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Systems Network Architecture (SNA) provides a framework for combining hardware and software components into an efficient, coherent teleprocessing system. To put this architecture into an historical perspective, the first paper in this issue, by McFadyen, is an overview in which the functional layers of SNA are defined as follows: Transmission management controls the actual flow of traffic through the network; functional management controlts the format of information sent to and from the application layers; application consists of user application programs in the host computer and equivalent functions in other nodes.
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