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The PMG, the original name for Telstra and the Australian Post Office was always a pioneer in the distribution of radio and TV content.
As an example, the PMG and then the telecommunications offshoot, Telecom Australia pioneered the distribution of digital distribution of ABC-FM's source signal from the Adelaide's Collinswood studios to the rest of the country. The stereo signals were converted to digital and coded via pulse-code modulation. Obviously there were repeaters and amplifiers.
Since the establishment of ABC-FM in 1976, very few people would have realised that the signal was an A to D and then D to A. This was long before the launch of Aussat in 1986 as a method of distribution of program material and very long before the use of IP streams as a method of conveying audio and video information.
Thank you,
Anthony of exciting Belfield