US3894192A
Expired / Lapsed
US
⏱️ 0.0 years remaining
DX signaling circuit
Assignee: GTE Automatic Electric Laboratories Inc
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Filing: 1974-07-29
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Granted: 1975-07-08
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Expires: 1994-07-29
Abstract
Abstract An electronic DX signaling circuit for detection of DC signals on a two-way telephone trunk circuit. A bridge network connects to a cable pair, and a voltage detection circuit connects to four junctions within the bridge circuit. The bridge receives the DC signaling from the cable, and the voltage detection circuit adds and subtracts four voltages within the bridge in such a way so as to recover the desired signaling information from the unwanted received signals.
Inventors
- 👤 Otto G Wisotzky
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 19:48
CPC Classifications
H; H04; H04M; H04M7/00; H04M7/0096; H04Q; H04Q1/00; H04Q1/18; H04Q1/30; H04Q1/38
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
242 words
In a telephone signaling system, appartus for detecting the polarity of signaling voltages applied over a cable pair, and said apparatus comprising: an input port having terminals (A and B) for connection to a cable pair; a first resistor and a capacitor connected in parallel having a terminal (10) at one end, and terminal (M) at the other end, and the parallel combination having an impedance (ZRC); a second resistor of resistance (R1), having one end connected to said terminal (A), and the other end connected to said terminal (M); first means providing first and second voltage generators, said first voltage generator having a source impedance (R10) and having an output terminal connected to said terminal (10), and said second voltage generator having a source impedance (R11) and having an output terminal connected to said terminal (B); second means having only two inputs and one output, providing a voltage summation of the voltages appearing on the inputs, one input connected to said terminal (A), and the second input connected to said terminal (10); third means having only two inputs and one output, providing a voltage summation of the voltages appearing on said inputs, one input connected to said terminal (M), and the second input connected to said terminal (B); and fourth means determining the voltage difference between onLy two inputs, one input connected to the output of said second means and the other input connected to the outut of said third means.
Claim 2
Dependent Claim
242 words
In a telephone signaling system, appartus for detecting the polarity of signaling voltages applied over a cable pair, and said apparatus comprising: an input port having terminals (A and B) for connection to a cable pair; a first resistor and a capacitor connected in parallel having a terminal (10) at one end, and terminal (M) at the other end, and the parallel combination having an impedance (ZRC); a second resistor of resistance (R1), having one end connected to said terminal (A), and the other end connected to said terminal (M); first means providing first and second voltage generators, said first voltage generator having a source impedance (R10) and having an output terminal connected to said terminal (10), and said second voltage generator having a source impedance (R11) and having an output terminal connected to said terminal (B); second means having only two inputs and one output, providing a voltage summation of the voltages appearing on the inputs, one input connected to said terminal (A), and the second input connected to said terminal (10); third means having only two inputs and one output, providing a voltage summation of the voltages appearing on said inputs, one input connected to said terminal (M), and the second input connected to said terminal (B); and fourth means determining the voltage difference between onLy two inputs, one input connected to the output of said second means and the other input connected to the outut of said third means.
Claim 3
Dependent Claim
18 words
Apparatus as defined in claim 1 and further comprising a near-end signaling voltage generator connected to terminal (M).
Claim 4
Dependent Claim
34 words
Apparatus as defined in claim 2 wherein said terminal (A) is connected to the tip lead of said cable pair and said terminal (B) is connected to the ring lead of said cable pair.
Claim 5
Dependent Claim
14 words
Apparatus as defined in claim 1 wherein said impedances are related by the expression:
Claim 6
Dependent Claim
16 words
Apparatus as defined in claim 3 wherein the impedance (ZRC) is equal to the impedance (ZL).
Claim 7
Dependent Claim
84 words
Apparatus as defined in claim 1 wherein said first means further comprises: terminal (Vo) connected to a source of office battery voltage; terminal (G) connected to a source of office ground voltage; third and fourth resistors connected in series between terminals (Vo) and (G), and with the junction of said third and fourth resistors connected to terminal (10); fifth and sixth resistors connectd in series between terminals (Vo) and (G), and with the junction of said fifth and sixth resistors connected to terminal (B).
Claim 8
Dependent Claim
143 words
Apparatus as defined in claim 1 wherein said first means further comprises: terminal (Vo) connected to a source of office battery voltage; terminal (G) connected to a source of office ground voltage; a first Zener diode operatively connected with its cathode to terminal (Vo); a second Zener diode operatively connected with its anode to terminal (G); seventh and eighth resistors connected in series, one end connected to the anode of said first Zener diode, the other end connected to the cathode of said second Zener diode, and the junction of said seventh and eighth resistors connected to terminal (C); and ninth and 10th resistors connected in series, one end connected to the anode of said first Zener diode, the other end connected to the cathode of said second Zener diode, and the junction of said ninth and 10th resistors connected to terminal (B).
Claim 9
Dependent Claim
51 words
Apparatus as defined in claim 7 wherein said second means further comprises: 11th and 12th resistors connected in series, one end connected to said terminal (A), the other end connected to said terminal (10), and the junction of said 11th and 12th resistors connected to one input to said fourth means.
Claim 10
Dependent Claim
52 words
Apparatus as defined in claim 8 wherein said third means further comprises: 13th and 14th resistors connected in series, one end connected to said terminal (M), the other end connected to said terminal (10), and the junction of said 13th and 14th resistors connected to the other input to said fourth means.
Claim 11
Dependent Claim
21 words
Apparatus as defined in claim 8 wherein said fourth means further comprises: a differential amplifier having two inputs and one output.
References Cited (Backward Citations)
US3763321A
Cited
US3849607A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-07-07 | 1979-01-06 | 1979-07-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-07-07 | 1983-01-06 | 1983-07-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-07-07 | 1987-01-06 | 1987-07-08 | $7700.00 | Window Closed / Lapsed |