CONTENTS

 1     Scope
 2     References
 3     Terms and definitions
        3.1     Definitions
        3.2     Terms defined in other Recommendations
 4     Abbreviations
 5     Applications
        5.1     System types
        5.2     System components
 6     Types of transmission medium
 7     Definitions of functions and compound functions (Functional blocks)
        7.1     Functions defined in other Recommendations
        7.2     New functions and compound functions (Functional blocks)
                  7.2.1     Optical Channel Adaptation and Termination (OCA/OCT) compound function
                  7.2.2     Optical Supervisory Channel Adaptation/Optical Channel Termination (OSCA/OCT) compound function
                  7.2.3     Optical Multiplex Section Adaptation and Termination (OMSA/OMST) compound function
                  7.2.4     Optical Amplifier Section Adaptation and Termination (OASA/OAST) compound function
                  7.2.5     Other functions/processes for internetworking
 8     Reference configurations for single-channel systems
        8.1     Compound functions describing single-channel systems
        8.2     Functional configuration for single-channel interoffice line (IOL) systems
                  8.2.1     Without in-line function capabilities
                  8.2.2     In-line non-regenerative repeater
                  8.2.3     Regenerator
 9     Reference configurations for multichannel systems
        9.1     Functional blocks describing multichannel systems
        9.2     Functional configurations for a multichannel interoffice line system
                  9.2.1     Without in-line function capabilities
                  9.2.2     Non-regenerative repeater
                  9.2.3     Regenerator
        9.3     Interworking of compound functions in a multichannel system
10     Optical safety considerations (Optical surge prevention, automatic power shutdown)         
Annex A – Relation between compound functions and layered transport network architecture
Annex B – Mapping between compound functions and transport functions
Appendix I – Physical implementations of multichannel systems
        I.1     Transponder implementations
        I.2     Stand-alone Booster Amplifier (BA) and Pre-Amplifier (PA)
Appendix II – Realizations of new functions
       II.1     Optical Amplification (OA) function
       II.2     Dispersion Accommodation (DA) function
Appendix III – Example of functional modelling for single-channel and multichannel systems
      III.1     Example 1: Stand-alone equipment
      III.2     Example 2: Mapping of functional blocks of a line terminal in a single-channel system on OAT and OAR implementations