An element management system (EMS) manages one or more of a specific type of network elements (NEs). An EMS allows the user to manage all the features of each NE individually, but not the communication between NEs - this is done by the network management system (NMS). NEs expose one or more management interfaces that the EMS uses to communicate with and to manage them. These management interfaces use a variety of protocols including SNMP, TL1, CLI, XML, and CORBA.
