CONTENTS

 1     Introduction
 2     References
        2.1     Identical Recommendations | International Standards
        2.2     Paired Recommendations | International Standards equivalent in technical content
        2.3     Additional references
 3     Definitions
 4     Abbreviations
 5     General principles of the protocol mappings
        5.1     Data Link architecture
        5.2     Modelling of service primitives
        5.3     Relationships between service features and protocol functions
 6     Protocol mapping for X.25 LAPB single link procedure
        6.1     General protocol functions
        6.2     DL connection establishment
        6.3     DL-connection release
        6.4     Data transfer
        6.5     DL connection reset