A communication unit receives a message in a network. A first anomaly detector detects an anomalous message by detecting values of a plurality of monitoring items from the message received by the communication unit and determining whether each of the detected values of the plurality of monitoring items is inside a corresponding first reference range and a corresponding second reference range. The second reference range is narrower than the first reference range. The first anomaly detector detects the message as the anomalous message, when any of the detected values is outside the first reference range, and detects the message as the anomalous message, when any of the detected values is inside the first reference range and is outside the second reference range and when a predetermined rule is satisfied.

A system and method for monitoring data traffic on a MIL-STD-1553 data bus system with a data guard. The monitoring system includes a data guard, which may be toggled between a passive mode and an active mode using two switches. In the active mode, using a first switch, data traffic from remote terminals on the MIL-STD-1553 data bus system are placed on a guarded bus of the data guard system and sent to the data guard by way of a coupler for filtering data messages through a plurality of pre-generated data set rules. If the data traffic is validated, it is returned to the MIL-STD-1553 data bus system through a second coupler. In the passive mode, the data traffic is directed to a transparent bus by way of a third coupler using a second switch, thus allowing the MIL-STD-1553 data bus system to operate without latency concerns.

A method for averting a manipulation on a CAN bus using a first node connected to the bus by a CAN controller includes a secured transmit module of the first node monitoring the bus; the transmit module recognizing transmission processes of the CAN controller in a normal operation of the first node; the transmit module recognizing a message transmitted impermissibly on the bus in a manner deviating from the normal operation; and, in the event the transmit module recognizes the message, the transmit module initiating countermeasures provided against the manipulation.

Representative implementations of devices and techniques provide communication between networked nodes while minimizing interference from neighbor network communication. Medium Access Control (MAC) cycles at the nodes may be aligned to MAC cycles of neighbor nodes and/or networks based on decoded timing information detected by the nodes.

Representative implementations of devices and techniques provide communication between networked nodes while minimizing interference from neighbor network communication. Medium Access Control (MAC) cycles at the nodes may be aligned to MAC cycles of neighbor nodes and/or networks based on decoded timing information detected by the nodes.

The present disclosure relates to device including first and second terminals connected to a bus, third and fourth terminals connected to power supply and reference potentials. A first transistor and a first resistor are in series between the first terminal and a first diode connected to the third terminal. A second resistor, a second transistor and a second diode are in series between the first and fourth terminals. A third transistor and a third resistor are in series between the first diode and the second terminal. A fourth resistor, a fourth transistor and a third diode are in series between the second and fourth terminals. At each consecutive transmission of a dominant bit and of a recessive bit, a circuit sets the transistors at the ON state during a time period starting with the recessive bit.

A FlexRay network guardian including: a resetting leading coldstart node (RLCN) detector configured to detect a RLCN failure; a deaf coldstart node (DCN) detector configured to detect a DCN failure; a babbling idiot (BI) detector configured to detect a BI failure; and a FlexRay network decoder configured to output a signal regarding the status of the FlexRay network to the RLCN detector, DCN detector, and BI detector, wherein the RLCN detector, DCN detector, and BI detector are configured to send an indication of a failure to a containment module.

An optical signal repeater includes a plurality of ports, each configured to be connectable to both of a first optical transceiver for transmitting and receiving an optical signal to and from the optical line terminal and a second optical transceiver for transmitting and receiving an optical signal to and from the optical network unit. The optical signal repeater further includes a port switching control unit which switches each of the plurality of ports between a first port adapted to the first optical transceiver and a second port adapted to the second optical transceiver and a path switching unit configured to switch a transmission path between the plurality of ports. The path switching unit includes an aggregation unit configured to aggregate the transmission paths from the second ports. The optical signal repeater further includes a path switching control unit configured to control the path switching unit.

A fraud detection method includes: determining whether a period of a message repeatedly transmitted in an in-vehicle network is anomalous; detecting whether arbitration occurs when the message is transmitted in the in-vehicle network; and determining that the message is an anomalous message, in the case where the period of the message is anomalous and no arbitration occurs when the message is transmitted in the in-vehicle network.

A detection device to be used in an in-vehicle network including a CAN (Controller Area Network) bus and a plurality of function units connected to the CAN bus includes: a measurement unit configured to measure a signal waveform of a frame transmitted in the CAN bus; a calculation unit configured to calculate a plurality of kinds of feature amounts of the signal waveform measured by the measurement unit; and a detection unit configured to detect an abnormality regarding the CAN bus, based on each of the feature amounts calculated by the calculation unit.