By means of network calculus,switched ethernet based on FCFS and IEEE802.1P are analyzed in real-time behavior. The request and characteristic of industrial ethernet for process control and motion control in real-time are explained.

• 基于网络演算理论对FCFS调度和IEEE802.；1P调度的交换式以太网实时性进行了分析；根据用于过程控制和运动控制领域的工业以太网实时要求及特点对交换式以太网在工业实时性满足方面进行了具体说明。