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    • 1. 发明专利
    • Noise preventing circuit
    • 噪音预防电路
    • JPS5925493A
    • 1984-02-09
    • JP13475082
    • 1982-08-03
    • Fujitsu LtdHitachi LtdNec CorpNippon Telegr & Teleph Corp Oki Electric Ind Co Ltd
    • MANABE KAZUMASAISHIKAWA ISAOTEZUKA TAKAOSHIBANO SHIYOUGOKUBO MASAHIDE
    • H04Q3/54H04Q3/00
    • H04Q3/0016
    • PURPOSE:To reduce a noise quantity generated by the variation of switching voltage, by providing a trunk circuit which is equivalent to the trunk circuit at the other terminal side of a channel of an intra-office device before switching at the preceding stage of a transmitting/receiving device of the intra-office device. CONSTITUTION:Th impedance Z1 of the channel at the side of a transmitting/ receiving device B passing through a switch contact sw from a transmitting/ receiving device A is set equivalent to the impedance Z2 of the channel at the side of a transmitting/receiving device C passing through the active side of the contact sw from the device A. As a result, it is possible to suppress the voltage variation to the device A which receives a reduced effect of electrical conditions following the channel passed through the contact sw from the device A for an intra-office device TRK which supplies power to the device A and when the channel is switched to both devices A and C by the function of the switch sw during communication of information between devices A and B. This reduces the switching noises generated at the side of the device A and ensures a stable supply of power.
    • 目的:为了减少由开关电压的变化产生的噪声量,通过提供一个干线电路,该干线电路在切换前一阶段的发送之前提供与在办公室内设备的信道的另一终端侧的中继电路相当 /接收设备。 构成:通过来自发送/接收装置A的开关触点sw的发送/接收装置B侧的信道的阻抗Z1被设置为等于发送/接收装置侧的信道的阻抗Z2 C通过来自设备A的触点sw的有效侧。结果,可以抑制对从设备通过触点sw的通道之后的电气条件的减小的影响的装置A的电压变化 A用于向设备A供电并且当通过设备A和B之间的信息通信期间通过交换机sw的功能将信道切换到设备A和C两者的局部设备TRK。这减少了产生的交换噪声 在设备A的侧面,并确保稳定的电力供应。
    • 2. 发明专利
    • Fault supervisory circuit
    • 故障监控电路
    • JPS60192451A
    • 1985-09-30
    • JP4863684
    • 1984-03-14
    • Fujitsu LtdHitachi LtdNec CorpNippon Telegr & Teleph Corp Oki Electric Ind Co Ltd
    • KAWAKATSU HIDEOSUZUKI YASUYUKIKIDA MAMORUSAKURAI TAKEOSHIBANO SHIYOUGO
    • H04M3/22H04M3/28
    • H04M3/28
    • PURPOSE:To detect earthing, positive abnormal voltage and negative abnormal voltage and also crosstalk between lines by providing a supervisory circuit capable of alarming having a power supply of the same level as each class identification power supply corresponding to each class identification power supply, detecting a voltage when a voltage different from the voltage of each power supply is inputted including earthing. CONSTITUTION:A +13V or -13V low battery voltage is applied to polar relays LPB, LNB via a rectifier circuit comprising a bridge consisting of diodes D respectively, a +50V or -48V high battery voltage is fed respectively to polar relays HPB and HNB via a resistor R. An alarm lamp LPBAL indicates a faulty state of a line (LPB) that a voltage other than +13V, that is in excess of +13V or not reaching +13V or earthing exists positively. Further, an alarm lamp HPBAL indicates a fault of a line (HPB) that a voltage other than +50V, that is a positive or negative voltage not reaching +50V exists.
    • 目的:通过提供能够报警的监控电路来检测接地,正异常电压和负异常电压以及线路之间的串扰,该监控电路具有与每个类别识别电源相对应的每个类别识别电源具有相同电平的电源,检测 输入与各电源的电压不同的电压时的电压,包括接地。 构成:分别通过包括由二极管D构成的桥的整流电路将极小的继电器LPB,LNB施加A + 13V或-13V的低电池电压,将+ 50V或-48V的高电池电压分别馈送到极性继电器HPB和HNB 报警灯LPBAL指示线路(LPB)的故障状态,超过+ 13V或不达到+ 13V或接地的+ 13V以外的电压或接地存在。 此外,报警灯HPBAL表示存在线路故障(HPB),即+ 50V以外的电压,即正或负电压未达到+ 50V。