In order to provide a path switching apparatus capable of continuing communication by operation corresponding to the state of occurrence of a failure, this path switching apparatus is configured to be provided with a first switching device 1, a second switching device 2, a detection circuit 3, and a control circuit 4. The first switching device 1 switches, using a first switch, connection between a first submarine cable and either a predetermined optical path or a third submarine cable connected to an optical branching/insertion device. The second switching device 2 switches, using a second switch, connection between a second submarine cable and either the predetermined optical path connected to the first switch or the third submarine cable connected to the optical branching/insertion device.

In order to provide a path switching apparatus capable of continuing communication by operation corresponding to the state of occurrence of a failure, this path switching apparatus is configured to be provided with a first switching device 1, a second switching device 2, a detection circuit 3, and a control circuit 4. The first switching device 1 switches, using a first switch, connection between a first submarine cable and either a predetermined optical path or a third submarine cable connected to an optical branching/insertion device. The second switching device 2 switches, using a second switch, connection between a second submarine cable and either the predetermined optical path connected to the first switch or the third submarine cable connected to the optical branching/insertion device.

Submarine cable branching units with fiber pair switching configured to allow any number of trunk cable fiber pairs to access the optical spectrum any number of branch cable fiber pairs. Access to a particular branch terminal is not limited to predefined subset of the trunk fiber pairs. This approach allows fewer branch cable fiber pairs to be equipped in each branching unit, reducing system cost, simplifies system planning and provides flexible routing of overall trunk cable capacity.

In one embodiment, a switched amplifier is provided to amplify a data transmission. The switched amplifier may use a control signal that is received via a control signal channel in a transmission cable. Also, the switched amplifier may detect signal power to determine whether the data transmission is received at one of a first port and a second port. Data transmissions via the data transmission channel occur in a first direction and a second direction in a same frequency range in a time division multiplex (TDD) mode. Also, the control signal and data transmission are diverted from the transmission cable that transmits a type of signal different from the control signal and the data transmission. The switched amplifier is controlled based on the control signal or the signal power detected. The amplified signal is diverted in the first direction or the second direction via the data transmission channel back to the transmission cable.

In one embodiment, a switched amplifier is provided to amplify a data transmission. The switched amplifier may use a control signal that is received via a control signal channel in a transmission cable. Also, the switched amplifier may detect signal power to determine whether the data transmission is received at one of a first port and a second port. Data transmissions via the data transmission channel occur in a first direction and a second direction in a same frequency range in a time division multiplex (TDD) mode. Also, the control signal and data transmission are diverted from the transmission cable that transmits a type of signal different from the control signal and the data transmission. The switched amplifier is controlled based on the control signal or the signal power detected. The amplified signal is diverted in the first direction or the second direction via the data transmission channel back to the transmission cable.

A novel branching unit provided. The branching unit may include a first port for connecting a first power conductor disposed in a first optical cable, a second port for connecting a second power conductor disposed in a second optical cable, and a third port for connecting a third power conductor and a fourth power conductor disposed in a branch cable. The third port may include a first sub-port and a second sub-port. The first sub-port may be configured to connect the third power conductor of the branch cable. The second sub-port may be configured to connect the fourth power conductor of the branch cable.

Disclosed is an electrical module adapted to operatively connect to a transmission line. The electrical module includes a connection point adapted to connect to a network device. The electrical module is configured to receive a composite signal from the transmission line, the composite signal including a data component and a power component, and to separate the composite signal to extract the data component and the power component. The electrical module is further configured to transmit data to the network device through the connection point, and to supply power to the network device through the connection point. Also disclosed is a telecommunication system and method.

Disclosed is an electrical module adapted to operatively connect to a transmission line. The electrical module includes a connection point adapted to connect to a network device. The electrical module is configured to receive a composite signal from the transmission line, the composite signal including a data component and a power component, and to separate the composite signal to extract the data component and the power component. The electrical module is further configured to transmit data to the network device through the connection point, and to supply power to the network device through the connection point. Also disclosed is a telecommunication system and method.

A cable accessory device, including a one-way conducting element and a grounding electrode. One end of the one-way conducting element is connected to a conductor structure in a cable, and the other end is connected to the grounding electrode. By applying voltages with different polarities to the one-way conducting element, the one-way conducting element is enabled to have different on/off states. When the on/off state of the one-way conducting element is an on state, the conductor structure in the cable is connected to the grounding electrode via the one-way conducting element, so as to measure direct current resistance of the conductor structure. Moreover, when the on/off state of the one-way conducting element is an off state, the one-way conducting element breaks connection between the conductor structure and the grounding electrode, so as to measure insulation resistance of an insulation structure. In this way, tests for measuring direct current resistance of the conductor structure and insulation resistance of the insulation structure may be facilitated, so that failures of the cable may be comprehensively investigated to damages in the cable may be found in time, thus reducing subsequent costs in locating and maintenance.

In one embodiment, a switched amplifier is provided to amplify a data transmission. The switched amplifier may use a control signal that is received via a control signal channel in a transmission cable. Also, the switched amplifier may detect signal power to determine whether the data transmission is received at one of a first port and a second port. Data transmissions via the data transmission channel occur in a first direction and a second direction in a same frequency range in a time division multiplex (TDD) mode. Also, the control signal and data transmission are diverted from the transmission cable that transmits a type of signal different from the control signal and the data transmission. The switched amplifier is controlled based on the control signal or the signal power detected. The amplified signal is diverted in the first direction or the second direction via the data transmission channel back to the transmission cable.