Table of Contents - G.798.2 (02/2026) - Characteristics of optical transport network hierarchy equipment functional blocks – Media

1	Scope
2	References
3	Definitions
	3.1	Terms defined elsewhere
	3.2	Terms defined in this Recommendation
4	Abbreviations and acronyms
5	Conventions
6	Supervision
	6.1	Alarm reporting control
	6.2	Defects
	6.3	Consequent actions
	6.4	Defect correlations
	6.5	Performance filters
7	Information flow across reference points
8	Generic processes
	8.1	Trail trace identifier (TTI) processing
	8.2	Multiplex structure identifier (MSI) acceptance processe
	8.3	Generic layer fault processing
9	Media element
10	OTSi adaptation functions
	10.1	OTSi to OSC adaptation function (OTSi/OSC_A)
11	OSC (layer) functions
	11.1	Connection functions
	11.2	Termination functions
	11.3	Adaptation functions
12	OTS-O layer functions
	12.1	Connection functions
	12.2	Termination functions
	12.3	Adaptation functions
13	OMS-O layer functions
	13.1	Connection functions
	13.2	Termination functions
	13.3	Adaptation functions
14	OTSiA and OCh (layer) functions
	14.1	Connection functions
	14.2	Termination functions
	14.3	Adaptation functions
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Appendix I – Examples of media elements 
Appendix II – Trail protection of OTS-O/OMS-O layers in support of media layer protection 
	II.1	OxS-O trail protection sublayer functions