According to one or more embodiments of the disclosure, a particular networking device joins a ring network of networking devices that has a ring topology. The particular networking device monitors the ring network for a multicast frame used within the ring network to detect link failures. The particular networking device determines that a link in the ring network has failed, based on the particular networking device not receiving the multicast frame within a threshold amount of time. The particular networking device initiates repair of the ring network, when the particular networking device determines that the link in the ring network has failed.

A wiring system for an automobile connecting a processor and a plurality of devices, using one or more backbone sections. The processor and devices are connected to one another to form a first loop and a second loop, such that data may be transmitted along the first loop and data may be transmitted along the second loop.

A wiring system for an automobile connecting a processor and a plurality of devices, using one or more backbone sections. The processor and devices are connected to one another to form a first loop and a second loop, such that data may be transmitted along the first loop and data may be transmitted along the second loop.

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.

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.

A high availability aircraft network architecture incorporating smart points of presence (SPoP) is disclosed. In embodiments, the network architecture divides the aircraft into districts, or physical subdivisions. Each district includes one or more mission systems (MS) smart network access point (SNAP) devices for connecting MS components and devices located within its district to the MS network. Similarly, each district includes one or more air vehicle systems (AVS) SNAP devices for connecting AVS components and devices within the district to the AVS network. The AVS network may remain in a star or hub-and-spoke topology, while the MS network may be configured in a ring or mesh topology. Selected MS and AVS SNAP devices may be connected to each other via guarded network bridges to securely interconnect the MS and AVS networks.

A high availability aircraft network architecture incorporating smart points of presence (SPoP) is disclosed. In embodiments, the network architecture divides the aircraft into districts, or physical subdivisions. Each district includes one or more mission systems (MS) smart network access point (SNAP) devices for connecting MS components and devices located within its district to the MS network. Similarly, each district includes one or more air vehicle systems (AVS) SNAP devices for connecting AVS components and devices within the district to the AVS network. The AVS network may remain in a star or hub-and-spoke topology, while the MS network may be configured in a ring or mesh topology. Selected MS and AVS SNAP devices may be connected to each other via guarded network bridges to securely interconnect the MS and AVS networks.

A plurality of slaves include a first slave constituting the start and end points of a ring wiring and a plurality of second slaves connected between the start and end points, the ring wiring being capable of configuring a first path via which the second slaves cause data accepted from the start point side to be cyclically transferred to the end point side, and a second path for each slave to loop back the data from the device itself when the path between the slave and an adjacent slave is cut off disconnected. When the path is recovered from the disconnection, a master transmits a command for switching the second path to the first path to the slave that carries out the loopback, and sends out data after the elapse of a time based on a propagation delay time from the time of this transmission.

A plurality of slaves include a first slave constituting the start and end points of a ring wiring and a plurality of second slaves connected between the start and end points, the ring wiring being capable of configuring a first path via which the second slaves cause data accepted from the start point side to be cyclically transferred to the end point side, and a second path for each slave to loop back the data from the device itself when the path between the slave and an adjacent slave is cut off disconnected. When the path is recovered from the disconnection, a master transmits a command for switching the second path to the first path to the slave that carries out the loopback, and sends out data after the elapse of a time based on a propagation delay time from the time of this transmission.

A switch comprises: a register; a control entry holding part that holds control entries set by a predetermined control apparatus; a packet processing part that selects a control entry to be applied to a received packet by referring to a value on the register in addition to match conditions for the control entry; a register change part that changes the value on the register in a case where a change instruction for the value on the register is set to the control entry selected.