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Signal transmission system of subscriber circuit

阅读:334发布:2020-11-12

专利汇可以提供Signal transmission system of subscriber circuit专利检索,专利查询,专利分析的服务。并且PURPOSE:To decrease the number of operating switches, by using a feeding circuit and a reversing switch in common for the transmission of a silent signal and the reverse feeding and using an FET as a ringing signal transmission switch. CONSTITUTION:A switch at a DC power supply 20 of a silent signal transmission circuit is formed with a field effect transistor(TR) 102 and a switch of other AC power supply 21 is constituted with a field effect TR101. In transmitting the ringing signal, the reversing switches 12-15 are turned off and the field effect TRs 101 and 102 are turned on. Further, in transmitting the silent signal, the switches 14, 15 are turned on and the switches 12, 13 are turned off and the signal is transmitted from the feeding circuit 11. The number of switches is decreased by this constitution.,下面是Signal transmission system of subscriber circuit专利的具体信息内容。

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