All electrical equipment is susceptible to dangerous electrical surges. Whether the equipment is the modem on your computer, industrial equipment or a piece of the next generation broadband infrastructure, all can be rendered useless by electrical surges. These surges can be as dramatic as the lightning surge, shown on the screen or even a simple static charge. Either way, electrical equipment requires circuit protection to provide reliability to its users. We will now discuss Gas Discharge Tubes, designed to handle the more serious surges such as those induced by high voltage power lines or lightning.