Virgin Media Community

[CallumMack]

I have noticed that in my superhub 4 page the above field is increasing really quickly. 

System was rebooted about 30 minutes ago and we have nearly 10 million of these so far:

Details below:

3.0 Downstream channels

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

25	331000000	0	37.4	QAM256	25
1	139000000	2.9	37.6	QAM256	1
2	147000000	2.6	37.4	QAM256	2
3	155000000	2.6	37.4	QAM256	3
4	163000000	2.2	37.6	QAM256	4
5	171000000	1.9	37.6	QAM256	5
6	179000000	1.8	37.6	QAM256	6
7	187000000	1.6	37.4	QAM256	7
8	195000000	1.4	37.6	QAM256	8
9	203000000	1	37.6	QAM256	9
10	211000000	0.6	37.6	QAM256	10
11	219000000	0.5	37.4	QAM256	11
12	227000000	0.3	37.6	QAM256	12
13	235000000	0.3	37.6	QAM256	13
14	243000000	0.3	37.4	QAM256	14
15	251000000	0.3	37.6	QAM256	15
16	259000000	0.4	37.4	QAM256	16
17	267000000	0.2	37.6	QAM256	17
18	275000000	0	37.6	QAM256	18
19	283000000	-0.6	37.4	QAM256	19
20	291000000	-0.9	37.6	QAM256	20
21	299000000	-0.8	37.4	QAM256	21
22	307000000	-0.5	37.6	QAM256	22
23	315000000	-0.2	37.6	QAM256	23
24	323000000	0.1	37.4	QAM256	24
26	371000000	-0.7	38.6	QAM256	26
27	379000000	-0.5	38.6	QAM256	27
28	387000000	-0.3	38.6	QAM256	28
29	395000000	-0.1	38.6	QAM256	29
30	403000000	0	39	QAM256	30
31	411000000	0.1	39	QAM256	31

3.0 Downstream channels

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

25	Locked	37.355988	0	0
1	Locked	37.636276	0	0
2	Locked	37.355988	0	0
3	Locked	37.355988	0	0
4	Locked	37.636276	0	0
5	Locked	37.636276	0	0
6	Locked	37.636276	0	0
7	Locked	37.355988	0	0
8	Locked	37.636276	0	0
9	Locked	37.636276	0	0
10	Locked	37.636276	0	0
11	Locked	37.355988	0	0
12	Locked	37.636276	0	0
13	Locked	37.636276	7	0
14	Locked	37.355988	0	0
15	Locked	37.636276	0	0
16	Locked	37.355988	7	0
17	Locked	37.636276	0	0
18	Locked	37.636276	0	0
19	Locked	37.355988	0	0
20	Locked	37.636276	0	0
21	Locked	37.355988	0	0
22	Locked	37.636276	0	0
23	Locked	37.636276	0	0
24	Locked	37.355988	0	0
26	Locked	38.605377	0	0
27	Locked	38.605377	0	0
28	Locked	38.605377	0	0
29	Locked	38.605377	0	0
30	Locked	38.983261	0	0
31	Locked	38.983261	0	0

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

33

80

4K

1560

QAM4096

424

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

33

Locked

40

0.3

7630805

0

I have the system in modem mode due to dropouts in router mode, but Virgin have advised on last comms that they don't see or are aware of any issues:

[lotharmat]

As far as I know, correcteds are corrupted (due to primarily noise) symbols in a DOCSIS connection that have been corrected by a Reed Solomon algorithm.

It is the uncorrectables that can be a problem.

Are you having any connection issues?

https://en.wikipedia.org/wiki/Reed%E2%80%93Solomon_error_correction

[gitty]

The OFDM channel uses LDPC to correct errors. It is much more powerful. The OFDM channel is expected (by design) to have many corrected codewords.

[Sofia_B]

Hi @CallumMack. 

Thanks for your post 🙂 

I'm sorry to hear this, are you having any connection issues due to the fast increase? 

How have things been since posting? 

Thanks,