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<div class="moz-cite-prefix">Paul,<br>
<br>
In response to your challenge (Exercise for the reader - work out
how VDSL2 would be any different)...<br>
<br>
In contrast to the current ADSL2+ network, there are 3 big
differences with the proposed VDSL2 FTTN deployment - <br>
(i) shorter loop lengths (700-800m) <br>
(ii) vectoring (crosstalk--)<br>
(iii) bonding (speed++)<br>
<br>
While such a VDSL2 network is not as good as fibre, it's no where
near as bad as the current ADSL2+ network.<br>
Right now some poor folks are on 6km loop lengths, there's plenty
of crosstalk and getting bonding working is a challenge.<br>
<br>
Regards,<br>
- Guy.<br>
<br>
<br>
<br>
<br>
On 12/09/2013 12:17 PM, Paul Brooks wrote:<br>
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<blockquote cite="mid:52312456.90609@layer10.com.au" type="cite">
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A recent Ofcom (UK) report has a very interesting chart of ADSL2+
line speeds:<br>
<div class="moz-forward-container">
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<p class="MsoNormal"> Ofcom Infrastructure Report 2012
Update<br>
<a moz-do-not-send="true"
href="http://stakeholders.ofcom.org.uk/market-data-research/other/telecoms-research/broadband-speeds/infrastructure-report-2012/">http://stakeholders.ofcom.org.uk/market-data-research/other/telecoms-research/broadband-speeds/infrastructure-report-2012/</a><br>
<a moz-do-not-send="true"
href="http://stakeholders.ofcom.org.uk/binaries/research/telecoms-research/infrastructure-report/Infrastructure-report2012.pdf">http://stakeholders.ofcom.org.uk/binaries/research/telecoms-research/infrastructure-report/Infrastructure-report2012.pdf</a><br>
Figure 4 on page 11:<br>
<img id="_x0000_i1025"
src="cid:part3.03040307.07050500@traverse.com.au"
width="593" height="350" border="0"><br>
</p>
<p class="MsoNormal">This chart is effectively the result of
the ADSL line-sync/attenuation curve combined with the
increasing area of circles of increasing radius around the
exchange - and demonstrates very clearly why so many
people get low ADSL2+ line speeds.<br>
(Exercise for the reader - work out how VDSL2 would be any
different)<br>
<br>
</p>
Also scatter-plots of sync-speed with line-length, as per
Figure 8 from another UK report:<br>
<br>
<img src="cid:part4.02010504.05090509@traverse.com.au"
alt="" width="553" height="240"><br>
<p class="MsoNormal">Now every DSLAM network operator can
put together similar charts - but I'm not aware of any
stats for Australian networks, apart from the heat maps
put out by iiNet and the adsl2exchanges.com.au site, which
aren't quite what I'm looking for.<br>
</p>
<p class="MsoNormal">For all you DSLAM operators - I would
be very interested in putting together similar charts for
the Australian networks, to see how our copper loop
network varies from the UK network. If anyone is willing
to share data or statistics, I'm very interested in
pulling together similar Australian charts - on a
non-identified, aggregated, anonymised basis if you wish.<br>
Please contact me off-list - thanks.<br>
</p>
<p class="MsoNormal">Paul.<br>
</p>
<p class="MsoNormal"> <br>
<br>
</p>
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<br>
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<br>
<pre class="moz-signature" cols="72">--
Guy Ellis
<a class="moz-txt-link-abbreviated" href="mailto:guy@traverse.com.au">guy@traverse.com.au</a>
<a class="moz-txt-link-abbreviated" href="http://www.traverse.com.au">www.traverse.com.au</a>
T: +61 3 9386 4435 M: +61 419 398 234
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