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HJ905交换机因不具备计费功能,不能适应目前电话通信网的发展,而这种用户交换机由于价格低廉、工作稳定可靠,又可无人值守而受到用户的普遍欢迎.因此为这种交换机加装计费系统成为许多使用单位的迫切要求.近年来,军内外均有人研制这种计费系统,但许多研制人员都感到由许许多多继电器组成的复杂电路上采集计费信息是难点.笔者在此提供所设计的两种采集方案,第一种方案经实验室运行,采集信息良好可靠;第二
HJ905 switch because they do not have billing capabilities, can not adapt to the current development of telephone communications network, and this user switch due to low prices, stable and reliable, but also unattended by the user’s universal welcome.Therefore, installation of this switch Billing system has become an urgent requirement for many users.In recent years, both inside and outside the military to develop such a billing system, but many researchers feel that the complex circuit consisting of many relays to collect billing information is difficult. This provides the design of the two acquisition programs, the first program run by the laboratory, the collection of information is good and reliable; the second