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全国及省内长途电话网基本是由S 1240长途交换机组成的。长途交换机是组成全国长途电话网的核心部分。为了更加充分地发挥这些长途局（TS）的龙头作用，有效地提高全网接通率指标，以便向用户提供包括ISDN在内的更优质的服务，全国及省内部分长途电话交换机相继由5X版E型机升版
National and provincial long distance telephone network is basically composed of S 1240 long-distance switch. Long-distance switches constitute the core part of the national long-distance telephone network. In order to give full play to the leading role of these long-distance offices (TSs) and effectively improve the whole network connection rate indicators in order to provide users with better services including ISDN, the national and some remote telephone exchanges in the province are successively composed of 5X E version of the machine version