程控用户交换机 meaning in English

pbx:private brancn exchange

Specification for design of spc pabx engineering in industrial enterprises
工业企业程控用户交换机工程设计规范
Abstract : this paper analyses all factors that influence the telephone connection of program - controlled customer exchangers and puts forward measures for raising the telephone connection rate
文摘:分析了影响程控用户交换机电话接通率的各种因素，并结合实际情况指出提高电话接通率的具体措施。