Patent US4554169A successfully refreshed from Google Patents.
Patent US3898386A successfully refreshed from Google Patents.
US3898386A
Expired / Lapsed
US
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Error detection and protection circuits for duplicated peripheral units
Assignee: AG Communication Systems Corp
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Filing: 1974-01-18
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Granted: 1975-08-05
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Expires: 1994-01-18
Abstract
Abstract An addressable ticketing scanner apparatus for use in a communication switching system includes duplicated scanner units, one normally operable in an active mode and the other in a standby mode, for selectively interrogating scan points arranged in a common matrix. Error detection apparatus associated with matrix access circuits of the duplicated scanner units, including a plurality of current sources and a plurality of current sinks, are operable to provide an error indication whenever more than one current source or current sink is enabled during a given scan operation. Power switch circuits are responsive to a command provided by the common control to deenergize the matrix access circuits of the standby scanner unit.
Inventors
- 👤 David E Gaon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 10:18
CPC Classifications
H; H04; H04Q; H04Q3/00; H04Q3/42; H04Q3/54; H04Q3/545; H04Q3/54541; H04Q3/54558
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
315 words
In a communication switching system including a switching network and common control means for establishing paths through the switching network, said network including status means for indicating a busy condition for a given path through the network, means responsive to calls for service from calling lines to obtain the addresses of said lines, and memory means for storing addresses of lines requesting service, a ticketing arrangement comprising: a matrix having a plurality of monitoring devices arranged in a matrix array between rows and columns of said matrix, and ticketing scanner means including first and second scanner units for commonly effecting access of said matrix, each of said scanner units including matrix access means having a first group of driver means connected to the rows of said matrix and a second group of driver means connected to the columns of said matrix, said driver means of said first and second groups being operable when energized to be enabled in pairs to interrogate the status of at least a given one of said monitoring devices, switch means operable when enabled to energize said driver means, and control means for generating a plurality of control signals for each of said scanner units, the control means of one of said scanner units being responsive to a command provided by said common control means to disable the corresponding switch means to effect deenergization of the corresponding driver means, the control means of the other one of said scanner units being responsive to a command provided by said common control means to enable the corresponding switch means to effect energization of the corresponding driver means to permit selective enabling of driver means of the corresponding first and second groups in response to data supplied by said common control means, and each said scanner unit including error detection means for providing an error indication at least whenever unselected driver means are enabled.
Claim 2
Dependent Claim
315 words
In a communication switching system including a switching network and common control means for establishing paths through the switching network, said network including status means for indicating a busy condition for a given path through the network, means responsive to calls for service from calling lines to obtain the addresses of said lines, and memory means for storing addresses of lines requesting service, a ticketing arrangement comprising: a matrix having a plurality of monitoring devices arranged in a matrix array between rows and columns of said matrix, and ticketing scanner means including first and second scanner units for commonly effecting access of said matrix, each of said scanner units including matrix access means having a first group of driver means connected to the rows of said matrix and a second group of driver means connected to the columns of said matrix, said driver means of said first and second groups being operable when energized to be enabled in pairs to interrogate the status of at least a given one of said monitoring devices, switch means operable when enabled to energize said driver means, and control means for generating a plurality of control signals for each of said scanner units, the control means of one of said scanner units being responsive to a command provided by said common control means to disable the corresponding switch means to effect deenergization of the corresponding driver means, the control means of the other one of said scanner units being responsive to a command provided by said common control means to enable the corresponding switch means to effect energization of the corresponding driver means to permit selective enabling of driver means of the corresponding first and second groups in response to data supplied by said common control means, and each said scanner unit including error detection means for providing an error indication at least whenever unselected driver means are enabled.
Claim 3
Dependent Claim
205 words
In a communication switching system including a switching network and common control means for establishing paths through the switching network, said network including status means for indicating a busy condition for a given path through the network, means responsive to calls for service from calling lines to obtain the addresses of said lines, and memory means for storing addresses of links requesting service, a ticketing arrangement comprising: a matrix having a plurality of monitoring devices arranged in a matrix array between rows and columns of the matrix, a scanner unit including matrix access means having a first group of driver means connected to rows of the matrix and a second group of driver means connected to columns of the matrix, switch means operable when enabled to energize said driver means of said first and second groups, and control means operable to generate control signals including a first control signal for enabling said switch means and a plurality of futher control signals for enabling said driver means of said first and second groups, predetermined ones of said driver means being operable when enabled to be responsive to address data supplied by said common control means to effect interrogation of at least one of said monitoring devices.
Claim 4
Dependent Claim
205 words
In a communication switching system including a switching network and common control means for establishing paths through the switching network, said network including status means for indicating a busy condition for a given path through the network, means responsive to calls for service from calling lines to obtain the addresses of said lines, and memory means for storing addresses of links requesting service, a ticketing arrangement comprising: a matrix having a plurality of monitoring devices arranged in a matrix array between rows and columns of the matrix, a scanner unit including matrix access means having a first group of driver means connected to rows of the matrix and a second group of driver means connected to columns of the matrix, switch means operable when enabled to energize said driver means of said first and second groups, and control means operable to generate control signals including a first control signal for enabling said switch means and a plurality of futher control signals for enabling said driver means of said first and second groups, predetermined ones of said driver means being operable when enabled to be responsive to address data supplied by said common control means to effect interrogation of at least one of said monitoring devices.
Claim 5
Dependent Claim
30 words
A ticketing arrangement as set forth in claim 2 wherein said control means is responsive to a command provided by said common control means to generate said first control signal.
Claim 6
Dependent Claim
31 words
A ticketing arrangement as set forth in claim 3 wherein said control means is responsive to a further command provided by said common control means to provide said further control signals.
Claim 7
Dependent Claim
55 words
A ticketing arrangement as set forth in claim 3 wherein said switch means comprises a plurality of first switching devices interposed between a first potential source and said driver means of said first group and a plurality of second switching devices interposed between a second potential source and the driver means of said second gRoup.
Claim 8
Dependent Claim
38 words
A ticketing arrangement as set forth in claim 5 wherein said first and second switching devices comprise a relay having normally a pair of contacts connected between one of said potential sources and one of said driver means.
Claim 9
Dependent Claim
224 words
In a communication switching system including a switching network and common control means for establishing paths through the switching network, said network including status means for indicating a busy condition for a given path through the network, means responsive to calls for service from calling lines to obtain the addresses of said lines, and memory means for storing addresses of lines requesting service, a ticketing arrangement comprising: a matrix having a plurality of monitoring devices arranged in a matrix array between rows and columns of the matrix, a scanner unit including matrix access means having row access means including first and second groups of driver means connected to rows of the matrix and column access means having third and fourth groups of driver means connected to columns of the matrix, control means responsive to a command and data provided by said common control means to enable a driver means of said first and second groups and a driver means of said third and fourth groups to effect interrogation of at least a preselected one of said monitoring devices, and error detecting means including first, second, third and fourth error detection circuits, each individually associated with a different one of said groups of driver means, for providing an error indication at least whenever more than one driver means of a given group is enabled concurrently.
Claim 10
Dependent Claim
224 words
In a communication switching system including a switching network and common control means for establishing paths through the switching network, said network including status means for indicating a busy condition for a given path through the network, means responsive to calls for service from calling lines to obtain the addresses of said lines, and memory means for storing addresses of lines requesting service, a ticketing arrangement comprising: a matrix having a plurality of monitoring devices arranged in a matrix array between rows and columns of the matrix, a scanner unit including matrix access means having row access means including first and second groups of driver means connected to rows of the matrix and column access means having third and fourth groups of driver means connected to columns of the matrix, control means responsive to a command and data provided by said common control means to enable a driver means of said first and second groups and a driver means of said third and fourth groups to effect interrogation of at least a preselected one of said monitoring devices, and error detecting means including first, second, third and fourth error detection circuits, each individually associated with a different one of said groups of driver means, for providing an error indication at least whenever more than one driver means of a given group is enabled concurrently.
Claim 11
Dependent Claim
54 words
A ticketing arrangement as set forth in claim 7 wherein said control means is operable to enable driver means of said first, second, third and fourth groups in a predetermined sequence, and said control means provides first and second signals for determining the status of said error detection circuits at first and second times.
Claim 12
Dependent Claim
81 words
A ticketing arrangement as set forth in claim 8 wherein said control means is operable to provide a first enabling signal for one of said groups of driver means and a second enabling signal for a further group of said driver means, said first enabling signal being extended to the error detection circuit associated with said first group of driver means and said second enabling signal being extended to the error detection circuit associated with said one group of driver means.
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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) | 1978-08-04 | 1979-02-03 | 1979-08-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-08-04 | 1983-02-03 | 1983-08-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-08-04 | 1987-02-03 | 1987-08-05 | $7700.00 | Window Closed / Lapsed |