令牌总线和令牌环中的优先访问技术

The Priority Access Control In Token Bus And Token Ring

优先访问技术是指在局部计算机络网中一些用户因传送某些特殊信息的需要可以获得对访问媒质的优先权,以保证获得良好的传输延迟特性。有关优先访问控制的一些基本理论以及在局部计算机网络中的实现方法,已有一些文章进行过分析讨论。但多数文章是涉及用 CSMA/CD 带冲突检测的载波监听多址访问技术中的优先访问技术,而对令牌总线和令牌环中所采用的优先访问技术讨论尚少。本文将重点分析和讨论令牌总线和令牌环网络中的优先访问技术的原理及性能。由此,可以深入地了解各种不同的媒质访问技术中所采用的优先访问技术的特点。

The priority access control means some subcribers can obtain priority access night to medium in order to transmit any special information in Local area net- work。It can guarantee to get better transmission delay for subcribers.Some basic theory and implement method of the priority access has already had a lot of dis- cussion,but the most of paper have dealt with the priority access control in the CSMA/CD。There were Only a few paper have dealt with the priority access con- trol in the Token bus and Token ring,This paper will do detailed discusson and analysis about the principle and performance of the priority access Control in the Token bus and Token ring,This paper will Contribute to know Characteristics of the priority access control in the different medium access cohtrol.