The reliability of a system can be increased by employing the method of worst case design, using high-quality components and imposing strict quality control procedures during the assembly phase. However such measures can increase the cost of a system significantly. An alternative approach to reliable system design is to incorporate redundancy (i.e. additional resources) into a system with the aim of masking the effects of faults. This approach does not necessitate the use of high-quality components; instead standard components can be used in a redundant and reconfigurable architecture (see Chap.4). In view of the decreasing cost of hardware components it is certainly less expensive to use the second approach to design reliable systems.
fault tolerant fault testable hardware design parag k lala 1984 phi rapidshare
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