US3668328A
Expired / Lapsed
US
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Time-divisional connection system for a plurality of digital communication circuits
Assignee: KADUSAI DENSHIN DENWA KK
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Filing: 1970-03-26
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Granted: 1972-06-06
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Expires: 1990-03-26
Abstract
Abstract A time-divisional connection system for a plurality of digital communication circuits for connecting time-divisionally, for each communication circuit in a characterwise manner, between one and the other of each pair of two-way digital communication circuits by means of four-wire terminal equipment. The system includes a detector for detecting time-divisionally, for each communication circuit, whether or not a time-serial character exists at one of the input and output terminals of the four-wire terminal equipment for each communication circuit, and means responsive to the output of the detector for interrupting one of two paths from the input terminals to the output terminals of each communication channel in the four-wire terminal equipment during the duration of the detected character or characters in order to prevent an undersired sending-out or receiving of the detected time-serial character signal.
Inventors
- 👤 Yukio Nakagome
- 👤 Hiroichi Teramura
- 👤 Yasuo Fukata
- 👤 Sumitoshi Ando
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 03:12
CPC Classifications
H; H04; H04L; H04L12/00; H04L12/50; H04L12/52
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
283 words
A time-divisional connection system for a plurality of twoway digital communication circuits, comprising: input circuit path means and output circuit path means for each said two-way communication circuit for selectively isolating said plurality of digital circuits; a plurality of input connection terminals respectively coupled to said input path means for receiving serial character signals from said two-way communication circuits; first conversion means coupled in series with said input circuit path means and said input terminals for time-divisionally converting, for each input terminal of said two-way digital communication circuits, serial-character signals to parallelcharacter signals; a plurality of output connection terminals respectively coupled to said output path means for sending out serial character signals to said two-way communication circuits; second conversion means coupled in series with said output circuit path means and said output terminals for timedivisionally converting, for each output terminal of said twoway digital communication circuit, parallel-character signals to serial-character signals; means operatively connected to the first and second conversion means for storing temporarily and time-divisionally the parallel-character signals from the first conversion means, and for transferring the stored parallel-character signals to the second conversion means at a desired time slot; detection means for detecting time-divisionally, for each of said two-way communication circuits, whether or not a timeserial character signal exists at one of the input and output terminals; and control means operatively connected to the first and second conversion means and the detection means for interrupting, time-divisionally, one of said input and output path means of any respective one of said two-way digital communication circuits when said detection means detects a digital signal in the other of said input and output path means of said one of said two-way digital communication circuits.
Claim 2
Dependent Claim
283 words
A time-divisional connection system for a plurality of twoway digital communication circuits, comprising: input circuit path means and output circuit path means for each said two-way communication circuit for selectively isolating said plurality of digital circuits; a plurality of input connection terminals respectively coupled to said input path means for receiving serial character signals from said two-way communication circuits; first conversion means coupled in series with said input circuit path means and said input terminals for time-divisionally converting, for each input terminal of said two-way digital communication circuits, serial-character signals to parallelcharacter signals; a plurality of output connection terminals respectively coupled to said output path means for sending out serial character signals to said two-way communication circuits; second conversion means coupled in series with said output circuit path means and said output terminals for timedivisionally converting, for each output terminal of said twoway digital communication circuit, parallel-character signals to serial-character signals; means operatively connected to the first and second conversion means for storing temporarily and time-divisionally the parallel-character signals from the first conversion means, and for transferring the stored parallel-character signals to the second conversion means at a desired time slot; detection means for detecting time-divisionally, for each of said two-way communication circuits, whether or not a timeserial character signal exists at one of the input and output terminals; and control means operatively connected to the first and second conversion means and the detection means for interrupting, time-divisionally, one of said input and output path means of any respective one of said two-way digital communication circuits when said detection means detects a digital signal in the other of said input and output path means of said one of said two-way digital communication circuits.
Claim 3
Dependent Claim
77 words
A time-divisional connection system according to claim 1, in which the detection means is operatively connected to the first conversion means to detect whether or not a time-serial character signal exists at the input terminal of each of said communication circuits, and in which the control means is operatively connected to the second conversion means to interrupt the parallel-serial signal conversion of the second conversion means during the duration of the character detected by the detection means.
Claim 4
Dependent Claim
77 words
A time-divisional connection system according to claim 1, in which the detection means is operatively connected to the second conversion means to detect whether or not a time-serial character signal exists at the output terminal of each of said communication circuits, and in which the control means is operatively connected to the first conversion means to interrupt the serial-parallel signal conversion of the first conversion means during the duration of the character detected by the detection means.
Claim 5
Dependent Claim
110 words
A tIme-divisional connection system according to claim 1, in which said input path means and output path means for each one of said digital communication circuits includes two-wire to four-wire conversion means, said system further comprising memory means for storing distinctive identifying binary information corresponding to each two-way digital communication circuit, addressing means for said memory means, and gate means connected between said detection means and control means to pass an output signal of the detection means corresponding to any one of said two-way digital communication circuits only in response to an addressing by said addressing means of said identifying binary information corresponding to said one two-way digital communication circuit.
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) | 1975-06-06 | 1975-12-06 | 1976-06-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-06 | 1979-12-06 | 1980-06-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-06 | 1983-12-06 | 1984-06-06 | $7700.00 | Window Closed / Lapsed |