Subscriber line interface circuit is an important part of digital program-controlled switchingsystem.
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。
2
Turnout system is the vital line-switchingsystem 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。
3
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.