The federal government has approved the connection of another 150,000 homes by fibre optic cable in New South Wales, South Australia, Victoria, the ACT and Queensland while future plans for Tasmania remain in limbo.

Communications Minister Malcolm Turnbull has committed to honouring existing contracts, which cover about 85 per cent of the state, but there are indications lead contractor Visionstream is struggling to fulfill its obligations. 

Premier Lara Giddings described the expansion of activity interstate as a ``continuing snub'' to Tasmania's NBN rollout. 

``The Liberal government is fast sabotaging Tasmania's first mover advantage and the jobs and opportunities that come with it,'' Ms Giddings said.

The decision follows a re-drafting of NBN Co maps, which now only show areas where work was completed or physical works had actually begun.

The change wiped 60 Tasmanian suburbs and towns expecting to get the NBN off the map, sparking outrage. 

``It is astonishing that the government has brought forward the interstate rollout to minimise disruption for NBN contractors while the state with the highest unemployment rate in the country is left high and dry,'' Ms Giddings said.

Civil Contractors Federation chief executive Tony Cook expected Tasmanian contractors would be waiting until next year before they get any certainty. 

NBN Co's new chairman Ziggy Switkowski is reviewing the project and his report is due to be released on December 2. 

``It'll be after Christmas before we see any detail out of that report, then it will have to be analysed and they'll work out what it means for us,'' Mr Cook said.

Visionstream has repeatedly stated it is committed to completing its contract with NBN Co.