Converter is a device that changes the HD-SDI or EX-SDI signals back to EX-SDI or HD-SDI signals. Generally, it is used when changing EX-SDI for long HD-SDI transmission. On the other hand, the receiver changes the EX-SDI signal back to the original HD-SDI signal. The Extender is used for long distance transmission of EX-SDI or HD-SDI signals. Signals transmitted through Coax cables will cause distortion as the distance increases. When this kind of distortion occurs, signals can be restored using a repeater device. If transmissions of kilometers is needed, multiple repeaters can be used.