[AusNOG] ADSL2+ line sync data

[Guy Ellis]

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:
>
> 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:
>
>
> 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
www.traverse.com.au
T: +61 3 9386 4435 M: +61 419 398 234

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