A synchronous computer-controlled communications network is provided that includes an Ethernet network switch; one or more avionics computers communicatively coupled in the synchronous computer-controlled communications network, and one or more end systems communicatively coupled in the synchronous computer-controlled communications network, wherein each of the one or more end systems, wherein the synchronous computer-controlled communications network is synchronized by a synchronization schedule that provides a common start time of a Major Time Frame or the start of a particular partition of the one or more avionics computers based on a user configuration, wherein a first avionics computer of the one or more avionics computers is configured to transmit an Event Synchronous Frame (ESF) to the Ethernet switch, wherein the ESF indicates that the first avionics computer is ready to integrate in a configured synchronous computer-controlled communications network.