A concept of unifying the communications interface between heterogeneous ITS subsystems was presented in this paper. In its first part, it concentrates on causes for and consequences of having heterogeneous networks. Then it goes to present methods developed to counteract that phenomenon through the seven layer OSI model and the CORBA standard. In latter parts, two data exchange protocols in heterogeneous ITS networks were presented. In the context of their limitations, an original concept was developed using a shared database as a universal communication interface between different ITS systems.
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