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为缓解通信供需矛盾，在现有的纵横制交换机设备基础上，采用了ＳＯＰＨＯ－Ｓ全时分数字程控交换机为扩容设备。文中介绍了这两种机型接口电路改进的方法。
In order to alleviate the contradiction between supply and demand of communications, the SOPHO-S full-time digital program-controlled switchboard was adopted as a capacity expansion device based on the existing crossbar switchboard equipment. This article describes the improvement of these two models of interface circuit methods.