数据通信基础第2页共33页编号：时间：2021年x月x日书山有路勤为径，学海无涯苦作舟页码：第2页共33页目录第一章数据通信系统.....................................................................................................................41.1数据通信系统组成............................................................................................................41.1.1数据终端设备（DTE）..........................................................................................41.1.2数据电路终接设备（DCE）..................................................................................51.1.3数据电路和数据链路............................................................................................51.1.4传输........................................................................................................................51.1.4.1传输信道....................................................................................................51.1.4.2传输方式....................................................................................................61.1.4.3多路复用....................................................................................................71.1.5接口........................................................................................................................71.2数据通信系统的性能指标................................................................................................81.2.1信息传输速率（Rb）.............................................................................................81.2.2码元传输速率（RB）.............................................................................................81.2.3频带利用率............................................................................................................81.2.4差错率....................................................................................................................9第二章OSI参考模型...................................................................................................................102.1通信协议的概念与层次结构..........................................................................................102.2OSI参考模型及各层功能................................................................................................112.2.1OSI参考模型........................................................................................................112.2.2各层功能..............................................................................................................112.2.2.1物理层（PH）..........................................................................................112.2.2.2数据链路层（DL）..................................................................................122.2.2.3网络层（N）............................................................................................122.2.2.4运输层（T）............................................................................................122.2.2.5会话层......................................................................................................122.2.2.6表示层......................................................................................................122.2.2.7应用层......................................................................................................
