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US4470139A
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Switching network for use in a time division multiplex system
Assignee: Nortel Networks Ltd
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Filing: 1981-12-28
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Granted: 1984-09-04
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Expires: 2001-12-28
Abstract
Abstract A non-blocking switching network for use in a TDM (time division multiplex) system for switching digital signals carried on incoming buses to outgoing buses (e.g. in a telephone switching office) is disclosed. Each outgoing bus has associated therewith storage devices capable of storing, at least temporarily, all the data received from all the incoming buses. Appropriate control equipment controls which of the incoming channels, stored in the respective storage devices, is applied to the respective outgoing bus. In short, each outgoing bus has associated with itself, dedicated storage devices from which data is applied only to that respective outgoing bus. By this technique, every outgoing bus has access to all the channels on all the incoming buses.
Inventors
- 👤 Ernst A. Munter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 08:44
CPC Classifications
H; H04; H04Q; H04Q11/00; H04Q11/04; H04Q11/08
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
107 words
A switching network for use in a TDM (time division multiplex) system for switching digital signals carried in timeslots on N incoming buses to timeslots on M outgoing buses, wherein N and M are positive integers, N≧2, and M≧2, said network comprising: a plurality of storage means, said plurality of storage means being divided into N first groupings of M storage means each, each said first grouping being responsive to a respective incoming bus; and each outgoing bus being responsive to a respective one of M second groupings of said storage means, each said second grouping comprising N storage means, one from each of said first groupings.
Claim 2
Dependent Claim
107 words
A switching network for use in a TDM (time division multiplex) system for switching digital signals carried in timeslots on N incoming buses to timeslots on M outgoing buses, wherein N and M are positive integers, N≧2, and M≧2, said network comprising: a plurality of storage means, said plurality of storage means being divided into N first groupings of M storage means each, each said first grouping being responsive to a respective incoming bus; and each outgoing bus being responsive to a respective one of M second groupings of said storage means, each said second grouping comprising N storage means, one from each of said first groupings.
Claim 3
Dependent Claim
28 words
The switching network of claim 1 wherein each bus of both said incoming buses and said outgoing buses carries the same number of timeslots as the other buses.
Claim 4
Dependent Claim
12 words
The switching network of claim 1 or 2 wherein N equals M.
Claim 5
Dependent Claim
28 words
The switching network of claim 1 or 2 wherein each said storage means has the capacity to store all the data received from one bus during one frame.
Claim 6
Dependent Claim
102 words
A switching network for use in a TDM (time division multiplex) system for switching digital signals carried in timeslots on N incoming buses to timeslots on N outgoing buses, wherein N is a positive integer, N≧2, said network comprising: a plurality of storage means, said plurality of storage means comprising N first groupings of N storage means each, each said first grouping being responsive to a respective incoming bus; and each outgoing bus being responsive to a respective one of N second groupings of said storage means, each said second grouping comprising N storage means, one from each of said first groupings.
Claim 7
Dependent Claim
102 words
A switching network for use in a TDM (time division multiplex) system for switching digital signals carried in timeslots on N incoming buses to timeslots on N outgoing buses, wherein N is a positive integer, N≧2, said network comprising: a plurality of storage means, said plurality of storage means comprising N first groupings of N storage means each, each said first grouping being responsive to a respective incoming bus; and each outgoing bus being responsive to a respective one of N second groupings of said storage means, each said second grouping comprising N storage means, one from each of said first groupings.
Claim 8
Dependent Claim
10 words
The switching network of claim 5 wherein N equals two.
Claim 9
Dependent Claim
10 words
The switching network of claim 5 wherein N equals four.
Claim 10
Independent Claim
107 words
A method for use in a TDM (time division multiplex) system for switching digital signals carried in timeslots on N incoming buses to timeslots on M outgoing buses, wherein N and M are positive integers, N≧2, and M≧2, said method comprising: storing the data received from an incoming bus in a respective one of N first groupings, wherein each one of said first groupings comprises M storage means; and applying the data from a second grouping of storage means to a respective outgoing bus, wherein there are M second groupings and wherein each said second grouping comprises N storage means, one from each of said first groupings.
Claim 11
Independent Claim
107 words
A method for use in a TDM (time division multiplex) system for switching digital signals carried in timeslots on N incoming buses to timeslots on M outgoing buses, wherein N and M are positive integers, N≧2, and M≧2, said method comprising: storing the data received from an incoming bus in a respective one of N first groupings, wherein each one of said first groupings comprises M storage means; and applying the data from a second grouping of storage means to a respective outgoing bus, wherein there are M second groupings and wherein each said second grouping comprises N storage means, one from each of said first groupings.
Claim 12
Dependent Claim
9 words
The method of claim 8 wherein N equals M.
Claim 13
Dependent Claim
9 words
The method of claim 9 wherein N equals two.
Claim 14
Dependent Claim
9 words
The method of claim 9 wherein N equals four.
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USPTO Annuity & Maintenance Windows
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|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-09-04 | 1988-03-05 | 1988-09-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-09-04 | 1992-03-05 | 1992-09-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-09-04 | 1996-03-05 | 1996-09-04 | $7700.00 | Window Closed / Lapsed |