Fiber optic box play an important role in the lighting and safety features of present day automobiles. They are widely used in lighting, both in the interior and exterior of vehicles. Because of its ability to conserve space and provide superior lighting, fiber optics is used in more vehicles every day. Also, fiber optic box can transmit signals between different parts of the vehicle at lightning speed. This makes them invaluable in the use of safety applications such as traction control and airbags. Internet Fiber optic box transmit large amounts of data at very high speeds. This technology is therefore widely used in internet box. Fiber optic box can transmit more data than traditional copper wires, which are light and flexible and carry more data. Cable Television The use of fiber optic box in the transmission of cable signals has grown explosively over the years. These box are ideal for transmitting signals for high definition televisions, because they have greater bandwidth and speed. Also, fiber optic box are cheaper as compared to the same quantity of copper wire. In some cases, these box become defective and lose their ability to properly transfer a signal. However, you can test the signal strength of these box with a fiber-optic cable tester. You can test a fiber optic cable easily with the help of this device. Connect one end of your fiber-optic cable to the port on your cable tester. Connect the other end of your cable to the other port on your tester. Turn your cable tester on by pressing the "Power" button on the front of the device. The tester will immediately test the cable and present the relevant information to you on its digital display. If the power level is greater than 5 or less than -77, the cable is considered defective and a number will not show on the display.