Supplement 72 to ITU-T G-series Recommendations provides supplemental information to Recommendation ITU T G.876, Management requirements and information model for the optical media network and Recommendation ITU-T G.7711/Y.1702, Generic protocol-neutral information model for transport resources. It provides various examples of the use of the core information model, defined in Recommendation ITU-T G.7711/Y.1702 to model optical media structures.