[MUD_Wizard]

Originally Posted by beardsley

Hi. I upgraded to Homeworker+ 300Mbit and yesterday received a shiny new Hub 3 (surprising black rather than the white I expected). I connected last night and after a few reboots if seemed to be working.

Those will be installing the initial firmware updates.

Originally Posted by beardsley

I did a speedtest and all looked great.

Yes the Hub 3 works great in router mode, even with the slightly spikey BQM.

Here's mine for comparison (router mode):

Originally Posted by beardsley

Then I switched it to modem mode and the fun started. Over the next couple of hours, if would keep dropping the connection and I had to give it a series of reboots. Eventually it seemed to settle down and is now maintaining the connection.

You should post your network log, so we can see what's what.

Originally Posted by beardsley

However the graph from thinkbroadband Broadband Quality Meter look pretty dire.



You can see the red bar where I swapped from the existing Shub 2ac to the Hub3.

Your BQM graph looks fairly average for a Hub 3, excluding the red packet loss events (which may or may not be explained by the combination of firmware updates in the first few hours, events in the network log and your reboots).

The slight increase in minimum latency (green) and increased thickness of the blue average latency will be due to the additional 8 channels of downstream you have locked.

Each 256 QAM downstream channel incurs 0.32 ms of additional latency per channel due to interleave. See the table at the bottom of this link:
http://www.kitz.co.uk/adsl/interleav...g_introduction

16 downstream channels locked (as you have) means a total of 5.12ms due to interleave instead of 2.56ms, when you only have 8 channels locked.

Since the BQM only plots every 100 seconds a single spike within that time is enough to produce the yellow spikes you see. I think those are maintenance tasks and data being transferred. The SH2ac also experiences similar yellow spikes in router mode (I have one running on the same line as my Hub 3), though not as often and not as high.

Where hub 3 users only have 8 or 12 channels locked their BQM graph has less yellow spikes and less thickness of blue.

Hope that helps in some way to understand what you're seeing.

The blue spikes on the graph look like times when data is being transferred?

Originally Posted by beardsley

It struck me as strange that 'Network Access' was listed as disabled, but I assume that if this was a problem, it would not be working at all.

Correct. It's a known issue in the GUI which is fixed in firmware 9.1.88T, so you must have been on 9.1.88J5 at that point. Your firmware may have updated again since then?

Originally Posted by beardsley

Also Upstream power levels are higher than I expected, but I thing are still within spec?

Anything in the 40's is perfect. Though keep an eye on them as that could be the reason for your disconnects (assuming it's not you rebooting your hub)?

---------- Post added at 21:24 ---------- Previous post was at 21:06 ----------

Originally Posted by General Maximus

Unfortunately you are royally screwed now. There is a known fault with shub3 in modem mode where it will disconnect every ~30 mins and you will lose your internet connection. Vm are aware of it but don't seem to be doing anything about it;

That's only IF he is on an Arris CMTS (which he can check by looking up the CMTS MAC in his network log).

If he's on a Cisco CMTS then the Hub 3 will work fine, even in modem mode.

Even if this user does experience port flapping while in modem mode (not everyone on an Arris CMTS does and not all the time) then he can apply in this thread to get a push of the latest firmware 9.1.116V, which VM believes fixes the issue:

http://community.virginmedia.com/t5/...187183#M113286

http://community.virginmedia.com/t5/...188961#M113510

In the mean-time, if necessary, he can run his hub in router mode.

Though we haven't established what his issues are at the point.