管道系统大多采用共电式或磁石式交换机进行局内通讯和接转长途电话。为了保证长途电话的通话质量,本文以磁石交换机为例,从分析交换机和载波机通路入手,寻找一种切实可行的简易办法,以达到交换机与长途载波机通路的平衡工作状态。一、磁石交换机及共电式交换机交流通路的阻抗特性磁石式或共电式交换机用户表示器(灯 Most of the pipeline system uses a common or magnetic switch for intra-office communication and long distance calls. In order to guarantee the call quality of long distance calls, this paper takes the magnet switch as an example. Starting from the analysis of the switch and the carrier path, looking for a practical and easy way to achieve the balanced working state of the switch and the long-haul carrier path. First, the magnet switch and common-exchange circuit impedance characteristics of the exchange path Magnetism or common-mode switch user indicator (lamp