US3701853A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Selection systems for electrical circuits or equipments
Assignee: International Standard Electric Corp
•
Filing: 1970-02-27
•
Granted: 1972-10-31
•
Expires: 1990-02-27
Abstract
Abstract Selection system applicable, namely, in telephone exchanges for the calls to subscriber lines grouped under a same number. It enables selecting a free line (1g) out of a group of lines with the purpose of connecting it to a common unit (AL) through a connecting network (RC). A device (MA) designates the lines in the called group. A circuit (CSI) selects one free line out of the designated lines, according to an order of priority provided by a distributing circuit (CDM). Renewing means enable selecting another line when the connection does not take place, in case of congestion. The circuit (CDM) then gives highest priority to the line immediately following the one unable to be connected to.
Inventors
- 👤 Georges A Duval
- 👤 Francois Hernandez
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:17
CPC Classifications
H; H04; H04Q; H04Q3/00; H04Q3/0004
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
216 words
An automatic telecommunications switching system including switching network, a plurality of lines each connected to an outlet of the switching network, said outlets being grouped into a plurality of multiple outlet sections, certain of said lines being grouped under a common call number grouping assigned to the group, a plurality of inlets to said network, common control equipment connected to the inlets of the switching network, the invention comprising an identification circuit for identifying an available line of a called group for selection, means for selecting an identified line for attempting the completion of a connection path thereto, a priority control circuit responsive to selections for according identification priorities for selection, said priority control circuit responsive to selection of a line in one outlet section for according said section the lowest priority for subsequent selections, time delay means responsive to start of an attempt to complete a connection path to an identified and selected line for initiating a timed period, selection renewal means responsive to the termination of the delay period without a connection having been made for cancelling the prior identification and selection and for selecting another section having lines from the called group, and means responsive to a plurality of failures to complete a connection for returning a busy signal from the called group.
Claim 2
Dependent Claim
216 words
An automatic telecommunications switching system including switching network, a plurality of lines each connected to an outlet of the switching network, said outlets being grouped into a plurality of multiple outlet sections, certain of said lines being grouped under a common call number grouping assigned to the group, a plurality of inlets to said network, common control equipment connected to the inlets of the switching network, the invention comprising an identification circuit for identifying an available line of a called group for selection, means for selecting an identified line for attempting the completion of a connection path thereto, a priority control circuit responsive to selections for according identification priorities for selection, said priority control circuit responsive to selection of a line in one outlet section for according said section the lowest priority for subsequent selections, time delay means responsive to start of an attempt to complete a connection path to an identified and selected line for initiating a timed period, selection renewal means responsive to the termination of the delay period without a connection having been made for cancelling the prior identification and selection and for selecting another section having lines from the called group, and means responsive to a plurality of failures to complete a connection for returning a busy signal from the called group.
Claim 3
Dependent Claim
38 words
A system as claimed in claim 1, wherein there is a counting means which counts attempts at completing a path, and means responsive to a predetermined count having been reached by said counting means for terminating further attempts.
Claim 4
Dependent Claim
82 words
System as claimed in claim 1, wherein the switching network includes at least one primary selection stage made up of several sections constituted by multiswitches whose outlets are mUltipled between them and to which are connected the lines, and wherein various lines of a line group are connected to the same rank outlets of different sections which makes it possible to select and identify simply a line of a group by selecting and identifying the primary section to which it is connected.
Claim 5
Dependent Claim
50 words
System as claimed in claim 1, wherein said identification means includes cut-in means responsive to a first condition at a line having initiated a call to a group and operative when no line of the called group is available, for selecting and connecting to a busy line of said group.
Claim 6
Dependent Claim
54 words
System as claimed in claim 1 further including busy condition delay means operative when the lines of a group are identified and measuring the time devoted to the choice of an available line; and means operative to when no line is chosen at the end of this time, switch the identification circuit for cut-in.
References Cited (Backward Citations)
US3519755A
Cited
US3536844A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-10-31 | 1976-05-01 | 1976-10-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-31 | 1980-05-01 | 1980-10-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-31 | 1984-05-01 | 1984-10-31 | $7700.00 | Window Closed / Lapsed |