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程控用户交换机是国家公用网的一个重要组成部分，是各地通信专网的核心和中枢。随着市场经济的快速发展和人们对信息交流的日益增加，它的地位和作用也越来越显得重要。一旦发生故障，将使部分地区的通信暂时陷于瘫痪状态。因此，加强对程控用户交换机的管理和维护就显得十分
Program-controlled user switches is an important part of the national public network, is the core and central communications around the network. With the rapid development of market economy and people’s increasing exchange of information, its status and role become more and more important. In the event of a breakdown, communications in some areas will temporarily be paralyzed. Therefore, to strengthen the program-controlled user switch management and maintenance is very significant