[LINK] NBN backup service

[David Lochrin]

On 2016-01-26 12:51 Frank O wrote:

> And I’m guessing that if the system failed spectacularly (and NBN phone-call routing - VOIP? - died in the ass due to a catastrophic node failure), all those old exchanges/tech that had previously been point-to-point routing our calls and handling our ADSL connections, would need to be in place to transmit the call to the requisite number … which means that many of the efficiencies and resource savings we should expect from the NBN won’t be achieved. (Think of the real-estate benefits to Telstra if the exchanges could be sold off.) But Alas, all those obsolete exchanges will still need to take up real estate, and be powered and maintained … this MTM NBN will be a boon for jobs in the telephone industry.

My understanding is that the NBN will be the only network in place after final cutover of an area.

Referring to http://www.mynbn.info/rollout/2MSV-04 for the NBN network topology servicing Bowral for example, the hierarchial path appears to go thus:
   Point of Interconnect:   Campbelltown (60Km away as the crow flies);
   Service Area Module:   Moss Vale (9 Km away).
   then presumably the street nodes.

So I wonder whether the Bowral telephone exchange would have any part to play after full cutover?  I believe there are only 120-150 points of interconnect (POIs) in the whole network, the great majority in Telstra exchanges, and the Campbelltown POI services a wide area besides the Southern Highlands - see http://www.mynbn.info/csa/CSA200000010151

Presumably call handling & routing will be done at the POI with the remaining path to a subscriber just a matter of packet-switching data for a node.  Does anyone have any understanding of this level of current NBN architecture?

David L.