Recommendation ITU-T G.872 (03/2024) Architecture of the optical transport network
Summary
History
Table of Contents
1 Scope
2 References
3 Definitions
     3.1 Terms defined elsewhere
     3.2 Terms defined in this Recommendation
4 Abbreviations and acronyms
5 Conventions
     5.1 Notational
     5.2 Information structures and interfaces
     5.3 Diagrammatic
6 Functional architecture of the OTN
7 OTN digital layers
     7.1 Optical data unit layer network
          7.1.1 ODUk multiplexing
          7.1.2 ODU clients and servers
          7.1.3 ODU trail termination
          7.1.4 ODU transport entities
               7.1.4.1 ODU tandem connections
          7.1.5 ODU topological components
     7.2 Optical transport unit (OTU) layer network
          7.2.1 OTU trail termination
          7.2.2 OTU transport entities
          7.2.3 OTU topological components
     7.3 Client/server associations
          7.3.1 ODU/client adaptation
          7.3.2 ODU/ODU adaptation
          7.3.3 OTU/ODU adaptation
     7.4 Flexible OTN interfaces
          7.4.1 Ethernet optimized OTN
          7.4.2 FlexO regeneration
8 Architecture of the media network supporting the OTN digital layers
     8.1 Media constructs
     8.2 Media element
     8.3 Optical tributary signals
     8.4 Management of optical signals
          8.4.1 OMS and OTS media channel group
          8.4.2 OSC
          8.4.3 Optical signal maintenance entities
          8.4.4 Media channels and OSMEs
     8.5 Management of media and signals
          8.5.1 Management of media channels
          8.5.2 Assignment of signals to media channels
          8.5.3 Management of OTSiA connections
     8.6 Modulator/demodulator and termination functions
     8.7 Client/server associations
          8.7.1 M-AI/OTU adaptation function
          8.7.2 OMS-O/OTSiG-O adaptation function
          8.7.3 OTS-O/OMS-O adaptation function
          8.7.4 M-AI/OTS-O adaptation
9 Media network topology
10 Management
     10.1 Capabilities
          10.1.1 Fault, configuration and performance management
          10.1.2 Client/server interaction
          10.1.3 Adaptation management
          10.1.4 Connection and MCG supervision
               10.1.4.1 Continuity supervision
               10.1.4.2 Connectivity supervision
               10.1.4.3 Maintenance information
               10.1.4.4 Subnetwork/tandem/unused connection supervision
          10.1.5 Connection quality supervision
          10.1.6 Management communications
          10.1.7 Frequency and time synchronization
     10.2 Connection supervision techniques
     10.3 Connection supervision applications
          10.3.1 Unused connections
          10.3.2 Connection monitoring
11 OTN survivability techniques
Annex A  Fine grain flexible optical data unit path layer network
     A.1 Fine grain flexible optical data unit path layer network
          A.1.1 fgODUflex clients and servers
          A.1.2 fgODUflex trail termination
          A.1.3 fgODUflex transport entities
               A.1.3.1 fgODUflex tandem connections
          A.1.4 fgODUflex topological components
     A.2 Client/server associations
          A.2.1 fgODUflex/client adaptation
          A.2.2 ODU/fgODUflex adaptation
     A.3 Management
     A.4 OTN survivability techniques
Appendix I  Relationship between optical channel and optical tributary signal terminology
Appendix II  Use of optical transport networks to carry Flex Ethernet
     II.1 Overview of Flex Ethernet
     II.2 FlexE unaware
     II.3 FlexE aware
     II.4 FlexE terminating
Appendix III  Examples of views of an optical data unit layer network
Appendix IV  Examples of multi-domain optical transport network applications
Bibliography