CONTENTS

 1     Scope
 2     Normative references
        2.1     Identical Recommendations | International Standards
        2.2     Paired Recommendations | International Standards identical in technical content
        2.3     Additional references
 3     Definitions
        3.1     Reference model definitions
        3.2     Network layer architecture definitions
        3.3     Network layer addressing definitions
 4     Abbreviations
 5     Subnetwork dependent convergence function
        5.1     General model
        5.2     Subnetwork user data
        5.3     Subnetwork dependent convergence functions used with ISDN circuit-switched B-channel
 6     Conformance
        6.1     Static conformance
        6.2     Dynamic conformance
        6.3     PICS proforma
Annex A – PICS proforma
        A.1     Introduction
        A.2     Abbreviations and special symbols
        A.3     Instructions for completing the PICS proforma
        A.4     Identification
        A.5     Subnetwork dependent convergence functions for use with X.25 subnetworks