US4038601A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for connecting peripheral units to a line for transmitting data by pulse code modulation
Assignee: Airbus Group SAS
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Filing: 1975-01-29
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Granted: 1977-07-26
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Expires: 1995-01-29
Abstract
Abstract The invention relates to a device for connecting peripheral units to a line for transmitting data by pulse code modulation. The transmitter/receiver of such unit is connected to the line through a three-winding insulating transformer having its windings connected to two distinct circuits for connection to the line, one of which is formed by high-value resistors and is assigned to reception and the other by a network of voltage-threshold diodes assigned to transmission.
Inventors
- 👤 Jean-Pierre Laborie
- 👤 Michel Pevrol
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 03:55
CPC Classifications
H; H04; H04M; H04M9/00; H04M9/02; H04M9/022; H04M9/025; H04L; H04L12/00; H04L12/28; H04L12/40
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
192 words
A device for connecting a peripheral transmitting-receiving unit having an emitter portion for transmitting and a receiving portion for receiving signals to and from a two-conductor transmission line, having a characteristic impedance, said device transmitting and receiving data modulated by coded pulses, comprising in combination: (a) a first linking circuit connecting said transmission line to said peripheral unit, for the transmission of signals therefrom to said transmission line, said first linking circuit including a low impedance circuit, to establish transmission from said peripheral unit, (b) a second linking circuit separate and independent from said first linking circuit connecting said transmission line to said peripheral unit for receiving signals from said transmission line, said second linking circuit including a high impedance circuit, (c) a third linking circuit connected with said first and said second linking circuits and with said peripheral transmitting receiving unit including a transformer electrically connected to the emitter and receiver portions of said peripheral unit, and (d) said first linking circuit including at least one group of semi-conducting diodes connected in series and electrically connecting one of the conductors of said two conductor transmission line with said third linking circuit.
Claim 2
Independent Claim
192 words
A device for connecting a peripheral transmitting-receiving unit having an emitter portion for transmitting and a receiving portion for receiving signals to and from a two-conductor transmission line, having a characteristic impedance, said device transmitting and receiving data modulated by coded pulses, comprising in combination: (a) a first linking circuit connecting said transmission line to said peripheral unit, for the transmission of signals therefrom to said transmission line, said first linking circuit including a low impedance circuit, to establish transmission from said peripheral unit, (b) a second linking circuit separate and independent from said first linking circuit connecting said transmission line to said peripheral unit for receiving signals from said transmission line, said second linking circuit including a high impedance circuit, (c) a third linking circuit connected with said first and said second linking circuits and with said peripheral transmitting receiving unit including a transformer electrically connected to the emitter and receiver portions of said peripheral unit, and (d) said first linking circuit including at least one group of semi-conducting diodes connected in series and electrically connecting one of the conductors of said two conductor transmission line with said third linking circuit.
Claim 3
Dependent Claim
41 words
The device as claimed in claim 1, said first linking circuit further including a second group of semi-conducting diodes connected in series and electrically connecting the other of said conductors of said two conductor transmission line with said third linking circuit.
Claim 4
Dependent Claim
28 words
The device as claimed in claim 1, wherein each said groups of diodes consists of two diodes, said two diodes being connected in parallel with their polarities reversed.
Claim 5
Dependent Claim
25 words
The device as claimed in claim 1, wherein each said groups of diodes includes a plurality of diodes connected in two opposite directions in series.
Claim 6
Dependent Claim
92 words
The device as claimed in claim 1, wherein said third linking circuit includes a pluse transformer and said peripheral unit includes a single pair of access terminals connected to both said emitter portion and said receiving portion, said pulse transformer including a first pair of windings connected with said single pair of access terminals and a second pair of windings one of said windings of said second pair being connected with said first linking circuit and the other of said windings of said second pair being connected with said second linking circuit.
Claim 7
Dependent Claim
51 words
The device as claimed in claim 1, wherein said second linking circuit includes at least one resistor electrically connecting one of the conductors of said two conductor transmission line in series with said third linking circuit, said resistor having an impedance substantially higher than said characteristic impedance of said transmission line.
Claim 8
Dependent Claim
91 words
The device as claimed in claim 6, said second linking circuit further including a second resistor electrically connecting the other of the conductors of said two conductor transmission line with said third linking circuit, said second resistor being in series connection with said other conductor and said third linking circuit, said second linking circuit having an impedance substantially higher than said characteristic impedance perceived by said transmission line when said peripheral unit is short-circuited which impedance is equivalent to the sum of the impedances of said one and said second resistors.
References Cited (Backward Citations)
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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) | 1980-07-25 | 1981-01-24 | 1981-07-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-07-25 | 1985-01-24 | 1985-07-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-07-25 | 1989-01-24 | 1989-07-26 | $7700.00 | Window Closed / Lapsed |