[AusNOG] ADSL2+ line sync data

[Beeson, Ayden]

However, the bandwidth drop is even more drastic on vdsl. At a distance of even 500 metres your average bandwidth is drastically lower then where it started.

http://nbnmyths.files.wordpress.com/2011/06/fttn-speed-graph.gif

Unfortunately, as you can see by the graph, you have to be less than 300 metres (poor copper condition not factored in) to get the promised 50mbit and at ~500 metres+ it's worse than adsl 2+ across the board.

Guy Ellis <guy at traverse.com.au> wrote:



Paul,

In response to your challenge (Exercise for the reader - work out how VDSL2 would be any different)...

In contrast to the current ADSL2+ network, there are 3 big differences with the proposed VDSL2 FTTN deployment -
(i) shorter loop lengths (700-800m)
(ii) vectoring (crosstalk--)
(iii) bonding (speed++)

While such a VDSL2 network is not as good as fibre, it's no where near as bad as the current ADSL2+ network.
Right now some poor folks are on 6km loop lengths, there's plenty of crosstalk and getting bonding working is a challenge.

Regards,
 - Guy.




On 12/09/2013 12:17 PM, Paul Brooks wrote:
A recent Ofcom (UK) report has a very interesting chart of ADSL2+ line speeds:
Ofcom Infrastructure Report 2012 Update
http://stakeholders.ofcom.org.uk/market-data-research/other/telecoms-research/broadband-speeds/infrastructure-report-2012/
http://stakeholders.ofcom.org.uk/binaries/research/telecoms-research/infrastructure-report/Infrastructure-report2012.pdf
Figure 4 on page 11:
[cid:part3.03040307.07050500 at traverse.com.au]
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.
(Exercise for the reader - work out how VDSL2 would be any different)

Also scatter-plots of sync-speed with line-length, as per Figure 8 from another UK report:

[cid:part4.02010504.05090509 at traverse.com.au]
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.
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.
Please contact me off-list - thanks.
Paul.






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--
Guy Ellis
guy at traverse.com.au<mailto:guy at traverse.com.au>
www.traverse.com.au<http://www.traverse.com.au>
T: +61 3 9386 4435 M: +61 419 398 234


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