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一、城市小交换机的作用不容忽视在城市电话网的建设中,除了设置各种等级的市话交换局以外(如分局、汇接局、支局),还必须有一些用户小交换机。这些用户小交换机是市话网的重要组成部分,是实现全网技术经济优化的条件之一,它的地位和作用是不容忽视的。近年来,我国用户小交换机的数量迅速增长。据1983年底的统计,全国用户小交换机的数量为市话交换机的1.16倍,省会以上城市为1.86倍,大区中心以上城市为2.4倍。其发展
First, the role of urban small exchangers can not be ignored In the construction of the city telephone network, in addition to setting the various levels of local exchange (such as branch, tandem, branch), you must also have some small users switchboard. These user switchboards are an important part of the local telephone network and are one of the conditions for achieving technological and economic optimization of the entire network. Its status and role can not be ignored. In recent years, the number of users in our country has rapidly increased. According to the statistics of the end of 1983, the number of national user exchangers was 1.16 times that of local exchangers, 1.86 times that of provincial capitals and above, and that of cities above the center of the major cities was 2.4 times. Its development