Double redundant processor
First Claim
1. In a data processing system, a double redundant processor comprising:
- first and second master processors for processing data, control and address signals of said system where said first master processor is in an active state for processing said signals and said second master processor is in a stand-by state for processing said signals, said first and second master processors each including;
first and second subprocessors having a common memory for simultaneously processing said signals, said first subprocessor having means for transmitting to and receiving from said system said data, control and address signals of said system and said second subprocessor having means for receiving said data, control and address signals of said system,comparator means connected to continuously compare all of the processed signals from said first and second subprocessors for generating a comparison error signal when a comparison error occurs in the active master processor, andalarm monitor means responsive to said error signal for inactivating the active master processor and activating the stand-by master processor when said error signal occurs.
0 Assignments
0 Petitions
Accused Products
Abstract
A double redundant processor including first and second master processors for processing data, control and address signals in a data processing system. The first master processor is in an active state for processing the signals and the second master processor is in a standby state for processing the signals. The first and second master processors include first and second subprocessors for simultaneously processing the data, control and address signals, a comparator connected to compare the signals from the first and second subprocessors, thereby generating a comparison error signal if a disagreement exists, and an alarm monitor responsive to the error signal for inactivating the active master processor and activating the standby master processor.
188 Citations
16 Claims
-
1. In a data processing system, a double redundant processor comprising:
first and second master processors for processing data, control and address signals of said system where said first master processor is in an active state for processing said signals and said second master processor is in a stand-by state for processing said signals, said first and second master processors each including; first and second subprocessors having a common memory for simultaneously processing said signals, said first subprocessor having means for transmitting to and receiving from said system said data, control and address signals of said system and said second subprocessor having means for receiving said data, control and address signals of said system, comparator means connected to continuously compare all of the processed signals from said first and second subprocessors for generating a comparison error signal when a comparison error occurs in the active master processor, and alarm monitor means responsive to said error signal for inactivating the active master processor and activating the stand-by master processor when said error signal occurs. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
-
13. A double redundant processor for controlling the operation of an integrated message accounting system, said processor comprising:
-
master clock means responsive to an active signal for activating said system, first and second master processors for processing data, control and address signals of said accounting system where said first master processor is in an active state for processing said signals and said second master processor is in a stand-by state for processing said signals, said first and second master processors each including; first and second subprocessors having a common memory for simultaneously processing said signals, said first subprocessor having means for transmitting to and receiving from said system said data, control and address signals of said system and said second subprocessor having means for receiving said data, control and address signals of said system, comparator means connected to continuously compare all of the processed signals from said first and second subprocessors for generating a comparison error signal when a comparison error occurs in the active master processor, means for generating said active signal, and alarm monitor means responsive to said error signal for inactivating the active master processor and activating the stand-by master processor when said error signal occurs.
-
-
14. In an integrated message accounting system, a double redundant processor for controlling the operation of the system comprising:
-
first and second master processors for processing data, control and address signals of said accounting system where said first master processor is in an on-line state for actively processing said signals and said second master processor is in an off-line stand-by state for processing said signals, said first and second master processors each including; first and second subprocessors having a common memory for simultaneously processing said signals, said first subprocessor having means for transmitting and receiving said data, control and address signals of said system and said second subprocessor having means for receiving said data, control and address signals of said system and comparator means connected to continuously compare said processed signals from said first and second subprocessors for generating a comparison error signal when a comparison error occurs in the active master processor, first and second master clocks responsive to an active signal for activating said system, a first alarm monitor including means for generating a first active signal thereby activating said first master clock and means for generating a first on-line signal when said first master processor is active and on-line, said first alarm monitor including means responsive to a first error signal from said first master processor for generating a first alarm signal and means responsive to said first alarm signal for changing said first on-line signal to a first off-line signal, a second alarm monitor including means for generating a second active signal thereby activating said second master clock and means for generating a second on-line signal, said second alarm monitor including means responsive to a second error signal from said second master processor for generating a second alarm signal, said second alarm monitor connected to receive said first on-line signal and responsive thereto for preventing said second master processor from actively processing said signals, said second alarm monitor including means responsive to said first on-line signal for generating said second active signal when said first on-line signal changes to said off-line signal, thereby activating said second master clock and said second master processor, said first alarm monitor connected to receive said second on-line signal and responsive thereto for preventing said first master processor from actively processing said signals.
-
-
15. In a digital telephone system having a double redundant processor including first and second master processors for processing information signals where said first master processor is in an active state for processing said signals and the second master processor is in a stand-by state for processing said signals, said first and second master processors each including first and second subprocessors having a common memory for simultaneously processing said signals, said first subprocessors having means for transmitting to and receiving from said system said information signals of said system and said second subprocessors having means for receiving said information signals of said system, the method of checking the operation of said master processors comprising the steps of:
-
continuously comparing all of the processed signals of said first and second subprocessors, generating a comparison error signal when a comparison error occurs in the active master processor, and inactivating the first master processor and activating the second master processor in response to an occurrence of said error signal from the first master processor.
-
-
16. In a digital telephone system, a double redundant processor comprising:
-
first and second master processors for simultaneously processing information signals of said system where said first master processor is in an active state for processing said signals and said second master processor is in a stand-by state for processing said signals, said first and second master processors each including; first and second subprocessors having a common memory for simultaneously processing said signals, said first subprocessors having means for transmitting to and receiving from said system said data, control and address signals of said system and said second subprocessor having means for receiving said data, control and address signals of said system, comparator means connected to continuously compare all of the processed signals from said first and second subprocessors for generating a comparison error signal when a comparison error occurs in the first active master processor, and alarm monitor means responsive to said error signal for inactivating the first master processor and activating the second master processor when said error signal occurs.
-
Specification