Recommendation ITU-T G.7711/Y.1702 specifies a core information model (IM) of transport resources. The IM is applicable to the management and control of transport networks regardless of whether they utilize traditional operation support system (OSS) management, an automatically switched optical network (ASON) control plane or a software-defined networking (SDN) controller to configure transport connectivity. The model is also applicable regardless of the technology of the underlying transport network. Furthermore, the applicability of the IM is independent of the ultimate protocols that will be used in the management and control interfaces. The 2016 edition of this Recommendation has changed the document structure, added an "experimental" address structure to the foundation model, changed the name of TopologicalEntity to ForwardingEntity, incorporated ForwardingConstruct (FC) under ForwardingEntity and considers FC as closely related to topology, added the resilience model, added the equipment model and added the Specification model. The 2018 edition of this Recommendation has enhanced the Forwarding & Termination, Foundation, Topology, Resilence, Equipment, and Specification models, and added the Control, Operations Pattern, Processing Construct, Constraint Domain models, and also updated the model description Appendixes. Appendix IV.6 "Synchronization management model" and IV.7 "Media management model" have been remove from this edition as they are being covered by separate Recommendations