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Nowadays, switched Ethernet is considered as an attractive enabling technology for supporting industrial communication needs. However, because of some disadvantages, switched Ethernet requires some mechanisms for supporting real-time communication, which is the most important challenge in industrial communication. This paper suggests and proves the schedulability condition for hard real-time periodic messages on a switched Ethernet that are scheduled under EDF-based scheduling algorithm without any modification of original switches, thus they can be applied directly to industrial communication. The switched Ethernet operates based on the master-slaves principles and the synchronized model, and the transmission of real-time periodic messages will be handled by master node to fulfil their hard real-time requirements.