US3602900A
Expired / Lapsed
US
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Synchronizing system for data processing equipment clocks
Assignee: International Standard Electric Corp
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Filing: 1969-10-03
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Granted: 1971-08-31
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Expires: 1989-10-03
Abstract
Abstract In the duplicated data-processing systems, the clock of the ''''reserve'''' unit must normally be synchronized with the one of the ''''inline'''' unit, as long as this latter operates normally. According to the present invention, the clock of the ''''inline'''' unit originates a synchronizing signal periodically, and the clock of the ''''reserve'''' unit delimits a synchronization ''''window.'''' If the synchronizing signal falls into the synchronization window, the setting into synchronism of the ''''reserve'''' unit is made. If not, an alarm signal is given. In this arrangement, if the clock of the ''''inline'''' unit operates at an abnormal rhythm because of a failure, the clock of the reserve unit will not be synchronized to this abnormal rhythm.
Inventors
- 👤 Serge Delaigue
- 👤 Roger A Pain
- 👤 Pierre H Cogne
- 👤 Louis H Rieux
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 04:22
CPC Classifications
G; G06; G06F; G06F11/00; G06F11/07; G06F11/16; G06F11/1675; G06F11/1679; G06F1/00; G06F1/04; G06F1/14; G06F13/00; G06F13/38; G06F13/42; G06F13/4204; G06F13/4221; G06F13/423; G06F11/20; G06F11/2097
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
127 words
A synchronization system method for clocks of data processing units comprising the steps of: periodically producing a synchronization impulse from a first clock; delimiting, from a second clock, a time interval synchronization window for framing the synchronization impulse that this second clock may produce; and setting into synchronism said second clock each time that a synchronization impulse produced by the first clock comes within the limits of the synchronization window of the second clock, so as to set the second clock into a position identical to the one of the first clock, whereby, the second clock is not synchronized with the first clock when the synchronization impulse from the first clock falls outside the synchronization window and the second clock continues to operate at its own rhythm.
Claim 2
Dependent Claim
127 words
A synchronization system method for clocks of data processing units comprising the steps of: periodically producing a synchronization impulse from a first clock; delimiting, from a second clock, a time interval synchronization window for framing the synchronization impulse that this second clock may produce; and setting into synchronism said second clock each time that a synchronization impulse produced by the first clock comes within the limits of the synchronization window of the second clock, so as to set the second clock into a position identical to the one of the first clock, whereby, the second clock is not synchronized with the first clock when the synchronization impulse from the first clock falls outside the synchronization window and the second clock continues to operate at its own rhythm.
Claim 3
Dependent Claim
30 words
The method According to claim 1 including the step of generating the synchronizing impulse from a position of the first clock which forces the second clock into its initial position.
Claim 4
Dependent Claim
51 words
The method according to claim 2 including the step of jumping a certain number of positions by said second clock to enable it, in the case where both clocks operate at the same rhythm but are time-spaced the one with respect to the other, to catch up the first clock progressively.
Claim 5
Dependent Claim
47 words
The method according to claim 3 including the step of limiting the number of positions jumped by the second clock to less than the number of positions corresponding to the synchronizing window so that, upon approaching of synchronism, the synchronization impulse does not jump the synchronization area.
Claim 6
Dependent Claim
98 words
The method of claim 4 including the steps of time-spacing during synchronism, the clock of the reserve unit with respect to the clock of the in-line unit, so that the synchronization window of the reserve unit clock is centered upon the synchronization impulse that the clock would generate with a time-shift of same value, but in a reverse direction; and time-shifting at the same time, the clock of the reserve unit with respect to the clock of the in-line unit, to permit time-spacing differences in the progression of the clocks of a same value for advancing and delaying.
Claim 7
Dependent Claim
135 words
A synchronization system for clocks of data processing units comprising: means for periodically producing a synchronization impulse from a first clock; means for delimiting, from a second clock, a time interval synchronization window for framing the synchronization impulse that this second clock may produce; and means for the setting into synchronism said second clock which is controlled by a synchronization impulse produced by the first clock when its impulse comes within the limits of the synchronization window of the second clock, so as to set the second clock into a position identical to the one of the first clock, whereby the second clock is synchronized with the first one when the rhythm of both clocks are similar such that the synchronization impulse from the first clock falls inside the synchronization window of the second clock.
Claim 8
Dependent Claim
135 words
A synchronization system for clocks of data processing units comprising: means for periodically producing a synchronization impulse from a first clock; means for delimiting, from a second clock, a time interval synchronization window for framing the synchronization impulse that this second clock may produce; and means for the setting into synchronism said second clock which is controlled by a synchronization impulse produced by the first clock when its impulse comes within the limits of the synchronization window of the second clock, so as to set the second clock into a position identical to the one of the first clock, whereby the second clock is synchronized with the first one when the rhythm of both clocks are similar such that the synchronization impulse from the first clock falls inside the synchronization window of the second clock.
Claim 9
Dependent Claim
44 words
The system according to claim 6 including means for generating the synchronizing impulse from a position of the first clock, such that in order to set the second clock into synchronism with the first clock, the second clock is forced into its initial position.
Claim 10
Dependent Claim
68 words
The system of claim 7 including means to cause the second clock to jump a certain number of positions and go though a more reduced number of positions than the first clock; and means to progressively cause the second clock to catch up to the first clock in the case where both clocks operate at the same rhythm but are time-spaced the one with respect to the other.
Claim 11
Dependent Claim
41 words
The system of claim 8 wherein the number of positions jumped by the second clock is less than the number of positions corresponding to the synchronizing window so that, at approaching synchronization, the synchronization impulse does not jump the synchronization window.
Claim 12
Dependent Claim
96 words
The arrangement of claim 9 including synchronism means for the clock of the reserve unit to be time-spaced with respect to the clock of the in-line unit, so that the synchronization window of the reserve unit clock is centered upon the synchronization impulse that the clock would generate with a time-shift of same value, but in reverse direction; and means to systematically time-shift the clock of the reserve unit with respect to the clock of the in-line unit to permit time-spacing differences in the progression of the clocks of a same value for advancing and delaying.
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) | 1974-08-30 | 1975-03-01 | 1975-08-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-08-30 | 1979-03-01 | 1979-08-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-08-30 | 1983-03-01 | 1983-08-31 | $7700.00 | Window Closed / Lapsed |