DIN ISO 8878:1989-09

Defines two methods for providing the OSI Connection Mode Network Service (CONS) by using the X.25 Packet Level Protocol (X.25/PLP).The first method (in the main body of this standard specifies a mapping between elements of the OSI CONS and elements of the 1984 version of the X.25/PLP 1984). The second method (in Annex A of this standard) defines a Subnetwork Dependent Convergence Protocol (SNDCP) that shall be used to provide the OSI CONS over subnetworks or with equipment using the 1980 version of the X.25/PLP. Also covers the annexes B E of this standard; the terms of definition for the OSI Network Service; the relationship between the OSI CONS and the X.25/PLP 1984 and the terms of definitions for the X.25/PLP 1984.