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COPPLING SYSTEM FOR THE IMPLEMENTATION OF ADMISSION ON TELEVISION AND SERVICE PHONE LINES
COPPLING SYSTEM FOR THE IMPLEMENTATION OF ADMISSION ON TELEVISION AND SERVICE PHONE LINES
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机译:实现电话和服务电话线接入的耦合系统
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摘要
Apparatus is described for monitoring the state, e.g., with regard to polarity, of signal lines in a telecommunication system. An input circuit, by means of high resistances relative to the line resistance, connects the lines to a differential amplifier having a predetermined threshold of response. A component of the amplifier output is applied to the input so as to have a polarity opposite to that of a bias voltage coupled to the amplifier. A capacitive protective circuit connected between the signal lines provides a time delay thereby protecting against interference pulses.
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