Slow Speed on 1G connection

[KristofBeets]

Experiencing very slow speed on 1G connection, since my return from holidays.

Connected via ethernet so not a Wifi issue.

Upload seems fine, but downstream is very poor no matter what server I use for speedtest, also connectivity to work data center is very slow (others on Virgin Media service do not see this isssue).

Continued...

[KristofBeets]

Modem stats (Hub4):

Downstream tab

3.0 Downstream channels

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

26	338750000	1.9	40.4	QAM256	26
1	138750000	7.8	40.9	QAM256	1
2	146750000	7.6	40.9	QAM256	2
3	154750000	7.5	40.9	QAM256	3
4	162750000	7	40.9	QAM256	4
5	170750000	6.5	40.9	QAM256	5
6	178750000	6.3	40.9	QAM256	6
7	186750000	6.1	40.9	QAM256	7
8	194750000	5.9	40.9	QAM256	8
9	202750000	5.6	40.4	QAM256	9
10	210750000	5.2	40.9	QAM256	10
11	218750000	5	40.4	QAM256	11
12	226750000	4.7	40.9	QAM256	12
13	234750000	4.4	40.4	QAM256	13
14	242750000	4.3	40.4	QAM256	14
15	250750000	4.1	40.4	QAM256	15
16	258750000	4	40.4	QAM256	16
17	266750000	4.1	40.9	QAM256	17
18	274750000	4.1	40.4	QAM256	18
19	282750000	3.3	40.4	QAM256	19
20	290750000	2.9	40.9	QAM256	20
21	298750000	3.4	40.4	QAM256	21
22	306750000	3.5	40.4	QAM256	22
23	314750000	3.1	40.4	QAM256	23
24	322750000	2.2	40.4	QAM256	24
25	330750000	2.1	40.9	QAM256	25
27	346750000	2.2	40.9	QAM256	27
28	354750000	2.2	40.4	QAM256	28
29	362750000	2.1	40.9	QAM256	29
30	370750000	2	40.9	QAM256	30
31	378750000	1.9	40.9	QAM256	31

...

[KristofBeets]

3.0 Downstream channels

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

26	Locked	40.366287	16	0
1	Locked	40.946209	26	0
2	Locked	40.946209	4	0
3	Locked	40.946209	35639	0
4	Locked	40.946209	6	0
5	Locked	40.946209	32	0
6	Locked	40.946209	0	0
7	Locked	40.946209	35	0
8	Locked	40.946209	1	0
9	Locked	40.366287	21	0
10	Locked	40.946209	9	0
11	Locked	40.366287	0	0
12	Locked	40.946209	0	0
13	Locked	40.366287	0	0
14	Locked	40.366287	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	1261	0
20	Locked	40.946209	0	0
21	Locked	40.366287	0	0
22	Locked	40.366287	0	0
23	Locked	40.366287	0	0
24	Locked	40.366287	0	0
25	Locked	40.946209	0	0
27	Locked	40.946209	0	0
28	Locked	40.366287	0	0
29	Locked	40.946209	0	0
30	Locked	40.946209	0	0
31	Locked	40.946209	0	0

[KristofBeets]

3.1 Downstream channels

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

159

94

4K

1840

QAM4096

424

3.1 Downstream channels

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

159

Locked

42

0.8

1326769931

381

Upstream Tab

3.0 Upstream channels

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

1	60300000	36.5	5120 KSym/sec	64QAM	1
2	39400000	37.3	5120 KSym/sec	64QAM	4
3	46200000	37.3	5120 KSym/sec	64QAM	3
4	53700000	37.3	5120 KSym/sec	64QAM	2

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	1	0
4	US_TYPE_STDMA	0	0	0	0

Have tried different ethernet cables, have tried disconnecting devices, different times of day, hub reboot, etc.

Help ?

K-

[KristofBeets]

Speedtest without IP address - oops

K-

[KristofBeets]

So just keeps getting worse:

Upload fine, download horrific.

Thinkbroadband test:

Thanks,

K-

[KristofBeets]

Network log is some of these entries:

Fri 10/06/2022 13:38:50	6	CM-STATUS message sent. Event Type Code: 4; Chan ID: 1; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: N/A.;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
Fri 10/06/2022 14:12:42	5	Lost MDD Timeout;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
Fri 10/06/2022 14:12:43	6	CM-STATUS message sent. Event Type Code: 4; Chan ID: 1; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: N/A.;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
Sat 11/06/2022 09:46:47	5	Lost MDD Timeout;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
Sat 11/06/2022 09:46:47	6	CM-STATUS message sent. Event Type Code: 4; Chan ID: 1; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: N/A.;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
Sat 11/06/2022 10:56:49	5	Lost MDD Timeout;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
Sat 11/06/2022 10:56:50	6	CM-STATUS message sent. Event Type Code: 4; Chan ID: 1; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: N/A.;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
Sat 11/06/2022 16:43:11	5	Lost MDD Timeout;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;

[jbrennand]

Can you test it this way...
_____________________

Connect a 1GB enabled computer/laptop, with up to date drivers, via a NEW and working Cat5e/6a ethernet cable, directly to the Hub which you have put into “modem mode” (https://www.virginmedia.com/help/virgin-media-hub-modem-mode ). This ensures that NO other devices are connected

Test speeds at https://speedtest.samknows.com/ - try on 2 different browsers.

If they are still low – boot your device into Windows safe+networking mode - to disable any potentially interfering software - and try again.

There are many posts on here (I have a list of ~30!) where QoS software, unknown/flaky software, old network card drivers, corrupted browsers, bad cables or other connected devices are limiting speeds on tests.

If its still poor then do a 60 second pinhole reset on the Hub and try again

Report back what that gets.

[KristofBeets]

Thanks John, unfortunately none of this has really helped.

The various different connections, cables, I also tested my laptop at work via ethernet where it gives high speeds, so I do not think it is to do with my laptop nor cable(s).

Tried the hub reset, tried the speedtest on both Chrome and Edge and same results, about 10 down and 50 up, so upload is always fine, the download is very low versus the target.

May try some more over the weekend but something is wrong since all of this used to work fine before my holidays.

K-

[KristofBeets]

There is one new thing in the log, not sure if that matters:

Fri 17/06/2022 06:51:39

5

DBC-REQ Mismatch Between Calculated Value for P1.6hi Compared to CCAP Provided Value;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;