ABSTRACT
Most element management systems are available in the market support management data collection from multiple network elements though they cannot be called a network management system. Hence an application is not necessarily a network management system just because it supports data collection from multiple NEs. The functionalities offered by the systems decide whether it is a network management system (NMS) or an element management system (EMS). Let us make this point clear with an example. A topology diagram in an EMS would have the nodes configured in the element while a topology diagram in an NMS will show all the configured network elements managed by the NMS. Again a fault management window on an EMS would show only the logs and alarms generated on the network element it is managing. The functionalities like fault correlation and decision handling based on events from various NEs are shown in an NMS.
