Long line adapter circuit usable with increased power supply
阅读：73发布：2023-11-22
专利汇可以提供Long line adapter circuit usable with increased power supply专利检索，专利查询，专利分析的服务。并且An improved long line adapter circuit designed to provide ringing supervision, pulse repetition and adequate transmission current for abnormally long subscriber loops and which may be used either at a central office or at a midplacement point to couple a subscriber facility to the central office, is disclosed. Included in the long line adapter circuit is a subscriber circuit and a central office circuit. A line coupling transformer is employed to provide audio coupling between the central office and subscriber circuits. A solid-state pulsing circuit is included in the subscriber circuit to respond to dialing at a subscriber subset and to a receiver thereof being placed in an off-hook condition. The adapter circuit is designed to be used with external power supplies providing either the standard 48 volts for normally distant subscriber loops or to provide a total of 96 volts for very long subscriber loops. A voltage converter or booster circuit and an off-hook sensing circuit may be included in the adapter circuit for the purpose of internally developing the additional + 48 volts for very long subscriber loops while employing the normal negative 48 volt external power supply.，下面是Long line adapter circuit usable with increased power supply专利的具体信息内容。
1. A long line adapter circuit for connecting a telephone central office to a subscriber subset to compensate for any extraordinary combined length of a subscriber loop and a central office loop, said subscriber subset being of the type having a receiver that is maintainable in an on-hook condition or an offhook condition, said subscriber loop being adapted to be opened and closed by operation of the subset, said telephone central office equipped to transmit ringing signals, said adapter circuit comprising: a central office loop circuit adapted to be connected to a telephone central office by a central office loop and including switching means for being connected to said central office loop to effectively open and close said central office loop; a subscriber loop circuit adapted to be connected to a telephone subscriber subset by a subscriber loop and to a source of direct current power, said subscriber loop circuit including: pulsing means, connected in said subscriber loop, for providing a control signal when the subscriber loop is closed by operation of said subset, said control signal effecting operation of said switching means to close said central office loop; voltage increasing means, adapted to be operatively connected to any direct current power supply that is coupled to said subscriber loop circuit, for increasing by a predetermined amount the voltage applied to said subscriber loop circuit and said subscriber loop; sensing means for providing an off-hook signal in response to said receiver being in an off-hook condition, said off-hook signal being applied to said voltage increasing means to enable the operation thereof for the duration of any off-hook signal; safety means, connected to said pulsing means and said sensing means, for simultaneously preventing false operation of said pulsing means and said sensing means by the transmission of said ringing signals by shunting said pulsing means and said sensing means which are connected in series; and means for inductively coupling said central office loop circuit and said subscriber loop circuit.
2. The apparatus defined by claim 1 wherein said central office loop circuit includes ringing detector means for detecting ringing signals transmitted from said telephone central office and for enabling said ringing signals to be applied to said subscriber subset, said safety means being operatively controlled by said ringing detector means to operate in response to the detection of ringing signals by said ringing detecTor means.
3. The apparatus defined by claim 1 wherein said subscriber loop circuit includes a tip lead and a ring lead which are each adapted to be effectively connected to said subscriber subset by said subscriber loop and to a direct current power supply, said pulsing means including a first transistor coupled in said tip lead to be rendered conductive in response to said subscriber loop being closed by operation of said subset.
4. The apparatus defined by claim 3 wherein said safety means comprises a second transistor connected to shunt said first transistor, said first transistor being short circuited in response to said second transistor being rendered conductive.
5. The apparatus defined by claim 2 wherein said subscriber loop circuit includes a tip lead and a ring lead which are each adapted to be effectively connected to said subscriber subset by said subscriber loop and to a direct current power supply, said pulsing means including a first transistor coupled in said tip lead to be rendered conductive in response to said subscriber loop being closed by operation of said subset.
6. The apparatus defined by claim 5 wherein said safety means comprises a second transistor connected to shunt said first transistor, said first transistor being short circuited in response to said second transistor being rendered conductive.
7. The apparatus defined by claim 6, said sensing means comprising a third transistor serially connected with said first transistor such that said first and third transistors are both responsive to said subscriber loop being closed, said first and third transistors both being short circuited by said second transistor being rendered conductive.
8. A long line adapter circuit for being connected between a telephone central office and a telephone to compensate for undesired attenuation of signals by the extraordinary length of the telephone loop formed by the tip and ring telephone lines connecting the telephone to the central office, said telephone having a receiver adapted for an on-hook condition or an off-hook condition, said central office being adapted for sending ringing signals, said long line adapter circuit including: a pair of transformers interposed between said central office and said telephone by being connected in said tip and ring telephone lines, said transformers each having primary and secondary coils, the primary coils of said transformers connected in series between the tip and ring telephone lines connected to the central office to form a central office loop, the secondary coils connected in series between the tip and ring telephone lines connected to the telephone to form a subscriber loop, said central office loop being inductively coupled to said subscriber loop by said transformers; a central office loop circuit connected between said primary coils, said central office loop circuit including switching means for selectively opening or closing a resistive path between said primary coils; and a subscriber loop circuit connected to said secondary coils, said subscriber loop circuit including: pulsing means for providing a control signal when said receiver is in an off-hook condition, said control signal effecting operation of said switching means to close said resistive path between said primary coils; a pair of terminals for being connected to a source of direct current power; voltage booster means for increasing by a predetermined amount the voltage applied to said subscriber loop circuit by any source of direct control power connected to said pair of terminals; sensing means for providing an off-hook signal when said receiver is in an off-hook condition, said off-hook signal being applied to said voltage booster means to enable operation thereof for the duration of said off-hook signal, wherein said pulsing means, said sensing means, said pair of terminals and said inverter means are effectively connected in series between said secondary coils.
9. The long line adapter circuit defined by claim 8 further including: contact means for selectively completing direct electrical connections of the tip and ring telephone lines between said central office and said telephone, said direct electrical connections effectively by-passing said transformers; and ringing detector means for detecting ringing signals transmitted from said central office to signal said telephone, said ringing detector means connected in parallel to said switching means, said ringing detector means being shunted when said switching means is operated to close said resistive path between said primary coils.
10. The long line adapter circuit defined by claim 9 further including: safety means, responsive to operation of said ringing detector means by the reception of ringing signals, for preventing false operation of said pulsing means and said sensing means.
| 标题 | 发布/更新时间 | 阅读量 |
|---|---|---|
| 燃料电池系统和燃料电池系统的控制方法 | 2020-05-26 | 2 |
| 用于操作电子灯布置的系统 | 2020-05-08 | 3 |
| GTNET接口卡和源网联合实时仿真系统 | 2020-07-15 | 1 |
| Control device of electric vehicle | 2022-04-07 | 2 |
| Power supply system, vehicle with the same, and its control method | 2022-02-26 | 1 |
| ENERGY MANAGEMENT SYSTEM TO IMPROVE EFFICIENCY OF ELECTRIC AND HYBRID DRIVE TRAINS | 2021-10-31 | 1 |
| 모터 드라이버 및 그 작동방법 | 2020-07-22 | 1 |
| 부스트 컨버터 | 2021-01-20 | 1 |
| 레이저와 초음파를 이용한 전자 거리 측정장치 | 2022-04-30 | 1 |
| 배터리 셀 전압 균등 제어장치 및 제어방법 | 2020-12-04 | 0 |
高效检索全球专利专利汇是专利免费检索,专利查询,专利分析-国家发明专利查询检索分析平台，是提供专利分析，专利查询，专利检索等数据服务功能的知识产权数据服务商。
我们的产品包含105个国家的1.26亿组数据，免费查、免费专利分析。
分析报告
专利汇分析报告产品可以对行业情报数据进行梳理分析，涉及维度包括行业专利基本状况分析、地域分析、技术分析、发明人分析、申请人分析、专利权人分析、失效分析、核心专利分析、法律分析、研发重点分析、企业专利处境分析、技术处境分析、专利寿命分析、企业定位分析、引证分析等超过60个分析角度，系统通过AI智能系统对图表进行解读，只需1分钟，一键生成行业专利分析报告。
QQ群二维码
意见反馈
意见反馈