OCIT interfaces are the basis of an open system architecture
They focus on standardized connections between distributed central and distributed components, such as subsystems, tools and field devices. With the use of Internet technology, they enable the construction of traffic management systems and system-wide networks, which include field devices and control panels.
The OCIT definitions specify system architecture, rules, OCIT protocols, functions, and transfer protocols.
So far, the following interface areas have been defined in the overall traffic control system: