An optical/electrical composite cable in which a first connector having an optical transmission unit is connected to a second connector having an optical reception unit via an electrical wire and an optical wiring line includes a state detection unit that detects a connection state of the first connector, a connection state of the second connector, a power supply state of a transmission-side electronic device connected to the first connector and a power supply state of a reception-side electronic device connected to the second connector, and an electrical power supply control unit that controls supply of electrical power to the optical transmission unit and optical reception unit according to the detected states.
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