EMS (Element Management System) A network management system (NMS) that manages one or more network elements (NEs) of a specific type, e.g., modems or multiplexers, and manufacturer. Multiple EMSs may be managed by a higher level NMS commonly known as a manager of managers (MOM) and as described in the layered telecommunications management network (TMN) model. See also MOM, network management, NMS, and TMN. |