Abstract: An apparatus includes a memory; and a processor coupled to the memory and configured to generate a first common key whose key value varies based on a first elapsed time when a notification of the first elapsed time after a start-up of another apparatus to which a data frame to be encrypted is to be transmitted has been made, generate a second common key whose key value varies based on a second elapsed time after a start-up of the apparatus when a notification of the first elapsed time has not been made, and encrypt the data frame by any one of the first common key and the second common key as a common key and transmit the encrypted data frame to the another apparatus.

Abstract: An electrical power control device is installed in each location in which an electric power generation facility and an electrical power storage facility are provided. The electrical power control device includes the processor that executes a process. The process includes storing therein, in an associated manner for each location, an evaluation value related to the electrical power transmission load of another location and the electrical power balance in the other location. The process includes selecting, based on the evaluation value and the electrical power balance stored in a storage when the electrical power balance in a subject location is less than a predetermined threshold, another location as the request destination of electrical power transmission. The process includes sending, to the other location selected at the selecting, a request indicating that electrical power needs to be transmitted from the other location to the subject location.

Abstract: A node transmits data based on a routing information table when receiving the data. The node determines whether a second candidate neighboring node of which flag information is true and to which the data has not yet been transmitted is present when the data transmission to a first candidate neighboring node fails. The node aborts retransmission of the data when no second candidate neighboring node of which the flag information is true and to which the data has not yet been transmitted is present.

Abstract: A node apparatus includes a receiving unit receiving a data frame from one of adjacent nodes apparatuses; a storing unit storing an identification information management table in which frame identification information with which the data frame may be uniquely identified, and overlapped data identification information; a processor which performs a process including: judging whether or not a final destination of the received data frame is the node apparatus itself; judging whether or not a registration that matches the frame identification information of the received data frame exists in the identification information management table; judging whether or not the overlapped data identification information of the received data frame and the overlapped data identification information corresponding to the registration match; and discarding the received data frame; and performing a retransmission of the received data frame to another adjacent node that has not been a transmission destination of the data frame.

Abstract: An apparatus includes a memory; and a processor coupled to the memory and configured to generate a first common key whose key value varies based on a first elapsed time when a notification of the first elapsed time after a start-up of another apparatus to which a data frame to be encrypted is to be transmitted has been made, generate a second common key whose key value varies based on a second elapsed time after a start-up of the apparatus when a notification of the first elapsed time has not been made, and encrypt the data frame by any one of the first common key and the second common key as a common key and transmit the encrypted data frame to the another apparatus.

Abstract: A node apparatus includes a receiving unit receiving a data frame from one of adjacent nodes apparatuses; a storing unit storing an identification information management table in which frame identification information with which the data frame may be uniquely identified, and overlapped data identification information; a processor which performs a process including: judging whether or not a final destination of the received data frame is the node apparatus itself; judging whether or not a registration that matches the frame identification information of the received data frame exists in the identification information management table; judging whether or not the overlapped data identification information of the received data frame and the overlapped data identification information corresponding to the registration match; and discarding the received data frame; and performing a retransmission of the received data frame to another adjacent node that has not been a transmission destination of the data frame.

Abstract: Anode device includes a transmitter and a processor. The transmitter transmits an inspection frame used in inspecting a status of a route from a source node device to a destination node device. The processor generates a first inspection frame and selects a first node device to which the transmitter transmits the first inspection frame from among candidates for a node device to which a frame addressed to the destination node device is to be forwarded. The processor judges whether a transmission of the first inspection frame has been successfully performed. When the transmission of the first inspection frame has failed, the processor generates a second inspection frame which records a failure in a communication with the first node device. The processor selects a second node device to which the transmitter transmits the second inspection frame from among the candidates.

Abstract: Anode device includes a transmitter and a processor. The transmitter transmits an inspection frame used in inspecting a status of a route from a source node device to a destination node device. The processor generates a first inspection frame and selects a first node device to which the transmitter transmits the first inspection frame from among candidates for a node device to which a frame addressed to the destination node device is to be forwarded. The processor judges whether a transmission of the first inspection frame has been successfully performed. When the transmission of the first inspection frame has failed, the processor generates a second inspection frame which records a failure in a communication with the first node device. The processor selects a second node device to which the transmitter transmits the second inspection frame from among the candidates.

Abstract: A node transmits data based on a routing information table when receiving the data. The node determines whether a second candidate neighboring node of which flag information is true and to which the data has not yet been transmitted is present when the data transmission to a first candidate neighboring node fails. The node aborts retransmission of the data when no second candidate neighboring node of which the flag information is true and to which the data has not yet been transmitted is present.

Abstract: A first node device transmits a first path information frame including first path information that associates a destination node device with a first forwarding destination to which the first node device forwards a data frame destined for the destination node device. A second node device other than the first node device receives the first path information frame. The second node device determines whether a forwarding path includes a loop. The forwarding path is a path from the second node device to the destination node device via the first node device and the first forwarding destination. The second node device stores the first path information upon determining that the forwarding path does not include a loop. The second node device forwards a data frame destined for the destination node device to the first node device on the basis of the first path information.

Abstract: An electrical power control device is installed in each location in which an electric power generation facility and an electrical power storage facility are provided. The electrical power control device includes the processor that executes a process. The process includes storing therein, in an associated manner for each location, an evaluation value related to the electrical power transmission load of another location and the electrical power balance in the other location. The process includes selecting, based on the evaluation value and the electrical power balance stored in a storage when the electrical power balance in a subject location is less than a predetermined threshold, another location as the request destination of electrical power transmission. The process includes sending, to the other location selected at the selecting, a request indicating that electrical power needs to be transmitted from the other location to the subject location.

Abstract: A cell count identifier inserting portion for inserting a cell count identifier into the header portion of a cell is provided at a predetermined position within an exchange and a plurality of cell counting portions for counting a cell into which a cell count identifier is inserted are provided on the downstream side of the cell count identifier inserting portion. A cell loss detecting portion compares the number of cells into which the cell count identifier is inserted with the number of cells counted by each of the cell counting portions, detects cell loss on the basis of the result of the comparisons and specifies the section in which cell loss is caused, if the cell loss is detected.