[AusNOG] Why not Symmetric ingress and egress?

[Paul Brooks]

Stephen - the GPON technology they are considering has a natural 2:1 
ratio as part of the tech standard (2.5Gbps down, 1.25 Gbps up, shared 
amongst ~32 drops in the PON), which is one consideration - and  much 
better than the 20:1 ratio inherent in DSL - Hence the 100Mbps down, 50 
Mbps up plans. There is no technical reason why an RSP couldn't offer 
something like 50 Mbps symmetric though.

The next generation 10GPON has the same 2:1 ratio down:up.

Business plans are expected to be much more symmetric, as well as 
extending beyond 100Mbps to 1 Gbps as available customer link speeds on 
day 1.

NB Last I heard, the ONT is likely to have gigabit-capable ethernet 
ports - so expanding even residential accesses higher than 100 Mbps is 
likely to be little more than a provisioning exercise, once the backend 
capacity planning is taken care of.


P.



On 17/06/2010 9:37 AM, Stephen Carter wrote:
>
> Hi Guys,
>
> Sorry for a possible very dumb question.
>
> *Does anyone know of the reason why the NBN is being released with 
> different Up and Down speeds?*
>
> Some possible reasons that I can think of are (but can't validate as I 
> don't personally agree):
>
> a) Possible cheaper CPE as transmission strength on cheap CPE is more 
> attainable
>
> b) Transit Costs (can't understand why at this scale)
>
> c) Limitations of their chosen design
>
> Please be gentle J
>
> Thanks
>
> ------------------------------------------------------------------------
> Scanned by *MailMarshal*
> **
> ------------------------------------------------------------------------
>
>
> _______________________________________________
> AusNOG mailing list
> AusNOG at lists.ausnog.net
> http://lists.ausnog.net/mailman/listinfo/ausnog
>    

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.ausnog.net/pipermail/ausnog/attachments/20100617/7618311c/attachment.html>