[AusNOG] Discussion point: Why aren't the NBNCo tails symmetric in speed?

[Damian Guppy]

NBN is built on GPON tech, which is normally asymmetrical. I believe it is
ITU-T G.984 which supports 2.488Gbit/s down and 1.244Git/s up.  Most home
users have an asymmetrical data requirement, so it makes sense to divide up
the available spectrum with a bias to downstream. Same reason ADSL is used
and is asymmetrical even through there are SDSL specs out there.

--Damian


On Mon, Apr 7, 2014 at 6:52 PM, Skeeve Stevens <
skeeve+ausnog at eintellegonetworks.com> wrote:

> Hey all,
>
> I am sure this will spurn a healthy discussion... perhaps with conflicting
> views...
>
> But I was wondering the other day 'Why aren't NBNCo tails sold as
> symmetric speeds?'
>
> Considering:
>
> - The transit the RSP buys is symmetric (nearly always)
> - The network core of the RSP is symmetric
> - The handoff to either NBNCo or an aggregator (and then NBNCo) is pretty
> much always symmetric
> - The PoI's core is symmetric
> - The fibre to the home is symmetric capable
> - The NTU is just ethernet - symmetric
> - Anything they plug into the NTU is symmetrical - ethernet
>
> Google Fibre in the US is 1G/1G in speeds...
>
> So... unless I am missing something obvious (always possible)... Why are
> NBNCo tails not sold as symmetrical speeds?
>
> I am not sure why there is this artificial design in these products to
> make them asymmetric.  There doesn't seem to be any gain by doing this that
> I can think of.
>
> Gone are the days of DSL like speeds and unbalanced design... even ATM was
> symmetrical.
>
> Keen for peoples opinions.
>
> ...Skeeve
>
> *Skeeve Stevens - *eintellego Networks Pty Ltd
> skeeve at eintellegonetworks.com ; www.eintellegonetworks.com
>
> Phone: 1300 239 038; Cell +61 (0)414 753 383 ; skype://skeeve
>
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> linkedin.com/in/skeeve
>
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>
>
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