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The Sydney–Melbourne co-axial cable was a major telecommunications engineering and construction project in south-eastern Australia in the early 1960s, designed to significantly increase telecommunications transmission capacity between Sydney and Melbourne and other centres, along its route including Canberra. The cable's route was approximately 960 kilometres and roughly followed the Hume Highway as it existed at that time. Key points along the route were Sydney–Liverpool–Campbelltown–Bowral–Goulburn–Canberra–Yass–Gundagai–Wagga Wagga–Culcairn–Albury–Wangaratta–Benalla–Euroa–Seymour–Melbourne. It was five years in the making and cost £6.89 million to complete. Its prime purpose was to boost the capacity for telecommunications between the two major cities. The cable was made up of three pairs of tubes, each pair capable of carrying 1,260 simultaneous telephone connections. There was a marker stone commemorating the official opening of the cable at 532 Hume Highway, Casula but it has since been removed. There is a corresponding marker stone in Gordon Reserve near the Parliament of Victoria in Melbourne. == Origins == The volume of telephone traffic in Australia increased significantly after World War II. As a result, by the 1950s the trunk network was becoming congested. The Postmaster-General's Department (PMG) was also pursuing a policy of automating the telephone and telegraph systems, including the introduction of subscriber-to-subscriber (rather than operator assisted) long distance calls. It was therefore decided, in 1957, that a new high capacity link would be installed between Sydney and Melbourne (via Canberra). A number of systems were considered, including radio transmission. Eventually the decision was taken to install a 6 tube coaxial cable. While this provided more capacity than was necessary at the time, it also allowed for the transmission of television signals along the route. The associated carrier equipment (e.g. the active electronics) was to have sufficient capacity for the first 5 years with facilities for readily increasing the number of channels to meet demand for the next 20 years.). 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Sydney–Melbourne co-axial cable」の詳細全文を読む スポンサード リンク
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