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Coupling circuit for providing bilateral protection from hazardous voltages

阅读:360发布:2021-09-02

专利汇可以提供Coupling circuit for providing bilateral protection from hazardous voltages专利检索,专利查询,专利分析的服务。并且A protective coupling circuit inserted between a telephone line and station equipment provides bilateral hazardous voltage protection which is normally removed in response to ringing signals on the telephone line. The hazardous voltage protection is not removed however if station generated voltages exceeding a predetermined amplitude are present when the ringing signals are received and, if removed, is reinstated in response to continuous voltages exceeding a predetermined amplitude originating from the station equipment or the telephone line.,下面是Coupling circuit for providing bilateral protection from hazardous voltages专利的具体信息内容。

1. A circuit for providing a two-way signaling path between a telephone line and station equipment including means for limiting the amplitude of signals on the signaling path to provide hazardous voltage protection, and means responsive to ringing signals from the telephone line for disabling the limiting means, characterized in that the circuit further includes, means responsive to the presence of station generated signals exceeding a predetermined amplitude for preventing the disabling of the limiting means.
2. A circuit in accordance with claim 1 wherein the preventing means further includes means responsive to the occurrence of station generated signals exceeding the predetermined amplitude subsequent to the disabling of the limiting means for reenabling the limiting means.
3. A circuit in accordance with claim 1 wherein there is further included means operative subsequent to the disabling of the limiting means and responsive to the continuous presence of signals on the telephone line at least equal in amplitude to the amplitude of the ringing signals for reenabling the limiting means in a predetermined interval of time.
4. A circuit in accordance with claim 1 wherein there is further included means operative upon the application to the station equipment of a voltage signal greater in amplitude than the amplitude of the ringing signals and responsive to a predetermined amount of current drawn by the station equipment in response to the voltage signal applied thereto for reenabling the limiting means.
5. A circuit for normally inserting a voltage limiting device between a telephone line and a remote station to provide hazardous voltage protection including means for removing the voltage limiting device in response to ringing signals received from the telephone line, chAracterized in that the circuit further includes, means responsive to continuous signals on the telephone line at least equal in amplitude to the amplitude of the ringing signals and continuous for a predetermined interval of time for reinserting the voltage limiting device.
6. A circuit in accordance with claim 5 wherein there is further included means responsive to remote station generated signals exceeding a predetermined amplitude for preventing the removal of the voltage limiting device.
7. A circuit in accordance with claim 6 wherein there is further included means responsive to the occurrence of remote station generated signals exceeding the predetermined amplitude subsequent to the removal of the voltage limiting device for disabling the removing means.
8. A circuit for connecting station equipment to a telephone line including means for limiting the amplitude of signals applied to the station equipment and means responsive to ringing signals on the telephone line for removing the limiting means, characterized in that the circuit further includes, means responsive to the application of a voltage signal to the station equipment greater in amplitude than the amplitude of the ringing signals for detecting a predetermined amount of current drawn by the station equipment, and means responsive to the detecting means for reinstating the limiting means.
9. A circuit in accordance with claim 8 further including means responsive to continuous signals on the telephone line at least equal in amplitude to the amplitude of the ringing signals for enabling the reinstating means in a predetermined interval of time.
10. A circuit in accordance with claim 8 wherein there is further included means responsive to station generated signals exceeding a predetermined amplitude for preventing the removal of the limiting means.
11. A circuit for connecting a telephone line to a remote station including means responsive to the remote station going off-hook for signaling the occurrence of the off-hook condition via the telephone line to a telephone central office, characterized in that, the circuit further includes, means for detecting the absence of ringing signals on the telephone line, and means responsive to the detecting means for rendering the signaling means unresponsive to the remote station going off-hook.
12. A circuit in accordance with claim 11 wherein the detecting means includes means for charging a capacitor in response to the presence of ringing signals on the telephone line and means for discharging the capacitor in response to the absence of ringing signals on the telephone line, the rendering means being operative in response to the discharge of the capacitor to a predetermined level.
13. A method for protecting a telephone line from voltages generated by station equipment connected to the telephone line, comprising the steps of, normally inserting a voltage limiting device between the telephone line and the station equipment, removing the voltage limiting device in response to ringing signals on the telephone line, reinserting the voltage limiting device in response to station generated voltages exceeding a predetermined amplitude.
14. A method for protecting station equipment from voltages originating from a telephone line connected to the station equipment, comprising the steps of, normally inserting a voltage limiting device between the telephone line and the station equipment, removing the voltage limiting device in response to ringing signals on the telephone line, reinserting the voltage limiting device in response to the continuous presence of voltages on the telephone line exceeding a predetermined amplitude.
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