The invention relates to a method for the redundant transmission of messages in a distributed real-time system. The real-time system comprises two or more computing nodes (101-108) and one or more star couplers (201-209). The computing nodes (101-108) are connected to the star couplers (201-209) by means of bidirectional communication lines (301, 302, 303), and the star couplers (201-209) are connected to one another by means of bidirectional communication lines (310). The star couplers (201-209) connected by means of the communication lines (310) form a network infrastructure (200), wherein one or more star couplers (201-209) of the network infrastructure (200) carry out one or more activity rasters (1000). An activity raster (1000) consists of alternating active phases (502) and rest phases (501), and precisely one activity raster (1000) is assigned to each message transmitted in the network infrastructure. The invention further relates to an infrastructure and to a real-time system with such a network infrastructure.