CONTENTS

 1     Scope
 2     References
 3     Terms and definitions
 4     Abbreviations
 5     Transport entities in the OTN
        5.1     General introduction
        5.2     Bidirectional transport entities and uni-directional monitoring
 6     Performance monitoring capabilities in the OTN
        6.1     Optical impairments and digital error performance
        6.2     Monitored layer signals
        6.3     ODUk and OTUk overhead
        6.4     In-Service Monitoring and Out-of-Service Measurement
 7     Error performance events and parameters
        7.1     Severely Errored Seconds and Background Block Errors
        7.2     FEC Corrected Errors
 8     Availability
 9     Network reference model
10     Error performance objectives
       10.1     Error performance objectives for the HROP
       10.2     Error performance objectives for the domains of a real path
       10.3     Error performance objectives for the section
11     Performance limits – General considerations
       11.1     Relationship between performance limits and performance objectives
       11.2     Types of limits
12     Bringing-Into-Service procedures and limits
       12.1     Calculation of the BIS limits
13     Performance levels and limits for maintenance
       13.1    Calculation of limits for maintenance