Amendment 1 to ITU-T Recommendation G.798 (2012) completes the management interfaces of the optical modulation and wavelength multiplexing processes for support of WDM interfaces, to add a note to see the HAO capable ODUk to MPLS-TP adaptation function in G.8121, to add adaptation of multilane 40 Gigabit/s SDH signals with parallel interfaces (STL256.4) for mapping into LO OPU3, to add CM-XGPON and the Payload Types for clients bit-synchronously mapped into ODUflex to the ODUkP to CBRx adaptation functions, to add the ODU2eP to FC-1200 signal adaptation functions, to add Fibre Channel clients to Annex A, and to correct the Payload Type for SBCON/ESCON clients and the frequency tolerance of ODUflex signals.