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As a communication technician (CT) in Telstra Services, you never know what the day will bring you. The photos in this eBook were taken by CTs during the course of their day and document the difficult jobs, long distances travelled and unexpected surprises along the way. Ever wondered how mobile phones work? Telstra has produced a short educational video titled 'How Australia Communicates' that explores the basic operation of mobile phones and networks. An introduction to Morse Code, analogue and digital signals and their transmission in telecommunications. The history of experimentation with light and its uses as a signalling device in telecommunications, plus an introduction to optical fibre and its many applications. Explains the mechanical action of early telephone exchanges and many improvements that continue to be made, including computer controlled switching. Describes the technical requirements of long distance transmission across Australia and the development of trunk systems and their dependent networks. Examines emerging technologies that extend the possibilities of modern telecommunications for the delivery of interactive services.