US3770895A
Expired / Lapsed
US
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Dynamically switching time slot interchanger
Assignee: AT&T Inc
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Filing: 1971-12-02
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Granted: 1973-11-06
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Expires: 1991-12-02
Abstract
Abstract Selectively actuatable gates establish coupling paths between corresponding stages of two shift registers while at least one of the registers is being operated in its shifting mode with respect to signals being coupled through such paths. Each register has a full frame of time division multiplex signal storage capacity, and gate selection is accomplished by predetermined control signal patterns in respective control memory loops for the gates. Implementations for discrete device technology and magnetic single-wall domain technology are shown.
Inventors
- 👤 R Krupp
- 👤 L Tomko
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 12:59
CPC Classifications
G; G11; G11C; G11C19/00; G11C19/02; G11C19/08; G11C19/0875; G11C19/0883; H; H04; H04J; H04J3/00; H04J3/02; H04J3/12; H04Q; H04Q11/00; H04Q11/04; H04Q11/08
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
197 words
A time slot interchanger comprising first shift register means for receiving time division multiplex signals including a succession of time slot signals in recurrent time frames, said register means including a sufficient number of stages connected in cascade to store at one time at least a portion of each of the time slot signals of at least one of said time frames, means for coupling output signals from one or more of said stages at a time, second shift register means including a sufficient number of stages connected in cascade to store at one time at least a portion of each of the time slot signals of at least one of said time frames, said coupling means includes means for selectively coupling each of the last-mentioned stages to receive signals from only a different predetermined stage of said first shift register means, means for supplying shift control signals for operating said first and second shift register means, and means for actuating said coupling means while at least one of said first shift register means and said second shift register means is being operated as a shift register with respect to signals being coupled by said cOupling means.
Claim 2
Dependent Claim
197 words
A time slot interchanger comprising first shift register means for receiving time division multiplex signals including a succession of time slot signals in recurrent time frames, said register means including a sufficient number of stages connected in cascade to store at one time at least a portion of each of the time slot signals of at least one of said time frames, means for coupling output signals from one or more of said stages at a time, second shift register means including a sufficient number of stages connected in cascade to store at one time at least a portion of each of the time slot signals of at least one of said time frames, said coupling means includes means for selectively coupling each of the last-mentioned stages to receive signals from only a different predetermined stage of said first shift register means, means for supplying shift control signals for operating said first and second shift register means, and means for actuating said coupling means while at least one of said first shift register means and said second shift register means is being operated as a shift register with respect to signals being coupled by said cOupling means.
Claim 3
Dependent Claim
131 words
The time slot interchanger in accordance with claim 1 in which said means for supplying shift control signals comprises means for shifting time slot signals into said first shift register means at the same time that said second shift register means is operated for thereby, in effect, shifting time slot locations through said second register means, and said coupling means includes a coupling path from each stage of said first shift register means to a corresponding stage of said second shift register means, and means for applying each time slot signal in said first shift register means to a preselected one of said time slot locations in said second shift register means as such signal and location are shifted through correspondingly coupled stages of said first and second shift register means.
Claim 4
Dependent Claim
130 words
The time slot interchanger in accordance with claim 1 in which said shift register means comprise a sheet of magnetic material in which single wall domains can be moved, an overlay of magnetic material for providing magnetic poles to attract domains in the presence of a magnetic field in the plane of said sheet, said overlay being configured to define first and second domain propagation channels for said first and second shift register means, domain interaction positions at said output signal stages of said first channel, coupling channels from said positions to corresponding stages of said second channel, and control propagation channels for said actuating means for supplying a domain to each interaction position whenever a first channel domain is to be coupled to said second channel at such position.
Claim 5
Dependent Claim
32 words
The time slot interchanger in accordance with claim 1 in which said supplying means includes means for operating said first and second shift register means in alternate ones of said time slots.
Claim 6
Dependent Claim
42 words
The time slot interchanger in accordance with claim 1 in which said time division multiplex signals include plural signal bits in each time slot, and said coupling means comprises gating means at half-time-slot intervals along said first and second shift register means.
Claim 7
Dependent Claim
103 words
The time slot interchanger in accordance with claim 1 in which said first shift register means comprises a plurality of input shift registers each having an input to receive signals from a different signal path and each having an output, said second shift register means comprises a plurality of output shift registers each having an input and having an output to apply signals to a different output signal path, and said coupling means include means for applying output signals from stages of each of said input shift registers to inputs of corresponding stages of only a corresponding one of said output shift registers.
Claim 8
Dependent Claim
66 words
The time slot interchanger in accordance with claim 6 in which said first shift register means further comprises a distributing shift register means for receiving time division signals at an input thereof from a time division signal path, said distributing shift register means including means for periodically coupling an output from each stage thereof to an input of a different one of said input shift registers.
Claim 9
Dependent Claim
126 words
The time slot interchanger in accordance with claim 1 in which said coupling means comprises plural gating means, each interconnecting a stage of said first shift register means to only one stage of said second shift register means, said actuating means comprises a plurality of recirculating control memory loops, means for coupling an output of each of said control memory loops to a different one of said gating means for actuating such gating means recurrently in successive ones of said time frames in accordance with the pattern of signal representations stored in such memory loop, and said shift control signal supplying means further includes means for supplying shift control signals for operating said control memory loops in unison with said first and seCond shift register means.
Claim 10
Dependent Claim
34 words
The time slot interchanger in accordance with claim 8 in which said actuating means comprises time coded signaling means for writing a predetermined pattern of signal representations into each of said control memory loops.
Claim 11
Dependent Claim
39 words
The time slot interchanger in accordance with claim 9 in which said shift control signal supplying means comprises means for causing shifting in said first and second shift register means in opposite directions with respect to said gating means.
Claim 12
Dependent Claim
97 words
The time slot interchanger in accordance with claim 1 in which said selective coupling means comprises a buffer register, means for gating the contents of said first shift register means into said buffer register at the end of each of said time frames, gating means for coupling an output of each stage of said buffer register to only a different stage of said second shift register means, and means for selectively actuating said gating means in each time slot, the last-mentioned actuating means including means for operating the gating means while said second shift register is operating.
Claim 13
Dependent Claim
46 words
The time slot interchanger in accordance with claim 11 in which said shift control signal supplying means comprises means for shifting signals in said first shift register means and in said second shift register means in the same direction with respect to said selective coupling means.
Claim 14
Dependent Claim
47 words
The time slot interchanger in accordance with claim 11 in which said second shift register means further comprises means for controllably recirculating an output thereof to an input thereof, and means for enabling said recirculating means during only a first part of each of said time frames.
Claim 15
Dependent Claim
52 words
The time slot interchanger in accordance with claim 11 in which said means for supplying control signals comprises means for operating said first shift register means at a first signal rate, and means for operating said second shift register means at a second signal rate which is larger than said first rate.
Claim 16
Dependent Claim
105 words
In combination, a magnetic single-wall domain shift register having a plurality of selectively gated output connections at different stages thereof, a plurality of magnetic single-wall domain recirculating memory means for storing in each of said memory means a predetermined pattern of control signal representations, magnetic single-wall domain means for coupling an output of each of said recirculating memory means for actuating a different one of said gated output connections in accordance with a predetermined pattern of signal representations in such memory means, and means for supplying reorienting magnetic field shift control signals for operating said shift register and said memory and coupling means in unison.
Claim 17
Dependent Claim
105 words
In combination, a magnetic single-wall domain shift register having a plurality of selectively gated output connections at different stages thereof, a plurality of magnetic single-wall domain recirculating memory means for storing in each of said memory means a predetermined pattern of control signal representations, magnetic single-wall domain means for coupling an output of each of said recirculating memory means for actuating a different one of said gated output connections in accordance with a predetermined pattern of signal representations in such memory means, and means for supplying reorienting magnetic field shift control signals for operating said shift register and said memory and coupling means in unison.
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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) | 1976-11-05 | 1977-05-07 | 1977-11-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-05 | 1981-05-07 | 1981-11-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-05 | 1985-05-07 | 1985-11-06 | $7700.00 | Window Closed / Lapsed |