Optus Warns it will take at least three years to launch a new satellite.
"...
Optus is understandably in a rush to convince NBNCo of the merits of satellite technology.
The carrier's current generation of satellites, while among "the youngest in the world", *** are not capable of delivering the network speeds mandated by the NBN (at least 12mbps). ***
To achieve these speeds, Optus would be required to launch the next generation of KA-band satellites, which are already in use by several providers in the United States.
In a presentation given to iTnews, Sheridan .."
-- Just keep this story in mind I think the 3 part is correct, just not years.