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An important step in preparing for a nationwide, switched, video telepho7ie service is the formulation of a transmission plan for the video and audio portion of the network. The transmission plan described in this paper features digital transmission for the long-haul portion of the network and analog transmission for the local portion, close to the customer. The performance of each of the components of the network, that is, station equipment, local loops, trunks and switches, is discussed for the network as it is expected to be configured initially and as it might evolve through the 1970s.
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HE Brown (1971) studied this question.
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