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Australian researcher uses maths to reduce crosstalk effects
Friday 26 October 2007 07:30:19 by Andrew Ferguson

250Meg broadband is the headline speed that is emerging from Australia. Dr John Papandriopoulos of Melbourne University has apparently managed to squeeze more capacity out of the standard copper telephone network by using algorithms that eliminate much of the interference.

There is not much more detail than can be found in the article on MacUser at present, due to the small matter of a pending patent application.

It seems the 250Mbps figure is the absolute maximum attainable, however a more realistic figure of 100Mbps is likely using the system. When you consider VDSL2 can already deliver 100Mbps at loop lengths of 0.5km and managing 50Mbps at 1km, it sounds less impressive. The 1km figure is very important as almost all phone lines are shorter than this when just the cable between the premises and street cabinet is considered. These new algorithms cannot change the physics that mean the signal travelling down the copper wire gets smaller the further it travels, but it can help us to get more from the little signal that does make it through.

The current copper twisted pair telephone networks have been in place in many countries for many decades and are all past their sell by date, but technology keeps finding ways to squeeze more out of them. The real question is when will companies like BT take the big leap and embrace fibre on a large scale to give them a local loop that will survive to the next century.

Comments

Posted by muymalestado over 9 years ago
"The real question is when will companies like BT take the big leap and embrace fibre on a large scale to give them a local loop that will survive to the next century."

Keep saying it - we will get it one day.
Posted by CARPETBURN over 9 years ago
quote"The real question is when will companies like BT take the big leap and embrace fibre on a large scale to give them a local loop that will survive to the next century."
Im sorry... 'next century' are you assuming they will get the job done this century then?
Posted by Dawn_Falcon over 9 years ago
Well, Dr John Papandriopoulos, let's see the commercial product please.
Posted by CARPETBURN over 9 years ago
To be fair Dawn the bloke would be crackers to do that. I dunno what the telco industry is like over there but here i imagine if suddenly a serviced appear with his algorithms that eliminate much of the interference, every other bugger would just nick the idea. Especially the bigger ISPs, some id even go as far to say would claim it as there own and slap some stupid new name on it.
Posted by 2doorsbob over 9 years ago
i personaly embrace any idea using a single copper line to get better/higher speed as i believe it will be the only way we will be able to anything out of bt ..i feel they have hidden behind 21cn and when customers see there services do not improve and infact there new adsl+2 service will not make any differance if you live 4k or more away with an estate full of aliminium
Posted by 2doorsbob over 9 years ago
and adsl+2 is not new its been offered by the likes of easynet and be for sometime..people will start looking elsewhere ..the minute you can get hsdpa with a good download allowance @ 7.2meg and voip i'm off
Posted by Dawn_Falcon over 9 years ago
Carpet, I've seen this sort of idea before and until it's a product it's vapourware
Posted by kensand over 9 years ago
quote"The real question is when will companies like BT take the big leap and embrace fibre on a large scale to give them a local loop that will survive to the next century."
Brockhall Village in Lancashire is already served by fibre - but although this provides telephone service, broadband is not available and they have no indication when the necessary equipment will be provided.
Posted by CARPETBURN over 9 years ago
Oh i agree dawn_falcon, there has been plenty of claims of huge speed increases with just minor fiddling in the past which are pipedreams and hot air. I was just saying if its actually possible and works the bloke would be insane to just shove it straight out there cos others would pinch the idea/technology in seconds.
Posted by muymalestado over 9 years ago
kensand says "Brockhall Village in Lancashire is already served by fibre - but ....". The question is whether this exercise was too expensive to replicate across Britain. If they don't proceed to the next step and show there is revenue in fibre how will anyone be persuaded to fibre us all up?
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