Abstract: A failure detection apparatus for submarine optical cables having a redundant configuration, the apparatus comprising, with a view to detecting a failure in an active transmission path and a standby transmission path: a first optical coupler which branches and outputs a supervisory signal to the active transmission path and the standby transmission path; a second switch functional unit which outputs the supervisory signal outputted from either the active transmission path or the standby transmission path that is specified as a test transmission path; and a transmission path monitoring unit which, on the basis of the supervisory signal received from the second switch functional unit, detects a failure taking place in said test transmission path.

Abstract: To simplify the works a user needs to perform while ensuring a proper operation of a submarine device. A submarine cable system (10) according to an example embodiment includes: a submarine device (11); a first line terminal equipment (1) and a second line terminal equipment each adapted to perform communication with the submarine device (11); and a control apparatus (20) configured to select either one of the first line terminal equipment (1) or the second line terminal equipment (2) based on an order of priorities thereof and to instruct the selected one of the line terminal equipment to output a control signal to the submarine device (11). The order of the priorities is based on a distance from the first line terminal equipment (1) to the submarine device (11) and a distance from the second line terminal equipment (2) to the submarine device (11).

Abstract: This communication system is equipped with a plurality of transceiver devices each composed of a transmission device that transmits unit data and a reception device that receives unit data from the transmission device. The transmission devices are connected in series. Each of the transmission devices stores identification information for identifying the device itself. The transmission device accepts unit data from a front stage side. The transmission device generates identification information for identifying one of the transmission devices from information included in the accepted unit data, in accordance with a predetermined generation process. In a case that the generated identification information corresponds to the stored identification information, the transmission device transmits the accepted unit data to the reception device.

Abstract: This communication system is equipped with a plurality of transceiver devices each composed of a transmission device that transmits unit data and a reception device that receives unit data from the transmission device. The transmission devices are connected in series. Each of the transmission devices stores identification information for identifying the device itself. The transmission device accepts unit data from a front stage side. The transmission device generates identification information for identifying one of the transmission devices from information included in the accepted unit data, in accordance with a predetermined generation process. In a case that the generated identification information corresponds to the stored identification information, the transmission device transmits the accepted unit data to the reception device.