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公开(公告)号:US4158170A
公开(公告)日:1979-06-12
申请号:US814608
申请日:1977-07-11
CPC分类号: H04M19/026 , H04M3/2272
摘要: A line current detector for use in telecommunications systems to monitor line condition. The detector uses an optical or photo electric device whose input is modulated by line current. A photo transistor, electrically isolated from the line, senses the modulated output of the detector to produce a condition responsive output. The optical device is preferably a liquid crystal device. The output sensor is isolated from the line.
摘要翻译: 用于电信系统中的线路电流检测器,用于监视线路状况。 检测器使用其输入由线路电流调制的光学或光电器件。 与线路电隔离的光电晶体管感测检测器的调制输出以产生响应输出的条件。 光学装置优选为液晶装置。 输出传感器与线路隔离。