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 Diagrammatic
5.3 Terminological
5.4 Representational
6 Functional architecture of OTN
7 OTN digital layers
7.1 Optical data unit (ODU) layer network
7.2 Optical transport unit (OTU) layer network
7.3 Client/server associations
8 Architecture of the media layer
8.1 Media constructs
8.2 Media element
8.3 Optical tributary signals and interfaces
8.4 Management of optical signals
8.5 Management of media and signals
8.6 Modulator and termination functions
8.7 Client/server associations
9 Media topology
9.1 Unidirectional and bidirectional connections
9.2 Point‑to‑multipoint media channels
10 Management
10.1 Requirements
10.2 Connection supervision techniques
10.3 Connection or media channel supervision applications
11 OTN survivability techniques
12 The black link approach
Annex A – Media change and physical domain change
Appendix I – Relationship between OCh and OTSi terminology
Appendix II – Use of the OTN 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 ODU layer network
Appendix IV – Examples of multi‑domain OTN applications
Appendix V – Examples of the configuration of media channels
V.1 Construction of network media channels
V.2 Use of flexible grid capable filter to route media channels
Appendix VI – Example of media network using tuneable modulator/demodulator for
routing
VI.1 Network using couplers
VI.2 Network using wide-band filters and couplers
Bibliography