[LINK] Aussie Claims Copper Broadband now 200x Faster

[steve jenkin]

Bernard Robertson-Dunn wrote on 25/10/07 9:27 AM:

> Aussie Claims Copper Broadband now 200x Faster Posted by CmdrTaco on
> Wednesday October 24, @08:45AM from the alarms-going-off-in-brain
> dept. http://slashdot.org/articles/07/10/24/1228200.shtml
>
> SkiifGeek writes
>
> "Winner of Melbourne University's Chancellor's Prize for Excellence,
> Dr John Papandriopoulos could soon find himself the focus of a number
> of networking companies and government agencies interested in
> wringing more performance from existing network infrastructure.
> <snip>

I'm hoping this isn't a media beatup or restricted to some
simple/restricted application.

Whatever happened to the "bandwidth-distance product"?
That's due to the underlying physics... Just what has he come up with?
[this is why for 802.11, 100baseT goes *much* further than 1000baseT and
cable plant has had to go from cat-4 to cat-5/5e and now cat-6 ]

>From the mention of "cross-talk", I'm guessing he's come up with a new
modulation technique suitable for DSL over phonelines:
 - many carriers in the same bundle
 - lots of cross-talk
 - varying impedance and signal levels across the bundle

<http://www.corningcablesystems.com/web/news/dsprgall.nsf/ehtml/glossary>
Bandwidth-Distance Product
The information-carrying capacity of a transmission medium is normally
referred to in units of MHz·km. This is called the bandwidth-distance
product or, more commonly, bandwidth. The amount of information that can
be transmitted over any medium changes according to distance. The
relationship is not linear, however. A 500 MHz·km fiber does not
translate to 250 MHz for a 2 kilometer length or 1000 MHz for a 0.5
kilometer length. It is important, therefore, when comparing media, to
ensure that the same units of distance are being used.

-- 
Steve Jenkin, Info Tech, Systems and Design Specialist.
0412 786 915 (+61 412 786 915)
PO Box 48, Kippax ACT 2615, AUSTRALIA

sjenkin at canb.auug.org.au http://members.tip.net.au/~sjenkin