On Mon, 2006-02-13 at 22:37 +1300, Mark Foster wrote:

> To Clarify, i've always understood Jetstream in NZ to be
> RA-ADSL (RADSL?) - Rate Adaptive, (Asyncronous) Digital Subscriber Line.
> Aka, the downstream rate is rate-adaptive based on the line capabilities.

That used to be the case but it is now incorrect.

Telecom has stated numerous times recently that they now have a copper
spectral management policy that syncs your line only up to the speed
that you have paid for + some ATM overhead. The motivation for this is
supposedly to reduce the amount of interference within the cable sheath
and hence increase the reach of the current ADSL technology.

It's a contentious issue as the way that Telecom chooses to do this is
very different to how other Telco's around the world are doing it.

This spectrum management issue was at the heart of their arguments as to
why they could not offer "full-rate" or "unconstrained" download rates
as TCL was requesting.

If you're interested in this further I suggest that you read up on the
material presented at the conference held on TCLs application where
Telecom laid out their methodology in detail. The info is available at:
http://www.comcom.govt.nz/IndustryRegulation/Telecommunications/Wholesale/WholesaleDeterminatons/telstraclearwholesalebitstreamserviceap.aspx#345

HTH to clarify things.

Cheers

-- 
Matt Brown
matt@mattb.net.nz
Mob +64 275 611 544 www.mattb.net.nz
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