Hub5 intermittently drops from 1gb down to 1-5mb

[xpenno255]

Hi all,

My 1gig VM service has been working fine since it was installed and all of a sudden a few days ago I started to get somewhere around 1mb download, upload seems fine, about 4-5 times a day and only a reboot of the router fixes it. My setup ideally uses Modem mode but I've tested in router mode and it's happening in either mode.

I've been searching the forum today and noticed a lot of people using RealSpeed so I'm just waiting for it to happen again so I can run that (typically it's not happened since...)

I can't find a reference guide for expected power but after browsing a number of threads and seeing other peoples results I'm a bit worried that mine are looking low, but I'm not sure.

If someone could take a look and let me know then that would be great.

Cable Modem StatusItem Status TypeChannel Overview Downstream Upstream

Cable Modem Status	Online	DOCSIS 3.0
Primary downstream channel	Locked	SC-QAM
DOCSIS 3.0 channels	32	5
DOCSIS 3.1 channels	1	1

3.0 Downstream channels

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

1	331000000	-7.1	41	QAM 256	25
2	139000000	-2.2	43	QAM 256	1
3	147000000	-2.7	43	QAM 256	2
4	155000000	-2.8	43	QAM 256	3
5	163000000	-3.5	43	QAM 256	4
6	171000000	-3.6	43	QAM 256	5
7	179000000	-4.1	43	QAM 256	6
8	187000000	-4	43	QAM 256	7
9	195000000	-4.1	43	QAM 256	8
10	203000000	-4.4	43	QAM 256	9
11	211000000	-4.6	42	QAM 256	10
12	219000000	-5.1	42	QAM 256	11
13	227000000	-5.3	42	QAM 256	12
14	235000000	-6	42	QAM 256	13
15	243000000	-6.2	41	QAM 256	14
16	251000000	-7.1	40	QAM 256	15
17	259000000	-6.8	40	QAM 256	16
18	267000000	-6.5	40	QAM 256	17
19	275000000	-6.3	40	QAM 256	18
20	283000000	-6.3	40	QAM 256	19
21	291000000	-6.3	40	QAM 256	20
22	299000000	-6.6	40	QAM 256	21
23	307000000	-6.8	41	QAM 256	22
24	315000000	-6.8	41	QAM 256	23
25	323000000	-7	41	QAM 256	24
26	339000000	-7	41	QAM 256	26
27	347000000	-7.2	41	QAM 256	27
28	355000000	-7.8	40	QAM 256	28
29	363000000	-8	40	QAM 256	29
30	371000000	-8.7	40	QAM 256	30
31	379000000	-9	39	QAM 256	31
32	387000000	-9.2	39	QAM 256	32

3.0 Downstream channels

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

1	Locked	41	0	0
2	Locked	43	0	0
3	Locked	43	0	0
4	Locked	43	0	0
5	Locked	43	0	0
6	Locked	43	0	0
7	Locked	43	0	0
8	Locked	43	0	0
9	Locked	43	0	0
10	Locked	43	0	0
11	Locked	42	0	0
12	Locked	42	0	0
13	Locked	42	0	0
14	Locked	42	0	0
15	Locked	41	0	0
16	Locked	40	0	0
17	Locked	40	0	0
18	Locked	40	0	0
19	Locked	40	0	0
20	Locked	40	0	0
21	Locked	40	0	0
22	Locked	40	0	0
23	Locked	41	0	0
24	Locked	41	0	0
25	Locked	41	0	0
26	Locked	41	1	0
27	Locked	41	0	0
28	Locked	40	1	0
29	Locked	40	0	0
30	Locked	40	2	0
31	Locked	39	1	0
32	Locked	39	0	0

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

QAM 4096

1108

3.1 Downstream channels

Channel ID Locked Status RxMER Data (dB) PLC Power (dBmV) Corrected errors (Active Profile) Uncorrectable errors (Active Profile)

159

Locked

29

-20.3

327839747

44287653

3.0 Upstream channels

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

0	49600000	50.3	5120	QAM 64	1
1	43100000	48.8	5120	QAM 64	2
2	36600000	48.8	5120	QAM 64	3
3	30100000	47.8	5120	QAM 64	4
4	23600000	48.3	5120	QAM 64	5

3.0 Upstream channels

Channel Channel Type T1 Timeouts T2 Timeouts T3 Timeouts T4 Timeouts

0	ATDMA	0	0	0	0
1	ATDMA	0	0	0	0
2	ATDMA	0	0	3	0
3	ATDMA	0	0	0	0
4	ATDMA	0	0	0	0

3.1 Upstream channels

Channel Channel Width (MHz) Power (dBmV) FFT Type Modulation

6

10

44.2

2K

QAM 256

3.1 Upstream channels

Channel Channel Type Number of Active Subcarriers First Active Subcarrier (Hz) T3 Timeouts T4 Timeouts

6

OFDMA

200

74000000

0

0

Thanks

Spence

[legacy1]

setup a BQM

Broadband Quality Monitor | thinkbroadband

A amp might of failed giving you low power levels mainly on the 3.1 Downstream channel

[xpenno255]

Created, thanks

[xpenno255]

Ok, pretty much as soon as I setup the BQM test it happened again.... here's the RealSpeed output.

[xpenno255]

Here's a link to my BQM

<a title="Broadband Ping" href="https://www.thinkbroadband.com/broadband/monitoring/quality/share/5ae9d0d7f60a60820dcc35018500ccfd9e..."><img alt="My Broadband Ping - VM Home" src="https://www.thinkbroadband.com/broadband/monitoring/quality/share/5ae9d0d7f60a60820dcc35018500ccfd9e..." /></a>

[xpenno255]

Second attempt...

BQM Results 

[Client62]

Taken at face value the 3.0 Downstream signals are as much as 10 dB low
and the 3.1 Downstream signal is about 20 dB low.

Kind of very odd that the 3.0 Upstream signals are all connected at 64 QAM
and in an acceptable power range.

Check for known faults in your street  ( do use try both methods )

Call 0800 561 0061 – this is an automated number.

https://www.virginmedia.com/help/check/status/identification/identify

[xpenno255]

Thanks, I've checked both methods and there's nothing reported in my area.

[legacy1]

what the speed done here for x1 vs x6

UK Broadband Speed Test | thinkbroadband

also muiti vs single test here

Speedtest by Ookla - The Global Broadband Speed Test

[xpenno255]

Here are the requested results, note that these are all post the router being rebooted. I'll take another set when the issue reoccurs.

Here's the RealSpeed test post the Hub reboot for comparison also.