US3920899A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for the testing of single current-double current converter circuits and associated trunk lines in centrally controlled data switching installations
Assignee: Siemens AG
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Filing: 1974-02-27
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Granted: 1975-11-18
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Expires: 1994-02-27
Abstract
Abstract A method and circuit arrangement are described by means of which a testing exchange station can determine whether a predetermined converter circuit and out-going trunk line are in an operative condition or a busy signal will be received therefrom. The method contemplates transmitting a test signal from a testing exchange station to the converter circuit in question and determining the conditions of the tested converter circuit by determining the condition of a reflected signal from said tested converter circuit to said testing exchange station. An apparatus is described whereby this reflecting procedure is facilitated by replacing the reflection-preventing contacts in the holding circuit for a transmission relay in the converter circuit with a continuous connection. Further, in those converter circuits which are permanently connected to a subscriber line contacts are added to the holding circuits for a transmission relay, and these contacts will connect a resistor in the holding circuit to a stop polarity. The aforementioned contacts are open when the converter circuit is in a dial condition.
Inventors
- 👤 Ekkehard Riedel
- 👤 Lothar Schmid
- 👤 Fritz Giebler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 23:21
CPC Classifications
H; H04; H04L; H04L43/00; H04L43/50
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
87 words
A method for producing reflected test signals for testing converter circuits and associated trunk lines in data switching exchanges where the converter circuits are assigned to the subscriber lines over a through-connection network, said testing being carried out by analyzing signal waveforms reflected from the tested circuits, comprising: transmitting a test signal formed by a pulse to the converter circuit to be tested prior to the completion of the connection in said through-connection network and causing said test signal to be reflected by said tested converter circuit.
Claim 2
Independent Claim
87 words
A method for producing reflected test signals for testing converter circuits and associated trunk lines in data switching exchanges where the converter circuits are assigned to the subscriber lines over a through-connection network, said testing being carried out by analyzing signal waveforms reflected from the tested circuits, comprising: transmitting a test signal formed by a pulse to the converter circuit to be tested prior to the completion of the connection in said through-connection network and causing said test signal to be reflected by said tested converter circuit.
Claim 3
Dependent Claim
15 words
The method defined in claim 1 wherein said transmitted signal is an impulse wave form.
Claim 4
Dependent Claim
26 words
The method defined in claim 1 wherein all of the contacts in said converter circuits are in a rest condition when said test signal is transmitted.
Claim 5
Dependent Claim
23 words
The method defined in claim 1 wherein said converter circuit is in a prepared for writing condition when said test signal is transmitted.
Claim 6
Dependent Claim
73 words
In a conventional single current-double current converter circuit of the type which would have reflection-preventing contacts in a holding circuit for a transmission relay said reflection-preventing contacts being adapted to be opened when said converter circuit is in a rest condition, means for causing the reflection of a test signal transmitted to said converter circuit comprising: continuous electrical connection means connected across said contacts as to remove said contacts from said holding circuit.
Claim 7
Dependent Claim
73 words
In a conventional single current-double current converter circuit of the type which would have reflection-preventing contacts in a holding circuit for a transmission relay said reflection-preventing contacts being adapted to be opened when said converter circuit is in a rest condition, means for causing the reflection of a test signal transmitted to said converter circuit comprising: continuous electrical connection means connected across said contacts as to remove said contacts from said holding circuit.
Claim 8
Dependent Claim
98 words
In a conventional single current-double current converter having a holding circuit for a transmission relay and adapted to be used in an exchange wherein one of said converter circuits is permanently connected to each subscriber line, means for causing the reflection of a test signal traNsmitted to said converter circuit comprising: a relay for changing the polarity of a subscriber loop connected to said converter circuit, a resistor in said holding circuit, contact means operated by said relay connecting said resistor to a stop polarity, said contact means being opened when converter circuit is in a dial condition.
Claim 9
Dependent Claim
98 words
In a conventional single current-double current converter having a holding circuit for a transmission relay and adapted to be used in an exchange wherein one of said converter circuits is permanently connected to each subscriber line, means for causing the reflection of a test signal traNsmitted to said converter circuit comprising: a relay for changing the polarity of a subscriber loop connected to said converter circuit, a resistor in said holding circuit, contact means operated by said relay connecting said resistor to a stop polarity, said contact means being opened when converter circuit is in a dial condition.
Claim 10
Independent Claim
90 words
A method for producing reflected test signals for the testing of converter circuits and associated trunk lines in centrally controlled data exchange installations to determine the condition thereof by analyzing a test signal reflected from the tested circuits, comprising: transmitting a test signal formed by a pulse from a testing exchange station to a preselected converter circuit and causing said test signal to be reflected by said preselected converter circuit to a testing exchange station for analysis therein, said converter circuit being conditioned so as to be ready to operate.
Claim 11
Independent Claim
90 words
A method for producing reflected test signals for the testing of converter circuits and associated trunk lines in centrally controlled data exchange installations to determine the condition thereof by analyzing a test signal reflected from the tested circuits, comprising: transmitting a test signal formed by a pulse from a testing exchange station to a preselected converter circuit and causing said test signal to be reflected by said preselected converter circuit to a testing exchange station for analysis therein, said converter circuit being conditioned so as to be ready to operate.
Claim 12
Independent Claim
93 words
A method for producing reflected test signals for the testing of converter circuits and associated trunk lines in exchanges wherein a converter circuit is permanently assigned to each subscriber line, said testing being carried out by analyzing a signal waveform reflected from the tested circuits, comprising the steps of: transmitting a dial request signal by a controlling exchange station to the converter circuit to be tested, when said converter circuit is in a dial condition and causing said request signal to be reflected by said testing converter circuit when in a dial condition.
Claim 13
Independent Claim
93 words
A method for producing reflected test signals for the testing of converter circuits and associated trunk lines in exchanges wherein a converter circuit is permanently assigned to each subscriber line, said testing being carried out by analyzing a signal waveform reflected from the tested circuits, comprising the steps of: transmitting a dial request signal by a controlling exchange station to the converter circuit to be tested, when said converter circuit is in a dial condition and causing said request signal to be reflected by said testing converter circuit when in a dial condition.
References Cited (Backward Citations)
US2709784A
Cited
US3526729A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-11-17 | 1979-05-19 | 1979-11-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-11-17 | 1983-05-19 | 1983-11-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-11-17 | 1987-05-19 | 1987-11-18 | $7700.00 | Window Closed / Lapsed |