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This paper describes IBM's use of Recommendation X and related recommendations of the International Telegraph and Telephone Consultative Committee. After reviewing the development history of X and some of the motivations for using it, the paper gives an overview of packet-switched data networks. The reader is then given a brief technical description of Recommendation X and some other recommendations used in conjunction with X. The architectural relationships between X and IBM's Systems Network Architecture (SNA) are described for packet-switched X connections between SNA and non-SNA nodes. Specific elements of Recommendation X used in SNA nodes are defined. After several IBM products that support X and some of the related recommendations are described, IBM's equipment for testing the X interface is discussed.
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