US3609693A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Data communication system comprising at least one remote station and a plurality of terminal units
Assignee: Olivetti SpA
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Filing: 1969-01-22
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Granted: 1971-09-28
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Expires: 1989-01-22
Abstract
Abstract A communication system comprising a remote station connected to a plurality of terminal units which are located close to each other, all the units being connected to a line through a single modulation-demodulation unit whose interface towards the terminal units comprises a plurality of channels, each connected to the corresponding channels of all the terminal units, and including a pair of main channels for transmitting information signals from and to the modulation-demodulation unit, a plurality of channels for transmitting control signals from the terminal unit to the modulation-demodulation unit and a plurality of channels for transmitting signals replying to the control signals and other condition indicating signals from the modulation-demodulation unit to the terminal unit.
Inventors
- 👤 Luigino Ferroglio
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 15:43
CPC Classifications
H; H04; H04J; H04J1/00; H04J1/02; H04J1/10; H04L; H04L5/00
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
252 words
A data communication system comprising a remote station connected through a transmission line to a plurality of terminal units which are close to each other, and means connecting said terminal units to said transmission line through an interface unit including for each one of said terminal units a pair of main channels for the transmission of information signals to and from said connecting means, a control channel for transmitting control signals from the terminal unit to said connecting means and a reply channel for transmitting signals replying to said control signals from said connecting means to the terminal unit, in accordance with a predetermined conversation procedure wherein the improvement comprises: a single modulation-demodulation unit coupled to said plurality of terminal units, the channels corresponding to each of said terminal units being connected to a single input of said modulation-demodulation unit and there through to said transmission line, said remote station being adapted to transmit to said modulation-demodulation unit an address to identify a terminal unit of said plurality of terminal units to be selected, said modulation-demodulation unit including means for sending the received selecting address simultaneously to each of said terminal units through one of said pair of main channels, each one of said terminal units being adapted to recognize the selecting address and to establish said conversation procedure through the pair of main channels and control and reply channels coupled between said modulation-demodulation device and upon recognition by the selected terminal unit of the selecting address received by said modulation-demodulation unit.
Claim 2
Dependent Claim
252 words
A data communication system comprising a remote station connected through a transmission line to a plurality of terminal units which are close to each other, and means connecting said terminal units to said transmission line through an interface unit including for each one of said terminal units a pair of main channels for the transmission of information signals to and from said connecting means, a control channel for transmitting control signals from the terminal unit to said connecting means and a reply channel for transmitting signals replying to said control signals from said connecting means to the terminal unit, in accordance with a predetermined conversation procedure wherein the improvement comprises: a single modulation-demodulation unit coupled to said plurality of terminal units, the channels corresponding to each of said terminal units being connected to a single input of said modulation-demodulation unit and there through to said transmission line, said remote station being adapted to transmit to said modulation-demodulation unit an address to identify a terminal unit of said plurality of terminal units to be selected, said modulation-demodulation unit including means for sending the received selecting address simultaneously to each of said terminal units through one of said pair of main channels, each one of said terminal units being adapted to recognize the selecting address and to establish said conversation procedure through the pair of main channels and control and reply channels coupled between said modulation-demodulation device and upon recognition by the selected terminal unit of the selecting address received by said modulation-demodulation unit.
Claim 3
Dependent Claim
82 words
A system as claimed in claim 1, wherein said modulation-demodulation unit includes a modulation device connected to one of said main channels connected to each of said terminal units, a demodulation device connected to the other main channel of each of said terminal units, and inhibiting means connected to the control channel of each of said terminal units and responsive to a transmission request signal for inhibiting all of said plurality of terminal units from receiving message transmitted to said remote station.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-09-27 | 1975-03-29 | 1975-09-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-27 | 1979-03-29 | 1979-09-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-27 | 1983-03-29 | 1983-09-28 | $7700.00 | Window Closed / Lapsed |