US3558828A
Expired / Lapsed
US
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Electronic scanners
Assignee: International Standard Electric Corp
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Filing: 1968-07-22
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Granted: 1971-01-26
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Expires: 1988-07-22
Abstract
Abstract In a large capacity common-controlled telephone network utilizing crosspoint matrix switching, a scanning and testing system is provided. The present scanner reads the condition of subscriber line conditions and most importantly detects changes in condition by means of a display contact and a transformer associated with each crosspoint.
Inventors
- 👤 Pierre R L Marty
- 👤 Roger L Dousset
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 08:00
CPC Classifications
H; H04; H04Q; H04Q3/00; H04Q3/42; H04Q3/54; H04Q3/545; H04Q3/54575; H04Q3/54591
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
255 words
An electronic scanner for determining the condition of a unit connectable to a switching network comprising a matrix made up of columns and rows defining crosspoints and comprising one conductor per column; means for selectively connecting a column conductor to a column current generator; a principal conductor and an auxiliary conductor per row; means for selectively connecting the conductors of one row to a row current generator; a detection transformer per row, having its primary winding connected between the row current generator and the row auxiliary conductor; means for testing the condition of an individual unit assigned to a crosspoint of the matrix; the primary winding of a saturable transformer of an individual unIt connected, at each crosspoint, between the column conductor and the corresponding row principal conductor; a first reading-circuit common to a row and to which are connected the secondary windings of the saturable transformers assigned to the row for detecting voltage induced in the secondary of said transformer responsive to a current flowing through a column conductor and the primary winding of the transformer connected thereto; and a second reading circuit common to a row and to which is connected the secondary winding of the detection transformer of this row, said second reading circuit responsive to voltage in the secondary of the detection transformer of a row indicative of current flow from the row auxiliary conductor to the detection transformer primary and coincidence means responsive to voltage sensed by both said reading circuits to signal a change in condition at a crosspoint.
Claim 2
Dependent Claim
255 words
An electronic scanner for determining the condition of a unit connectable to a switching network comprising a matrix made up of columns and rows defining crosspoints and comprising one conductor per column; means for selectively connecting a column conductor to a column current generator; a principal conductor and an auxiliary conductor per row; means for selectively connecting the conductors of one row to a row current generator; a detection transformer per row, having its primary winding connected between the row current generator and the row auxiliary conductor; means for testing the condition of an individual unit assigned to a crosspoint of the matrix; the primary winding of a saturable transformer of an individual unIt connected, at each crosspoint, between the column conductor and the corresponding row principal conductor; a first reading-circuit common to a row and to which are connected the secondary windings of the saturable transformers assigned to the row for detecting voltage induced in the secondary of said transformer responsive to a current flowing through a column conductor and the primary winding of the transformer connected thereto; and a second reading circuit common to a row and to which is connected the secondary winding of the detection transformer of this row, said second reading circuit responsive to voltage in the secondary of the detection transformer of a row indicative of current flow from the row auxiliary conductor to the detection transformer primary and coincidence means responsive to voltage sensed by both said reading circuits to signal a change in condition at a crosspoint.
Claim 3
Dependent Claim
185 words
An electronic scanner as defined in claim 1 in which to each crosspoint of the matrix are assigned m individual units, and wherein there is provided: one principal conductor and m auxiliary conductors per row; m detection transformers per row; m primary windings of m saturable transformers connected, at each crosspoint, between the column conductor and the row principal conductor; m reading circuits common to a row and to which are connected, respectively, the m secondary windings of the m saturable transformers assigned to each crosspoint of the row; m display contacts connected, at each crosspoint, between the column conductor and the m row auxiliary conductors; m other reading circuits, common to a row and to which are connected, respectively, the secondary windings of the m row detection transformers; the 2 X m reading circuits responsive to selection of one column and one row for providing signals indicating the condition of m individual units at the same time, whereby the scanning speed of the scanner is multiplied by a factor of m without however necessitating a corresponding increase of the complexity of the scanner''s circuits.
Claim 4
Dependent Claim
74 words
An electronic scanner as defined in claim 2, wherein the rows are distributed into p groups of n rows, and in which there is provided p row units comprising each a row current source and means for selectively connecting this source to one of the n rows of the group, making up p submatrices each having its own row circuits and the same column circuits, permitting p reading operations simultaneously, one in each submatrix.
Claim 5
Dependent Claim
39 words
An electronic scanner as defined in claim 3, wherein each of the p row units comprises also a reading register receiving the outgoing signals from the submatrix row reading circuits and storing the concerned m individual units'' reading results.
Claim 6
Dependent Claim
79 words
An electronic scanner as defined in claim 4, and further comprising a control logic namely made up of an address register displaying the identify of a crosspoint of the matrix and of a time allotter operating per cycles and providing, during a cycle, the various necessary signals for controlling the execution of operations which relate to the reading of condition of one or several m individual units assigned to the crosspoint whose identity is stored into the address register.
Claim 7
Dependent Claim
142 words
An electronic scanner as defined in claim 5, wherein the cycle of the time allotter comprises two parts: a first part during which the time allotter provides the necessary signals for controlling the current supply of one column conductor and of the conductors of a row of each submatrix, as well as for controlling the storing of the reading results by the reading registers of the various submatrices row units; and a second part during which the reading results of the various submatrices are processed in succession for the purpose of detecting and signalling the changes of condition, the duration of the time allotter cycle being constant and started cycle always being accomplished in full; the row and column circuits of the matrix always have therefore all this duration at their disposal for accomplishing their operation and then restore to rest condition.
Claim 8
Dependent Claim
247 words
An electronic scanner as defined in claim 6, wherein there is an analysis register such that during the second part of the time allotter cycle, a part of the address contained in the address register is used jointly with a first time-signal for interrogating the reading register of a row unit and to read the corresponding reading result which is written into said analysis register of the control logic, and is immediately subject to an analysis through the circuit of a change of condition detector, the result of this analysis then conditions the sending to the address register of an order to step forward, obtained from a second time signal and having for result to increase by one unit the said address part so that this latter provides the number of the next row unit to be interrogated; these two time signals are repeated, at least as many times as there exist row units, this makes it possible to interrogate them in succession if there is no change of condition; whereas, if a change of condition is detected, the address remains the same and the same row unit is interrogated in repeated fashion until the end of the time allotter cycle, and when the address part designating the row unit to be interrogated provides the number of the last one among them, the order to step forward is inhibited and the last row unit is interrogated in repeated fashion until the end of the time allotter cycle.
Claim 9
Dependent Claim
230 words
An electronic scanner as defined in claim 7, wherein means are provided for simulating the detection of a change of condition and inhibit thus the order to step forward, the corresponding row unit being interrogated in repeated fashion until the end of the time-allotter cycle, if the control logic has to read the condition of the individual units of only one particular crosspoint, when the time allotter reaches the end of an operation cycle and if no real or simulated change of condition has been detected, the address contained in the address register is modified, by the restoring to zero of the address part which provides the row unit number and by the addition of a unit to another address part which provides the column number; whereas all the elements of the control logic are restored into their initial condition so that a new reading and analyzing operation is undertaken, during a new full cycle of time allotter, and wherein when the time allotter reaches the end of an operation cycle and if a real or simulated change of condition has been detected, the address contained in the address register is held, as well as the reading results written in the analysis register; and the control logic suspends then its operation by producing a signal indicating that it holds useful information-information stored by the address register and the analysis register.
Claim 10
Dependent Claim
82 words
An electronic scanner as defined in claim 8, wherein means are provided for simulating a change of condition, at the end of the next cycle of the time allotter, when the address part which provides the column number is the address of the last column to be scanned, so as to make the scanning to stop, these means also providing particular signals which indicate that this stopping is effected, at end of the scanning, when no change of condition has been detected.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-01-25 | 1974-07-27 | 1975-01-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-25 | 1978-07-27 | 1979-01-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-25 | 1982-07-27 | 1983-01-26 | $7700.00 | Window Closed / Lapsed |