Recommendation ITU-T G.798 specifies both the components and the methodology that should be used in order to specify the optical transport network (OTN) functionality of network elements; it does not specify individual optical transport network equipment. Edition 7.0 of this Recommendation includes the text of Amendments 1, 2, 3 and 4, as well as Corrigenda 1 and 2 to Edition 6.0 of this Recommendation, the addition of the ODUkP to ETH adaptation function using Idle Mapping Procedure (IMP) and a number of editorial enhancements.