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复杂的实时系统往往由多台计算机组成,在构造多机实时系统时,网络数据实时传输是整个系统正常可靠运转的关键,也一直是个难题。所谓网络数据实时传输就是指网络上各结点间的数据传输时间是确定的,即可预测的。也就是说我们可以判定最坏情况下数据从一个结点传送到另一个结点所需的时间。而具有这一特性的网络我们称之为实时网络。实时网络是多机实时系统的重要组成部分。
Complex real-time systems are often composed of multiple computers. In the construction of multi-machine real-time systems, real-time transmission of network data is the key to the normal and reliable operation of the entire system. It has also been a challenge. The so-called real-time transmission of network data refers to the network nodes on the data transmission time is determined, that is, predictable. This means that we can determine the time required to transfer data from one node to another in the worst case. The network with this feature we call real-time network. Real-time networks are an important part of multi-machine real-time systems.