100M VMNG300 92Mbit limit - Page 4

General Maximus · 28-01-2012, 15:22

Quote:

Originally Posted by Sephiroth

If they were able to increase the QAM from 256 to 1024 then each channel could handle 69 Mbps. Igni points out that the infrastructure must be capable of handling the higher SNR required for 1024QAM to operate reliably.

There is a useful paper here. Please note that it refers to DOCSIS not EURODOCSIS; so the throughput quoted can be increased to 8/6 of the value quoted in the paper.

Where does the physical restriction come in as far as what the modem can handle? Could the vmng300 theoretically handle 1gbit as long as each of the 4 channels ran at something like 300mbit and it could handle the power requirements?

thenry · 28-01-2012, 15:22

I didn't read the original post, VMNG300

Sephiroth · 28-01-2012, 17:09

Quote:

Originally Posted by General Maximus

Where does the physical restriction come in as far as what the modem can handle? Could the vmng300 theoretically handle 1gbit as long as each of the 4 channels ran at something like 300mbit and it could handle the power requirements?

AFAIK, mon General,the VMNG300 only runs to 256QAM downstream, but goes up to 128QAM upstream.

Netgear do a 1024-QAM gateway, but I can't find it spec'd for the Broadcom 3380 chip in the SH.

General Maximus · 28-01-2012, 19:29

so are we looking at something like 96mbit up?

Andrewcrawford23 · 28-01-2012, 19:49

Quote:

Originally Posted by General Maximus

so are we looking at something like 96mbit up?

i think the max upstream channel rate is 16to24mb/s been a whiel since i looked at het spec for it but nto sure what qam taht would be with

Chrysalis · 28-01-2012, 20:29

4x qam64 upstream channels would yield around 120mbit of useable bandwidth I think.

Sephiroth · 28-01-2012, 20:36

That's right. But they've gotta get the SNR up in the plant.

craigj2k12 · 28-01-2012, 22:11

gone into a lot of detail here, about frequencies and modulation but I think the main point is that VM have clearly lied about this, the VMNG is clearly capable of way more than 92mb

why do they always lie about things? if they said they just didnt want it on the network, or they said they are using more d/s channels and the VMNG isnt capable of using them or something, but they lie and lie

Peter_ · 28-01-2012, 22:15

Quote:

Originally Posted by craigj2k12

gone into a lot of detail here, about frequencies and modulation but I think the main point is that VM have clearly lied about this, the VMNG is clearly capable of way more than 92mb

why do they always lie about things? if they said they just didnt want it on the network, or they said they are using more d/s channels and the VMNG isnt capable of using them or something, but they lie and lie

It is of little consequence either way as it is sadly up to Virgin Media how they want to run their network so even if you could prove otherwise they will do what they see as necessary to keep the network running as they want it.

General Maximus · 28-01-2012, 22:24

Quote:

Originally Posted by craigj2k12

but they lie and lie

because they like to make it sound like they are doing you a favour. You don't need to worry that your modem is outdated and slow, we are going to give you an amazing super fast superhub which is the best thing since sliced bread. How awesome are we?

Skie · 28-01-2012, 23:21

Quote:

Originally Posted by craigj2k12

but they lie and lie

Its called marketing. Virgin are full of marketing.

qasdfdsaq · 29-01-2012, 02:16

Quote:

Originally Posted by Peter_

It is of little consequence either way as it is sadly up to Virgin Media how they want to run their network so even if you could prove otherwise they will do what they see as necessary to keep the network running as they want it.

So it's OK for commercial companies to spout blatent lies as long as they give customers no choice in the matter (i.e. it's of no consequence)?

craigj2k12 · 29-01-2012, 02:33

Quote:

Originally Posted by Skie

Its called marketing. Virgin are full of marketing.

its not called marketing, fair enough they can "extend the truth" i.e. calling their network fibre optic. It is partially fibre in the same way that infinity is, but most people think that its completely fibre which is the extension of truth

we have established the VMNG is capable of 180mb in its current state (with limiting factors like firmware etc.) however virgin say there only capable of 92mb, which is no marketing plea, its downright lies

Peter_ · 29-01-2012, 08:04

Quote:

Originally Posted by qasdfdsaq

So it's OK for commercial companies to spout blatent lies as long as they give customers no choice in the matter (i.e. it's of no consequence)?

Not what I said though is it, they will look on it as a sound commercial decision that makes perfect sense as a company.

General Maximus · 29-01-2012, 09:44

Quote:

Originally Posted by Peter_

Not what I said though is it, they will look on it as a sound commercial decision that makes perfect sense as a company.

cool, it makes commercial sense then for Asda to tell everyone that Tesco's, Morrisons and Sainsburys are rubbish and we should al shop at asda because they have the lowest prices, best product quality and best product availability.

It makes sense for Asda to do it but it wouldn't last long because they would get their asses sued. (Morrisons sued them for a claim last year which they were unable to substantiate)