US3794777A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Distributor for a centrally controlled telephone switching system
Assignee: International Standard Electric Corp
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Filing: 1972-06-29
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Granted: 1974-02-26
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Expires: 1992-06-29
Abstract
Abstract A distributor is disclosed for a centrally controlled telephone exchange enabling the control of bistables distributed in groups. The distributor receives from the central unit for a group of bistables to be controlled a control data item indicating the bistables to be set in position 1 and 0, and an inhibition data item indicating the bistables whose position must remain unchanged and serving to mask the elements of the control data corresponding to these bistables. The central unit function is thus limited to the elaboration and to the transmission only of the control data elements intended to certain components of an addressed group.
Inventors
- 👤 C Bouchet
- 👤 V Tomasovitch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 05:26
CPC Classifications
H; H04; H04Q; H04Q3/00; H04Q3/42; H04Q3/54; H04Q3/545
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
154 words
In a distributor for a switching system, a control circuit and a control matrix, said control circuit comprising a plurality of components controlled from a central unit, first record-ing means coupled to receive and store address data from the central unit, second recording means coupled to receive and store control data from the central unit, third recording means coupled to receive control data from the central unit specifying the states that one or several components of a group must take, fourth recording means provided for receiving inhibition data designating components whose state must remain unchanged, masking means coupled to receive the control and inhibition data from the respective third recording means and the fourth recording means to provide masking signals and control signals, and means coupling said masking signals and said control signals to said control matrix, said control matrix responsive to said masking and control signals to direct signals through a switching system.
Claim 2
Dependent Claim
154 words
In a distributor for a switching system, a control circuit and a control matrix, said control circuit comprising a plurality of components controlled from a central unit, first record-ing means coupled to receive and store address data from the central unit, second recording means coupled to receive and store control data from the central unit, third recording means coupled to receive control data from the central unit specifying the states that one or several components of a group must take, fourth recording means provided for receiving inhibition data designating components whose state must remain unchanged, masking means coupled to receive the control and inhibition data from the respective third recording means and the fourth recording means to provide masking signals and control signals, and means coupling said masking signals and said control signals to said control matrix, said control matrix responsive to said masking and control signals to direct signals through a switching system.
Claim 3
Dependent Claim
43 words
The invention as claimed in claim 1, in which the first, second, third and fourth recording means include registers and the masking means includes a plurality of logic devices responsive to control and inhibit data to provide said masking signals and control signals.
Claim 4
Dependent Claim
43 words
The invention as claimed in claim 1, in which the control matrix includes a plurality of bistable devices, and means are provided to couple the bistable devices to receive said respective masking signals and said control signals for bias of said bistable devices.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-02-25 | 1977-08-27 | 1978-02-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-25 | 1981-08-27 | 1982-02-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-25 | 1985-08-27 | 1986-02-26 | $7700.00 | Window Closed / Lapsed |