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电子交换机是我国新建发展起来的一种电话交换设备.一九六八年,邮电部第一研究所和738厂合作,搞出了第一台20门船用电子交换机.一九七一年,738厂试制的200门笛簧准电子交换机在北京新华印制厂安装使用.一九七二年三月.江 苏省电信器材三厂生产的100门长市合一专用小交换机在南京市电信局和扬州市电信局正式投产使用.同年四月,上海市话局设备四厂研制的100门全电子交换机在上海天山路支局投入使用.七三年八月,江苏省电信器材三厂试制的1000门准电子交换机在连云港市局开通使用.七四年七月,512厂研制的500/1000门准电子交换机在天津丁字沽支局开通使用.这些试验局的开通,为我国电子交换机的发展打下了良好的基础.
The electronic exchange is a kind of telephone exchange equipment newly developed in China. In 1968, the First Research Institute of the Ministry of Posts and Telecommunications cooperated with the 738 factory and produced the first 20 marine electronic exchanges. In 1971, 738 The 200-thick reed quasi-electronic switch manufactured by the factory was installed and used in Beijing Xinhua Printing Plant. In March 1972, the 100 long-city-owned private branch exchanges produced by the third plant of Jiangsu Telecom Equipment Co., Ltd. were established in the Nanjing Telecommunications Bureau. The Yangzhou City Telecommunications Bureau was formally put into operation. In April of the same year, 100 full-electronic switches developed by the Shanghai Municipal Bureau of Equipment No. 4 Plant were put into use on the Shanghai Tianshan Road Sub-branch Bureau. In July and August, the 1,000th standard for the trial production of the third telecommunications equipment factory in Jiangsu Province. The electronic exchange was opened and used in the Lianyungang City Bureau. In July 1974, the 500/1000 electronic electronic exchange switch developed by the 512 factory was opened and used in the Tianjin Dingzi Sub-branch Bureau. The opening of these test bureaus laid a good foundation for the development of electronic exchanges in China. basis.