25 Jul
2004
25 Jul
'04
10:36 p.m.
Patrick Kaell a écrit :
Thank you. I worked with Siemens, Eltrona and Cegecom on those issue. I
know a bit about it. There are limitations to this beautifull scenario:
networks that are owned by cities, existing infrastructure, economical
feasibility. And the problem was already known in USA in 2000, so I
think they should have done what is required to fix this limitation, but
it appears to not be the case...
So where is the problem? This thread was discussed
long ago. You
return from vacation and reopen the discussion without new information
or answering real questions.
I don't reopen anything. This thread was originated from a simple
isolated e-mail giving a simple info that I will not repeat anymore.
It is written here:
http://www.coditel.lu/english/isp/ispproducts.htm
<quote>
Extra monthly volume :€ 10.00 / month for an additional 10 GB.
</quote>
Once again, I don't care about Cegecom. It is not a flat rate offer
neither a DSL provider and I don't live in their coverage. My e-mail was
about DSL ISPs.
head-end for
the city and surrounding areas. The same signal is thus
delivered to the 25000 homes connected. If you say 10% only of the
subscribers will apply for Internet services, and that 10% only will
be connected at the same time, it gives you 250 users sharing the
same bandwidth.
If the problem arises, the provides still can split the beast into
segments. House blocks may be the smallest entity. House blocks are
directly connected to the gray Coditel boxes you see outside. From
there they can use any technology they want (even fibre optics). ADSL on the other hand, is much less viable. The
electromagnetical
proprieties of a phone cable is miserable compared to a coax cable.
Yes, but every house has one already and non-shared one.
There is a limitation to the length of the cable, ie.
you house must
not be too far away from the service center.
Yes. More or less 6-8 Kms, depending on the bandwidth that needs to be
supported.
The wires (a phone wire does not deserve being called
cable) are
bundled together in big bundles under the street. Only a small
percentage of the wire bundle can support ADSL because of the high
frequency and the signal overlapping to other wires.
This is called crosstalk. I have indeed some concerns about this ans DSL
services. Do you have examples of countries where this problem limited
actually the delivery of DSL services ?
How good a Cable access works is only a matter of how
much a provider
has invested in his infrastructure. Ideally, every gray Cable box is
connected via fibre optics. A house is only 50-200m away from a gray
box and connected over a high quality coaxial cable.
I'm affraid it is not the current situation in Luxembourg.
A DSL user is connected using a poor copper wire,
bundled with
hundreds other copper wires (overlapping of signals) over a distance
of many kilometres.
I prefer having a reliable service at 256 Kb/s (or more) on my poor
copper cable than no service at all because I don't live in Coditel
coverage anyway.
--
Brent Frère
Private e-mail: Brent(a)BFrere.net
Postal address: 5, rue de Mamer
L-8280 Kehlen
Grand-Duchy of Luxembourg
European Union
Mobile: +352-021/29.05.98
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URL: http://BFrere.net