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本文分析了工业局部网络结构中的主要问题。认为令牌环和令牌总线是工业局部网的主流结构形式,主从式总线和星形结构是它的补充形式。本文初步提出了局部网络的控制结构概念,以及有效位长度,无效位长度、视在位长度、位长度因素等概念。利用位长度因素,本文推导了令牌总线和令牌环的简单吞吐性能模型。根据这个模型及其它工程评价,本文提出了工业局部网的两种参考结构模式,并认为模式二对我国国情更具吸引力。
This paper analyzes the main problems in the industrial local network structure. The Token Ring and Token Bus are considered as the mainstream structure of the industrial local network. The master-slave bus and the star structure are its supplementary forms. This paper initially proposed the concept of control structure of local network, and the concepts of effective bit length, invalid bit length, apparent bit length and bit length. Using bit length, this paper deduces the simple throughput performance model of token bus and token ring. Based on this model and other engineering evaluations, this paper proposes two reference structure models for industrial local networks and considers Model II to be more attractive to China’s national conditions.