A communication terminal device connected to a network and performing data communications between another communication terminal device through the network, includes a storage configured to store proper information used as a criterion for switching an operation mode between a master unit operation mode and a slave unit operation mode, and circuitry configured to switch the master unit operation mode of a self device to the slave unit operation mode based on the proper information, while the self device is operating by the master unit operation mode. The master unit operation mode is the operation mode of the communication terminal device operating as a master unit, and the slave unit operation mode is the operation mode of the communication terminal device operating as a slave unit.

A network traffic monitoring process of a communications network including: receiving data packets from a software-defined networking (SDN) flow switch; processing header of the received packets to identify its subsets belonging to respective network flows; detecting large network flows by determining a corresponding cumulative amount of data contained in the received packets for each of the network flow until it reaches or exceeds a predetermined threshold amount of data; for each detected large network flow, sending flow identification data to the SDN flow switch to identify further packets of the large network flow and to stop sending them to the network traffic monitoring component; periodically receiving from the SDN flow switch and processing the corresponding counter data and corresponding timestamp data to generate temporal metrics of the large network flow; and processing the generated temporal metrics with a trained classifier to classify the large network flow.

A vehicle (2) comprising at least one working unit (4) and a vehicle control system (6) comprising control units for controlling the vehicle to work in accordance with one or many working procedures. The vehicle is provided with a plurality of sensor units (12) configured to generate a sensor signal (14). Each control unit (8) is configured to determine control signals (18) to control its working unit (4), and the control unit designated to the vehicle is configured to determine control signals to control the vehicle, and also to determine control signals (18) for controlling at least one of the other working units (4) or the vehicle, and specifically to determine control signals (18) capable of controlling steps of a working procedure. At each point in time one of the control units is a master control unit being the control unit that is responsible for controlling its own working unit (4) and also at least one other working unit (4), and that at least two control units (8) are configured to be a master control unit. A determination procedure is provided to continuously determine if handover to another control unit, then being the new master control unit, should be made, and enabling the new master control unit to take control in accordance with the current working procedure if handover has been determined.

The present disclosure discloses a CANopen-based train network data transmission method. The method includes: monitoring, on an active network, a heartbeat packet transmitted through a first CAN channel by each slave node related to an active master node; determining whether the first CAN channel of each slave node is faulty; transmitting a reset instruction to a first node from the active network if no heartbeat packet of the first node is received within the preset first heartbeat period; learning, if no heartbeat packet of the first node is received, that the first CAN channel of the first node is faulty, and switching to a standby network to monitor the heartbeat packet transmitted by the first node; otherwise, receiving, on the standby network, data transmitted by the first node, and also receiving, on the active network, data transmitted by other slave nodes that normally transmit heartbeat packets.

This control system is provided with a controller, a controller which is a loopback communication device, a first communication route, and a second communication route. The controller generates and transmits control frames to slave devices. The controller performs loopback communication of the control frames. In the first communication route, multiple slave devices are connected between the controller and the controller using communication cables. In the second communication route, the first controller and the second controller are connected over a communication cable.

An industrial controller that controls operation of an industrial system. The industrial controller comprises a processor and a memory storing instruction, wherein the instructions cause the processor to perform certain functions. In particular, the instructions cause the processor to communicate high speed data in a first industrial protocol between the industrial controller and a high speed device during a first frame section but not during a second frame section of a controller frame of the industrial controller and communicate linking device data in a second industrial protocol between the industrial controller and a linking device during the second frame section but not during the first frame section or during the third frame section of the controller frame.

This application relates to the field of communications technologies, and discloses a service forwarding method and a network device that performs such method. The method includes: forwarding, by a first network device, a data packet of a first service to a second network device in a period (T.sub.1); and if the data volume of the forwarded first service reaches a threshold, forwarding, by the first network device, a data packet of a second service to the second network device. The first service is a low-latency service, and the second service is a non-low-latency service. In addition, the period (T.sub.1) is determined based on a delay allowed by a device for forwarding the data packet of the first service, and the threshold is a value determined based on a maximum transmission rate of the first service.

The invention relates to network interface module and a method of changing network configuration parameters on-the-fly within a network device. The network interface module comprises: a processor core arranged to execute a set of threads, the set of threads comprising a port servicing thread arranged to service requests received from a network port of the network interface module; and a task scheduling component arranged to schedule the execution of threads by the processor core. The network interface module is arranged to receive an indication that at least one network configuration parameter for the network port is required to be changed, and upon receipt of such an indication to mask the port servicing thread from being executed by the processor core, and enable the at least one network parameter for the network port to be changed whilst the port servicing thread is masked.

A system for in-vehicle network intrusion detection includes: (i) an anomaly detection module configured to obtain one or more network messages from one or more communication buses of a vehicle describing one or more events associated with the vehicle and detect whether at least some of the one or more events constitute an anomaly based on predefined rules to provide detected anomaly event data; (ii) a resident log generation module configured to generate one or more resident incident logs based on the detected anomaly event data, wherein the one or more resident incident logs comprise metadata associated with one or more detected anomalous events; and (iii) a transmitted log generation module configured to generate one or more transmitted incident logs based on the one or more resident incident logs, wherein each of the one or more transmitted incident logs corresponds to a resident incident log.

In an in-vehicle network, a master device and a plurality of slave devices communicate with each other. A plurality of semiconductor relays for supplying power to the corresponding slave devices is provided for each of the plurality of slave devices in the master device. IDs corresponding to the plurality of semiconductor relays are stored in a flash ROM of the master device. The master device transmits the corresponding ID each time the semiconductor relays are turned on by sequentially turning on the semiconductor relays. The plurality of slave devices set the ID received after power supply as its own ID.