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US4344170A
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Time division switching circuit with time slot interchange
Assignee: NTT Inc
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Filing: 1979-10-01
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Granted: 1982-08-10
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Expires: 1999-10-01
Abstract
Abstract A time division switching circuit with time slot interchange uses an input shift register to convert one-frame binary coded input data of time division multiplex type from an incoming line into a parallel bit output. The parallel bit output undergoes gate control of a gate matrix and its bit array is statically changed to a given bit array. The on/off control of the gate at the cross point of the gate matrix is conducted according to parallel bit outputs of a plurality of control shift registers which stores predetermined contents. The one-frame bit data thus exchanged are supplied to an output shift register. They are transmitted to an outgoing line as binary coded output data of time division multiplex type.
Inventors
- 👤 Takemi Arita
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 16:05
CPC Classifications
H; H04; H04Q; H04Q11/00; H04Q11/04
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
152 words
A time division switching circuit with time slot interchange comprising: an input shift register for converting one-frame binary coded data of time division multiplex type from an incoming line into a parallel bit output; a gate matrix having cross points connected to bit output lines of said input shift register; a plurality of control shift registers connected to the gates of said gate matrix such that each control shift register corresponds to a respective bit of an output frame, and having predetermined contents for achieving on/off control of the respective gates; and an output shift register coupled to said gate matrix for simultaneously receiving parallel bit outputs from said gate matrix, the bit array of which have been statically changed from the input data by said gate matrix, and for transmitting the parallel bit output data thus exchanged to an outgoing line as binary coded output data of time division multiplex type.
Claim 2
Dependent Claim
152 words
A time division switching circuit with time slot interchange comprising: an input shift register for converting one-frame binary coded data of time division multiplex type from an incoming line into a parallel bit output; a gate matrix having cross points connected to bit output lines of said input shift register; a plurality of control shift registers connected to the gates of said gate matrix such that each control shift register corresponds to a respective bit of an output frame, and having predetermined contents for achieving on/off control of the respective gates; and an output shift register coupled to said gate matrix for simultaneously receiving parallel bit outputs from said gate matrix, the bit array of which have been statically changed from the input data by said gate matrix, and for transmitting the parallel bit output data thus exchanged to an outgoing line as binary coded output data of time division multiplex type.
Claim 3
Dependent Claim
25 words
The time division switching circuit of claim 1, wherein the gates of said gate matrix located at said cross points form columns of said matrix.
Claim 4
Dependent Claim
40 words
The time division switching circuit of claim 2, wherein said control shift registers each comprise a plurality of bits, one bit of each control shift register being connected to one cross point of a respective column of said gate matrix.
Claim 5
Dependent Claim
38 words
The time division switching circuit of any one of claim 1-3, further comprising a multiplexer coupled between said incoming line and said input shift register; and a demultiplexer coupled between said output shift register and said outgoing line.
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) | 1985-08-09 | 1986-02-08 | 1986-08-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-08-09 | 1990-02-08 | 1990-08-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-08-09 | 1994-02-08 | 1994-08-10 | $7700.00 | Window Closed / Lapsed |