CONTENTS

1.1     Scope
        1.2     References
        1.3     Definitions
        1.4     Abbreviations
        1.5     Description
        1.6     Operational requirements
                  1.6.1     Provision and withdrawal
                  1.6.2     Requirements on the originating network side
                  1.6.3     Requirements on the destination network side
        1.7     Primitive definitions and state definitions
                  1.7.1     Primitive definitions
                  1.7.2     State definitions
        1.8     Coding requirements
                  1.8.1     Operations and errors
                  1.8.2     Coding rules
        1.9     Signalling procedures at the coincident S_B and T_B reference point
                  1.9.1     Normal operation
                  1.9.2     Exceptional procedures
       1.10     Procedures for interworking with private B-ISDNs
                 1.10.1     Originating interface
                 1.10.2     Destination interface
       1.11     Interactions with other networks
                 1.11.1     Interworking with N-ISDNs
                 1.11.2     Interworking with non-ISDNs
                 1.11.3     Interworking with frame relay
                 1.11.4     Interworking with PSPDNs
       1.12     Parameter values (timers)
                 1.12.1     Timer at the coincident S_B and T_B reference point
                 1.12.2     Timer at the T_B reference point
       1.13     Dynamic description (SDLs)
Annex A – Network look-ahead indication
        A.1     Scope
        A.2     Coding requirements
                  A.2.1     Messages
                  A.2.2     Information elements
        A.3     Signalling procedures at the T_B reference point
                  A.3.1     Normal operations
                  A.3.2     Error handling procedures
Appendix I – Information flows