Patent US3770948A successfully refreshed from Google Patents.
US3770948A
Expired / Lapsed
US
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Data handling system maintenance arrangement
Assignee: AG Communication Systems Corp
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Filing: 1972-05-26
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Granted: 1973-11-06
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Expires: 1992-05-26
Abstract
Abstract A switching system having a duplicated pair of data handlers which generate duplicated pairs of handling or processing signals for reliability purposes, includes a comparator for determining a mismatch between the signals of any one or more of the pairs of signals to indicate a maintenance problem in the system, a pair of data selectors for supplying one at a time sets of the pairs of signals to be compared to the comparator, and a selection controller for enabling selectively the pair of data selectors, whereby greater flexibility of operation and cost reduction are achieved.
Inventors
- 👤 J Caputo
- 👤 R Chybowski
- 👤 P Harrington
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 18:37
CPC Classifications
G; G06; G06F; G06F11/00; G06F11/07; G06F11/16; G06F11/1629; G06F11/1641
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
170 words
A maintenance arrangement for use with a switching system having maintenance apparatus and a duplicated pair of data handlers operating in synchronism in response to a common source rf recurring clock pulses and each handler including a plurality of subsystems for generating a group of duplicated pairs of handling signals, said groups of signals comprising N number of sets of said pairs of signals, said arrangement comprising: comparing means for generating a mismatch signal for use by the maintenance apparatus in response to a disagreement between the signals of any one of the pairs of signals; a pair of first and second data selecting means responsive to the group of duplicated pairs of the handling signals for supplying sets of said signals to be compared one at a time to said comparing means; and first and second control means responsive to said source for enabling selectively said pair of first and second data selecting means respectively to supply said N number of sets of said signals to said comparing means.
Claim 2
Dependent Claim
170 words
A maintenance arrangement for use with a switching system having maintenance apparatus and a duplicated pair of data handlers operating in synchronism in response to a common source rf recurring clock pulses and each handler including a plurality of subsystems for generating a group of duplicated pairs of handling signals, said groups of signals comprising N number of sets of said pairs of signals, said arrangement comprising: comparing means for generating a mismatch signal for use by the maintenance apparatus in response to a disagreement between the signals of any one of the pairs of signals; a pair of first and second data selecting means responsive to the group of duplicated pairs of the handling signals for supplying sets of said signals to be compared one at a time to said comparing means; and first and second control means responsive to said source for enabling selectively said pair of first and second data selecting means respectively to supply said N number of sets of said signals to said comparing means.
Claim 3
Dependent Claim
64 words
An arrangement according to claim 1, wherein each one of said data selecting means includes N number of sets of coincidence logic gates responsive to said signals, each one of said control means generating N number of select signals individually associated with each one of said sets of gates of its selecting means for enabling selectively on a one-at-a-time basis said sets of gates.
Claim 4
Dependent Claim
27 words
An arrangement according to claim 2, wherein each one of said control means includes a distributor for generating recurring timing signals to serve as said select signals.
Claim 5
Dependent Claim
24 words
An arrangement according to claim 3, wherein said N number of sets of logic gates are energized sequentially in response to said timing signals.
Claim 6
Dependent Claim
41 words
An arrangement according to claim 4, further including first and second timing generators for controlling the operation of the pair of data handlers and for controlling said distributors, the source of recurrring clock pulses for driving said timing generators in synchronism.
Claim 7
Dependent Claim
46 words
An arrangement according to claim 1, wherein said first and second control means includes respective first and second distributors individually associated with one of the pair of data handlers for producing recurring timing signals to serve as select signals for said pair of data selecting means.
Claim 8
Dependent Claim
41 words
An arrangement according to claim 6, further including first and second timing generators for controlling the operation of the pair of data handlers and for controlling said distributors, the source of recurring clock pulses for driving said timing generators in synchronism.
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) | 1976-11-05 | 1977-05-07 | 1977-11-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-05 | 1981-05-07 | 1981-11-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-05 | 1985-05-07 | 1985-11-06 | $7700.00 | Window Closed / Lapsed |