摘要:
The goal of the present invention is to improve the useful data efficiency and reliability in the use of commercially available ETHERNET controllers, in a distributed real time computer system, by a number of node computers communicating via one or more communication channels by means of TT ETHERNET messages. To achieve this goal, a distinction is made between the node computer send time (KNSZPKT) and the network send time (NWSZPKT) of a message. The KNSZPKT must wait for the NWSZPKT, so that under all circumstances, the start of the message has arrived in the TT star coupler at the NWSZPKT, interpreted by the clock in the TT star coupler. The TT star coupler is modified, so that a message arriving from a node computer is delayed in an intelligent port of the TT star coupler until the NWSZPKT can send it precisely at the NWSZPKT into the TT network.
摘要:
Methods and apparatus are provided for evaluating the performance of a Time Triggered Ethernet (TTE) system employing Time Triggered (TT) communication. A real TTE system under test (SUT) having real input elements communicating using TT messages with output elements via one or more first TTE switches during a first time interval schedule established for the SUT. A simulation system is also provided having input simulators that communicate using TT messages via one or more second TTE switches with the same output elements during a second time interval schedule established for the simulation system. The first and second time interval schedules are off-set slightly so that messages from the input simulators, when present, arrive at the output elements prior to messages from the analogous real inputs, thereby having priority over messages from the real inputs and causing the system to operate based on the simulated inputs when present.
摘要:
A cluster comprises a plurality of end nodes that communicate with one another over at least one communication channel. Each end node is assigned a time slot for transmission of frames; wherein each node comprises a local guardian configured to prevent transmission of timing-related frames sourced from the respective end node. The cluster also comprises a special node that communicates with the plurality of end nodes, wherein the special node establishes a time base and sources timing-related frames to the plurality of end nodes. The transmission schedule includes at least one common scrubbing time slot during which each of the plurality of end nodes is configured to generate a timing-related frame. The special node is configured to determine if the local guardian in any of the plurality of nodes failed to prevent transmission of the respective generated timing-related frame during the common scrubbing time slot.
摘要:
A communication system comprises a plurality of nodes and a switch having a plurality of ports, each port coupled to one of the plurality of nodes. At least one of the plurality of nodes is configured to transmit a first unregulated flow of frames associated with a first virtual link to a first port of the plurality of ports of the switch. The switch is configured to regulate the first unregulated flow of frames by buffering frames of the first unregulated flow in a first input queue associated with the first virtual link, applying traffic shaping parameters associated with the first virtual link to the frames in the first input queue associated with the first virtual link, and outputting the first regulated flow of frames to one or more output queues associated with one or more output ports based on the first virtual link.
摘要:
A communication device comprises first and second circuits to implement a plurality of ports via which the communicative device is operable to communicate over a plurality of communication channels. For each of the plurality of ports, the communication device comprises: command hardware that includes a first transmitter to transmit data over a respective one of the plurality of channels and a first receiver to receive data from the respective one of the plurality of channels; and monitor hardware that includes a second receiver coupled to the first transmitter and a third receiver coupled to the respective one of the plurality of channels. The first circuit comprises the command hardware for a first subset of the plurality of ports. The second circuit comprises the monitor hardware for the first subset of the plurality of ports and the command hardware for a second subset of the plurality of ports.
摘要:
A distributed control system comprises a first network section comprising one or more control nodes containing control logic operable to perform control function computations; a second network section, wherein the second network section comprises; a plurality of additional nodes responsive to the one or more control nodes in the first network section, each of the plurality of additional nodes communicatively coupled to two neighbor nodes and to two skip nodes using a plurality of links; first and second gateway interfaces each coupled to the first and second network sections and each operable to interface the first network section to the second network section; wherein the first network section is operable to communicate signals using a first communication protocol; and wherein the plurality of nodes in the second network section are operable to communicate signals over the plurality of links using a second communication protocol that is different from the first communication protocol.
摘要:
A distributed engine control system is provided. The engine control system includes first and second engine data concentrators. Each of the first and second engine data concentrators include a processor module, a signal conditioning module coupled to the processor module, a data transfer module coupled to the processor module, and a data bus coupled between the first and second engine data concentrators and a hydro-mechanical unit (HMU).
摘要:
A network for a dual lane control system is provided. The network comprises at least one hub for a first channel and at least one hub for a second channel. A first plurality of end nodes is in a first lane. Each of the first plurality of end nodes is coupled to the first and second channels by being in communication with the hubs for the first and second channels. A second plurality of end nodes in a second lane are each redundant with a respective end node in the first lane. Each of the second plurality of end nodes is coupled to the first and second channels by being in communication with the hubs for the first and second channels.
摘要:
The invention relates to a method for synchronizing local clocks in a distributed computer network, where said computer network consists of a number of components that are connected to each other via bi-directional communication links, characterized in that an a priori configured set of components of the network generates synchronization messages and sends these synchronization messages to the network. An a priori configured set of components consumes the generated synchronization messages. One or more message-relaying components in between a component that generates a synchronization message and the component that consumes the synchronization message will add a delay value to the synchronization message reflecting the delay imposed by the message-relaying component. A component that is configured to consume a synchronization message will delay a received synchronization message upon reception for a duration that is calculated by an a priori configured value for the maximum transmission delay minus the value of the sum of all delay values added to the received message before further usage of the message in the synchronization process of said component.
摘要:
A half-duplex communication network comprises a plurality of communication links, each link being configured a priori to communicate in one direction; and a plurality of nodes, each node coupled to a first and second direct neighbor nodes and a first and second skip neighbor nodes via the plurality of communication links. Each node comprises propagation logic adapted to arbitrate conflicts between concurrent messages based on at least one of higher level policies and a comparison between a priority of each message, wherein each node is adapted to communicate a message without waiting to determine if another node is transmitting another message with a higher priority.