CONTENTS

 1     Scope
 2     References
 3     Terms and definitions
 4     Abbreviations
 5     Conventions
 6     DCN Characteristics
        6.1     TMN application
                  6.1.1     X Management Subnetwork Architecture
                  6.1.2     Reliability of MCN
                  6.1.3     Security of MCN
                  6.1.4     MCN data communications functions
        6.2     ASTN Application
                  6.2.1     Topology of SCN
                  6.2.2     Reliability of SCN
                  6.2.3     Security of SCN
                  6.2.4     SCN Data Communication Functions
        6.3     Other Applications Requiring Communication Networks
        6.4     Separation of Various Applications
 7     DCN Functional Architecture and Requirements
        7.1     Specification of Data Communication Functions
                  7.1.1     ECC Access Function
                  7.1.2     ECC Data-Link Layer Termination Function
                  7.1.3     [Network Layer PDU into ECC Data-Link Frame] Encapsulation Function
                  7.1.4     Ethernet LAN Physical Termination Function
                  7.1.5     [Network Layer PDU into Ethernet Frame] Encapsulation Function
                  7.1.6     Network Layer PDU Forwarding function
                  7.1.7     Network Layer PDU Interworking Function
                  7.1.8     Network Layer PDU Encapsulation Function
                  7.1.9     Network Layer PDU Tunnelling Function
                 7.1.10     Network Layer Routing Function
                 7.1.11     IP Routing Interworking Function
                 7.1.12     [Applications to Network Layer] Mapping Function
        7.2     Provisioning Requirements
        7.3     Security Requirements
Annex A - Requirements for Three-way Handshaking
Appendix I - Constraints of the interworking functions in DCN
Appendix II - Bibliography