Virgin Media Community

[Declan_1242]

Recently upgraded from 650Mbps to Gig1 and experiencing a lot of issues still.

I have conducted speedtests everyday to check consistency and I never manage to end up with consistent results during Peak times and Offpeak times. Max speed i have reached is 1.2Gbps, but that was for a split second, immidately after the connection drops to 300Mbps as does every other test I perform on any device.

I have reset my router settings, both Hub4 and ASUS AC86u, I have tried removing Modem mode and trying only via the Hub4 and still get the same results. I then decided to replace my CAT 5E Ethernet with a brand new CAT 8.1 with the same results.

I have even gone as far as disabling QoS, DNS changes and changing buffer sizes on windows, with still the same results. 

I have put everything back to how it is on default settings, is there anything I am not doing that I should be?

I have noticed that dBmV levels seem extremely abnormal compared to other results and notice that uncorrectables is 600~ tho I believe this may not be an issue as ive only seen people say its only an issue in the thousands. As for the noise margin, im not too sure what the expected is. 

Posted all below! Let me know if you require anything else! Thanks!

[Declan_1242]

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

3.0 Downstream channels

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

25	330750000	-6.9	38.6	QAM256	25
1	138750000	1.7	40.9	QAM256	1
2	146750000	1.3	40.9	QAM256	2
3	154750000	1.2	40.9	QAM256	3
4	162750000	0.7	40.4	QAM256	4
5	170750000	0.3	40.9	QAM256	5
6	178750000	-0.2	40.4	QAM256	6
7	186750000	-0.6	40.4	QAM256	7
8	194750000	-1	40.9	QAM256	8
9	202750000	-1.4	40.9	QAM256	9
10	210750000	-1.6	40.9	QAM256	10
11	218750000	-2	40.9	QAM256	11
12	226750000	-2.1	40.4	QAM256	12
13	234750000	-2.4	40.4	QAM256	13
14	242750000	-2.7	40.9	QAM256	14
15	250750000	-2.9	40.4	QAM256	15
16	258750000	-2.9	40.4	QAM256	16
17	266750000	-3.6	40.9	QAM256	17
18	274750000	-4.1	40.4	QAM256	18
19	282750000	-4.2	40.4	QAM256	19
20	290750000	-4.2	40.4	QAM256	20
21	298750000	-4.3	40.4	QAM256	21
22	306750000	-5.1	40.4	QAM256	22
23	314750000	-5.9	38.6	QAM256	23
24	322750000	-6.7	38.6	QAM256	24
26	338750000	-7.4	38.6	QAM256	26
27	346750000	-7.6	38.6	QAM256	27
28	354750000	-8	37.6	QAM256	28
29	362750000	-8.3	37.6	QAM256	29
30	370750000	-8.6	37.6	QAM256	30
31	378750000	-9	37.6	QAM256	31

[Declan_1242]

3.0 Downstream channels

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

25	Locked	38.605377	0	0
1	Locked	40.946209	0	0
2	Locked	40.946209	0	0
3	Locked	40.946209	0	0
4	Locked	40.366287	0	0
5	Locked	40.946209	0	0
6	Locked	40.366287	0	0
7	Locked	40.366287	0	0
8	Locked	40.946209	0	0
9	Locked	40.946209	0	0
10	Locked	40.946209	0	0
11	Locked	40.946209	0	0
12	Locked	40.366287	0	0
13	Locked	40.366287	0	0
14	Locked	40.946209	0	0
15	Locked	40.366287	0	0
16	Locked	40.366287	0	0
17	Locked	40.946209	0	0
18	Locked	40.366287	0	0
19	Locked	40.366287	0	0
20	Locked	40.366287	0	0
21	Locked	40.366287	0	0
22	Locked	40.366287	0	0
23	Locked	38.605377	0	0
24	Locked	38.605377	0	0
26	Locked	38.605377	1	0
27	Locked	38.605377	0	0
28	Locked	37.636276	0	0
29	Locked	37.636276	0	0
30	Locked	37.636276	0	0
31	Locked	37.636276	0	0

[Declan_1242]

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

29

-21

1318106527

619

3.0 Upstream channels

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

1	39400000	42	5120 KSym/sec	64QAM	12
2	46200000	43	5120 KSym/sec	64QAM	11
3	53700000	44	5120 KSym/sec	64QAM	10
4	60300000	45	5120 KSym/sec	64QAM	9

3.0 Upstream channels

Channel Channel Type T1 Timeouts T2 Timeouts T3 Timeouts T4 Timeouts

1	US_TYPE_STDMA	0	0	0	0
2	US_TYPE_STDMA	0	0	0	0
3	US_TYPE_STDMA	0	0	0	0
4	US_TYPE_STDMA	0	0	0	0

Primary Downstream Service Flow

SFID	973
Max Traffic Rate	1200000450
Max Traffic Burst	42600
Min Traffic Rate	0

 

[jb66]

Looks like water in the taps outside, high end is away, what signal level is your 3.1 channel?

[Declan_1242]

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

29

-21

1318106527

619

[Declan_1242]

Posted Above

[jb66]

-21 LOL

Definitely need a tech

[Declan_1242]

Lol, sounds good. I guess I shall wait for them to check this post. Do you think this may be the root cause of the extreme instability with the inability to reach anywhere near minimum predicted speeds?

[carl_pearce]

---

@Declan_1242 wrote:

Lol, sounds good. I guess I shall wait for them to check this post. Do you think this may be the root cause of the extreme instability with the inability to reach anywhere near minimum predicted speeds?

---

Almost definitely the root cause.