[LINK] Does the NBN bring redundancy?

Kim Holburn kim at holburn.net
Wed Oct 5 17:27:20 AEDT 2011

So when I look at the NBN's own map:


What are all the interconnecting lines?  Are they part of the NBN or not?


On 2011/Oct/05, at 11:21 AM, Paul Brooks wrote:

> On 5/10/2011 5:53 AM, Fernando Cassia wrote:
>> As an observer from the other side of the globe, I wonder what the
>> policy has been by the NBN project with regards to existing fibre
>> networks. Does the NBN bring redundancy to private networks -NBN fibre
>> layout in parallel with existing fibre lines- or does it re-use
>> existing fibre backbones when available?.
> Fernando - The fibre portion of the NBN is primarily access network - the GPON bit -
> which is most parts of the country are areas where there is no existing fibre in the
> access network.
> Where there is access network fibre, such as within business precincts, the NBN fibre
> is in parallel, so an NBN connection could be a redundancy option for a fibre-based
> service on a different fibre network.
> Of course, if the user wants redundancy the user would want to be mindful of whether
> both fibre cables used the same ducts and building entry points.
> NBN might acquire dark fibre cores from an existing fibre cable, which could be
> thought of as re-using existing cables - but at the purely passive glass level, not in
> any active sense.
> For long-haul fibre backbones (which is what I see in my mental picture when I see the
> word 'backbone') the NBN is not playing in that space - service providers have to
> approach one or more of the existing long-haul fibre network operators for
> transmission to get to an NBN hand-off point (Point of Interconnect), and then the
> service rides on NBN fibre from there onwards.
>> If the later, does the NBN
>> pay the existing fibre networks for traffic, or is there some sort of
>> mutual agreement to let pass traffic free of charge in exchange for
>> the use of each other´s network segments?.
> The NBN does not exchange traffic with any other network within the NBN active
> network. Traffic passes from an NBN-connected point through the NBN, and exits the NBN
> into the RSPs network at the PoI.
> Once in the RSP network of course the traffic can then be exchanged with other
> networks in the usual way - including possibly re-entering the NBN at a PoI and being
> carried back through the NBN to another NBN connected endpoint.
> Hope this helps.
> Paul.
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Kim Holburn
IT Network & Security Consultant
T: +61 2 61402408  M: +61 404072753
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