Subscriber line interface circuit is an important part of digital program-controlled switching system.
模拟用户线接口电路是数字程控交换系统的重要组成部分。
Turnout system is the vital line-switching system for the safe operation of medium-low speed maglev vehicles.
道岔系统是保证中低速磁浮列车安全运行的重要转线系统。
The influence of switching off branch on system nodal voltages and line loads is analyzed and the concept of security margin and its calculation formula are given.
分析了支路断开对系统节点电压及线路负荷的影响，给出安全裕度概念和计算公式。
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