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A switched ethernet protocol for hard real-time embedded system applications Alimujiang, Yiming Eisaka, Toshio Eisaka Toshio open access Electronic version of an article published as Journal of Interconnection Networks, Volume 6, Issue 3, 2005, pages 345-360 https://doi.org/10.1142/S0219265905001460 c 2005 World Scientific Publishing Company https://www.worldscientific.com/worldscinet/join communication protocol Ethernet hard real-time switch traffic scheduling This paper presents a protocol to support hard real-time traffic of end-to-end communication over non real-time LAN technology. The network is set up with nodes and switches, and real-time communication is handled by software (protocol) added between the Ethernet protocols and the TCP/IP suite. The proposed protocol establishes a virtual circuit based on admission control and manages hard real-time traffic to bypass the TCP/IP stack. This makes considerably reduce the dwell time in the nodes, and increase the achievable data frame rate. After the bypassing, traffic schedule is performed according to dynamic-priority EDF algorithm. The work does not need any modifications in the Ethernet hardware and coexists with TCP/IP suites, and then the LAN with the protocol can be connected to any existing Ethernet networks. It can be adopted in industrial hard real-time applications such as embedded systems, distributed control systems, parallel signal processing and robotics. We have performed some experiments to evaluate the protocol. Compared to some conventional hard real-time network protocols, the proposed one has better real-time performances and meets the requirements of reliability for hard real-time systems. World Scientific Publishing 2005-09 eng journal article AM https://kitami-it.repo.nii.ac.jp/records/8663 https://doi.org/10.1142/S0219265905001460 1793-6713 Journal of Interconnection Networks 6 3 345 360 https://kitami-it.repo.nii.ac.jp/record/8663/files/A switched ethernet protocol for hard real-time embedded system applications.pdf application/pdf 2.1 MB 2018-10-05