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一、引言IEEE802局部网络标准规定了两种媒质访问协议,CSMA/CD和Token-passing。后一种又进一步分成Token-Bus和Token-Ring。存在多种媒质访问协议的原因在于实际需要和应用的多样性。目前,关于媒质访问协议的标准化存在着三种趋势:
I. Introduction IEEE802 local network standard specifies two media access protocols, CSMA / CD and Token-passing. The latter is further divided into Token-Bus and Token-Ring. The reason for the existence of multiple media access protocols is the diversity of practical needs and applications. At present, there are three trends regarding the standardization of media access agreements: