 Based on international research initiatives, particularly the contributions of Rémi Després, packet switching network standards were developed by the International Telegraph and Telephone Consultative Committee (ITU-T) in the form of X.25 and related standards.X.25 is built on the concept of virtual circuits emulating traditional telephone connections.In 1974, X.25 formed the basis for the SERCnet network between British academic and research sites, which later became JANET.