Abstract: An optical connectable closed-circuit television (CCTV) camera apparatus and a CCTV system are disclosed herein. The CCTV camera apparatus includes an optical splitter, an optical combiner, an optical reception unit, an optical transmission unit, a communication control unit, a camera function control unit, and an image processing unit. The optical splitter splits a downstream optical signal into a branch optical signal and a pass-through optical signal. The optical combiner optically combines an outgoing video optical signal and an upstream optical signal. The optical reception unit receives the branch optical signal, and converts the branch optical signal. The optical transmission unit receives and converts an outgoing video electric signal. The communication control unit interprets an address, outputs a control command or data or discards the incoming electric signal, and generates the outgoing video electric signal. The camera function control unit controls various functions.

Abstract: An industrial controller includes a control unit, a first optical transmission/reception unit, a second optical transmission/reception unit, and a switching unit. The control unit handles a downlink transmission frame depending on whether or not the Protocol Control Information (PCI) of the downlink transmission frame corresponds to an ID of an industrial controller device, and internally generates and outputs an uplink transmission frame. The first optical transmission/reception unit externally sends or receives the uplink or downlink transmission frame. The second optical transmission/reception unit has at least one port, and externally sends or receives the uplink or downlink transmission frame. The switching unit sequentially transfers the downlink and uplink transmission frames, transfers the uplink transmission frame to the first optical transmission/reception unit, and transfers the downlink transmission frame to the second optical transmission/reception unit.