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近年来,出现了帧中继(Frame Relay)、光纤分布式数据接口(FDDI)、异步传输模式(ATM)等面向高带宽应用需求的网络传输技术,其中最引人注目的是ATM,它是宽带综合业务数字网(B-ISDN)的基础。但是,使用最为广泛的局域网具有与ATM根本不同的特征,进行ATM的局域网仿真就成为该传输技术最终得以广泛应用的关键。 一、传统局域网与ATM的主要差别 传统LAN的某些重要特征是与ATM技术相冲突的,不能被ATM直接支持,因而必须进行仿真。这些相冲突的特征主要有两个: 1.帧长度 LAN的协议数据单元(PDU)长度可变,最长可达18kB,ATM则采用固定长度信元,每个信元53字节。所以,LAN的
In recent years, network transmission technologies such as Frame Relay, Fiber Distributed Data Interface (FDDI) and Asynchronous Transfer Mode (ATM) have emerged for high-bandwidth applications. The most notable is ATM, which is Broadband Integrated Services Digital Network (B-ISDN). However, the most widely used LAN has fundamentally different characteristics from ATM. Therefore, the simulation of ATM LAN becomes the key to the wide application of this transmission technology. First, the main difference between the traditional LAN and ATM Some of the important features of the traditional LAN is in conflict with the ATM technology, can not be directly supported by the ATM, which must be simulated. These conflicting features are mainly two: 1. Frame Length LAN protocol data unit (PDU) variable length, up to 18kB, ATM fixed-length cells, each cell 53 bytes. So, LAN’s