一、前言数字交换机的结构按功能可分为连接、控制及操作维护管理等三部分。连接部分就是通过交换机建立信息通道,具有交换和传输功能,交换网络和包含用户线接口电路的交换终端属于这部分。控制部分的功能包括交换连接处理、资源处理、服务处理和信令处理。操作、维护、管理部分的功能是建立呼叫和监视以外的功能,例如测试、诊断功能等。 I. Introduction The structure of the digital switchboard can be divided into three parts: connection, control, operation and maintenance management. The connection part is through the exchange to establish information channels, with switching and transmission functions, switching networks and switching circuits that contain subscriber line interface belong to this part. The functions of the control part include exchange connection handling, resource handling, service handling and signaling handling. The functions of the operation, maintenance and management part are to set up functions other than calling and monitoring, such as testing and diagnosing functions.