This part of ÖVE/ÖNORM EN 61375 specifies the data communication network inside a Consist based on Ethernet technology, the Ethernet Consist Network (ECN). The applicability of this part of ÖVE/ÖNORM EN 61375 to the Consist Network allows for interoperability of individual vehicles within Open Trains in international traffic. This part of ÖVE/ÖNORM EN 61375 may be additionally applicable to closed trains and Multiple Unit Trains when so agreed between purchaser and supplier.