CONTENTS

 0     General
 1     X.25 virtual call and permanent virtual circuit bearer service
        1.1     Scope
        1.2     References
        1.3     Definitions
        1.4     Symbols and abbreviations
        1.5     Description (I.232.1)
        1.6     Derivation of the functional model
        1.7     Information flows
        1.8     SDL diagrams for functional entities
        1.9     Functional entity actions (FEAs)
       1.10     Allocation of functions to physical entities
 2     Frame mode virtual call and permanent virtual circuit bearer services
        2.1     Scope
        2.2     References
        2.3     Definitions
        2.4     Symbols and abbreviations
        2.5     Description
        2.6     Derivation of the functional model
        2.7     Information flows
        2.8     SDL diagrams for functional entities
        2.9     Functional entity actions (FEAs)
       2.10     Allocation of functions to physical entities