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 virtual circuit A communications arrangement in which data from a source user may be passed to a destination user over various real circuit configurations during a single period of communication. : Virtual circuits are generally set up on a per-call basis and are disconnected when the call is terminated however, a permanent virtual circuit can be established as an option to provide a dedicated link between two facilities. Synonyms logical circuit, logical route.
 A network that provides virtual circuits and that is established by using the facilities of a real network.
 Vertical Redundancy Check In synchronized parallel bit streams, a redundancy check that is based on the formation of a block check following preset rules, in which the check-formation rule applied to blocks is also applied to characters, and in which the check is made on parallel bit patterns.