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    • 12. 发明公开
    • Selective ringing circuit for a telephone
    • 选择性的电话铃声电路
    • EP0210941A3
    • 1988-10-05
    • EP86630117
    • 1986-07-28
    • Del Monte, Philip JohnVanwey, Jackie Lee
    • Del Monte, Philip John
    • H04Q05/02
    • H04Q5/02
    • A selective ringing circuit for a telephone line includes a rectifier which is normally connected to the telephone line for rectifying the AC ringing and other signals. The rectified ringIng signals will not activate the ringing circuit of the telephone equipment, because a capacitor in the ringing circuit is charged and will not pass current therethrough in response to the DC signal. The selective ringing circuit includes a switch- selective signal-detecting arrangement by which a predetermined one of the ringing signals is detected and is used as an activation signal, while the other ringing signals are rejected. The activation signal activates an electrical connecting device which, when activated, electrically bypasses the rectifier and directly electrically connects the predetermined selected ringing signal to the telephone equipment. An automatic number identification circuit includes a transistor switch connects a predetermined ground resistance to the telephone line. A shunt resistance automatically shunts a tip or ring dropping resistor to compensate for the unbalanced resistive effects of a biasing circuit for the transistor switch. The rectifier supplies consistent polarity DC signals to the telephone equipment.
    • 16. 发明公开
    • Schaltungsanordnung für ein Gesellschaftsleitungssystem
    • Schaltungsanordnungfürein Gesellschaftsleitungssystem。
    • EP0248763A2
    • 1987-12-09
    • EP87730057.4
    • 1987-05-15
    • SIEMENS AKTIENGESELLSCHAFT
    • Schüler, Ulrich, Dipl.-Ing.
    • H04Q5/02
    • H04Q5/02
    • Die Erfindung betrifft eine Schaltungsanordnung für eine Fernmeldeanlage, insbesondere Betriebsfernsprechanlage für selbsttätigen Wählverkehr zwischen sämtlichen über Teilnehmer-Übertragungseinrichtungen an eine allen Teilnehmern gemeinsame Gesellschaftsleitung anschaltbaren Teilnehmerendgeräten.
      Jedem Teilnehmerendgerät (TEG, TEGn) ist jeweils eine Teil­nehmereinrichtung (TE, TEn) und eine die jeweilige Teilneh­mereinrichtung (TE, TEn) mit der Gesellschaftsleitung (GL) verbindende Leitungseinrichtung (LE, LEn) zugeordnet, die unter dem Steuereinfluß einer jeweils gemeinsamen Zentraleinheit (ZE) stehen.
      Eine derartige Schaltungsanordnung wird für Gesellschafts­leitungssysteme (Partylinesysteme) eingesetzt.
    • 本发明涉及一种用于电信系统的电路装置,特别是用于所有用户终端之间的用户拨号业务的业务电话系统,其可以经由用户传输设备连接到所有用户共同的一方。 每个用户终端(TEG,TEGn)在每种情况下都与用户设备(TE,TEn)和将相应用户设备(TE,TEn)连接到对方线路(GL)的电路设备(LE,LEn)相关联, 在每种情况下由普通中央处理器(ZE)控制。 这种电路布置用于派对线路系统。
    • 18. 发明公开
    • Selective ringing circuit for a telephone
    • 电路选择性呼叫电话机。
    • EP0210941A2
    • 1987-02-04
    • EP86630117.9
    • 1986-07-28
    • Del Monte, Philip JohnVanwey, Jackie Lee
    • Del Monte, Philip JohnVanwey, Jackie Lee
    • H04Q5/02
    • H04Q5/02
    • A selective ringing circuit for a telephone line includes a rectifier which is normally connected to the telephone line for rectifying the AC ringing and other signals. The rectified ringIng signals will not activate the ringing circuit of the telephone equipment, because a capacitor in the ringing circuit is charged and will not pass current therethrough in response to the DC signal. The selective ringing circuit includes a switch- selective signal-detecting arrangement by which a predetermined one of the ringing signals is detected and is used as an activation signal, while the other ringing signals are rejected. The activation signal activates an electrical connecting device which, when activated, electrically bypasses the rectifier and directly electrically connects the predetermined selected ringing signal to the telephone equipment. An automatic number identification circuit includes a transistor switch connects a predetermined ground resistance to the telephone line. A shunt resistance automatically shunts a tip or ring dropping resistor to compensate for the unbalanced resistive effects of a biasing circuit for the transistor switch. The rectifier supplies consistent polarity DC signals to the telephone equipment.
    • 20. 发明公开
    • Telephone line multiplication apparatus with improved ringing generator
    • Anordnung zur Mehrfach-Verwendung einer Fernsprechlinie mit Weckstromgenerator。
    • EP0251986A2
    • 1988-01-07
    • EP87630119.3
    • 1987-07-02
    • ECI TELECOM LTD.
    • Piasecki, JoshuaZohar, IsraelZalitzky, YeshayahuHaviv, Pinchas
    • H04Q5/02
    • H04Q5/02
    • A telephone line multiplication apparatus for connecting a plurality of telephone subscribers to a telephone exchange over a single two-wire telephone line which may carry voice and/or digital data information and control signal information such as off-hook/on-hook, dialing, ringing, metering and the like, wherein voice and/or digital data information is communicated with a first one of the plurality of telephone subscribers in digital form, and voice information is communicated with a second one of the plurality of telephone subscribers in analog form, characterized in that the control signal information relating to the operation of the second subscriber is communicated in digital form. The interface between the analog and digital communications channels is effected by a line interface providing impedance matching with the line impedance, wherein the analog channel is coupled by a connection with a portion of the two-wire telephone line impedance across a series capacitor which provides a preliminary stage of low-pass filtering. An improved ringing generator is also provided for powering the subscriber loads based on remote power feeding from the telephone exchange.
    • 一种用于通过单个双线电话线将多个电话用户连接到电话交换机的电话线路乘法装置,其可以携带语音和/或数字数据信息以及控制信号信息,例如摘机/挂机,拨号, 振铃,计量等,其中语音和/或数字数据信息以数字形式与多个电话用户中的第一个通信,并且语音信息以模拟形式与多个电话用户中的第二个通信, 其特征在于,以数字形式传送与第二用户的操作有关的控制信号信息。 模拟和数字通信通道之间的接口由提供与线路阻抗匹配的阻抗线的线路接口来实现,其中模拟通道通过与串联电容器的一部分双绞电话线阻抗的连接耦合,串联电容器提供 低通滤波的初步阶段。 还提供改进的振铃发生器,用于基于来自电话交换机的远程供电为用户负载供电。