[AusNOG] 700Mbps over copper pair...over 400 metres

[Julien Goodwin]

On 23/09/10 13:36, Matthew Moyle-Croft wrote:
> 
> On 23/09/2010, at 11:12 AM, Julien Goodwin wrote:
> 
>>
>> They claim they've addressed crosstalk to go from 100Mb (so presumably
>> VDSL2) to 175. Then they do bonding, so not really anything special.
>>
>> But I still wonder about crosstalk concerns, which was always the claim
>> as to why ADSL2 (and fast ADSL1) took so long to get approved, and why
>> VDSL (still?) hasn't.
> 
> VDSL2 hasn't been approved for deployment because of non-technical reasons which were dressed up as technical issues.   

_Gee that's never happened before_

>> I'm sure the DSL carriers here would know the actual (by way of TDR)
>> average pair length in use in Australia, and could probably show just
>> why this is or isn't worth pursuing.
> 
> 
> The "average" attenuation is sufficient that VDSL2 from the exchange, along with issues around interference mean it's not very practical.  VDSL2 is a "cabinet" technology - ie.  FTTN style of thing where you place the active equipment within 1km or so of a house.
Giving those of you with actual experience in getting this stuff
approved no real incentive to do so.

Might still be a nice option for inner-city / CBD exchanges for
buildings that aren't fibred (and may not be like ours and have
400-pairs running to the computer room from our dial-up days).