X.25 Packet-Switched Network Layer
The 1970s heralded the beginning of the development of public data networks (PDNs), offering packet switching services, e.g., Canada: Datapac, France: Transpac, USA: Telenet. The commercial viability 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.
KeywordsData Packet Incoming Call Virtual Circuit Call Setup Call Request
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