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

[Colin Stubbs]

Have a read of this Skeeve,

http://static.googleusercontent.com/media/research.google.com/en//pubs/archive/36936.pdf

Obviously written while they were still testing and reviewing their
options, but they were leaning towards point to point delivery already.

Makes sense to me. WDM-PON standards weren't and still are not ready yet,
and Google isn't the type of company to screw around trying to save a few
dollars for short term gains.

-Colin



On 9 April 2014 06:38, Skeeve Stevens
<skeeve+ausnog at eintellegonetworks.com>wrote:

> Yes, but how does that matter?
>
> Google Fiber also uses GPON and they are delivering 1G/1G (see:
> http://networkmatter.com/2014/02/27/google-fibers-brewing-little-secret-exposed-its-gpon/
> )
>
> While GPON may be asymmetrical for the end tail, the speeds it can achieve
> are clearly symmetrical in nature... and the speeds that can be achieved
> means that there is no reason at all that 100/100, 50/50, 25/25 or 12/12
> can't be achieved - with no material impact to the network utilisation or
> cost.
>
> Still sounds like an artificial restriction to me.
>
> ...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
>
> facebook.com/eintellegonetworks ;  <http://twitter.com/networkceoau>
> linkedin.com/in/skeeve
>
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>
>
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>
> On Wed, Apr 9, 2014 at 2:02 AM, Damian Guppy <the.damo at gmail.com> wrote:
>
>> 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
>>>
>>> facebook.com/eintellegonetworks ;  <http://twitter.com/networkceoau>
>>> linkedin.com/in/skeeve
>>>
>>> twitter.com/theispguy ; blog: www.theispguy.com
>>>
>>>
>>> The Experts Who The Experts Call
>>> Juniper - Cisco - Cloud - Consulting - IPv4 Brokering
>>>
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>>>
>>
>
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