US3763318A
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Time division multiplexer-demultiplexer for digital transmission at gigahertz rates
Assignee: Unisys Corp
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Filing: 1971-12-22
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Granted: 1973-10-02
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Expires: 1991-12-22
Abstract
Abstract The invention is a time division multiplexing-demultiplexing system for converting the parallel digits of a data word into serial format, transmitting the serial digits on a transmission line and reconstituting the parallel data word from the serially transmitted digits thereof. The multiplexing portion of the system comprises a sequence of coincidence gates adapted to receive the parallel digits, respectively, of the data word to be transmitted. The gates are coupled to equally spaced points along a transmission line such that a coincidence pulse traveling along the line sequentially causes the gates to provide output pulses in accordance with the values of the digits applied thereto respectively. The outputs of the gates are applied to equally spaced points along another transmission line. The demultiplexing portion of the system comprises another sequence of coincidence gates each having two inputs connected to the other ends of the two transmission lines, respectively, the inputs of the respective gates being connected at equally spaced points along the two lines. Each demultiplexing gate has an output that provides a pulse upon time coincidence of pulses at its inputs. The coincidence pulse traveling along the one transmission line sequentially triggers the multiplexing gates to provide a serial digit stream on the other transmission line corresponding to the digits of the word to be transmitted. The coincidence pulse traveling in one direction along the one transmission line sequentially triggers the demultiplexing gate in time coincidence with the serial digit stream traveling in the opposite direction along the other transmission line to provide the digits, in parallel, at the outputs of the demultiplexing gates, respectively.
Inventors
- 👤 G Ross
- 👤 L Susman
- 👤 E Eves
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 14:37
CPC Classifications
H; H04; H04L; H04L5/00; H04L5/22; H04L5/24; H04L5/245
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
349 words
A time division multiplexing-demultiplexing system for transmitting parallel digital data words comprising a plurality of first gating means each having first and second inputs and an output for providing a pulse at said output upon time coincidence of a pulse at said first input and a signal representative of a predetermined value of a digit of said data words at said second input, a serially connected sequence of first delay means coupling said first inputs of adjacent first gating means to each other, respectively, said second inputs of said first gating means being adapted to receive the digits of said data words, respectively, a serially connected sequence of second delay means coupling said outputs of adjacent first gating means to each other, respectively, a plurality of second gating means each having third and fourth inputs and an output for providing a pulse at said output thereof upon time coincidence of pulses at said third and fourth inputs, respectively, a serially connected sequence of third delay means coupling said third inputs of adjacent second gating means to each other, respectively, a serially connected sequence of fourth delay means coupling said fourth inputs of adjacent second gating means to each other, respectively, a source of coincidence pulses coupled to one end of said sequence of first delay means for applying coincidence pulses thereto in time coincidence with said data words, respectively, first transmission line means coupling the other end of said sequence of first delay means to said sequence of third delay means, and second transmission line means coupling said sequence of second delay means to said sequence of fourth delay means, said coincidence pulses sequentially traveling along said sequence of first delay means, said first tranSmission line means and said sequence of third delay means, whereby pulses representative of said digits of said data words applied respectively to said first inputs are serially applied via said second transmission line means to said sequence of fourth delay means wherein time coincidence with said coincidence pulses provides said digits of said data words at said outputs of said second gating means, respectively.
Claim 2
Dependent Claim
349 words
A time division multiplexing-demultiplexing system for transmitting parallel digital data words comprising a plurality of first gating means each having first and second inputs and an output for providing a pulse at said output upon time coincidence of a pulse at said first input and a signal representative of a predetermined value of a digit of said data words at said second input, a serially connected sequence of first delay means coupling said first inputs of adjacent first gating means to each other, respectively, said second inputs of said first gating means being adapted to receive the digits of said data words, respectively, a serially connected sequence of second delay means coupling said outputs of adjacent first gating means to each other, respectively, a plurality of second gating means each having third and fourth inputs and an output for providing a pulse at said output thereof upon time coincidence of pulses at said third and fourth inputs, respectively, a serially connected sequence of third delay means coupling said third inputs of adjacent second gating means to each other, respectively, a serially connected sequence of fourth delay means coupling said fourth inputs of adjacent second gating means to each other, respectively, a source of coincidence pulses coupled to one end of said sequence of first delay means for applying coincidence pulses thereto in time coincidence with said data words, respectively, first transmission line means coupling the other end of said sequence of first delay means to said sequence of third delay means, and second transmission line means coupling said sequence of second delay means to said sequence of fourth delay means, said coincidence pulses sequentially traveling along said sequence of first delay means, said first tranSmission line means and said sequence of third delay means, whereby pulses representative of said digits of said data words applied respectively to said first inputs are serially applied via said second transmission line means to said sequence of fourth delay means wherein time coincidence with said coincidence pulses provides said digits of said data words at said outputs of said second gating means, respectively.
Claim 3
Dependent Claim
25 words
The system of claim 1 in which each said first and third delay means comprises a length of transmission line having a predetermined propagation delay.
Claim 4
Dependent Claim
30 words
The system of claim 2 in which each said second and fourth delay means comprises a length of transmission line having a propagation delay different from said predetermined propagation delay.
Claim 5
Dependent Claim
20 words
The system of claim 1 further including means for terminating said sequence of third delay means in a non-reflective termination.
Claim 6
Dependent Claim
22 words
The system of claim 1 further including means for terminating said sequences of second and fourth delay means in non-reflective terminations, respectively.
Claim 7
Dependent Claim
19 words
The system of claim 1 in which each said first and second gating means comprises an avalanche transistor gate.
Claim 8
Dependent Claim
90 words
The system of claim 1 in which said sequences of first and third delay means are coupled to each other via said first transmission line means and said sequences of second and fourth delay means are coupled to each other via said second transmission line means in such a manner that said coincidence pulses traveling through said sequences of first and third delay means travel in a direction opposite to said pulses representative of said digits of said data words traveling through said sequences of second and fourth delay means.
Claim 9
Dependent Claim
353 words
A time division multiplexing-demultiplexing system having a multiplexing portion and a demultiplexing portion for transmitting parallel digital data words therebetween comprising a plurality of first gating means each having first and second inputs and an output for providing a pulse at said output upon time coincidence of a pulse at said first input and a signal representative of a predetermined value of a digit of said data words at said second input, a serially connected sequence of first delay means coupling said first inputs of adjacent first gating means to each other, respectively, said second inputs of said first gating means being adapted to receive the digits of said data words, respectively, a serially connected sequence of second delay means coupling said outputs of adjacent first gating means to each other, respectively, a source of coincidence pulses coupled to one end of said sequence of first delay means for applying coincidence pulses thereto in time coincidence with said data words, respectively, a plurality of second gating means each having third and fourth inputs and an outut for providing a pulse at said output thereof upon time coincidence of pulses at said third and fourth inputs, respectively, a serially connected sequence of third delay means coupling said third inputs of adjacent second gating means to each other, respectively, a serially connected sequence of fourth delay means coupling said fourth inputs of adjacent second gating means to each other, respectively, and transmission means coupling said multiplexing portion with said demultiplexing portion for transmitting said coincidence pulses to said sequence of third delay means and for coupling said sequence of second delay means to said sequence of fourth delay means, said coincidence pulses traveling along said sequence of first delay means and via said transmission means to said sequence of third delay means, whereby pulses representative of said digits of said data words applied respectively to said first inputs are serially applied via said transmission means to said sequence of fourth delay means wherein time coincidence with said coincidence pulses provides said digits of said data words at said outputs of said secoNd gating means, respectively.
Claim 10
Dependent Claim
353 words
A time division multiplexing-demultiplexing system having a multiplexing portion and a demultiplexing portion for transmitting parallel digital data words therebetween comprising a plurality of first gating means each having first and second inputs and an output for providing a pulse at said output upon time coincidence of a pulse at said first input and a signal representative of a predetermined value of a digit of said data words at said second input, a serially connected sequence of first delay means coupling said first inputs of adjacent first gating means to each other, respectively, said second inputs of said first gating means being adapted to receive the digits of said data words, respectively, a serially connected sequence of second delay means coupling said outputs of adjacent first gating means to each other, respectively, a source of coincidence pulses coupled to one end of said sequence of first delay means for applying coincidence pulses thereto in time coincidence with said data words, respectively, a plurality of second gating means each having third and fourth inputs and an outut for providing a pulse at said output thereof upon time coincidence of pulses at said third and fourth inputs, respectively, a serially connected sequence of third delay means coupling said third inputs of adjacent second gating means to each other, respectively, a serially connected sequence of fourth delay means coupling said fourth inputs of adjacent second gating means to each other, respectively, and transmission means coupling said multiplexing portion with said demultiplexing portion for transmitting said coincidence pulses to said sequence of third delay means and for coupling said sequence of second delay means to said sequence of fourth delay means, said coincidence pulses traveling along said sequence of first delay means and via said transmission means to said sequence of third delay means, whereby pulses representative of said digits of said data words applied respectively to said first inputs are serially applied via said transmission means to said sequence of fourth delay means wherein time coincidence with said coincidence pulses provides said digits of said data words at said outputs of said secoNd gating means, respectively.
Claim 11
Dependent Claim
16 words
The system of claim 8 in which said transmission means includes at least one transmission 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) | 1976-10-01 | 1977-04-02 | 1977-10-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-01 | 1981-04-02 | 1981-10-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-01 | 1985-04-02 | 1985-10-02 | $7700.00 | Window Closed / Lapsed |