Table of Contents - G.8312 (2020) Amd. 4 (05/2025) -

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	Metro transport network interfaces
7	MTN section layer
	7.1	Frame format
	7.2	Rate adaptation
	7.3	Processing blocks with uncorrected forward error correction errors
8	MTN path layer
	8.1	MTNP layer forwarding
	8.2	MTNP OAM formats
	8.3	OAM insertion
	8.4	OAM extraction
9	MTN overhead description
	9.1	Trail trace identifiers
	9.2	MTNS overhead description
	9.3	MTNP overhead description
10	MTN maintenance signals
	10.1	MTNS maintenance signals
	10.2	MTNP maintenance signals
11	MTN client mappings
	11.1	Ethernet MAC based clients
Annex A – Fine grain metro transport network
	A.1	Fine grain MTN structure
	A.2	fgMTNP to MTNP adaptation
	A.3	fgMTN path layer
	A.4	fgMTN client mappings
Annex B – Hitless bandwidth adjustment of fgMTNP
	B.1	fgMU hitless bandwidth adjustment overhead
	B.2	Adjustment procedure between neighbouring nodes
	B.3	End-to-end adjustment procedure
Appendix I – Background on error marking in MTN
I.1
	Page
I.2
Appendix II – Test Vectors for MTNP OAM and CRC-12 computation example
Appendix III – Rate adaptation considerations
	III.1	Explanation on illegal block sequence
	III.2	Example 1: Idle Insertion in {T, T} and idle deletion in {T, I, T}
	III.3	Example 2: Idle Insertion in {T, D} and Idle deletion in {T, I, D}
	III.4	Example 3: Idle Insertion in {E, S} and Idle deletion in {E, I, S}
Appendix IV – Test vectors for CRC-7 computation example of fgMU overhead
Appendix V – Illustration of ToD interval for Mapping CBR clients into fgCPU using GMP
Appendix VI – Illustration of bit mapping for mapping CBR clients into fgCPU
	VI.1	CBR client receiving order
	VI.2	Bit mapping for AMP method
	VI.3	Bit mapping for GMP method