NBN Co, the public-private company set up to manage Australia’s National Broadband Network (NBN), has started a twelve-week review of the infrastructure assets belonging to fixed line incumbent Telstra, The Australian reports. NBN Co has reportedly been granted access to confidential information regarding Telstra’s pits, pipes and ducts, and the infrastructure review is the next step in finalising the rollout schedule for the in-deployment national fibre-optic network. The development comes after NBN Co finalised a deal valued at AUD380 million (USD406 million) with a joint venture between Thiess Services and Siemens, Silcar, which will see the latter roll out the fibre network to around 400,000 premises in Queensland, New South Wales and the Australian Capital Territory. NBN Co meanwhile is still in negotiations with a further five construction firms for the rest of the network rollout, with talks expected to be completed by the end of August 2011. Those firms understood to still be in the running for a role in the network deployment are: Transfield Services, Service Stream, Vision Stream, Monadelphous and South Australian utility ETSA.