This thesis covers the process of developing a network management system simulator with support for northbound communication over the CORBA-based protocol TMF814. The simulator allows the user to import real data from an existing network management system. The user can view and configure the data through a GUI. The simulator acts as a TMF814 server for clients on higher management network levels. Much of the focus in this project lies on the architecture's modularity, which can be divided into three areas: a graphical user interface, a northbound interface and a database interface.<br> The intention of the final product is to facilitate TMF814 integrations, but parts of the code can be re-utilized for multiple purposes. Modules can be attac...