Prime Minister Julia Gillard will today switch on the first site of the National Broadband Network on mainland Australia. Ms Gillard and Communications Minister Stephen Conroy will turn on the site at a secondary school in Armidale in northern New South Wales. Armidale is one of five first-release test sites where fibre optic cable has been laid for the broadband network. Areas in Melbourne, Townsville, coastal New South Wales and South Australia will also be switched on in coming months.