120M : Uddingston upstream 3 channels?

[ccarmock]

Originally Posted by Ignitionnet

Most areas don't have it yet. It won't make a profound difference to performance in any event and correlating it with the extra upstream channel isn't appropriate, they're nothing to do with one another.

Purely out of interest - is there are correlation between an area going to 64QAM for upstream and running with more than 2 upstreams? Or are they being changed at different times?

[roughbeast]

Originally Posted by ccarmock

Purely out of interest - is there are correlation between an area going to 64QAM for upstream and running with more than 2 upstreams? Or are they being changed at different times?

Both my changes occurred some time in the last 6 weeks, i.e. from 2 to 3 channels and to the current software. This does not mean, of course, that they happened at exactly the same time, but during that period there has only been one ISP initiated reboot

[crazyronnie]

I've been on QAM64 for very a long time but no 3rd upstream for me. I'm in London NW9

[Martin_D]

Originally Posted by crazyronnie

I've been on QAM64 for very a long time but no 3rd upstream for me. I'm in London NW9

Same here

[Ignitionnet]

Originally Posted by Ignitionnet

Most areas don't have it yet. It won't make a profound difference to performance in any event and correlating it with the extra upstream channel isn't appropriate, they're nothing to do with one another.

Me and my big mouth.

They are actually related - modems on the new firmware on the same cable as those without may see 3 upstreams while their older firmware counterparts are on 2.

Note may not will and given there's essentially no upstream congestion right now it makes no difference to performance and isn't an indication of impending tier uplifts.

[Martin_D]

Originally Posted by Ignitionnet

Me and my big mouth.

They are actually related - modems on the new firmware on the same cable as those without may see 3 upstreams while their older firmware counterparts are on 2.

Note may not will and given there's essentially no upstream congestion right now it makes no difference to performance and isn't an indication of impending tier uplifts.

Any news on when the the new firmware will release on the ac hub ? Ignitionnet

[Martin_D]

Just setup my SH2 again and got 3 upstreams

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[Ignitionnet]

Whatever turns you on

[qasdfdsaq]

Originally Posted by Ignitionnet

there's essentially no upstream congestion right now

That makes a change... Wonder how long that will last!

[Ignitionnet]

Not really; there have been very few upstream issues since upstream bonding was released. Last time it was really broken was when VM were selling 100Mb/10Mb on single upstream channels.

[Martin_D]

Originally Posted by Ignitionnet

Whatever turns you on

[roughbeast]

Originally Posted by roughbeast

Both my changes occurred some time in the last 6 weeks, i.e. from 2 to 3 channels and to the current software. This does not mean, of course, that they happened at exactly the same time, but during that period there has only been one ISP initiated reboot

My three channels are 16QAM each. Is this indicative of anything?

[General Maximus]

it doesn't work like that dude. The modulation directly corresponds to bandwidth and the amount of data that can go over that channel (it is to do with the number of bits per symbol). To keep it nice and simple qam64 provides a 50% increase in bandwidth from qam16 so I think you are roughly looking at going from 20mbits/channel to 30mbits/channel.

If you are using three channels (on qam16) then it is 3x20mbits=60mbits. Using your example, adding the three channel modulations to make qam48 would give you far less than what you currently have access to. What you are missing out on is 3 x qam64 channels which is 3x30mbits/channel=90mbits potential bandwidth.

You haven't got anything to worry about being stuck on qam16, it has been the normal for the last couple of years. In order to achieve the higher modulations your (or VM's network) has got to be a far higher standard and there has got to be less noise. This is why we have seen upstream channels fall back to qpsk in the past; slower connections but more noise tolerant. What some users have already reported seeing is being moved to qam64, but as issues crop up with noise they temporarily fall back to qam16. Things are moving in the right direction and as the shubs re only capable of using 4 bonded upstream channels the way forward for VM is to change the modulation and try and squeeze as much juice out of it as they can.

[Ignitionnet]

Of course if there's no upstream congestion people are missing out on nothing regardless of the modulations and number of channels in use.

[RubberyDuck]

Doubt it makes any difference, but I have 4 Upstreams: