Summary - G.8312 (2020) Amd. 4 (05/2025) -

Recommendation ITU-T G.8312 describes a transport technology for metro networks (MTNs), including transport of distributed radio access network (D-RAN) and centralized radio access network (C-RAN) traffic. This technology leverages existing and emerging pluggable Ethernet modules and reuses flex Ethernet (FlexE) implementation logic.
Amendment 1 adds several clarifications and also provides test vectors.
Amendment 2 adds an annex to describe the fine grain MTN path and the associate elements.
Amendment 3 adds a new Annex A subclause and Appendix V to describe the method of mapping CBR clients into fgMTNP and a new Annex B to describe the fine grain MTN path hitless resizing mechanism.
Amendment 4 adds a new Appendix VI to describe CBR client bit mapping including AMP and GMP, it also updates Table A.1 to define PT value for fgCPU.