CONTENTS

 1     Introduction
 2     Modelling concepts
        2.1     Relationship with the X.200-Series Recommendations
        2.2     Control and user planes and protocol blocks
        2.3     Local and global significance
 3     The model
        3.1     Generic Protocol Block
        3.2     Relations between layers in one protocol block
        3.3     Synchronization and coordination function (SCF) relation between protocol blocks
        3.4     Data flow modelling
 4     ISDN management
        4.1     SCF (Synchronization and Coordination Function)
        4.2     Layer management functions
 5     Interworking
        5.1     General
        5.2     Relationships with the OSI RM
 6     Examples
        6.1     Basic call situations (no supplementary service, no interworking)
        6.2     More elaborate situations
        6.3     Interworking