On the basis of the limitation of Media Access Control(MAC) which is adopted in control network commonly,a new MAC protocol —— Token-CSMA/CD is designed.Its control principle and implement method are studied.Finally,Token-CSMA/CD is simulated in computer.The result of simulation shows that Token-CSMA/CD is superior to Token Bus and CSMA/CD.%针对控制网络中常采用的媒体访问控制协议存在的缺陷,设计了一种新的媒体访问控制协议——Token-CSMA/CD协议。对其工作原理、实现方式进行了研究。最后,对混合协议进行了计算机仿真,Token-CSMA/CD的性能优于CSMA/CD和Token Bus。
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