CONTENTS

1)     Clause 
2)     References
3)     New Annex A
Annex A  –  Inter-exchange signalling data link layer protocol in Private Integrated Services Networks (PISNs) – Overview of the functions of the data link layer for the support of inter-exchange signalling in PISNs and additions to concepts and terminology to accommodate PISN inter-exchange requirements
        A.1     Overview of the functions and procedures of the data link layer
                  A.1.1     General
                  A.1.2     Overview of data link layer structure
        A.2     Concepts and terminology
                  A.2.1     General
                  A.2.2     Data Link Connection Identification (DLCI)
                  A.2.3     Data link states
                  A.2.4     Service characteristics