摘要
本文介绍了交换式以太网的一般原理、拓朴结构和工作方式以及长话营收网的组建方式。详细介绍了该广域网上使用的各种技术设备和连接方式，包括交换集线器、通信服务器和HDSL、DDN等传输设备以及TCP／IP、IPX／SPX协议和它们之间的兼容。
This paper describes the general principle and topological structure of switching-type ethernet as well as estab1ishment of Beijing long-distance telephone business income WAN. Describes in detail the technical equipments and connection type used in this WAN, including, switehing hub, communication servers, HDSL,DDN, TCP/IP and IPX/SPX protocols, as well as the compatibility between them.
