本文首先描述了实时系统与一般系统的区别，并研究了实时系统设计的基本原理以及实时系统的基本结构。
Firstly, this paper introduces the differences between Real-Time system and general purpose system and the principles and structures of real time system.
实时系统有强实时系统和弱实时系统两种。
There are two different real-time systems: hard real-time system and soft real-time system.
因此也不能完全满足电铁分布式监控系统网络通讯的实时性要求。本文通过分析电铁实时监控系统的结构及其网络通讯的特点，提出在电铁实时监控系统中使用组播的通讯方式。
The structure and the feature of the real-time monitoring system's network were analyzed, so multicast as the main communication way of the real-time monitoring system is put forward here.
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