拆线时，你必须清楚地做下记号。

You must make marks clearly when the wires are disconnected.

关机后应用放电棒对试品进行充分放电，再拆线。

After shut up the instrument, please use discharging rod to discharge the tested object fully, then dismantle the wire.

对引起交换机非正常拆线、用户非正常挂机的伪信今的产生原因作了初步分析，并针对这些原因提出了改进的措施；

This paper analyzes the cause of false signallings that result in abnormal ex-change disconnection, abnormal user off - hook, some ways against them is showed.