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Patent US3567865A successfully refreshed from Google Patents.
US3567865A
Expired / Lapsed
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Cross point switching network in a telecommunication system
Assignee: International Standard Electric Corp
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Filing: 1968-01-18
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Granted: 1971-03-02
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Expires: 1988-01-18
Abstract
Abstract In a telecommunication system having a plurality of line terminals and common control means, a novel switching network having a first and a second part is provided through which communication paths are established between selected pairs of the line terminals coupled to the first part. A first group of a plurality of output terminals of the first part is connected to a plurality of input terminals of the second part. A second group of the output terminals of the first part is directly connected to a selected group of output terminals of the second part. This manner of interconnection between the first and second parts eliminates the need for an additional switching network otherwise required in prior art devices for completing the communication paths between selected pairs of the line terminals.
Inventors
- 👤 Pe Tsi Chu
- 👤 Hans Helmut Adelaar
- 👤 Alois Rene Termote
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:51
CPC Classifications
H; H04; H04Q; H04Q3/00; H04Q3/42; H04Q3/54; H04Q3/545
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
128 words
A telecommunication switching system comprising: a switching network; a plurality of lines; common control means for establishing communication paths between selected pairs of lines through said switching network; wherein said switching network includes a first and a second switching part; said first switching part including a first and a second group of input terminals connected to said plurality of lines and a first and second group of output terminals; and said second switching part including a plurality of input terminals being connected to said first group of output terminals of said first switching part, and said second switching part also including a first and a second group of output terminals, the first group thereof being connected to said second group of input terminals of said first switching part.
Claim 2
Dependent Claim
128 words
A telecommunication switching system comprising: a switching network; a plurality of lines; common control means for establishing communication paths between selected pairs of lines through said switching network; wherein said switching network includes a first and a second switching part; said first switching part including a first and a second group of input terminals connected to said plurality of lines and a first and second group of output terminals; and said second switching part including a plurality of input terminals being connected to said first group of output terminals of said first switching part, and said second switching part also including a first and a second group of output terminals, the first group thereof being connected to said second group of input terminals of said first switching part.
Claim 3
Dependent Claim
49 words
The system in accordance with Claim 1, wherein said first switching part includes a plurality of line concentrators and trunk expanders interposed between said first group of input and output terminals thereof, and a plurality of trunk concentrators interposed between said second group of input and output terminals thereof.
Claim 4
Dependent Claim
20 words
The system in accordance with claim 2, wherein said second switching part includes a plurality of mixing grids. a first
Claim 5
Dependent Claim
47 words
The system in accordance with claim 3, wherein each one of said first group of output terminals of said first switching part is connectable to said second group of input terminals of said first switching part through the plurality of mixing grids of said second switching part.
Claim 6
Dependent Claim
59 words
The system in accordance with claim 3, said switching network further including a junctor circuit connected to said second group of input terminals of said second switching part, and an interconnecting network having a plurality of switching units, said interconnecting network being interposed between said junctor circuit and said second group of input terminals of said first switching part.
Claim 7
Dependent Claim
44 words
The system in accordance with claim 1, including a plurality of said switching networks and a plurality of said common control means, wherein respective ones of said plurality of common control means are connected to a different pair of said plurality of switching networks.
Claim 8
Dependent Claim
29 words
The system in accordance with claim 6, further including a plurality of signalling means, each of said signalling means being connected to a different pair of said switching networks.
Claim 9
Dependent Claim
20 words
The system in accordance with claim 6, further including an intermediate distributing frame for interconnecting said plurality of switching networks.
Claim 10
Dependent Claim
18 words
The system in accordance with claim 6, said common control means including peripheral circuits and common program-controlled data-processors.
Claim 11
Dependent Claim
31 words
The system in accordance with claim 3, wherein said mixing grids include two-stage switches with a connection between each switch of the first stage and each switch of the second stage.
Claim 12
Dependent Claim
52 words
The system in accordance with claim 10, wherein the switches of said second stage have at least two output terminals included in said first group of output terminals of said second switching part and at least two output terminals included in said second group of output terminals of said second switching part.
Claim 13
Dependent Claim
64 words
The system in accordance with claim 1, wherein said second switching part includes a plurality of switches, at least two of said switches forming an incoming section and at least two of said switches forming an outgoing section respectively, said incoming and outgoing sections forming mixing grids and a link connecting every switch of the incoming section and every switch of the outgoing section.
Claim 14
Dependent Claim
32 words
The system in accordance with claim 12, wherein the number of links in said mixing grids is smaller than the number of outside terminals on the input side of said mixing grids.
Claim 15
Dependent Claim
37 words
The system in accordance with claim 2, further including a junctor circuit coupled between said second group of input terminals of said first switching part and said second group of output terminals of said second switching part.
Claim 16
Dependent Claim
17 words
The system in accordance with claim 14, wherein a signalling means is coupled to said junctor circuit.
Claim 17
Dependent Claim
48 words
The system in accordance with claim 15, further including a plurality of incoming trunk circuits connected to said trunk expanders and a plurality of outgoing trunk circuits connected to said trunk concentrators, wherein said signalling means is also coupled to said plurality of incoming and outgoing trunk circuits.
Claim 18
Dependent Claim
25 words
The system in accordance with claim 1, wherein said switching network includes a plurality of switching stages, each stage having a coordinate array of cross-points.
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) | 1974-03-01 | 1974-08-31 | 1975-03-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-01 | 1978-08-31 | 1979-03-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-01 | 1982-08-31 | 1983-03-02 | $7700.00 | Window Closed / Lapsed |