Recommendation ITU-T G.798.2 specifies both the components and the methodology that should be used in order to specify the optical transport network (OTN) media layer and non-associated overhead functionality of network elements; it does not specify individual optical transport network equipment. Recommendation ITU-T G.798.2 specifies both the components and the methodology that should be used in order to specify the optical transport network (OTN) media layer and non-associated overhead functionality of network elements; it does not specify individual optical transport network equipment.