ABSTRACT
TTEthernet is the industrial further development of the academic TT-Ethernet research [179], conducted within a joint research project1 between the Vienna University of Technology and TTTech Computertechnik AG. The main objective of the academic project has been the integration of time-triggered with event-triggered messages on a single physical Ethernet network: As event-triggered messages are not
outgoing ports in a network switch. The solution proposed within the academic TTEthernet project has been a preemptive switch. This TT-Ethernet switch [315] identifies the reception of a time-triggered message based on an identifier within the message and preempts all event-triggered messages under transmission to free the outgoing ports for the time-triggered message. The merit of this solution is twofold: first the switch latency for time-triggered messages is constant with negligible error and, secondly, the switch can be kept almost free from additional configuration data.
