| Specification
of System Reliability |
| Example: ATM
card reader |
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| Failure
class Example Metric |
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| Permanent
System fails to operate 1 per
1,000 days |
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| non-corrupting
with any card -- reboot |
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| Transient
System can not read 1 in
1,000 transactions |
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| non-corrupting
an undamaged card |
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| Corrupting
A pattern of Never |
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transactions corrupts |
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database |
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| 8 |