US4359718A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for switching two digital trains
Assignee: Societe Anonyme de Telecommunications SAT
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Filing: 1980-07-09
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Granted: 1982-11-16
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Expires: 2000-07-09
Abstract
Abstract A switching device for transmitting one only of two incoming digital trains in response to a switching demand signal, the digital trains containing identical data signals and clock signals at the same frequency, comprising a switching circuit for the data signals and a switching circuit for the clock signals, and a circuit for controlling the switching circuits which delivers a signal whose changes of state occur, after a change of state of the switching demand signal, only from the moment when the two clock signals are in the same logic state.
Inventors
- 👤 Georges A. Payen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 09:13
CPC Classifications
H; H04; H04L; H04L1/00; H04L1/02
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
91 words
A switching device for transmitting one only of two incoming digital trains in response to a switching demand signal, the digital trains containing identical data signals and clock signals at the same frequency, comprising a switching circuit for the data signals and a switching circuit for the clock signals, and a circuit for controlling the switching circuits which delivers a signal whose changes of state occur, after a change of state of the switching demand signal, only from the moment when the two clock signals are in the same logic state.
Claim 2
Dependent Claim
91 words
A switching device for transmitting one only of two incoming digital trains in response to a switching demand signal, the digital trains containing identical data signals and clock signals at the same frequency, comprising a switching circuit for the data signals and a switching circuit for the clock signals, and a circuit for controlling the switching circuits which delivers a signal whose changes of state occur, after a change of state of the switching demand signal, only from the moment when the two clock signals are in the same logic state.
Claim 3
Dependent Claim
52 words
The device of claim 1, wherein the control circuit comprises a NOR gate receiving the two clock signals and of which the output is connected to the clock input of a flip flop whose input receives the switching demand signal, the control signal being available at the output of the flip flop.
Claim 4
Dependent Claim
36 words
The device of claim 1, wherein a band pass filter whose central frequency is equal to the nominal frequency of the clock signals is connected to the output of the switching circuit of the clock signals.
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) | 1985-11-15 | 1986-05-17 | 1986-11-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-11-15 | 1990-05-17 | 1990-11-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-11-15 | 1994-05-17 | 1994-11-16 | $7700.00 | Window Closed / Lapsed |