The transmission network (24) uses a number of intermeshed optical conductors (11,12) for transmission of digital light pulses. The pulses represent the control signals provided by the control elements fed to the network (24) via signal processors (10) imcorporating a mixer (15) and information systems (16,17,18). The energy supply for the transmission network (24) uses a number of alternate energy sources, e.g. the aircraft engine, as auxiliary turbine, a slipstream turbine or an electric battery. The sources are switched into the network via three redundant coupling stages under control of respective monitoring and switching devices and a central microprocessor monitoring and switching stage coupled to the network.