Virgin Media Community

[IPFreely]

The modulation being reported is wrong as far as the entire channel goes so not worth worrying about. No idea where it's getting 8QAM from: could be a defect in the modems themselves. Other software seems to just report 'OFDMA' as the modulation in 3.1 returns.

Modulation profile changes per minislot if it can so very strange to display anything there. 

[gitty]

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@IPFreely wrote:

Modulation profile changes per minislot if it can so very strange to display anything there. 

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If the number is real, it could be the highest modulation used by a specific profile. 8-QAM is pretty low, though, even for profile 13.

[DigitalDonkey]

I had the scheduled work in my area yesterday. I have no gone from 50Mbps to 0.51Mbps upload speed, no 3.1 channels in config. Checked speed using the VM SamKnows real speed check built into the SuperHub 4. 

I cannot get into VMs status page (errors), but I feel the upgrade has gone wrong in my area.

Any ideas, Teams video calls for work now terrible?

[snozski]

I had maintaince this morning and I've gained a new upload channel

Upstream bonded channels

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

0	49600000	47.3	5120	QAM 64	1
1	43100000	46.8	5120	QAM 64	2
2	36600000	46.3	5120	QAM 64	3
3	30100000	46	5120	QAM 64	4
4	23600000	45.8	5120	QAM 64	5

No mention of docsis 3.1 channel though but hub 5 does not say if 3.0 or 3.1

[gitty]

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@snozski wrote:

No mention of docsis 3.1 channel though but hub 5 does not say if 3.0 or 3.1

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When you get it, it will probably show up in a separate table.

Some modems use the same table, but the symbol rate used by legacy channels is not valid for OFDMA, so that would be 0.

[lojelo5]

Bit late on the uptake with this but we had the update this morning (Warmsworth) Doncaster

3.0 Downstream channels
Channel	Frequency (Hz)	Power (dBmV)	SNR (dB)	Modulation	Channel ID
1	139000000	3.900002	38.605377	QAM256	1
2	147000000	3.700001	38.605377	QAM256	2
3	155000000	3.700001	38.605377	QAM256	3
4	163000000	3.299999	38.983261	QAM256	4
5	171000000	3.000000	38.983261	QAM256	5
6	179000000	3.000000	38.983261	QAM256	6
7	187000000	3.000000	38.983261	QAM256	7
8	195000000	2.799999	38.983261	QAM256	8
9	203000000	2.599998	38.605377	QAM256	9
10	211000000	2.500000	38.983261	QAM256	10
11	219000000	2.400002	38.983261	QAM256	11
12	227000000	2.299999	38.605377	QAM256	12
13	235000000	2.099998	38.605377	QAM256	13
14	243000000	1.900002	38.605377	QAM256	14
15	251000000	1.799999	38.605377	QAM256	15
16	259000000	1.799999	38.983261	QAM256	16
17	267000000	2.000000	38.983261	QAM256	17
18	275000000	2.000000	38.983261	QAM256	18
19	283000000	1.900002	38.983261	QAM256	19
20	291000000	1.799999	38.605377	QAM256	20
21	299000000	1.799999	38.983261	QAM256	21
22	307000000	2.000000	38.983261	QAM256	22
23	315000000	1.900002	38.605377	QAM256	23
24	323000000	1.799999	38.983261	QAM256	24
25	331000000	1.700001	38.605377	QAM256	25
26	339000000	1.599998	38.983261	QAM256	26
27	347000000	1.700001	38.983261	QAM256	27
28	355000000	1.900002	38.983261	QAM256	28
29	363000000	1.500000	38.983261	QAM256	29
30	371000000	1.200001	38.983261	QAM256	30
31	379000000	1.000000	38.605377	QAM256	31


3.0 Downstream channels
Channel	Lock Status	RxMER (dB)	Pre RS Errors	Post RS Errors
1	Locked	38.605377	0	0
2	Locked	38.605377	0	0
3	Locked	38.605377	0	0
4	Locked	38.983261	0	0
5	Locked	38.983261	0	0
6	Locked	38.983261	0	0
7	Locked	38.983261	0	0
8	Locked	38.983261	0	0
9	Locked	38.605377	0	0
10	Locked	38.983261	0	0
11	Locked	38.983261	0	0
12	Locked	38.605377	0	0
13	Locked	38.605377	0	0
14	Locked	38.605377	0	0
15	Locked	38.605377	0	0
16	Locked	38.983261	0	0
17	Locked	38.983261	0	0
18	Locked	38.983261	0	0
19	Locked	38.983261	0	0
20	Locked	38.605377	0	0
21	Locked	38.983261	0	0
22	Locked	38.983261	0	0
23	Locked	38.605377	0	0
24	Locked	38.983261	0	0
25	Locked	38.605377	0	0
26	Locked	38.983261	0	0
27	Locked	38.983261	0	0
28	Locked	38.983261	0	0
29	Locked	38.983261	0	0
30	Locked	38.983261	0	0
31	Locked	38.605377	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	QAM4096	759


3.1 Downstream channels
Channel ID	Lock Status	RxMER Data (dB)	PLC Power (dBmV)	Correcteds (Active Profile)	Uncorrectables (Active Profile)
159	Locked	43	0.0	91199334	0

3.0 Upstream channels
Channel	Frequency (Hz)	Power (dBmV)	Symbol Rate (ksps)	Modulation	Channel ID
1	36600000	49.520599	5120 KSym/sec	64QAM	3
2	23600000	48.270599	5120 KSym/sec	64QAM	5
3	30100000	48.520599	5120 KSym/sec	64QAM	4
4	43100000	49.770599	5120 KSym/sec	64QAM	2
5	49600000	50.020599	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	1	0
2	US_TYPE_STDMA	0	0	1	0
3	US_TYPE_STDMA	0	0	0	0
4	US_TYPE_STDMA	0	0	2	0
5	US_TYPE_STDMA	0	0	0	0


3.1 Upstream channels
Channel	Channel Width (MHz)	Power (dBmV)	FFT Type	Modulation
6	10.0	44.5	2K	QAM8


3.1 Upstream channels
Channel	Channel Type	Number of Active Subcarriers	First Active Subcarrier (Hz)	T3 Timeouts	T4 Timeouts
6	OFDMA	200	53.9	2	0

I've seen no difference in speeds (touches wood) I have had a really good connection for quite some time, would be happy with faster upload speed.

[IPFreely]

Perhaps first quarter of next year. 

[cozmic1988]

 QAM128 now in RH10 area 

[snozski]

Cool cozmic1988

Thanks for sharing.  I wonder if faster upload speeds coming soon then 🙂  Can but hope

[Roger_Gooner]

VM will only market a higher upload speed, let's say 80Mbps on Gig1 for the sake of argument, if both the HFC and FTTP networks support this speed, but let's remember that VM is migrating to XGS-PON (meaning that some DOCSIS 3.1 upload area upgrades are not worth doing).