CONTENTS

 1     General
 2     Requirements and assumptions
        2.1     Requirements
        2.2     Assumptions
 3     Physical Entities (PEs)
 4     Mapping requirements
 5     Mapping the distributed functional plane to the physical plane
        5.1     Mapping of functional entities to physical entities
        5.2     Mapping of FE-FE relationships to PE-PE relationships
        5.3     Selection of underlying protocol platforms
                  5.3.1     SCP-SSP interface
                  5.3.2     AD-SSP interface
                  5.3.3     IP-SSP interface
                  5.3.4     SN-SSP interface
                  5.3.5     SCP-IP interface
                  5.3.6     AD-IP interface
                  5.3.7     SCP-SDP interface
                  5.3.8     User  interfaces
                  5.3.9     Enhanced ISDN CPE-CUSP interface
                 5.3.10     AD-CUSP interface