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flatley
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New SHUB3, terrible performance

Hello,

I'm told this is normal but thought I'd check here as well.

I set up my SHUB3 today going through the setup as instructed, I have connected the box to the PC via Ethernet and disabled the wireless connection via the control panel.

I've rebooted (everything). I've powered down and restarted (everything).

I should be getting a d/l speed of 100 mega bits (or as near to as VM can get it) but I'm struggling to get 4 or 5. A call to them said there is trouble in the area (utilisation?) and it will be until mid April before all the lines are upgraded.

I was also told it would take 24 hours for the SHUB to settle down.

Is this right?

The reason I ask is that, last night, on my old (really old) modem, I was cruising along at 20 mbits with no issue.

Would I be better off wireless? Or going into "modem mode" - not that I have any idea how to do that.

Power levels:

Downstream

Channel Frequency(Hz) Power
(dBmV) SNR
(dB) Modulation Channel ID
1 322750000 -0.5 35 256 qam 68
2 314750000 -0.7 34.3 256 qam 67
3 306750000 -0.2 34.4 256 qam 66
4 266750000 -0.4 34.3 256 qam 61
5 258750000 -0.5 33.3 256 qam 44
6 250750000 0 33.4 256 qam 43
7 242750000 0.4 33.4 256 qam 42
8 234750000 0.5 32.9 256 qam 41
9 298750000 0.2 33 256 qam 65
10 290750000 0.5 31.6 256 qam 64
11 282750000 0.5 32.4 256 qam 63
12 274750000 -0.2 34.3 256 qam 62

Upstream

Channel ID Frequency(Hz) Mode Power
(dBmV) Modulation Channel Bandwidth(Hz) Symbol Rate (ksps)
1 45800000 ATDMA 47.3 16 qam 6400000 5120
4 53700000 ATDMA 47.3 16 qam 6400000 5120
3 27400000 ATDMA 47.3 16 qam 6400000 5120

I've tried different Ethernet ports on both the HUB and PC.

Thanks for reading and look forward to replies.

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Dave_cq
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Re: New SHUB3, terrible performance


flatley wrote:

 

Power levels:

Downstream

Channel Frequency(Hz) Power
(dBmV) SNR
(dB) Modulation Channel ID
1 322750000 -0.5     35      256 qam 68
2 314750000 -0.7    34.3   256 qam 67
3 306750000 -0.2   34.4   256 qam 66
4 266750000 -0.4   34.3   256 qam 61
5 258750000 -0.5   33.3   256 qam 44
6 250750000 0      33.4    256 qam 43
7 242750000 0.4   33.4    256 qam 42
8 234750000 0.5   32.9    256 qam 41
9 298750000 0.2   33      256 qam 65
10 290750000 0.5 31.6    256 qam 64
11 282750000 0.5  32.4    256 qam 63
12 274750000 -0.2 34.3   256 qam 62


 

Hi flatley, loved your Riverdance   Smiley Wink

The problem with your data is the column of figures I have highlighted.  These are the SNR (Signal To Noise) ratio for each channel.  These should be at least 34.5db and as you can see they are out of spec.  In short, you have a nasty noisy connection.  You could try making sure that the connectors on the cable between the wall socket and the hub are tight.  Otherwise you will need to arrange an engineer's visit.

 

 

********* SuperHub 2ac - Asus rt-ac68u Router - Vivid 100Mbps **********

Electron

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Dave_cq
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Message 2 of 10
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Helpful Answer

Re: New SHUB3, terrible performance


flatley wrote:

 

Power levels:

Downstream

Channel Frequency(Hz) Power
(dBmV) SNR
(dB) Modulation Channel ID
1 322750000 -0.5     35      256 qam 68
2 314750000 -0.7    34.3   256 qam 67
3 306750000 -0.2   34.4   256 qam 66
4 266750000 -0.4   34.3   256 qam 61
5 258750000 -0.5   33.3   256 qam 44
6 250750000 0      33.4    256 qam 43
7 242750000 0.4   33.4    256 qam 42
8 234750000 0.5   32.9    256 qam 41
9 298750000 0.2   33      256 qam 65
10 290750000 0.5 31.6    256 qam 64
11 282750000 0.5  32.4    256 qam 63
12 274750000 -0.2 34.3   256 qam 62


 

Hi flatley, loved your Riverdance   Smiley Wink

The problem with your data is the column of figures I have highlighted.  These are the SNR (Signal To Noise) ratio for each channel.  These should be at least 34.5db and as you can see they are out of spec.  In short, you have a nasty noisy connection.  You could try making sure that the connectors on the cable between the wall socket and the hub are tight.  Otherwise you will need to arrange an engineer's visit.

 

 

********* SuperHub 2ac - Asus rt-ac68u Router - Vivid 100Mbps **********

Electron
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legacy1
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Re: New SHUB3, terrible performance

Your SNR are low that could be one reason but the hub 3 is terrible currently.

You can run cmd and
ping -n 200 194.168.4.100
to do a short test

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flatley
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Re: New SHUB3, terrible performance

Well there you go... I thought I had everything all nice and tight but I checked the coax to the wall... OK, needed a turn or two I thought. Surely that wouldn't help. Oh how wrong can you be sometimes?  Rebooted: d/l speeds just flew to 100 meg. Happy camper! THANK YOU!

Downstream bonded channels
Channel Frequency(Hz) Power
(dBmV) SNR
(dB) Modulation Channel ID
1 322750000 1.2 37.6 256 qam 68
2 314750000 1 37.6 256 qam 67
3 306750000 1.2 37.3 256 qam 66
4 266750000 1.2 37.6 256 qam 61
5 258750000 1 37.6 256 qam 44
6 250750000 1.2 37.6 256 qam 43
7 242750000 1.2 37.6 256 qam 42
8 234750000 1.5 37.3 256 qam 41
9 298750000 1.2 37.6 256 qam 65
10 290750000 1 37.6 256 qam 64
11 282750000 1.2 37.6 256 qam 63
12 274750000 1 37.6 256 qam 62

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Dave_cq
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Message 5 of 10
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Re: New SHUB3, terrible performance


flatley wrote:

Well there you go... I thought I had everything all nice and tight but I checked the coax to the wall... OK, needed a turn or two I thought. Surely that wouldn't help. Oh how wrong can you be sometimes?  Rebooted: d/l speeds just flew to 100 meg. Happy camper! THANK YOU!

Downstream bonded channels
Channel Frequency(Hz) Power
(dBmV) SNR
(dB) Modulation Channel ID
1 322750000 1.2 37.6 256 qam 68
2 314750000 1 37.6 256 qam 67
3 306750000 1.2 37.3 256 qam 66
4 266750000 1.2 37.6 256 qam 61
5 258750000 1 37.6 256 qam 44
6 250750000 1.2 37.6 256 qam 43
7 242750000 1.2 37.6 256 qam 42
8 234750000 1.5 37.3 256 qam 41
9 298750000 1.2 37.6 256 qam 65
10 290750000 1 37.6 256 qam 64
11 282750000 1.2 37.6 256 qam 63
12 274750000 1 37.6 256 qam 62


 

Well there you go, great result and a lovely healthy set of figures now.  The simple solutions are the best.  I think a single malt is in order ... cheers ...  Smiley Happy

 

 

********* SuperHub 2ac - Asus rt-ac68u Router - Vivid 100Mbps **********

Electron
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flatley
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Re: New SHUB3, terrible performance

How about some kudos? Done Smiley Wink

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Superuser
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Re: New SHUB3, terrible performance

Probably prefers the single malt Smiley Wink
~~~~~~~~~~~~~~~~~~~~~~~~~
All posts made are personal opinions as I do not work for VirginMedia.
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flatley
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Re: New SHUB3, terrible performance

Aaaannd now it's gone all pants again. Power levels, this time, are still good.

At first, it shows up as can't connect to the 'net and starts up the web page to troubleshoot. I click to run the diagnostic/resolution but that's an epic fail (did this yesterday too) and tells me to contact VM. Give it a minute and it connects but, this time, with a d/l speed of 1/10th of what I'm supposed to have. Engineer time?

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flatley
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Re: New SHUB3, terrible performance

Hmm... I've observed a somewhat curious behaviour.

I switch off all my kit when not in use. Completely power down.

If I then start it up, I see the stuff above - no connection, after a while connects with pants speed etc. However, once connected, if I then reboot just the PC, I get a great 100mbits back on d/l.

Does this then imply that the SHUB should be left on "standby" at all times?

I haven't yet tried modem mode - would this help?

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whyowhyowhy
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Re: New SHUB3, terrible performance

Virgin Media is not like BT and switching the Hub off doesn't (or shouldn't) make any difference to speeds.  

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