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首页> 外文会议>Factory Communication Systems, 2002. 4th IEEE International Workshop on >Switched Ethernet for real-time industrial communication: modelling and message buffering delay evaluation
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Switched Ethernet for real-time industrial communication: modelling and message buffering delay evaluation

机译：用于实时工业通信的交换式以太网：建模和消息缓冲延迟评估

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摘要

Switched Ethernet is now considered as an attractive enabling technology for supporting factory communication needs. This paper deals with the modelling of an Ethernet switch and the performance evaluation of its real-time features. For multiple priority periodic and single priority aperiodic input traffic, methods for calculating respectively the worst case buffering delay and buffering delay probability distribution are given, allowing thus to estimate both hard real-time and soft real-time guarantees. Moreover for aperiodic traffic, Binomial input is compared to the Poisson one and we numerically showed that the Poisson case could be used as an approximation model to upper bounds of the buffering delay of the actual switch. This allowed us to further consider the priorities for buffering delay evaluation using classic results of M/G/1 queue.
机译：交换以太网现在被认为是满足工厂通信需求的有吸引力的使能技术。本文讨论了以太网交换机的建模及其实时功能的性能评估。对于多优先级周期性和单优先级非周期性输入流量，给出了分别计算最坏情况缓冲延迟和缓冲延迟概率分布的方法，从而可以估算硬实时和软实时保证。此外，对于非周期性流量，将二项式输入与Poisson输入进行了比较，我们通过数字显示了Poisson情况可以用作实际开关的缓冲延迟上限的近似模型。这使我们可以进一步考虑使用M / G / 1队列的经典结果进行缓冲延迟评估的优先级。

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