Abstract
The 1970s heralded the beginning of the developnaent of public networks either in the form of experimental networks (e.g., France: RCP, U.K: EPSS) or commercial networks (e.g., Canada: Datapac, U.S.A: Telenet). The basis of all of these networks was the belief that packet switching was an appropriate technology for public data networks (PDNs). However, in their embryonic stages, the designs of each of these networks incorporated substantially different terminal access procedures for both host computers and slow speed character terminals. It was recognized that the commercial viabihty of these networks hinged largely on the development and adoption of standard access protocols. These standards would facilitate the connection of varying types of data terminal equipments (DTEs) to the various public networks being developed as well as facilitate international internetworking.
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