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[55] [56] By the 1990s, telecommunication networks such as the public switched telephone network (PSTN) had been largely digitized with very-large-scale integration (VLSI) CMOS PCM codec-filters, widely used in electronic switching systems for telephone exchanges and data transmission applications.
Donald Davies (1924–2000) independently invented and named the concept of packet switching for data communications in 1965 at the United Kingdom's National Physical Laboratory (NPL). [16] [9] In the same year, he proposed a national commercial data network in the UK employing high-speed switching nodes.
Paul Baran (born Pesach Baran / ˈ b æ r ən /; April 29, 1926 – March 26, 2011) was a Polish American engineer who was a pioneer in the development of computer networks.He was one of the two independent inventors of packet switching, which is today the dominant basis for data communications in computer networks worldwide, and went on to start several companies and develop other ...
this is the structure of network general, every telecommunications network conceptually consists of three parts, or planes (so-called because they can be thought of as being and often are, separate overlay networks): The data plane (also user plane, bearer plane, or forwarding plane) carries the network's users' traffic, the actual payload.
During 1965-67 he invented modern data communications, including packet switching, high-speed routers, layered communication protocols, hierarchical computer networks and the essence of the end-to-end principle, concepts that are used today in computer networks worldwide. He envisioned, in 1966, that there would be a "single network" for data ...
Packet Switch Stream (PSS) was the Post Office Telecommunications (later to become British Telecom) national X.25 network with a DNIC of 2342. British Telecom renamed PSS Global Network Service (GNS), but the PSS name has remained better known. PSS also included public dial-up PAD access, and various InterStream gateways to other services such ...
Long-distance technologies invented during the 20th and 21st centuries generally use electric power, and include the telegraph, telephone, television, and radio. Early telecommunication networks used metal wires as the medium for transmitting signals. These networks were used for telegraphy and telephony for many decades.
In the late 1960s and early 1970s, the pioneers of packet switching technology built computer networks providing data communication, that is the ability to transfer data between points or nodes. As more of these networks emerged in the mid to late 1970s, the debate about communication protocols became a "battle for access standards".