CONTENTS

�1���� Scope
�2���� References
������� 2.1���� Normative references
������� 2.2���� Informative references
�3���� Abbreviations and acronyms
�4���� Definitions
�5���� General description
�6���� Boundaries of MTP level 3 using the services of Recommendation Q.2140
������� 6.1���� Definition of the lower boundary of MTP level 3 with SSCF at NNI
������� 6.2���� Definition of the upper boundary of MTP level 3
������� 6.3���� Interactions between level 1 and MTP level 3 using the services of Recommendation Q.2140
�7���� Interworking between signalling links that provide the services of Recommendation Q.2140 [1] with signalling links offering the services of Recommendation Q.703 [8]
�8���� Compatibility in MTP-3b
�9���� Signalling network functions and messages
������� 9.1���� Maximum SDU size
������� 9.2���� Changeover procedure
������� 9.3���� Signalling route set congestion method according to 11.2.3/Q.704 [2]
������� 9.4���� Signalling link management
������� 9.5���� Service indicator
������� 9.6���� Coding conventions
������� 9.7���� General format of messages conveying peer-to-peer information of user parts
������� 9.8���� Formats and codes of signalling network management messages
����������������� 9.8.1���� Changeover message
����������������� 9.8.2���� User part unavailable message
������� 9.9���� Timers and timer values
10���� Testing and maintenance
Appendix I � Insights into architectural aspects and boundaries of MTP-3 using the services of Recommendation Q.2140
������� I.1���� Introduction
�� �����I.2���� Functional architecture of the MTP-3 using the services of Recommendation Q.2140
������� I.3���� Elements for layer-to-layer communication
����������������� I.3.1���� General
����������������� I.3.2���� Definition of the lower boundary of the MTP-3 in performing MTP-3b functionality
����������������� I.3.3���� Definition of the upper boundary of the MTP-3
����������������� I.3.4���� Definition of the boundary between the MTP-3 and Management System
����������������� I.4.2���� Signalling traffic flow control
����������������� I.4.3���� Signalling link management