"John P. Looney" wrote:
>> On Wed, Mar 01, 2000 at 02:23:48PM +0000, Justin Mason mentioned:
> > Someone on ILUG mentioned that the Genesis thing sounds like VDSL (see
> > http://www.dsl.com/intro.html#22), which is very high bandwidth but
> with a
> > very short max cable length (3000 ft apparently). So it does exist --
> > maybe only in a lab somewhere -- but it is out there!
>> Yeah, but it's even more finicky than ADSL, it's little brother, which
> was pointed out, isn't going to work in many places in Ireland anyway.
With the quantity of fibre running under the surface of this country,
are you telling me that the majority of urban dwellers won't be within
300m of a fibre loop???
Anyway, even over that limit the degradation, while high as a percentile
of the maximum, still leaves you with loads of play room!!!
Here's an extract from the URL I provided earlier....
VDSL PROJECTED CAPABILITIES
While VDSLhas not achieved the degree of definition of ADSL, it
has advanced far enough to discuss realizable goals, beginning with data
and range. Downstream rates derive from submultiples of the SONET
and SDH canonical speed of 155.52 Mbps, namely 51.84 Mbps, 25.92
Mbps and 12.96 Mbps. Each rate has a corresponding target range:
12.96 - 13.8 Mbps 4500 ft 1500 meters
25.92 - 27.6 Mbps 3000 ft 1000 meters
51.84 - 55.2 Mbps 1000 ft 300 meters
Upstream rates under discussion fall into three general ranges:
1.6 - 2.3 Mbps
Equal to Downstream
Early versions of VDSL will almost certainly incorporate the
slower asymmetric rate. Higher upstream and symmetric configurations may
only be possible for very short lines.
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