论文部分内容阅读
以太网(Ethernet)是一种性能比较好的本地网络:它的传输速率较好,可达1～10 Mbps;作用距离在本地网中相对较远,可达10公里;结构简单,以一根共享总线——电缆连接,像闭路电视一样敷设和使用。改接和扩充都很方便。其结构图如图1所示。以太本地网的工作原理采用分布控制的竞争式方式,网中没有主控站。每个工作站是一个智能接口,它能对总线状态进行测试,称之为载体检测。测试到总线空闲时,工作站才能发送信息。在发送时由于没有主控站存在,所以是自由
Ethernet is a good performance of the local network: its transmission rate is good, up to 1 ~ 10 Mbps; the role of the distance in the local network relatively far, up to 10 km; simple structure to a Shared bus - cable connection, like CCTV laying and use. Adaptation and expansion are very convenient. The structure shown in Figure 1. The working principle of Ethernet local area network using distributed control of competition, there is no master control station. Each workstation is an intelligent interface, it can test the bus status, called carrier detection. Workstations can send messages when it is tested that the bus is idle. In the absence of master control station exists, it is free