US3740480A
Expired / Lapsed
US
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Time division multiplex switching system utilizing all time division techniques
Assignee: AT&T Inc
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Filing: 1971-12-27
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Granted: 1973-06-19
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Expires: 1991-12-27
Abstract
Abstract Time slot interchangers in each of plural input time division multiplex signal paths to a switching network shift input time slot signals to respective operational time slots corresponding to different switching circuits. A mass serial-parallel converter takes all of the input path signals from the mentioned interchangers in each time slot and steers them in series to the switching circuit corresponding to that operational time slot. Further, time slot interchangers shift the signals in the respective switching circuits to new time slot positions corresponding to different output circuits. Another converter steers the new time slot signals from all of the switching circuits in series to the output circuit corresponding to that new time slot. Finally, time slot interchangers in each of the output circuits shift the signals in their respective output circuits to destination time slot positions thereby completing both the line switching and the time slot interchanging operations.
Inventors
- 👤 R Krupp
- 👤 L Tomko
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:50
CPC Classifications
H; H04; H04Q; H04Q11/00; H04Q11/04
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
224 words
A time division multiplex switching network for selectively interconnecting a plurality of time slot signals on each of a plurality of input lines to selectable output lines in different selectable time slots of recurrent time frames, said network comprising means, connected in each of said input lines, for time slot interchanging signals in such lines to respective selectable interchanger output time slots, converter means, operative in each of said interchanger output time slots, for applying signals at interchanger outputs for all of said input lines in word-series to a different converter means output path corresponding to such time slot, a pluraity of time slot interchanging switching paths, each of said paths being coupled to a different one of said converter means output paths and including a different time slot interchanger means for transferring each input time slot signal in such interchanging switching path to a time slot corresponding to a particular one of said output lines, further means, operative in each output time slot of said switching paths, for applying the signals from outputs of all of such switching paths in word-series to respective ones of said output lines, and further time slot interchanging means in each of said output lines for shifting time slot signals in such line to respective predetermined output time slots for establishing time division multiplex communication through said network.
Claim 2
Dependent Claim
224 words
A time division multiplex switching network for selectively interconnecting a plurality of time slot signals on each of a plurality of input lines to selectable output lines in different selectable time slots of recurrent time frames, said network comprising means, connected in each of said input lines, for time slot interchanging signals in such lines to respective selectable interchanger output time slots, converter means, operative in each of said interchanger output time slots, for applying signals at interchanger outputs for all of said input lines in word-series to a different converter means output path corresponding to such time slot, a pluraity of time slot interchanging switching paths, each of said paths being coupled to a different one of said converter means output paths and including a different time slot interchanger means for transferring each input time slot signal in such interchanging switching path to a time slot corresponding to a particular one of said output lines, further means, operative in each output time slot of said switching paths, for applying the signals from outputs of all of such switching paths in word-series to respective ones of said output lines, and further time slot interchanging means in each of said output lines for shifting time slot signals in such line to respective predetermined output time slots for establishing time division multiplex communication through said network.
Claim 3
Dependent Claim
108 words
In combination, at least one input circuit for time division multiplex signals, said signals including a predetermined number of time slot signals in recurring time frames, a plurality of time slot interchangers, one corresponding to each time slot of a signal frame, each interchanger having an input and an output, means for applying each time slot signal of a frame of signals from said circuit to an input of its corresponding one of said interchangers, respectively, in time slot signal parallel, and means for controlling each of said interchangers to switch each time slot signals applied thereto to a selectable time slot in the output of such interchanger.
Claim 4
Dependent Claim
108 words
In combination, at least one input circuit for time division multiplex signals, said signals including a predetermined number of time slot signals in recurring time frames, a plurality of time slot interchangers, one corresponding to each time slot of a signal frame, each interchanger having an input and an output, means for applying each time slot signal of a frame of signals from said circuit to an input of its corresponding one of said interchangers, respectively, in time slot signal parallel, and means for controlling each of said interchangers to switch each time slot signals applied thereto to a selectable time slot in the output of such interchanger.
Claim 5
Dependent Claim
116 words
In a multistage time divisIon switching network for providing selectable communication connections in different time slots of recurrent communication signal time frames, a first stage comprising time slot interchanging means, said stage having a plurality of outputs, a second stage comprising a plurality of time slot interchangers, one for each time slot in a frame in an output of said first stage time slot interchanging means, and interstage coupling means between said first and second stages and comprising means for converting each set of simultaneously occurring time slot signals from different outputs of said first stage into a series train of signals for application of each such set to a different interchanger of said second stage.
Claim 6
Dependent Claim
116 words
In a multistage time divisIon switching network for providing selectable communication connections in different time slots of recurrent communication signal time frames, a first stage comprising time slot interchanging means, said stage having a plurality of outputs, a second stage comprising a plurality of time slot interchangers, one for each time slot in a frame in an output of said first stage time slot interchanging means, and interstage coupling means between said first and second stages and comprising means for converting each set of simultaneously occurring time slot signals from different outputs of said first stage into a series train of signals for application of each such set to a different interchanger of said second stage.
Claim 7
Dependent Claim
178 words
In a multistage time division switching network for supplying selectable communication connections in different time slots of recurrent communication signal time frames, a pluraity of time slot interchangers in each of said stages, each interchanger having an input connection and an output connection, and all interchangers of a stage being formed into at least one group, means for coupling said stages of interchangers in a predetermined tandem sequence extending from a network input stage to a network output stage, said coupling means comprising between each pair of successive stages in said sequence at least one mass series-parallel converter connected between a group of interchangers of a first stage and a group of interchangers of a following stage in said sequence, interchangers of said input stage being grouped so all interchanger outputs of a group are coupled to a single one of said converters, interchangers of said output stage being grouped so all interchanger inputs of a group are coupled from a single one of said converters, and at least one intermediate interchanger stage is included in said sequence.
Claim 8
Dependent Claim
178 words
In a multistage time division switching network for supplying selectable communication connections in different time slots of recurrent communication signal time frames, a pluraity of time slot interchangers in each of said stages, each interchanger having an input connection and an output connection, and all interchangers of a stage being formed into at least one group, means for coupling said stages of interchangers in a predetermined tandem sequence extending from a network input stage to a network output stage, said coupling means comprising between each pair of successive stages in said sequence at least one mass series-parallel converter connected between a group of interchangers of a first stage and a group of interchangers of a following stage in said sequence, interchangers of said input stage being grouped so all interchanger outputs of a group are coupled to a single one of said converters, interchangers of said output stage being grouped so all interchanger inputs of a group are coupled from a single one of said converters, and at least one intermediate interchanger stage is included in said sequence.
Claim 9
Dependent Claim
23 words
The network in accordance with claim 4 in which only a single intermediate stage of time slot interchangers is provided in said sequence.
Claim 10
Dependent Claim
70 words
The network in accordance with claim 4 in which a plurality of said intermediate stages are provided in an intermediate stage sequence in which a first stage of said intermediate sequence has the interchangers thereof grouped into plural groups, a last stage of said intermediate sequence has the interchangers thereof grouped into plural groups, and said intermediate sequence includes a further interchanger stage having interchangers thereof grouped into plural groups.
Claim 11
Dependent Claim
93 words
The network in accordance with claim 6 in which said coupling means converters include means for connecting all inputs of each group of interchangers of said further stage to receive from a single converter, means for connecting all outputs of each group of interchangers of said further stage to a single converter, means for cross coupling each group of said input stage interchangers to different groups of said first intermediate stage interchangers, and means for cross coupling each group of said last intermediate stage interchangers to different groups of said output stage interchangers.
Claim 12
Dependent Claim
93 words
The network in accordance with claim 6 in which said coupling means converters include means for connecting all inputs of each group of interchangers of said further stage to receive from a different converter, means for connecting all outputs of each group of interchangers of said further stage to a single converter, means for cross coupling outputs of each group of first intermediate stage interchangers to different ones of said converters, and means for cross coupling inputs of each group of last intermediate stage interchangers to receive from different ones of said converters.
Claim 13
Dependent Claim
165 words
In a multistage time division switching network for providing selectable communication connections in different time slots of recurrent communication signal time frames, a plurality of time division multiplex input paths and a plurality of time division multiplex output patHs in each stage of said network, a plurality of time slot interchanging means for each of said stages, each such interchanging means being connected to receive time division signals from a different one of the input paths of such stage, and at least one converting means in each of said stages, except the final stage, in said network, each said converting means being operable to convert an input time slot number into an output path number and comprising a plurality of signal propagation circuits, one for each time slot of a time division signal frame in said interchanging means, and means for steering time slot signals in each time slot of a signal frame in said input paths to a different one of said propagation circuits.
Claim 14
Dependent Claim
165 words
In a multistage time division switching network for providing selectable communication connections in different time slots of recurrent communication signal time frames, a plurality of time division multiplex input paths and a plurality of time division multiplex output patHs in each stage of said network, a plurality of time slot interchanging means for each of said stages, each such interchanging means being connected to receive time division signals from a different one of the input paths of such stage, and at least one converting means in each of said stages, except the final stage, in said network, each said converting means being operable to convert an input time slot number into an output path number and comprising a plurality of signal propagation circuits, one for each time slot of a time division signal frame in said interchanging means, and means for steering time slot signals in each time slot of a signal frame in said input paths to a different one of said propagation circuits.
Claim 15
Dependent Claim
35 words
The network in accordance with claim 9 in which each input path of a stage of said network is connected through a single one of said interchanging means to said converting means of such stage.
Claim 16
Dependent Claim
109 words
The network in accordance with claim 9 in which each input path of at least one stage of said network is connected through n of said interchanging means of such stage to said converting means of such stage, a plurality n of said converting means are provided in such stage to provide for such stage a total number of said output paths equal to n times the total number of time slots per frame of signals in outputs of said interchanging means of such stage, and means are provided for coupling the output of each of said n interchanging means to a different one of said n converting means.
Claim 17
Dependent Claim
68 words
The switching network in accordance with claim 9 in which said network includes three tandem connected stages and each of said converting means comprises means for receiving the outputs of all time slot interchangers of the preceding stage in said sequence, and means for coupling output circuits of such converting means to input circuits of all time slot interchangers, respectively, of the next succeeding stage in said sequence.
Claim 18
Dependent Claim
65 words
The switching network in accordance with claim 9 in which each of said steering means comprises a two-dimensional shift register including means for shifting signals from said input paths in one direction along a plurality of signal shifting paths, respectively, and means for shifting signals along a plurality of paths which are perpendicular to and intersect the first-mentioned shifting paths to said output paths, respectively.
Claim 19
Dependent Claim
40 words
The switching network in accordance with claim 9 in which each of said converting means comprises means for delaying by a different number of time slots the time slot signals received in each input time slot of such converting means.
References Cited (Backward Citations)
US3632883A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-06-18 | 1976-12-18 | 1977-06-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-18 | 1980-12-18 | 1981-06-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-18 | 1984-12-18 | 1985-06-19 | $7700.00 | Window Closed / Lapsed |