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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。
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公开(公告)号：US4071692A
公开(公告)日：1978-01-31
申请号：US730876
申请日：1976-10-08
申请人： Donald A. Weir , Eric S. Usher , George A. Howells
发明人： Donald A. Weir , Eric S. Usher , George A. Howells
CPC分类号： H04L25/4925 , H04L25/45 , H04L25/4923
摘要： Intelligence is conveyed in a PCM bit stream form with alternate bits being inverted. Additional information is conveyed by violations of the alternate bit rule so that two successive bits have the same polarity. Prior to being coupled to the alternate mark inversion coder a pseudo-random bit stream is mixed by binary addition without carry to the intelligence bit stream to maintain low DC level in the transmitted mixed bit stream and to maintain bit transitions relatively high.
摘要翻译： 智能以PCM比特流形式传送，其中交替位被反转。 通过违反替代位规则来传达附加信息，使得两个连续位具有相同的极性。 在耦合到替代标记反转编码器之前，通过二进制加法将伪随机位流混合到智能比特流中以维持所发送的混合比特流中的低DC电平并保持比特转换相对较高。
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公开(公告)号：US4104488A
公开(公告)日：1978-08-01
申请号：US798415
申请日：1977-05-19
申请人： Donald A. Weir , Anthony W. Sweet
发明人： Donald A. Weir , Anthony W. Sweet
CPC分类号： H04M19/026 , H04M3/2272
摘要： Telephone subscriber line circuits and an all-electronic telephone exchange are described wherein Hall effect devices are incorporated to detect line looping, dialing and ring-trip.
摘要翻译： 描述了电话用户线路电路和全电子电话交换机，其中并入有霍尔效应设备以检测线路环路，拨号和环路跳闸。
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