【摘要】 系统地介绍了以太网的基本概念、介质接入控制和物理层标准规范、以太网信号的帧结构、网络硬件设备、网络组成及主要的性能,以及以太网信号在PDH、SDH/SONET中的传输等等。本部分为介质接入控制方法和物理层性能的标准规范。在介质接入控制方法方面介绍了半双工和全双工以太网两种工作模式,在物理层性能标准规范方面分别介绍了1Mbit/s、10Mbit/s、100Mbit/s、1000Mbit/s和10000Mbit/s以太网的物理层性能标准规范。更多还原

【Abstract】 The paper systematically introduces the basic concept of Ethernet,Ethernet m edia access control,physical layer performance standard,Ethernet signal frame structure,network hardware equipment ,network constitution and main performan ces and Ethernet signal transmitted over PDH,SDH/SONET et al.This part descri bes the media access control method and physical layer performance standard,int roduces the two kinds of semi-duplex and full-duplex Ethernet working modes i n media access control method and also separately presents1Mbit/s,10Mbit/s ,100Mbit/s,1000Mbit/s和10000Mbit/s Ethernet physical layer per-formance sandard in physical layer performance standard.更多还原