INTRODUCTION
The increasing usage of computers achieves an improvement in the
industrial process and quality control. It has now become a necessity
for many application to work in a local area network in order to
exchange information within the project group or department.
Statistics indicate that the problems caused by surge voltages
in date lines have increased over the last years, along with a high
volume of economic losses. This is due to the high number of computer
systems used and their high inherent sensitivity to surge voltages.

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