A method of operating a transmission system (1) having a first network (2) and at least one second network (3) where data is exchanged in that data of the first network (2) is inputted between these at least two networks (2, 3) into duplication means (4), and the inputted data is transmitted wirelessly via at least two transmission paths (6, 7) using PRP to separator means (5) and forwarded from the separating means (5) to the connected second network (3), characterized in that the data is transmitted as data packets and each data packet is transmitted several times via the same transmission path (6, 7).