Patent ID: 8458378

Claim:
A cable comprising: a first plug and a second plug; a voltage application line including a metal wire connected between the first plug and the second plug to which a voltage is applied from one of the first plug and the second plug; a first transmission line including a first plurality of optical fibers connected between the first plug and the second plug and configured to transmit a video signal from the first plug to the second plug; a second transmission line including a second plurality of optical fibers connected between the first plug and the second plug and configured to transmit the video signal from the second plug to the first plug; a first circuit switching unit configured to connect the first plug to one of the first transmission line or the second transmission line; a second circuit switching unit configured to connect the second plug to one of the first transmission line and the second transmission line; and a controller connected to the voltage application line and configured to detect a transmission direction of the video signal by determining which of the first plug or the second plug has applied the voltage to the voltage application line, the controller further configured to control the first circuit switching unit and the second circuit switching unit in accordance with the detected transmission direction and connect the first plug and the second plug with one of the first transmission line and the second transmission line.