Rec. ITU-T I.610 (03/1993) � B-ISDN OPERATION AND MAINTENANCE PRINCIPLES AND FUNCTIONS
FOREWORD
CONTENTS
1 Introduction
    1.1 General
    1.2 Scope
2 OAM principles
    2.1 Network configuration for maintenance activities
    2.2 Relation with the Telecommunication Management Network (TMN)
3 OAM Levels and Flows
    3.1 OAM levels in the B-ISDN
    3.2 Relationship of OAM functions with the B-ISDN Protocol Reference Model
4 Mechanisms to provide OAM flows
    4.1 Physical Layer mechanisms
    4.2 ATM layer mechanism
    4.3 Association of the OAM mechanisms with the transport functions
5 OAM functions of the Physical Layer
    5.1 OAM flows in some physical configurations
    5.2 OAM Functions
6 OAM functions of the ATM Layer
    6.1 OAM flows in some physical configurations
    6.2 OAM functions
7 ATM Layer OAM Cell Format
    7.1 Common OAM Cell Fields
    7.2 Specific Fields for Fault Management Cell
    7.3 Specific Fields for Performance Management Cell
    7.4 Specific Fields for Activation/Deactivation Cell
Appendix I � ATM layer loopback capability
I.1 Introduction
I.2 General Description
I.3 Potential Uses
I.4 Potential Information Fields
I.5 Example of a Simplified Loopback Capability