NTT NTT West NTT 1Finity Ciena This document provides YANG data models to access to and control CMIS for controlling pluggable Digital Coherent Optics transceivers equipped in a router or a switch from outside. CMIS has custom pages which enables to be defined by the module vendor for its own usage, and allows to extend the uses of the optics devices. These YANG modules also allow the utilization of CMIS custom pages as a generic control mechanism.