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Australia has very highly developed domestic communications networks, particularly in and between the major cities along the eastern seaboard. In addition, a number of established and new entrants are expanding the coverage and capacity of the domestic `backbone' network. Optic fibre is the predominant technology used within Australia, supporting over 95 per cent of the `backbone' network. Satellite and microwave networks are used mostly to service regional and rural areas. They also serve as a backup facility for the fibre optic networks in the population centres. A comprehensive list of the domestic networks is provided in Appendix B. Australia's key eastern seaboard capitals of Sydney, Melbourne and Brisbane are currently linked by three major fibre