Virgin Media Community

[farske]

Hiya

I updated 2 months ago to the superfast 1GB speed, and got the upgraded hub 4.

I use Router Modem Mode to -> Archer C7 -> Wired to PC.

I have a few connected devices and WAPs but my testing and troubleshooting is done from my main PC.

I have a mixture of Cat 5e and Cat 6 cables so they shouldn't influence any speed issues.

I upgrade to 1Gig so I'm wondering why I pay more for less performance.

My speed tests before were often nearer the top range of my last package, but now it fluctuates and seems to be even slower at times and I'm wondering if it has some other setting issue.

It seems on average to be the old sped, or slower.

I've seen some success, but the posts result in PMs and solutions, so I'm holding out hope!

Thanks!

All info requested from the main community page below:

Info from Hub 4 Status.

Cable Modem StatusItem Status CommentsChannel Overview Downstream Upstream

Cable Modem Status	Online	DOCSIS 3.1
Primary downstream channel	Locked	SC-QAM
DOCSIS 3.0 channels	31	4
DOCSIS 3.1 channels	1	0

Primary Downstream Service Flow

SFID	89692
Max Traffic Rate	1200000450
Max Traffic Burst	42600
Min Traffic Rate	0

Primary Upstream Service Flow

SFID	89691
Max Traffic Rate	55000270
Max Traffic Burst	42600
Min Traffic Rate	0
Max Concatenated Burst	42600
Scheduling Type	bestEffort

See next post reply.

[farske]

Downstream

3.0 Downstream channels

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

25	331000000	9.000000	36.609653	QAM256	25
1	139000000	6.300003	34.925610	QAM256	1
2	147000000	6.199997	34.925610	QAM256	2
3	155000000	6.400002	35.779911	QAM256	3
4	163000000	6.699997	35.595078	QAM256	4
5	171000000	6.900002	35.779911	QAM256	5
6	179000000	7.099998	35.595078	QAM256	6
7	187000000	7.300003	35.779911	QAM256	7
8	195000000	7.300003	35.779911	QAM256	8
9	203000000	7.199997	35.779911	QAM256	9
10	211000000	7.400002	36.386890	QAM256	10
11	219000000	7.599998	36.386890	QAM256	11
12	227000000	7.599998	36.609653	QAM256	12
13	235000000	7.500000	35.595078	QAM256	13
14	243000000	7.300003	35.595078	QAM256	14
15	251000000	7.300003	35.083549	QAM256	15
16	259000000	7.800003	35.083549	QAM256	16
17	267000000	7.900002	35.779911	QAM256	17
18	275000000	7.900002	35.595078	QAM256	18
19	283000000	7.400002	35.595078	QAM256	19
20	291000000	7.599998	35.083549	QAM256	20
21	299000000	9.500000	36.386890	QAM256	21
22	307000000	10.000000	36.609653	QAM256	22
23	315000000	9.500000	36.386890	QAM256	23
24	323000000	9.300003	36.609653	QAM256	24
26	339000000	9.199997	36.386890	QAM256	26
27	347000000	9.699997	37.355988	QAM256	27
28	355000000	9.500000	36.386890	QAM256	28
29	363000000	9.300003	35.779911	QAM256	29
30	371000000	9.699997	36.609653	QAM256	30
31	379000000	9.599998	36.386890	QAM256	31

3.0 Downstream channels

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

25	Locked	36.609653	195917	0
1	Locked	34.925610	726267	0
2	Locked	34.925610	706709	0
3	Locked	35.779911	685723	0
4	Locked	35.595078	522946	0
5	Locked	35.779911	426096	0
6	Locked	35.595078	404698	0
7	Locked	35.779911	353549	0
8	Locked	35.779911	340606	0
9	Locked	35.779911	362172	0
10	Locked	36.386890	325640	0
11	Locked	36.386890	276799	0
12	Locked	36.609653	289136	0
13	Locked	35.595078	410141	0
14	Locked	35.595078	485416	0
15	Locked	35.083549	514554	0
16	Locked	35.083549	531884	0
17	Locked	35.779911	436898	0
18	Locked	35.595078	398101	0
19	Locked	35.595078	596552	0
20	Locked	35.083549	654935	0
21	Locked	36.386890	208806	0
22	Locked	36.609653	138645	0
23	Locked	36.386890	184933	0
24	Locked	36.609653	178967	0
26	Locked	36.386890	176686	0
27	Locked	37.355988	120333	0
28	Locked	36.386890	150030	0
29	Locked	35.779911	216512	0
30	Locked	36.609653	182866	0
31	Locked	36.386890	199722	0

3.1 Downstream channels

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

33

96

4K

1880

QAM4096

424

3.1 Downstream channels

Channel ID Lock Status RxMER Data (dB) PLC Power (dBmV) Correcteds (Active Profile) Uncorrectables (Active Profile)

33

Locked

38

10.3

1251279755

501145

[farske]

CONFIG

General Configuration

Network access	true
Maximum Number of CPEs	1
Baseline Privacy	true
DOCSIS Mode	3.1
Config file	cmreg-vmdg640-bbt076+voc-b.cm

UPSTREAM

Refresh data

3.0 Upstream channels

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

1	60300000	45.020599	5120 KSym/sec	64QAM	1
2	39400000	44.020599	5120 KSym/sec	64QAM	4
3	53700000	44.520599	5120 KSym/sec	64QAM	2
4	46200000	44.270599	5120 KSym/sec	64QAM	3

3.0 Upstream channels

Channel Channel Type T1 Timeouts T2 Timeouts T3 Timeouts T4 Timeouts

1	US_TYPE_STDMA	0	0	5	0
2	US_TYPE_STDMA	0	0	10	0
3	US_TYPE_STDMA	0	0	7	0
4	US_TYPE_STDMA	0	0	11	0

Network Log (I did try resetting it with the tool prior to this post)

Network Log

Time Priority Description

Mon Jan 31 10:20:43 2022	3	SYNC Timing Synchronization failure - Loss of Sync;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
Mon Jan 31 10:20:48 2022	5	Lost MDD Timeout;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;

[carl_pearce · Accepted solution]

---

@farske wrote:

Downstream

3.0 Downstream channels

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

25	331000000	9.000000	36.609653	QAM256	25
1	139000000	6.300003	34.925610	QAM256	1
2	147000000	6.199997	34.925610	QAM256	2
3	155000000	6.400002	35.779911	QAM256	3
4	163000000	6.699997	35.595078	QAM256	4
5	171000000	6.900002	35.779911	QAM256	5
6	179000000	7.099998	35.595078	QAM256	6
7	187000000	7.300003	35.779911	QAM256	7
8	195000000	7.300003	35.779911	QAM256	8
9	203000000	7.199997	35.779911	QAM256	9
10	211000000	7.400002	36.386890	QAM256	10
11	219000000	7.599998	36.386890	QAM256	11
12	227000000	7.599998	36.609653	QAM256	12
13	235000000	7.500000	35.595078	QAM256	13
14	243000000	7.300003	35.595078	QAM256	14
15	251000000	7.300003	35.083549	QAM256	15
16	259000000	7.800003	35.083549	QAM256	16
17	267000000	7.900002	35.779911	QAM256	17
18	275000000	7.900002	35.595078	QAM256	18
19	283000000	7.400002	35.595078	QAM256	19
20	291000000	7.599998	35.083549	QAM256	20
21	299000000	9.500000	36.386890	QAM256	21
22	307000000	10.000000	36.609653	QAM256	22
23	315000000	9.500000	36.386890	QAM256	23
24	323000000	9.300003	36.609653	QAM256	24
26	339000000	9.199997	36.386890	QAM256	26
27	347000000	9.699997	37.355988	QAM256	27
28	355000000	9.500000	36.386890	QAM256	28
29	363000000	9.300003	35.779911	QAM256	29
30	371000000	9.699997	36.609653	QAM256	30
31	379000000	9.599998	36.386890	QAM256	31

3.0 Downstream channels

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

25	Locked	36.609653	195917	0
1	Locked	34.925610	726267	0
2	Locked	34.925610	706709	0
3	Locked	35.779911	685723	0
4	Locked	35.595078	522946	0
5	Locked	35.779911	426096	0
6	Locked	35.595078	404698	0
7	Locked	35.779911	353549	0
8	Locked	35.779911	340606	0
9	Locked	35.779911	362172	0
10	Locked	36.386890	325640	0
11	Locked	36.386890	276799	0
12	Locked	36.609653	289136	0
13	Locked	35.595078	410141	0
14	Locked	35.595078	485416	0
15	Locked	35.083549	514554	0
16	Locked	35.083549	531884	0
17	Locked	35.779911	436898	0
18	Locked	35.595078	398101	0
19	Locked	35.595078	596552	0
20	Locked	35.083549	654935	0
21	Locked	36.386890	208806	0
22	Locked	36.609653	138645	0
23	Locked	36.386890	184933	0
24	Locked	36.609653	178967	0
26	Locked	36.386890	176686	0
27	Locked	37.355988	120333	0
28	Locked	36.386890	150030	0
29	Locked	35.779911	216512	0
30	Locked	36.609653	182866	0
31	Locked	36.386890	199722	0

3.1 Downstream channels

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

33

96

4K

1880

QAM4096

424

3.1 Downstream channels

Channel ID Lock Status RxMER Data (dB) PLC Power (dBmV) Correcteds (Active Profile) Uncorrectables (Active Profile)

33

Locked

38

10.3

1251279755

501145

---

Your downstream power levels are high, the DOCSIS 3.1 channel is technically out of spec (-6 to +10 in spec, 0bB being optimal)

The other concern is the Uncorrectables, highlighted, which you shouln't have any at all.

SNR is all over the place also.

Plenty of T3 timeouts also.

Looks like a noisy line.

One thing you can check is to ensure QOS isn't enabled on your Archer as it could be limiting the speed based on your old connection speed.

[farske]

Hi Carl,
Thanks for taking the time to look into it and highlight some issues.

I'll double-check QOM now.

Is there anything else I can amend here, or is this going to be down to VM?

[carl_pearce]

---

@farske wrote:
Hi Carl,
Thanks for taking the time to look into it and highlight some issues.

I'll double-check QOM now.

Is there anything else I can amend here, or is this going to be down to VM?

---

VM will need to arrange an engineer visit to check over your connection.

[farske]

Will I be Pm'd and contacted and arranged based off this post do you think?
I cant imagine trying to ring and book an engineer.

[carl_pearce]

---

@farske wrote:
Will I be Pm'd and contacted and arranged based off this post do you think?
I cant imagine trying to ring and book an engineer.

---

VM will reply to this thread, however it can take a few days to a week.

[m00g]

...and then around another week for the actual appointment.

[farske]

Haha, oh my.

Ok,maybe I'll get lucky 😄