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In order to analyze the performance indicators of the train network and explore the factors affecting the performance indicators of the train network, the model of Ethernet is improved according to the three-layer modelling mechanism of OPNET. The topology model, node model, process model, data packet format model and link model of the multi-marshalling Ethernet backbone network are built, and the links of the network are made under different load conditions. The simulation results show that the high-speed EMU train network based on ARCNET protocol can meet the requirements of the train communication network in terms of real-time and reliability, but the network has the disadvantage of low data transmission rate. Therefore, the backbone network of Ethernet train has great engineering application value in the train network. [ABSTRACT FROM AUTHOR]

Abstract: The objective of this paper is to introduce a reference model of BACnet-based fire detection and monitoring system using MS/TP and ARCNET protocols. The reference model is designed to satisfy the requirements of response time, survivability and flexibility. The reference model is operated on the basis of BACnet, a standard communication protocol for building automation systems. In this study, a simulator for the reference model of fire detection and monitoring system was developed. Using the simulator, this study examined the validity of the reference model proposed in this study. This study also evaluated the performance of the BACnet-based fire detection and monitoring system in terms of network-induced delay. Simulation results show that the reference model satisfies the requirements of fire detection and monitoring system. [Copyright &y& Elsevier]