US4398285A
Expired / Lapsed
US
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Time-division multiplex switching network
Assignee: Siemens AG
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Filing: 1981-02-05
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Granted: 1983-08-09
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Expires: 2001-02-05
Abstract
Abstract A time-division multiplex switching network is constructed of units designed as time stages which operate blocking-free and which are multiply divided. A plurality of units of identical structure to a plurality of switching units of a switching network portion is assigned to each switching network portion, the plurality of units being operated as multiplexers at which the outgoing time-division multiplex lines are connected and whose normally non-utilized outputs can be connected by way of switches to other time-division multiplex lines extending from other switching network portions. Upon failure of the latter switching network portions, the switches are closed for rerouting the traffic through the system.
Inventors
- 👤 Karl A. Lutz
- 👤 Eberhard Knorpp
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 11:33
CPC Classifications
H; H04; H04Q; H04Q11/00; H04Q11/04; H04Q11/08
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
196 words
A time-division multiplex switching network, comprising: a plurality of switching units, constructed as time stages, arranged in separate groups, and operable to chronologically and spatially assign time channels; a respective plurality of time-division multiplex lines for an incoming transmission direction connected to said switching units, such that the lines connected to a switching unit of one group are also connected to a corresponding switching unit in each other group; per switching unit group, a plurality of multiplexers equal in number to the number of switching units and each including a plurality of inputs, a plurality of normally-used outputs equal in number to the number of said incoming lines connected to a switching unit, and a plurality of normally-unused outputs, said inputs of each of said multiplexers divided into groups of equal number and each such group connected to a like number of outputs of said switching units such that each switching unit of a switching unit group is connected to each multiplexer assigned to that switching unit group; and a plurality of normally-open switches connected between at least a portion of said normally-used outputs and corresponding normally-used outputs and operated when the respective switching portion fails.
Claim 2
Dependent Claim
196 words
A time-division multiplex switching network, comprising: a plurality of switching units, constructed as time stages, arranged in separate groups, and operable to chronologically and spatially assign time channels; a respective plurality of time-division multiplex lines for an incoming transmission direction connected to said switching units, such that the lines connected to a switching unit of one group are also connected to a corresponding switching unit in each other group; per switching unit group, a plurality of multiplexers equal in number to the number of switching units and each including a plurality of inputs, a plurality of normally-used outputs equal in number to the number of said incoming lines connected to a switching unit, and a plurality of normally-unused outputs, said inputs of each of said multiplexers divided into groups of equal number and each such group connected to a like number of outputs of said switching units such that each switching unit of a switching unit group is connected to each multiplexer assigned to that switching unit group; and a plurality of normally-open switches connected between at least a portion of said normally-used outputs and corresponding normally-used outputs and operated when the respective switching portion fails.
Claim 3
Dependent Claim
17 words
The time-division switching network of claim 1, wherein said multiplexers are constructed identical to said switching units.
Claim 4
Dependent Claim
24 words
The time-division switching network of claim 1, comprising: a respective independent power supply and a respective independent clock supply for each of the groups.
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) | 1986-08-08 | 1987-02-07 | 1987-08-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-08-08 | 1991-02-07 | 1991-08-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-08-08 | 1995-02-07 | 1995-08-09 | $7700.00 | Window Closed / Lapsed |