Abstract: An automatic failure recovery system that, using machine learning, creates an operation procedure for recovering from a network failure or corrects the created operation procedure has a plurality of recovery tasks for recovering from the network failure; outputs failure data indicating network configuration information and failure information acquired upon occurrence of the network failure; selects an execution procedure of the recovery tasks, based on the failure data and a recovery model acquired in advance; executes the selected execution procedure when the network failure occurs; determines whether or not recovery from the network failure was achieved by the execution procedure; and notifies that the procedure is to be corrected, depending upon the result of the determination and a recovery level of the network failure.

Abstract: A network monitoring system comprising: a prediction unit configured to acquire information needed for detecting an abnormality in a virtual network function provided in a virtualization infrastructure, and predict performance information of a virtual network function that is to be newly provided and monitored; a generation unit configured to generate an abnormality determination rule to serve as a reference for determining whether or not actual performance information of a virtual network function falls within an allowed range that is set based on the predicted performance information; a determination unit configured to perform abnormality determination using the actual performance information of the virtual network function and the abnormality determination rule; and an output unit configured to output an abnormality notification if it is determined by the determination unit that there is an abnormality.

Abstract: An automatic failure recovery system that, using machine learning, creates an operation procedure for recovering from a network failure or corrects the created operation procedure has a plurality of recovery tasks for recovering from the network failure; outputs failure data indicating network configuration information and failure information acquired upon occurrence of the network failure; selects an execution procedure of the recovery tasks, based on the failure data and a recovery model acquired in advance; executes the selected execution procedure when the network failure occurs; determines whether or not recovery from the network failure was achieved by the execution procedure; and notifies that the procedure is to be corrected, depending upon the result of the determination and a recovery level of the network failure.

Abstract: A network monitoring system comprising: a prediction unit configured to acquire information needed for detecting an abnormality in a virtual network function provided in a virtualization infrastructure, and predict performance information of a virtual network function that is to be newly provided and monitored; a generation unit configured to generate an abnormality determination rule to serve as a reference for determining whether or not actual performance information of a virtual network function falls within an allowed range that is set based on the predicted performance information; a determination unit configured to perform abnormality determination using the actual performance information of the virtual network function and the abnormality determination rule; and an output unit configured to output an abnormality notification if it is determined by the determination unit that there is an abnormality.

Abstract: A management apparatus for managing a plurality of controllers in a communication system, in which communication apparatuses belonging to a network are grouped into a plurality of groups, the plurality of controllers respectively corresponding to the plurality of groups are arranged, and each controller controls communication apparatuses of a corresponding group, is provided. The management apparatus includes a determination unit configured to determine failure states of the plurality of controllers, a selection unit configured to select, based on load values indicating load states of the plurality of controllers, at least one handover controller to which control of communication apparatuses of a group corresponding to a controller in the failure state will be handed over, and a notification unit configured to notify that the control of the communication apparatuses of the group corresponding to the controller in the failure state will be handed over to the handover destination controller.

Abstract: A management apparatus for managing a plurality of controllers in a communication system, in which communication apparatuses belonging to a network are grouped into a plurality of groups, the plurality of controllers respectively corresponding to the plurality of groups are arranged, and each controller controls communication apparatuses of a corresponding group, is provided. The management apparatus includes a determination unit configured to determine failure states of the plurality of controllers, a selection unit configured to select, based on load values indicating load states of the plurality of controllers, at least one handover controller to which control of communication apparatuses of a group corresponding to a controller in the failure state will be handed over, and a notification unit configured to notify that the control of the communication apparatuses of the group corresponding to the controller in the failure state will be handed over to the handover destination controller.

Abstract: A registry storage stores information of device configurations and device identifiers, on a per-device basis. A repository storage stores a correspondence between the device identifiers and device controllers which match the respective devices. A sub-plurality of the plurality of device controllers provide the same function, and are executed in the respective devices, by calling a common interface which is shared between the device controllers. At least one of the device identifiers which corresponds to one associated device is retrieved from the registry storage, a device controller which corresponds to the retrieved device-identifier is retrieved, the retrieved device controller is installed into a library and executed, and the executed device controller is uninstalled from the library.

Abstract: A technique of backing up data for networked storage devices using de-duplication is disclosed in which a communication device divides a to-be-stored new file into data blocks, defines and updates a statistical value representative of a history of reference to each data block within previous files, and transmits the statistical value to another communication device. The communication device, upon reception of the statistical value, selects a preloaded data block, based on the received statistical value, and transmits to another communication device a copying request for making a copy of a real data block identical to the preloaded data block. The communication device, upon reception of the copy, stores the copy as the preloaded data block.

Abstract: The present invention provides a service request reception control method which refuses a reception of the new service request without knowing the available quantity of hardware resource prospectively and without knowing the bottleneck reason prospectively. The service request reception control method for reception control in a server device receiving a processing request from a plurality of client apparatuses comprises the steps of calculating a mean time required for a series of processing to the request from the client apparatus; determining a load state of service by comparing the mean time with a targeted service processing time; and refusing a request reception from the client apparatus based on the load state.

Abstract: A registry storage stores information of device configurations and device identifiers, on a per-device basis. A repository storage stores a correspondence between the device identifiers and device controllers which match the respective devices. A sub-plurality of the plurality of device controllers provide the same function, and are executed in the respective devices, by calling a common interface which is shared between the device controllers. At least one of the device identifiers which corresponds to one associated device is retrieved from the registry storage, a device controller which corresponds to the retrieved device-identifier is retrieved, the retrieved device controller is installed into a library and executed, and the executed device controller is uninstalled from the library.

Abstract: A technique of backing up data for networked storage devices using de-duplication is disclosed in which a communication device divides a to-be-stored new file into data blocks, defines and updates a statistical value representative of a history of reference to each data block within previous files, and transmits the statistical value to another communication device. The communication device, upon reception of the statistical value, selects a preloaded data block, based on the received statistical value, and transmits to another communication device a copying request for making a copy of a real data block identical to the preloaded data block. The communication device, upon reception of the copy, stores the copy as the preloaded data block.

Abstract: In the invention, an input light including a signal light and a noise light within a signal wavelength band of the signal light is divided into a first component with a polarization parallel to a polarization direction of the signal light and a second component with a polarization orthogonal to the polarization direction of the first component. The first component is supplied into a first arm and the second component into a second arm. The optical phase of the second component in the second arm is shifted so that the optical phase of the second component in the second arm relatively differs by ? from the optical phase of the first component in the first arm. The first component output from the first arm and the second component output from the second arm are combined to make the noise lights included in the first and second components interfere with each other.

Abstract: To realize a highly reliable monitor control signal network at low costs, a data transmission system comprises a first network to optically transmit a data signal and a monitor control signal, first and second nodes connecting to the first network, and a second network capable of transmitting the monitor control signal.

Abstract: A test signal light intensity-modulated with a test data is generated and enters the optical transmission line. An extractor extracts the first and second optical components from the test signal light output from the optical transmission line, the first and second optical components composed of any one of a main signal light component, an upper sideband component, and/or a lower sideband component. A time difference measuring apparatus measures a time difference between the first and second optical components. A converter converts the measured time difference into a chromatic dispersion value.

Abstract: An optical reception apparatus comprises an optical receiver to receive an optical signal from an optical transmission line, an error corrector to correct an error of the received signal and to transmit the error-corrected signal and error rate information before error correction, a judging apparatus to judge transmission quality of the optical transmission line according to the error rate information from the error corrector and a threshold value equal to an error rate lower than an error correction limit of the error corrector, and a selective breaker to transmit the signal whose error is corrected by the error corrector in normal state and to block transmission of the signal whose error is corrected by the error corrector when the judged result by the judging apparatus indicates deterioration of the transmission quality of the optical transmission line.

Abstract: When there occurs a fault in any path of the MPLS or GMPLS network, a node which has detected the fault sends a notify message which is fault event information. A node which performs fault recovery receives the notify message (S1) and counting of the waiting time is triggered by this reception (S2). During this waiting time, LSA of OSPF is collected. When the waiting time is terminated, the node which performs fault recovery calculates alternative path based on the notify message and the LSA of OSPF (S3) and carries out fault recovery by restoration (S4).

Abstract: A test signal light intensity-modulated with a test data is generated and enters the optical transmission line. An extractor extracts the first and second optical components from the test signal light output from the optical transmission line, the first and second optical components composed of any one of a main signal light component, an upper sideband component, and/or a lower sideband component. A time difference measuring apparatus measures a time difference between the first and second optical components. A converter converts the measured time difference into a chromatic dispersion value.

Abstract: An optical signal processor comprises a first input terminal for a pulse signal light with a signal wavelength, a second input terminal for a probe light with, probe wavelength different from the signal wavelength, a first splitter to split the probe light into two portions, an XPM optical device to modulate the one portion of the split output lights from the splitter, a second splitter to split light with the probe wavelength phase-modulated by the XPM optical device into two portions, a first combiner to combine the other portion of the split output lights from the first splitter with the one portion of the split output lights from the second splitter, and a second combiner to combine the other portion of the split output lights from the second splitter with the output light from the first combiner.

Abstract: In the invention, an input light including a signal light and a noise light within a signal wavelength band of the signal light is divided into a first component with a polarization parallel to a polarization direction of the signal light and a second component with a polarization orthogonal to the polarization direction of the first component. The first component is supplied into a first arm and the second component into a second arm. The optical phase of the second component in the second arm is shifted so that the optical phase of the second component in the second arm relatively differs by &pgr; from the optical phase of the first component in the first arm. The first component output from the first arm and the second component output from the second arm are combined to make the noise lights included in the first and second components interfere with each other.

Abstract: An optical signal processor comprises a first input terminal for a pulse signal light with a signal wavelength, a second input terminal for a probe light with a probe wavelength different from the signal wavelength, a first splitter to split the probe light into two portions, an XPM optical device, to which one portion of the split output lights from the first splitter and the pulse signal light enter, to modulate the one portion of the split output lights from the splitter according to amplitude variation of the pulse signal light, a second splitter to split the light with the probe wavelength phase-modulated by the XPM optical device into two portions, a first combiner to combine the other portion of the spilt output lights from the first splitter with the one portion of the split output lights from the second splitter in in-phase relation during a period corresponding to a non-pulse period of the pulse signal light, and a second combiner to combine the other portion of the split output lights from the seco