Transit backhaul key to NBN rollout schedule

NBN Co says the development of its transit backhaul network, which will connect its individual fibre serving areas to its points of interconnect, is the key to determining its FTTH rollout schedule.

NBN Co spokesperson said

An NBN Co spokesperson said: "There are a number of complex factors which go into the rollout sequence of the NBN, particularly in the early years where much of our focus is in establishing the transit network - the backbone of the NBN. Without it, there is no connection between any premise, libraries included, and our Points of Interconnect where traffic gets handed off to the retail service providers who are the ultimate service providers to end-users, including local government and libraries.

"For the time being, the constraints around delivering the transit network are very much a dominant consideration in our rollout. Once the transit network is established, NBN Co gains more flexibility to take account of other criteria. It is our intention to try to take into account critical local public infrastructure - schools, hospitals, libraries, etc - once we gain this flexibility."

According to NBN Co the Transit Backhaul network will comprise some 57,000kms of fibre, much of it leased from existing owners of fibre networks. "It is required predominantly in rural and remote regions to enable aggregation of communication traffic to a scale required to provide effective and efficient points of interconnect for NBN Co's wholesale access seekers. This network will be a common network used for all three network technologies and NBN Co's own needs for managing the network," the corporate plan states.

In major centres PoIs will be collocated with fibre access nodes. Nevertheless NBN Co will nevertheless need backhaul from these PoIs to carry its network management and signalling traffic.

The corporate plan adds

The corporate plan adds: "In determining the requirement for transit backhaul, NBN Co has considered the routes currently being constructed as part of the Government's Regional Backhaul Blackspots Program. Where these routes overlap with NBN Co's transit backhaul requirements, the costs of NBN Co acquiring the routes henceforth have been factored in to NBN Co's capital expenditure forecasts." The corporate plan envisages construction of the network being completed over four years.