The invention relates to a method for transmitting messages in a computer network, and to a computer network of this type. The computer network comprises computing nodes (101-105), said computing nodes (101-105) being interconnected via at least one star coupler (201) and/or at least one multi-hop network (1000), wherein each computing node (101-105) is connected via at least one communication line (110) to the at least one star coupler (201) and/or the at least one multi-hop network (1000), and wherein the computing nodes (101-105) exchange Ethernet messages with one another and with the at least one star coupler (201) and/or the at least one multi-hop network (1000). A set of two or more components are directly connected to one another in each case by two or more communication lines (110, 111), wherein each component in the set is either a computing node (101-105) or a star coupler (201), and sending components in the set of components send to at least two of the two or more communication lines (110, 111) at least a proportion of the Ethernet messages that are to be sent, and receiving components in the set of components then accept and/or forward at least a proportion of the Ethernet messages received via the two or more communication lines (110, 111) only if at least two identical messages are received via at least two different communication lines.

A redundancy device which is configured to communicate with a redundancy opposite device and perform a redundancy execution, the redundancy device includes receivers configured to receive individually HB signals transmitted from the redundancy opposite device, a calculator configured to calculate a number of normal communication paths among communication paths of the HB signals based on a reception result of the receivers, a comparator configured to compare a calculation result of the calculator with a predetermined threshold value, and a changer configured to change the redundancy device from a standby state to an operating state, or change the redundancy device from the standby state to a not-standby state in which the redundancy execution is released, based on the calculation result of the calculator and a comparison result of the comparator.

The present invention concerns a flight control system of an aircraft comprising: —a first processing unit (1), —a second processing unit (2), —communication means configured to establish a first two-way digital link (3) and a second two-way digital link (4) between the first processing unit (1) and the second processing unit (2), said second link (4) being redundant with the first link (3), and said first link (3) and second link (4) being likely to be active concomitantly, said system further comprising backup communication means enabling data exchanges between the first processing unit (1) and the second processing unit (2) in the case of a failure in the first link (3) and second link (4), said backup communication means comprising an array of sensors or actuators (13) and/or a secure onboard network for the avionics (14).

A power sourcing equipment (PSE) chip, and a Power over Ethernet (PoE) device and method are provided, which can determine a status that a peer end is connected to a powered device (PD) when four cable pairs are used to supply power. The PSE chip includes a channel controller, a first channel detector, and a second channel detector. The channel controller sends detection voltages along a first and a second groups of cable pairs in an Ethernet twisted pair; determines a first impedance and a second impedance according to the detection voltages and corresponding currents that are detected; and determines that a first group or a second group of cable pairs is connected to a valid PD according to the impedances and a preset range.

A terminal apparatus, comprises an inspection execution part that executes an inspection by transmitting a test packet to a prescribed destination apparatus reached via a plurality of logical links, the logical link being configured by a switch having a function of aggregating a plurality of physical links between the switch and an adjacent switch to use the physical links as a logical link, and a test packet creation part that creates, based on a rule of selecting a physical link as a component of the logical link by the switch, a plurality of kinds of test packets for which a transmission source address(s) of the test packet(s) is(are) so rewritten to enable confirmation of normality of the plurality of physical links between the terminal apparatus and the prescribed destination apparatus.

A user station for a bus system and a method for broadband CAN communication are provided. The user station includes a control unit for controlling an access of the user station via a first bus system to a bus of a second bus system of the communication system, the first bus system being designed for a communication, in which at least at times an exclusive, collision-free access of one of at least two user stations of the communication system to a bus of the first bus system is ensured, and the bus of the second bus system having at least two channels, via which it is possible to transmit messages of the at least two user stations of the communication system in different separate frequency ranges temporally independently of one another.

Method for operating a network having a prescribable topology, wherein the topology contains a plurality of network devices which are connected to one another and interchange data via multiwire data lines connected to their data ports, wherein test messages are also sent to the data lines in order to check whether or not two data ports on two network devices have the connection between them via the interposed data line, characterized in that, in a prescribable time interval, the number of cyclic redundancy check (CRC) errors which have occurred and the number of data items transmitted in this time interval are ascertained on a data line between two data ports, and at least these two values are used to calculate an error rate which is a measure of the operability of the multiwire data line.

A method for downhole communication between multiple sets of sensors along a single wire bus includes communicating between a first set of sensors through the single wire bus. The first set of sensors include legacy sensors communicating at a legacy communication frequency. The method also includes communicating between a second set of sensors through the single wire bus. The second set of sensors communicates at a second communication frequency an order of magnitude greater than the legacy communication frequency. Further, the method includes communicating between a third set of sensors through the single wire bus. The third set of sensors communicates at a third communication frequency an order of magnitude greater than the legacy communication frequency.

Efficient codeword synchronization methods and systems for fiber channel protocol are disclosed. The method includes identifying a codeword boundary by detecting 100-bit known patterns in a bit codeword in a transmission.

A method for redundant transmission of data telegrams between automation devices of an installation by a communication network requires a ring topology. A sending device sends out two data telegrams in different transmission directions of the communication network and a receiving device processes the data telegram arriving at the receiving device first and discards the other data telegram as a duplicate. To ensure fast transmission of data telegrams having important content, the sending automation device assigns a priority level and data telegrams having a high priority level are sent according to a first communication protocol and data telegrams having a low priority level are sent according to a different second communication protocol. A network component arranged between the sending device and the receiving device receives the data telegram, recognizes the priority level based on the communication protocol used, and forwards the data telegram taking into consideration the priority level.