595078 13 7009
32 Locked 35.595078 6 6966
33 Locked 35.779911 3 6916
34 Locked 35.595078 11 6914
35 Locked 35.083549 3 6862
36 Locked 35.595078 4022 8384
37 Locked 35.779911 3910 8357
38 Locked 35.779911 3582 8716
39 Locked 35.595078 1260 7517
40 Locked 35.779911 416 6790


3.1 Downstream channels
Channel Channel Width (MHz) FFT Type Number of Active Subcarriers Modulation (Active Profile) First Active Subcarrier (Hz)
41 96 4K 1880 QAM4096 728


3.1 Downstream channels
Channel ID Lock Status RxMER Data (dB) PLC Power (dBmV) Correcteds (Active Profile) Uncorrectables (Active Profile)
41 Locked 37 12.0 91784 0

[legacy1]

The hub could handle that high power but VM aims for under 10dBmV
are both attenuators listed as forward path?