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packet switching. n. A method of data transmission in which data is broken into small blocks that are transmitted over different channels and are reassembled into their original order at their destination.
The First Packet Switches. The first international standard for wide area packet switching networks was X.25, which was defined at a time when circuits were analog and very susceptible to noise. Subsequent packet technologies, such as frame relay, were designed for almost-error-free digital lines.