[AusNOG] ADSL2+ line sync data

[Guy Ellis]

According to Turnbull, bonding will be supported, but I'll conceed that 
this is not a residential service.
I think most a business premises have at least two copper pairs?

Vectoring will need to become mandatory at some point to reach the 
50Mbps target of the policy.

  - G.


On 13/09/2013 9:02 AM, Paul Brooks wrote:
> On 13/09/2013 7:08 AM, Guy Ellis 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.
> You can forget about pair bonding in the broader plan - I sincerely 
> doubt the budget or street cabinets will be big enough to build two 
> ports for every dwelling.
>
> My point was that - without vectoring - the VDSL2 chart would look 
> much the same.
>
> Sure the axis labels would change - distances to 5km become distances 
> to 800 metres, bandwidth tops out at 120 Mbps instead of 24 Mbps - but 
> the shape of the chart would look much the same. A negligable 
> proportion getting the full 'up to' speed, roughly 30% of people 
> getting speeds down to 50% of the "up to" limit, and a large hump 
> majority of people down the low end getting about 10 - 15 Mbps - 
> probably better than the ~4 Mbps they might get now with ADSL2, but 
> not really up to the new benchmark.
>
> That leaves vectoring as the major difference - which will make speeds 
> more predictable and push a lot more services to the right to higher 
> speeds, reduce the width of the fuzzy cloud in the second diagram, but 
> still won't deliver 50 Mbps further than about 750 metres.
>
>
> Anyway, back to the original topic  - I was looking for ADSL2+ data - 
> anyone?
>
>
>
>>
>> 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.
>>>
>>>
>>>
>>>
>>>
>>>
>>> _______________________________________________
>>> AusNOG mailing list
>>> AusNOG at lists.ausnog.net
>>> http://lists.ausnog.net/mailman/listinfo/ausnog
>>
>>
>> -- 
>> Guy Ellis
>> guy at traverse.com.au
>> www.traverse.com.au
>> T: +61 3 9386 4435 M: +61 419 398 234
>>
>>
>> _______________________________________________
>> AusNOG mailing list
>> AusNOG at lists.ausnog.net
>> http://lists.ausnog.net/mailman/listinfo/ausnog
>


-- 
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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