摘要
电话机报警系统主要由集中监控报警终端、多路采集设备、单路采集设备、报警装置以及短信收发器等部分组成。电话机报警系统的主要任务是实现对话机非法移动检测、脱机检测、线路故障检测及报警。此系统采用的两种关键技术即脱机、线路故障监测技术和防移动检测技术来达到对保密电话机起到监控目的。其中脱机、线路故障监测技术中主要采用环路电流模式和注入高频信号模式来实现,而防移动检测技术采用贴标签来实现。
The phone warning system is mainly composed of telephone switching system,multichannel collection equipment,monochannel collector,centralized monitoring and warning terminal,message transceiver and warning facility etc.The phone warning system principally detects and warns the illegal movement,off-line and circuit breakdown of a telephone.This system,with the off-line and circuit breakdown monitoring technology and anti-movement detection technology,implements the monitoring of security telephone.The off-line and circuit breakdown monitoring technology is realized by circulating current mode and in-put high-frequency signal mode.While the anti-movement monitoring technology by tagging.
出处
《通信技术》
2011年第5期63-64,67,共3页
Communications Technology
关键词
脱机
非法移动
环路电流模式
注入高频信号模式
off-line
illegal movement
circulating current mode
in-put high frequency signal mode
