US4023141A
Expired / Lapsed
US
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Efficient one-sided rearrangeable multistage switching network
Assignee: AT&T Inc
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Filing: 1976-06-01
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Granted: 1977-05-10
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Expires: 1996-06-01
Abstract
Abstract Disclosed is a one-sided rearrangeable connecting network employing fewer elemental switches, or crosspoints, than prior art networks of corresponding capability. In a three stage embodiment of this invention, the first stage comprises n input-mixed rearrangeable switches connected to input terminals, the second stage comprises n one-sided rearrangeable switches connected to the input-mixed switches of the first stage and n/2 two-sided rearrangeable switches interconnecting pairs of the one-sided rearrangeable switches of the second stage, and the third stage comprises n output-mixed rearrangeable switches connected to the one sided switches of the second stage and to output terminals.
Inventors
- 👤 Frank Kwangming Hwang
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 10:47
CPC Classifications
H; H04; H04Q; H04Q3/00; H04Q3/0008; H04Q3/0012
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
61 words
A multistage switching network subdivided into a first stage, a second stage and a third stage characterized in that: said first stage comprises an n plurality of input-mixed rearrangeable switches; said second stage comprises an n plurality of one-sided rearrangeable switches and an n/2 plurality of two-sided rearrangeable switches; and said third stage comprises an n plurality of output-mixed rearrangeable switches.
Claim 2
Dependent Claim
61 words
A multistage switching network subdivided into a first stage, a second stage and a third stage characterized in that: said first stage comprises an n plurality of input-mixed rearrangeable switches; said second stage comprises an n plurality of one-sided rearrangeable switches and an n/2 plurality of two-sided rearrangeable switches; and said third stage comprises an n plurality of output-mixed rearrangeable switches.
Claim 3
Dependent Claim
70 words
A multistage switching network having a first stage, a second stage connected to said first stage and a third stage connected to said second stage characterized in that said first stage comprises an n plurality of input-mixed rearrangeable switches; said second stage comprises an n plurality of one-sided rearrangeable switches and an n/2 plurality of two-sided rearrangeable switches; and said third stage comprises an n plurality of output-mixed rearrangeable switches.
Claim 4
Dependent Claim
70 words
A multistage switching network having a first stage, a second stage connected to said first stage and a third stage connected to said second stage characterized in that said first stage comprises an n plurality of input-mixed rearrangeable switches; said second stage comprises an n plurality of one-sided rearrangeable switches and an n/2 plurality of two-sided rearrangeable switches; and said third stage comprises an n plurality of output-mixed rearrangeable switches.
Claim 5
Dependent Claim
108 words
A three stage one-sided rearrangeable switching network comprising n input-mixed rearrangeable switches associated with the first stage of said network and connected to input terminals, one-sided rearrangeable switches associated with the second stage of said network and connected to said first stage and output-mixed rearrangeable switches associated with the third stage of said network and connected to said second stage and to output terminals characterized in that: said second stage comprises no more than n of said one-sided rearrangeable switches each having 2n input/output (I/O) links and further comprises a plurality of two-sided rearrangeable switches having input and output links that interconnect pairs of said one-sided rearrangeable switches.
Claim 6
Dependent Claim
108 words
A three stage one-sided rearrangeable switching network comprising n input-mixed rearrangeable switches associated with the first stage of said network and connected to input terminals, one-sided rearrangeable switches associated with the second stage of said network and connected to said first stage and output-mixed rearrangeable switches associated with the third stage of said network and connected to said second stage and to output terminals characterized in that: said second stage comprises no more than n of said one-sided rearrangeable switches each having 2n input/output (I/O) links and further comprises a plurality of two-sided rearrangeable switches having input and output links that interconnect pairs of said one-sided rearrangeable switches.
Claim 7
Dependent Claim
32 words
The switching network of claim 3 wherein said second stage includes an n/2 plurality of said two-sided rearrangeable switches each having 2n of said input links and 2n of said output links.
Claim 8
Dependent Claim
65 words
The switching network of claim 4 wherein said 2n input links of each of said two-sided rearrangeable switches are connected to said 2n I/O links of one of said one-sided rearrangeable switches in said pairs and said 2n output links of each of said two-sided rearrangeable switches are connected to the 2n I/O links of the other of said one-sided rearrangeable switches in said pairs.
Claim 9
Dependent Claim
53 words
The switching network of claim 5 wherein each of said two-sided rearrangeable switches comprises: a first two-sided rearrangeable switch having two input links and 2n/3 output links; and a second two-sided rearrangeable switch having 2n output links and 2n/3 input links connected to said 2n/3 output links of said first two-sided rearrangeable switch.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-05-09 | 1980-11-08 | 1981-05-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-05-09 | 1984-11-08 | 1985-05-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-05-09 | 1988-11-08 | 1989-05-10 | $7700.00 | Window Closed / Lapsed |