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View Full Version : Superhub Some help setting up Superhub


apb27
22-09-2011, 14:53
https://www.cableforum.co.uk/images/local/2011/09/18.png

My installation has been finished! (he called beforehand, arrived on time, he knew what he was doing so everything went well - 0 problems).

Just have a few questions about the modem

1. There is a 3db forward path attenuator attached to the modem - i know its to do with steadying the signal, but i heard that signals can
change overtime so i may not need it in the future. Does it have any adverse affects in regards to speed, downloads, gaming etc?

2. In the modem services page there are firewall features, passthroughs, multicast and flood detection enabled. Do i need these really?

3. Does everything look good down below?

https://www.cableforum.co.uk/images/local/2011/09/18.jpg

thenry
22-09-2011, 16:11
Your power levels are both a little high and a little low. down their high, the tech installed a 3db attenuator, imo he should of put in a 6. up is low, it might need looking at if your SH plays up.

http://www.cableforum.co.uk/board/34896851-post3.html

services > depending on what you do on the net? mines set as firewall and ip flood ticked, untick everything else.

also UPnP can be disabled too if you don't use it.

v0id
22-09-2011, 16:19
Are you having any problems with your connection?

If the answers "no" then leave it alone ;)

jb66
22-09-2011, 17:05
I would have put on a forward and reverse 10db attenuator but there the good side of unacceptable :)

apb27
22-09-2011, 20:08
Unfortnatley im getting some issues now, been disconnected once and speedtest shows about 15mb. Downloads from steam were running at 100kb.

The downstream power has increased to:

8.8 dBmV 8.4 dBmV 8.1 dBmV


Will someone need to come back out again or can they solve issues like this from their end? Everything was going so well lol, a bit too well

thenry
22-09-2011, 20:28
when you log into your SuperHub and go advanced settings does the first page, status page state your on R30? Software Version ??? DON'T POST YOUR MAC!!

your up level is low which needs looking at. a down level adjustment will be done via a tech or you can buy an attenuator from ebay.

---------- Post added at 19:28 ---------- Previous post was at 19:23 ----------

call vm 0800 052 0431 for support

apb27
22-09-2011, 20:32
my mac address is..... lol

https://www.cableforum.co.uk/images/local/2011/09/16.png


firmware is the newer r30

i'll give em a call and can hopefully get a tech to come
round and adjust it, shouldn't be a problem as i did just
get it installed today.

Sephiroth
22-09-2011, 20:51
Sorry to put some slightly conflicting advice your way - but here goes.

Your house would seem to be rather close to the street cabinet, which would account for the high DS power and low US. In these circumstances, your US power is fine.

Your DS power should come down, and it will rise further in winter as cable contracts and attenuation falls. IMO you would benefit from at leasta total of 10 dB forward path attenuation.

Alternatively, an engineer could move your tap to a higher overall attenuation point (as well as putting on a lower value FPA), and then your upstream power will rise accordingly.

BTW, you can buy a 10 dB FPA on ebay or wait for a VM engineer to come.

apb27
22-09-2011, 20:59
Just spoke to support and after a reset/channel switch speed did go back up to normal.

However they said that the power levels seemed fine, no need to worry unless its over 12 or 13.

I'll see it how goes tonight and tomorrow, otherwise i'll ask for someone to come and resolve it.

Thanks for the advice.

qasdfdsaq
23-09-2011, 10:19
However they said that the power levels seemed fine, no need to worry unless its over 12 or 13.
.
Support is regularly wrong on these matters.

Anything above +7 is sub-optimal (mine stops working for all intents and purposes at 7.5)

Sephiroth
23-09-2011, 10:39
Qas is 100% correct (FACT).

apb27
23-09-2011, 12:39
just checked it again today and levels have dropped to 8.3, 7.7 and 7.4 (although they still move up and down a bit).

speedtest showed 48 down and 4.7 up which is great, but the graph underneath when testing was very shaky with lots of ups and downs, was not a steady speed.

pingtest showed jitter as 6 which seems ok, gave the connection an A.


looks ok for now, but it looked ok yesterday for a few hours too. i'll see how it goes

Sephiroth
23-09-2011, 13:18
Those sort of level changes are normal on a day to day basis. In deep winter you'll find the downstream c. 3 dBmv higher and the upstream correspondingly lower.

A shaky graph might indicate some issue, but I would expect any power related cause to be reflected in events in the event log.

apb27
23-09-2011, 14:50
https://www.cableforum.co.uk/images/local/2011/09/17.jpg

its dropped back to about 30mb now, something is definitely up

Sephiroth
23-09-2011, 15:01
Any clues in the event log?

apb27
23-09-2011, 15:07
nothing at all, last entry was the reset that happened yesterday
Resetting the cable modem due to docsDevResetNow

another test showed 48mb now, but the graph is still shaky
https://www.cableforum.co.uk/images/local/2011/09/16.jpg

Sephiroth
23-09-2011, 15:32
Well, you do want to see a steady graph. I can't diagnose if the variation is due to network segment utilisation or the effects of high DS power. It won't set you back much to buy a Forward Path Attenuator on ebay.

apb27
23-09-2011, 15:33
i found an 8db fpa for 4.99, will order one before booking an engineer then
thank you

Sephiroth
23-09-2011, 16:09
Good move. Keep us posted.

RB2004
23-09-2011, 17:43
wouldnt listen to support.. take it with a pinch of salt.. and also some engineers.

Ive had long time ongoing signal problems, and have been repeatedly told i have signal problems.

Then after I had 100mbit installed and was told i had signal problems again I took matters into my own hands and persued the matter.

Ideal range is, -3 to +7 from what I gather.

with as near to 0 as being perfect apparently, although technically +2 should be considered perfect as it is slap bang in the middle of the range.

http://community.virginmedia.com/t5/Fibre-optic-broadband-cable/POWER-LEVELS-amp-SNR-A-TECHNICAL-PRIMER/td-p/148068

Seph has posted previously this article on the VM site :)

But from experience ive learned not to listen to engineers or support.

Support.. some of their 100mbit team sent me engineers and told me -6 was borderline and needed fixing, even criticised the first engineer for not doing more to resolve it... while others said they regularly see signal levels of that level and it is nothing to worry about.

Same with engineers, had 2 engineers who did nothing to increase my signal, 2nd even said nothing to worry about unless it goes down past -7 dBmV, but it is all rubbish.

In the end I reported a TV fault, and engineer number 3 called networks and got my signal sorted properly.. now im running around -1 to -2 which is within spec... and ive noticed my connection has stabilised and im even getting a faster speedtest result at times.

apb27
23-09-2011, 20:46
tonight everything seems fine, speedtest hit 50/4.8 and the graph was very steady

https://www.cableforum.co.uk/images/local/2011/09/11.png https://www.cableforum.co.uk/images/local/2011/09/12.jpg

downstream levels right now are at8.8/8.3/8.0

not really sure whats going on but hopefully the fpa can help
will keep you guys posted

jb66
24-09-2011, 08:17
Support is regularly wrong on these matters.

Anything above +7 is sub-optimal (mine stops working for all intents and purposes at 7.5)

Ive never seen this phenomenon, a hub seems to work the same with constant reboots no matter what the level is

Sephiroth
24-09-2011, 11:11
Ive never seen this phenomenon, a hub seems to work the same with constant reboots no matter what the level is

That simply means there is a masking fault up to the power level tipping point.

Ignitionnet
24-09-2011, 11:29
This thread amuses me on many levels :)