CATV (cable TV) is a connection protocol that transmits video and audio signals over a coaxial cable, which is the standard connection for cable TV service. A CATV line enters a building where it typically connects to a set top cable box. In some cases, such as connecting two TVs to the same cable box, you might want to run a CATV directly to a high-definition TV equipped with an HDMI (high definition media interface) jack. Powered converters available at electronics stores connect the CATV cable on one end with the HDMI cable on the other.
Disconnect the power cords for all electronic components before attaching the CATV and HDMI cables to the adapter, if the cables are hooked up on the other ends to audio-video equipment.
Turn the metal nut on the end of the CATV clockwise around the threaded input jack on the adapter.
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Insert the plug on one end of the HDMI cable into the labeled port on the adapter with the shorter edge of the plug turned downward.
Reconnect the power cords for the equipment, including the electrical cord for the adapter.