Consider a system of computers and communication networks supporting a bank's cash dispensing machines. The machines provide instant money on the street on production of a cash card and a personal identification code with the only prerequisite being that of a positive bank balance.
The communication network must be reliable – that is, not subject too often to break downs. The reliability of the system, or each part of the system, will depend on each component part.
A very simple system, with only two components, can be configured in series or in parallel. If the components are in series then the system will fail if one component fails (Figure 21.1).
Figure 21.1 Component A and B must function for the ...
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