CANTAT-1 was the first Canadian transatlantic telephone cable, between Corner Brook, Newfoundland and Oban, United Kingdom, which followed on from the success of TAT-1. It was conceived and approved as stage one of a proposed commonwealth round the world cable. It operated from 1961 to 1986, initially carrying 60 telephone circuits, later modified from 4 kHz channels to 3 kHz channels, expanding capacity to 80 telephone circuits. It was operated by COTC., renamed Teleglobe.
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