Patent US3752931A successfully refreshed from Google Patents.
US3752931A
Expired / Lapsed
US
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Time division multiplex exchanges
Assignee: International Standard Electric Corp
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Filing: 1972-01-19
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Granted: 1973-08-14
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Expires: 1992-01-19
Abstract
Abstract A TDM system is disclosed for use in multiplex exchanges in which trunk groups are divided into partial groups via switching devices which connect them to crosspoint groups. The switching devices are operated at the system clock rate, thereby eliminating the need for an address memory. The switchingdevices, by dividing the trunk groups into partial groups connected to various crosspoint groups enable a larger percentage of traffic to be switched within the crosspoint groups and thus reduce the need for links between crosspoint groups. Each crosspoint group is wired with the same number of partial groups, so that in case of total failure of a crosspoint group, traffic in all directions is still possible.
Inventors
- 👤 W Verstegen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 13:19
CPC Classifications
H; H04; H04Q; H04Q11/00; H04Q11/04
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
145 words
A switching system for time-division multiplex exchanges, comprising a plurality of connection points available for connection to PCM transmission equipment to receive TDM signals into and to transmit TDM signals out of a time-division multiplex exchange, a plurality of crosspoint switching groups forming part of said switching system and providing, in cooperation with said connection points, for the selective interconnection of incoming and outgoing paths for said TDM signals, switching means connected between said connection points and crosspoint switching groups for dividing the TDM signals from each connection point into as many partial groups as there are crosspoint switching groups and for distributing one partial group from each connection point to each crosspoint switching group, said crosspoint groups providing internal paths for routing selected partial groups of TDM signals between incoming and outgoing paths, and a plurality of links coupled to interconnect said crosspoint groups.
Claim 2
Dependent Claim
145 words
A switching system for time-division multiplex exchanges, comprising a plurality of connection points available for connection to PCM transmission equipment to receive TDM signals into and to transmit TDM signals out of a time-division multiplex exchange, a plurality of crosspoint switching groups forming part of said switching system and providing, in cooperation with said connection points, for the selective interconnection of incoming and outgoing paths for said TDM signals, switching means connected between said connection points and crosspoint switching groups for dividing the TDM signals from each connection point into as many partial groups as there are crosspoint switching groups and for distributing one partial group from each connection point to each crosspoint switching group, said crosspoint groups providing internal paths for routing selected partial groups of TDM signals between incoming and outgoing paths, and a plurality of links coupled to interconnect said crosspoint groups.
Claim 3
Dependent Claim
24 words
A system according to claim 1, in which each crosspoint group is wired with the same number of partial groups as there are directions.
Claim 4
Dependent Claim
25 words
A system according to claim 1, in which the switching devices for the formation of the partial groups are operated by the channel clock rate.
Claim 5
Dependent Claim
29 words
A system according to claim 1, in which several partial groups of different directions are interleaved with respect to time and connected to the input of a crosspoint group.
Claim 6
Dependent Claim
21 words
A system according to claim 1, in which the switching devices are built into the matching arrangements for the clock rates.
References Cited (Backward Citations)
US3263030A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-08-13 | 1977-02-12 | 1977-08-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-13 | 1981-02-12 | 1981-08-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-13 | 1985-02-12 | 1985-08-14 | $7700.00 | Window Closed / Lapsed |