通信电缆断点故障自动检测报警电路的设计

Design of the Automatic Detection and Alarm Circuit for Breakpoint Fault of Communication Cable

针对通信电缆经常发生中断故障这一情况,为及时准确地判断电缆的断路故障,设计了一种基于电容法测距的电缆断点自动检测报警电路。该电路由单稳态电路、单片机以及语音芯片构成,实现了对通信电缆断点的实时检测及报警;此外,通过串口与客户端相连,电路可方便地进行报警电话的设置和报警语音的录制。该电路可以比较精确地测量出电缆断点离检查点的距离,为电信运营提供了一种性价比较高的电缆防盗报警装置。

The problem of breakpoint fault often occurs in communication cables.To precisely judge such fault in time,the automatic detection and alarm circuit based on capacitance distance measurement has been designed.The circuit is composed of monostable trigger,single chip computer,and voice chip.Automatic real-time breakpoint detection and alarm of communication cable are implemented;and clients are connected through serial port to set phone numbers and record voice alarm.The circuit can precisely detect the distance between breakpoint and the test point;it provides the higher cost effectiveness alarm instrument for telecommunication operation for preventing cables to be stolen.