[AusNOG] Looks like the NBN will be a PON variant for sure...

[Narelle]

On Wed, Apr 29, 2009 at 8:28 AM, John Lindsay <jlindsay at internode.com.au>wrote:

>
> I think you can make a very strong argument that Layer 3 is "greener"
> which also means "cheaper to operate" on the basis of needing slightly
> less boxes.
>

Actually if you bridge on a larger scale you use fewer boxes, but imnsho
that design lacks so much I won't even start.





> HFC networks are often operated as Layer 3 with customers even being
> able to see their neighbours at Layer 2.
>

Only if you do it badly. The older stuff was all bridged and really poor
security wise. All the newer stuff is layer 3 and DOCSIS separates people
nicely via RF encoding.

You should really be able to see your neighbours, anyway. Why not use LANs
like they were meant to??



>
> ADSL networks are often operated as Layer 2 with all traffic
> encapsulated in PPP.
>

but these are circuits and the DSLAM does all the work.


> But IPTV is much easier and more efficient if it's Layer 3 and ADSL
> networks can do that too, even at the same time as encapsulating the
> Internet access.



loads of things are...


-- 


Narelle
on her soapbox and in a foul mood thanks to some useless airline

narellec at gmail.com
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