CONTENTS

1 Scope
2 References
3 Definitions
4 Abbreviations
5 OAM principles
5.1 Network configuration for maintenance activities
5.2 Relation with the Telecommunications Management Network (TMN)
5.3 Management of the information produced by OAM functions
6 OAM levels and flows
6.1 OAM levels in the B-ISDN
6.2 Relationship of OAM functions with the B-ISDN models
6.2.1 B-ISDN Protocol Reference Model (PRM)
6.2.2 ATM transport network model
7 Mechanisms to provide OAM flows
7.1 Physical layer mechanisms
7.1.1 SDH-based transmission systems
7.1.2 Cell-based transmission systems
7.1.3 PDH-based transmission systems
7.2 ATM layer mechanism
7.2.1 F4 flow mechanism
7.2.2 F5 flow mechanism
7.3 Association of the OAM mechanisms with the transport functions
8 OAM functions of the physical layer
8.1 OAM flows in some physical configurations
8.2 OAM functions
8.2.1 OAM functions supported solely by the flows F1 to F3
8.2.2 OAM functions with regard to the system management
8.3 Additional OAM functions
8.3.1 LCD events
8.3.2 UNEX events
9 OAM functions of the ATM layer
9.1 OAM flows in some physical configurations
9.2 OAM functions
9.2.1 OAM functions for VPC (F4 flow)
9.2.2 OAM functions for the VCC (F5 flow)
9.2.3 Activation/deactivation procedures
10 ATM layer OAM cell format
10.1 Common OAM cell fields
10.2 Specific fields for fault management cell
10.2.1 AIS/RDI fault management cell
10.2.2 Continuity check fault management cell
10.2.3 Loopback cell
10.3 Specific fields for performance management cell
10.3.1 Forward performance monitoring cell
10.3.2 Backward reporting cell
10.4 Specific fields for activation/deactivation cell
10.5 Specific fields for system management cell
10.6 Specific fields for APS cell
Annex A Guidance on estimating VPC/VCC outages
Annex B SDLs for activation/deactivation using OAM cells
Annex C Procedures to be performed when receiving LB cells
C.1 Case of seg_LB cells
C.2 Case of e-t-e_LB cells
Appendix I Examples of OAM cell error detection codes
Appendix II
II.1 Processes applicable to forward performance monitoring cells
II.1.1 Forced insertion
II.1.2 Non forced insertion
II.2 Process applicable to backward reporting cells
II.2.1 Forced insertion
II.2.2 Non forced insertion
Appendix III Use of segment loopback cells for localizing failures
III.1 Description of failure types which may be observed at the ATM layer level
III.2 Loopback techniques applicable for segment loopback cells
III.2.1 Basic principle of the single loopback technique
III.2.2 Basic principle of the multiple loopback technique
III.3 Examples of use of segment loopback cells for localizing failures occurring at the VP/VC layer levels
III.3.1 Case of Point-to-Point VPC/VCC
III.3.2 Case of point-to-multipoints VPC/VCC
Appendix IV OAM hierarchical levels and their relationship with the functional model of G.805
Appendix V Use of an ID in the segment CC cell
V.1 Basic concepts
V.2 Defect conditions
V.3 CC ID source/sink functions
V.4 SESATM estimation
V.5 Backwards compatibility
V.6 Connection identification for the purposes of through-path monitoring