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Thesis (M.Eng.(Electrical Engineering))--University of Pretoria, 2001. / Summaries in Afrikaans and English. Includes bibliographical references.

A systematic framework has been developed to assess what it is that is at risk in any given telephone exchange. This critical area procedure is designed to identify high risk areas, both in terms of potential property damage and business interruption. This procedure utilizes a functionally based approach that is pictorial in presentation n and well suited to management decision making processes.

M.Comm. / A modern electronic telephone exchange is very flexible in terms of size. Such exchanges can vary in size from a few lines to more than 50 000 lines. They can be expanded at any time to cater for more subscribers. This means that the telecommunications service provider is able to build the exchange just large enough to supply service to the subscribers in the area, and then expand the exchange on a regular basis as needed to cater for any growth in demand for exchange connections. The main advantage of this flexible approach is that money is not tied up in very expensive exchange equipment which is not being used.