New PDF release: A Generic Fault-Tolerant Architecture for Real-Time

By David Powell

ISBN-10: 1441948805

ISBN-13: 9781441948809

ISBN-10: 1475733534

ISBN-13: 9781475733532

The layout of computers to be embedded in severe real-time purposes is a fancy job. Such structures mustn't ever in simple terms warrantly to satisfy demanding real-time closing dates imposed by way of their actual setting, they need to warrantly to take action dependably, regardless of either actual faults (in undefined) and layout faults (in or software). A fault-tolerance strategy is crucial for those promises to be commensurate with the protection and reliability standards of many lifestyles- and mission-critical functions. This e-book explains the motivations and the result of a collaborative project', whose aim used to be to seriously lessen the lifecycle expenditures of such fault­ tolerant platforms. The end-user businesses engaging during this venture already set up fault-tolerant platforms in serious railway, area and nuclear-propulsion purposes. even though, those are proprietary platforms whose architectures were adapted to satisfy domain-specific specifications. This has ended in very high priced, rigid, and infrequently hardware-intensive suggestions that, by the point they're constructed, demonstrated and licensed to be used within the box, can already be out-of-date by way of their underlying and software program technology.

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Extra resources for A Generic Fault-Tolerant Architecture for Real-Time Dependable Systems

Sample text

While there are only two operational channels, the instance operates in a two-out-of-two mode. Introduction and Overview 24 Should a fault occur while in this mode, the instance is switched to a safe state if the errors caused by the fault are detected (either locally within a channel or by twoout-of-two comparison). A second railway instance was studied and actually implemented as a demonstrator. 3 (Chapter 10). 2 Nuclear Propulsion Instance The targeted nuclear propulsion application is a secondary protection system.

A safety-monitoring application executed by the secondary lane while the primary lane is operational. In view of the differing levels of trust of the applications supported by the primary and secondary lanes, they are placed at different levels of integrity. The nominal application (on the primary lane) is not trusted, so it is assigned to integrity level one. The back-up application is assumed to be free of design faults and is placed at integrity level two. This separation of the integrity levels on different lanes provides improved segregation ("fire-walling") between the two levels of integrity.

Note that whenj = n, it may be the (improbable) case that one node is joining and simultaneously one node is missing. A Generic Architecture for Real-Time Dependable Systems 37 Then, the averaged clock time T is computed as follows: • For j = 4, T is the mean of the two middle values. This corresponds exactly to the fault-tolerating function used in [LundeliusWelch & Lynch 1988]. Moreover, n is necessarily equal to 4, unless one node is joining (in which case n = 3 and will be set to 4 at the next cycle).

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A Generic Fault-Tolerant Architecture for Real-Time Dependable Systems by David Powell


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