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第三节 总线网的实现——Ethernet 典型的总线形网络有Omininet,Ethernet,C-net-Z-net等多种产品。其中Ethernet应用最多,它县XEROX公司于1975年研究成功的,1980年9月由DEC,Intel,XEROX三公司(DIX)共同宣布了修改的Ethernet规范,这是世界上第一个局部网络标准,并吸收作为IEEE802.3的基础。按此规范制作的产品较多,但实现方法不尽相同,功能上也有差别。我们以Ethernet规范为基础来说明Ethernet的结构、工作原理及性能。 一、Ethernet的体系结构和工作原理 1980年的DIX Ethernet规范规定网络运行速率为10Mbit/s,规范本身仅涉及OSI/RM的物理层和数据链路层,目标是力求低成本、高速率、数据通道具有兼容性。Ethernet是由体系结构和典型实现接口两部分来定义的,示于图2-10。体系结构包
The third bus network to achieve - Ethernet typical bus network Omininet, Ethernet, C-net-Z-net and other products. One of the most Ethernet applications, its county XEROX company successfully studied in 1975, in September 1980 by DEC, Intel, XEROX three companies (DIX) jointly announced the revised Ethernet specification, which is the world’s first local network standards, And absorbed as the basis of IEEE802.3. According to this specification to produce more products, but the methods are not the same, there are functional differences. We based on the Ethernet specification to illustrate the structure of the Ethernet, working principle and performance. First, the Ethernet architecture and working principle The 1980 DIX Ethernet specification provides the network operating speed of 10Mbit / s, the specification itself involves only the OSI / RM physical layer and data link layer, the goal is to seek low-cost, high-speed, data Channels are compatible. Ethernet is defined by the architecture and the typical implementation interface in two parts, as shown in Figure 2-10. Architecture Package