US3668314A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Supervisory circuit for electronically monitoring a telegraphy line
Assignee: Nokia Inc
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Filing: 1969-12-31
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Granted: 1972-06-06
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Expires: 1989-12-31
Abstract
Abstract An electronic supervisory circuit indicates the condition of a telegraphy line being supervised without interfering with the transmission of the telegraphy signals. The supervisory circuit employs a holding circuit responsive to the detection of modulated line signals which maintains the output of the supervisory circuit during the periods when the modulated signals are transmitted over the telegraphy line. An auxiliary output is also employed to indicate the instantaneous condition of the line.
Inventors
- 👤 Claude Rousseau
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 14:22
CPC Classifications
H; H04; H04L; H04L43/00
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
342 words
A supervisory electronic control apparatus for monitoring telegraphy line signals and adapted to be inserted at any point in a telegraphy channel, comprising: first means responsive to the condition of the telegraphy line for generating a supervisory output signal upon the receipt of a calling signal potential on said telegraphy line, including a first transistor circuit connected in the line for detecting the polarity of the line potential and for generating a signal representative of said polarity, and a first voltage polarity sensitive circuit responsive to the signal generated by said first transistor circuit for delivering a supervisory output signal at the output of said first means when said transistor circuit detects the polarity of the line potential to be that of a calling signal; and second means responsive to said first means for maintaining the generation of said supervisory output signal during the transmission of modulated telegraphy signals, which follow said calling signal over said telegraphy channel, and for terminating the generation of said supervisory output signal a predetermined time after the receipt of a released signal potential on said telegraphy line, including a delay circuit responsive to the signal generated by said first transistor circuit for maintaining the delivery of said supervisory output signals by said first voltage polarity sensitive circuit during the portions of transmission of modulated telegraphy signals when the polarity of the line potential is opposite to the polarity of the line potential during the transmission of a calling signal, wherein said delay circuit includes a holding circuit for storing a reference potential, a pair of control transistors connected to opposite sides of said holding circuit, one of said control transistors being connected also to said first transistor circuit for controlling the storing of said reference potential in said holding circuit, in response to the signal generated by said first transistor circuit, the other of said control transistors being responsive to the discharging of the reference potential from said holding circuit, for controlling the length of time that the delivery of said supervisory output signal is maintained.
Claim 2
Dependent Claim
342 words
A supervisory electronic control apparatus for monitoring telegraphy line signals and adapted to be inserted at any point in a telegraphy channel, comprising: first means responsive to the condition of the telegraphy line for generating a supervisory output signal upon the receipt of a calling signal potential on said telegraphy line, including a first transistor circuit connected in the line for detecting the polarity of the line potential and for generating a signal representative of said polarity, and a first voltage polarity sensitive circuit responsive to the signal generated by said first transistor circuit for delivering a supervisory output signal at the output of said first means when said transistor circuit detects the polarity of the line potential to be that of a calling signal; and second means responsive to said first means for maintaining the generation of said supervisory output signal during the transmission of modulated telegraphy signals, which follow said calling signal over said telegraphy channel, and for terminating the generation of said supervisory output signal a predetermined time after the receipt of a released signal potential on said telegraphy line, including a delay circuit responsive to the signal generated by said first transistor circuit for maintaining the delivery of said supervisory output signals by said first voltage polarity sensitive circuit during the portions of transmission of modulated telegraphy signals when the polarity of the line potential is opposite to the polarity of the line potential during the transmission of a calling signal, wherein said delay circuit includes a holding circuit for storing a reference potential, a pair of control transistors connected to opposite sides of said holding circuit, one of said control transistors being connected also to said first transistor circuit for controlling the storing of said reference potential in said holding circuit, in response to the signal generated by said first transistor circuit, the other of said control transistors being responsive to the discharging of the reference potential from said holding circuit, for controlling the length of time that the delivery of said supervisory output signal is maintained.
Claim 3
Dependent Claim
33 words
A supervisory electronic control apparatus according to claim 1, further including third means responsive to said first means for generating an auxiliary output signal representative of the instantaneous condition of the telegraphy line.
Claim 4
Dependent Claim
75 words
A supervisory electronic control apparatus according to claim 1, wherein said delay circuit further includes a supervisory output control transistor connected to said voltage polarity sensitive circuit and said other control transistor for controlling the maintaining of the supervisory output signal during the portion of the transmission of the modulated telegraphy signals when the polarity of the line potential is opposite to the polarity of the line potential during the transmission of a calling signal.
Claim 5
Dependent Claim
51 words
A supervisory electronic control apparatus according to claim 1, wherein said holding circuit includes a capacitor connected between said pair of control transistors and a discharging resistor connected between the side of said capacitor, which is connected to said other control transistor, and a fixed reference potential for discharging said capacitor.
Claim 6
Dependent Claim
95 words
A supervisory electronic control apparatus according to claim 3, wherein said holding circuit includes a capacitor connected between said pair of control transistors and a discharging resistor connected between the side of said capacitor, which is connected to said other control transistor, and a fixed reference potential for discharging said capacitor, and for rendering said other control transistor conductive a predetermined time after the termination of said signal generated by said first transistor cIrcuit representative of said polarity, thereby cutting off said supervisory output control transistor and terminating the generation of said supervisory output signal.
Claim 7
Dependent Claim
63 words
A supervisory electronic control apparatus according to claim 5, wherein said first transistor circuit includes a first detection transistor connected across a diode inserted in the telegraphy line, a field effect transistor coupled to said first detection transistor and a second detection transistor coupled to said field effect transistor, the output signal delivered by said second detection transistor being said polarity representative signal.
Claim 8
Dependent Claim
39 words
A supervisory electronic control apparatus according to claim 6, further including third means responsive to said first means for generating an auxiliary output signal representative of the instantaneous condition of the telegraphy line, said third means comprising a diode.
Claim 9
Dependent Claim
35 words
An apparatus according to claim 6, wherein said one control transistor and said supervisory output control transistor each have an electrode thereof connected through a respective Zener diode to an additional source of reference potential.
Claim 10
Dependent Claim
16 words
An apparatus according to claim 6, wherein said capacitor is connected directly between said control transistors.
Claim 11
Dependent Claim
56 words
An apparatus according to claim 8, wherein said first detector transistor has its base and emitter electrodes connected across a parallel resistor-diode combination inserted in said telegraphy line and has its collector electrode resistively coupled to the gate electrode of said field effect transistor, the source of which is connected to a further source of potential.
Claim 12
Dependent Claim
53 words
An apparatus according to claim 9, wherein said second detector transistor is resistively connected to the drain electrode of said field effect transistor and the source of bias voltage therefor and has its collector electrode diode coupled to the base of said first control transistor and to said first voltage polarity sensitive circuit.
Claim 13
Dependent Claim
60 words
An apparatus according to claim 11, further including a second voltage polarity sensitive circuit connected to said first voltage polarity sensitive circuit and wherein the collector electrode of said supervisory output control transistor is directly connected to said second voltage polarity sensitive circuit, while the base electrode thereof is directly connected to the collector electrode of said other control transistor.
Claim 14
Dependent Claim
24 words
An apparatus according to claim 12, wherein the emitter electrodes of said control transistors are diode coupled to said additional source of reference potential.
Claim 15
Dependent Claim
237 words
A supervisory electronic control apparatus for monitoring telegraphy line signals and adapted to be inserted at any point in a telegraphy channel, comprising: first means responsive to the condition of the telegraphy line for generating a supervisory output signal upon the receipt of a calling signal potential on said telegraphy line, including a first transistor circuit connected in the line for detecting the polarity of the line potential and for generating a signal representative of said polarity and a first voltage polarity sensitive circuit responsive to the signal generated by said first transistor circuit for delivering a supervisory output signal at the output of said first means when said transistor circuit detects the polarity of the line potential to be that of a calling signal; and second means responsive to said first means for maintaining the generation of said supervisory output signal during the transmission of modulated telegraphy signals, which follow said calling signal over said telegraphy channel, and for terminating the generation of said supervisory output signal a predetermined time after the receipt of a release signal potential on said telegraphy line, wherein said first transistor circuit includes a first detection transistor connected across a diode inserted in the telegraphy line, a field effect transistor coupled to said first detection transistor and a seCond detection transistor coupled to said field effect transistor, the output signal delivered by said second detection transistor being said polarity representative signal.
Claim 16
Dependent Claim
237 words
A supervisory electronic control apparatus for monitoring telegraphy line signals and adapted to be inserted at any point in a telegraphy channel, comprising: first means responsive to the condition of the telegraphy line for generating a supervisory output signal upon the receipt of a calling signal potential on said telegraphy line, including a first transistor circuit connected in the line for detecting the polarity of the line potential and for generating a signal representative of said polarity and a first voltage polarity sensitive circuit responsive to the signal generated by said first transistor circuit for delivering a supervisory output signal at the output of said first means when said transistor circuit detects the polarity of the line potential to be that of a calling signal; and second means responsive to said first means for maintaining the generation of said supervisory output signal during the transmission of modulated telegraphy signals, which follow said calling signal over said telegraphy channel, and for terminating the generation of said supervisory output signal a predetermined time after the receipt of a release signal potential on said telegraphy line, wherein said first transistor circuit includes a first detection transistor connected across a diode inserted in the telegraphy line, a field effect transistor coupled to said first detection transistor and a seCond detection transistor coupled to said field effect transistor, the output signal delivered by said second detection transistor being said polarity representative signal.
Claim 17
Dependent Claim
308 words
A supervisory electronic control apparatus for monitoring telegraphy line signals and adapted to be inserted at any point in a telegraphy channel comprising: first means, responsive to the condition of the telegraphy line for generating a supervisory output signal upon the receipt of a calling signal potential on said telegraphy line; and second means responsive to said first means for maintaining the generation of said supervisory output signal during the transmission of modulated telegraphy signals which follow said calling signal over said telegraphy channel and for terminating the generation of said supervisory output signal a predetermined time after the receipt of a release signal potential on said telegraphy line, wherein said first means includes a first transistor circuit connected in the line for detecting the polarity of the line potential and for generating a signal representative of said polarity, and a first voltage polarity sensitive circuit responsive to the signal generated by said first transistor circuit for delivering a supervisory output signal at the output of said first means when said transistor circuit detects the polarity of the line potential to be that of a calling signal, and wherein said second means includes a delay circuit responsive to the output of said first transistor circuit and a second voltage polarity sensitive circuit connected to said delay circuit and connected to said first voltage polarity sensitive circuit for maintaining the delivery of said supervisory output signal by said second voltage polarity sensitive circuit during the portions of the transmission of modulated telegraphy signals when the polarity of the line potential is opposite to the polarity of the line potential during the transmission of a calling signal, and wherein said voltage polarity sensitive circuit comprises a first diode and said second voltage polarity sensitive circuit comprises a second diode each of which is connected together to provide said supervisory signal.
Claim 18
Dependent Claim
308 words
A supervisory electronic control apparatus for monitoring telegraphy line signals and adapted to be inserted at any point in a telegraphy channel comprising: first means, responsive to the condition of the telegraphy line for generating a supervisory output signal upon the receipt of a calling signal potential on said telegraphy line; and second means responsive to said first means for maintaining the generation of said supervisory output signal during the transmission of modulated telegraphy signals which follow said calling signal over said telegraphy channel and for terminating the generation of said supervisory output signal a predetermined time after the receipt of a release signal potential on said telegraphy line, wherein said first means includes a first transistor circuit connected in the line for detecting the polarity of the line potential and for generating a signal representative of said polarity, and a first voltage polarity sensitive circuit responsive to the signal generated by said first transistor circuit for delivering a supervisory output signal at the output of said first means when said transistor circuit detects the polarity of the line potential to be that of a calling signal, and wherein said second means includes a delay circuit responsive to the output of said first transistor circuit and a second voltage polarity sensitive circuit connected to said delay circuit and connected to said first voltage polarity sensitive circuit for maintaining the delivery of said supervisory output signal by said second voltage polarity sensitive circuit during the portions of the transmission of modulated telegraphy signals when the polarity of the line potential is opposite to the polarity of the line potential during the transmission of a calling signal, and wherein said voltage polarity sensitive circuit comprises a first diode and said second voltage polarity sensitive circuit comprises a second diode each of which is connected together to provide said supervisory signal.
Claim 19
Dependent Claim
146 words
An apparatus according to claim 15, wherein said delay circuit includes a holding circuit for storing a reference, potential, a pair of control transistors connected to opposite sides of said holding circuit, one of said control transistors being connected also to said first transistor circuit for controlling the storing of said reference potential in said holding circuit, in response to the signal generated by said first transistor circuit, the other of said control transistors being connected to the discharging of the reference potential from said holding circuit, for controlling the length of time that the delivery of said supervisory output signal is maintained and wherein said holding circuit includes a capacitor connected between said pair of control transistors and a discharging resistor connected between the side of said capacitor, which is connected to said other control transistor, and a fixed reference potential for discharging said capacitor.
Claim 20
Dependent Claim
159 words
An apparatus according to claim 16, wherein said delay circuit further includes a supervisory output control transistor connected to said voltage polarity sensitive circuit and said other control transistor for controlling the maintaining of the supervisory output signal during the portion of the transmission of the modulated telegraphy signals when the polarity of the line potential is opposite to the polarity of the line potential during the transmission of a calling signal and wherein said holding circuit includes a capacitor connected between said pair of control transistors and a discharging resistor connected between the side of said capacitor, which is connected to said other control transistor, and a fixed reference potential for discharging said capacitor, and for rendering said other control transistor conductivE a predetermined time after the termination of said signal generated by said first transistor circuit representative of said polarity, thereby cutting off said supervisory output control transistor and terminating the generation of said supervisory output signal.
Claim 21
Dependent Claim
60 words
An apparatus according to claim 17, wherein said first transistor circuit includes a first detection transistor connected across a diode inserted in the telegraphy line, a field effect transistor coupled to said first detection transistor and a second detection transistor coupled to said field effect transistor, the output signal delivered by said second detection transistor being said polarity representative signal.
References Cited (Backward Citations)
US3317668A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-06-06 | 1975-12-06 | 1976-06-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-06 | 1979-12-06 | 1980-06-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-06 | 1983-12-06 | 1984-06-06 | $7700.00 | Window Closed / Lapsed |