 of converting to a common readable format. Mediation applications are usually used with most OSS system that take data from multiple elements or element management systems. When stan- dard interfaces are not used, change in network element brings in significant development to change the mediation system to support the new or changed element. Control commands and messages can be exchanged through the network data mediation solution. Most of the current mediation solutions are standards based to support the multiple northbound and southbound interfaces. In addition to formatting, some of the other functions performed by mediation system include parsing, correlation, and rule-based message handling. 42. Event management and correlation: Fault data is a critical source of infor- mation in automating management functionality. Predefined actions can be mapped to specific events to handle scenarios the same way it would be done by a network professional. Event management solutions display event records and take corrective actions for specific events. A network operator uses a sequence of events to identify a particular problem. Similarly, the event management system needs to collect and correlate events to identify the event pattern that maps to a predefined problem. Event management solutions collect data from multiple network elements. These events are filtered and the event is checked against specific event pat- terns for match. If the events can lead to a pattern, then such events are stored in a repository for reference. For example, if three SLA jeopardy events on the same service raises an e-mail to the operator, then each SLA jeopardy event or the event count needs to be stored. 43. Network design: These solutions help to develop a design model of new ele- ments to be included in a network and to design network configurations that are needed to support new services. First the network and its elements are modeled and simulated before assigning the design to appropriate systems that support the implementation. Ne