摘要
Abstract
Aims at the two typical communication system failures,analyzes the treatment process,puts forward the basic analysis thinks and treatment method for the failures of Synchronous Digital Hierarchy（SDH） and program control exchanger.关键词
同步数字传输系统/程控交换机/故障处理/通信系统Key words
SDH（Synchronous Digital Hierarchy）/program control exchanger/failure treatment/communication system分类
信息技术与安全科学
