A local area network with ordered bus access by low level token passing

Walter Wawer
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引用次数: 1

Abstract

In local area networks with token-controlled access to the physical medium, the access rights are passed from one station (or node) to another by transferring a token. There is only one token owner at a time which controls the packet generation onto the physical medium. Token-controlled systems are deterministic, in contrast with systems controlled by carrier sense multiple access with collision detection (CSMA/CD), and therefore worst case access times or transaction times can be defined, which is an important characteristic in distributed process control systems. In this paper a token-passing scheme is described which may be added below a commercially available data link controller with CSMA/CD control. The performance of the two access protocols is compared.

一种局域网络,通过低级令牌传递进行有序的总线访问
在使用令牌控制访问物理介质的局域网中,通过传输令牌将访问权从一个站点(或节点)传递到另一个站点(或节点)。每次只有一个令牌所有者控制物理介质上的数据包生成。与带有冲突检测(CSMA/CD)的载波感知多址控制系统相比,令牌控制系统具有确定性,因此可以定义最坏情况下的访问时间或事务时间,这是分布式过程控制系统的一个重要特征。本文描述了一种令牌传递方案,该方案可以添加到具有CSMA/CD控制的市售数据链路控制器下面。比较了两种访问协议的性能。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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