133 results about "Switched ethernet" patented technology

Public wireless communications will increasingly extend into wireless LAN (WLAN) environments in order to meet the ubiquitous access, high data rate, and local services demands of future Internet appliances. By relying on IP-level services mechanisms, the Public Access Mobility LAN (PAMLAN) can simultaneously support different air interfaces, franchises for multiple services providers, and a multi-segment LAN environment including handoffs. The PAMLAN supports virtual operator LANs representing different network services providers, authorization and accounting mechanism, support of multiple air interfaces, and local IP mobility. A router associated with each base station realizes this highly distributed IP networking environment, and a QoS-enabled switched Ethernet core supports virtual networks and QoS services.

A virtual networking system and method are disclosed. Switched Ethernet local area network semantics are provided over an underlying point to point mesh. Computer processor nodes may directly communicate via virtual interfaces over a switch fabric or they may communicate via an ethernet switch emulation. Address resolution protocol logic helps associate IP addresses with virtual interfaces while allowing computer processors to reply to ARP requests with virtual MAC addresses.

An avionics switched Ethernet network. A plurality of synchronized interconnected system nodes each includes an avionics module arranged to periodically provide a set of data messages. Each message includes a set of data variables. A network module couples the avionics module to the network. The network module includes a network interface unit arranged to provide for transmission of data packets including a number of the data messages from the avionics module. The network module of each system node includes a transmission control unit arranged to control the network interface unit to perform scheduled transmissions of the data packets. The transmission control unit is provided with access to a memory module. Each of the plurality of time-slots is statically allocated a predetermined number of data packets, each including a predetermined subset of data messages from the set of data messages.

The invention discloses a simulation system of simulating switched Ethernet clock synchronization. The simulation system comprises an Ethernet protocol instruction database, a timer, nodes, a link attribute configuration module, a synchronization topology generation module, a state management module, a state conversion module, a data processing module, a fault detection and processing module, a clock correction module and a result output module. The Ethernet protocol instruction database and the timer satisfy an IEEE802.3ISO/IEC8802-3 standard specification and instruction and state association information indicated in SAEAS6802. The nodes and the link attribute configuration module are used to carry out simulation role configuration so as to obtain a synchronization topology structure. Then, state role management is performed on each node in the synchronization topology structure and different state roles are used to carry out data processing, clock correction and fault detection. And then a state and clock correction result is output. Compared to the current simulation system, by using the simulation system of the invention, strong scalability is showed on an aspect of network model establishment, which is convenient to carry out an effective analysis on a clock synchronization process.

Methods and apparatus are provided for managing data communications between hosts (9) of a switched Ethernet network (8). Hosts (9) are assigned to logical groups of hosts such that the hosts participating in a data communication are assigned to the same group. In a switch (1) of the network, each group is associated with a service class indicative of requirements for forwarding data across the switch (1) for data communications between hosts (9) in that group. Data received by the switch (1) is forwarded across the switch in a manner dependent on the service class of the group to which hosts (9) participating in the data communication are assigned. In the switch (1), data communications between hosts (9) in one or more of said groups are disabled when required to satisfy the forwarding requirements for at least one said service class.

The invention provides a simulation and demonstration system for design and validation of an AFDX (Avionics Full Duplex Switched Ethernet) network and a simulation and demonstration method thereof, which are used for guiding the design of the AFDX network. The simulation and demonstration system mainly comprises an integrated avionics network design module, a loaded avionics communication task module, a plausibility check and validation module, a simulation module, a loadable configuration file output module, a network demonstration system module, and the like and has the functions of designing the avionics interconnection structure, simulating communication tasks of the AFDX network and validating the designed network topology in the network demonstration system module. The simulation and demonstration method is used for designing the network topology, simulating the avionics communication tasks and demonstrating and validating the designed network to obtain related technical parameters and provide the reference for the design of the AFDX network. The invention provides a more reliable scheme for the design of the AFDX network, shortens the design time, saves the cost, and improves the design efficiency.

The invention discloses a method and device of simultaneously supporting AFDX ((Avionics Full-duplex Switched Ethernet) and common Ethernet switching, which mainly solves the problem that AFDX switching equipment in the prior art cannot simultaneously support the AFDX and common Ethernet switching. The method comprises the steps of: (1), extracting grouping feature information; (2), receiving scheduling groups; (3), searching a forwarding table; (4), filtering and policing; (5), enqueueing the group; and (6) sending the scheduling groups. The device comprises an input caching module, a receiving scheduling module, a port lookup table module, a sharing lookup table module, a filtering and policing module, an output queue module, a sending scheduling module, and an output caching module. The invention has the advantages of improving the flexibility of an AFDX networking mode and the feasibility that an Ethernet information terminal in a manned space flight domain machine is accessed to the AFDX, and sufficiently utilizing the residual bandwidth in the AFDX, and effectively improving the bandwidth utilization rate of the AFDX, and is applicable to network and exchange aspects.

The invention discloses an avionics full duplex switched Ethernet (AFDX) protocol switching engine based on shared storage, which comprises a switching port, a shared storage exchange structure, a virtual link configuration table, a management information base (MIB) module, a global counter, a shared cache memory access interface and an exchange terminal interface. The switching engine can be widely used for researching and developing the existing avionics bus of a domestic military/ civil aircraft, and is remarkable in market prospect and economic benefit.

The present invention discloses an Ethernet switching method, including: dividing a communication period of a transmitting component of an Ethernet port into at least two equal transmission time slots that appear regularly; deciding a transmission time slot at the Ethernet port corresponding to the Layer 2/Layer 3 (L2/L3) information of a to-be-switched Ethernet frame of fixed length; switching the to-be-switched Ethernet frame of fixed length into a time-division switch transmission queue maintained by the decided Ethernet port in the decided transmission time slot; and transmitting, by the Ethernet port in a cyclic order, to-be-switched Ethernet frames of fixed length in time-division switch transmission queues maintained in different transmission time slots separately. The present invention also discloses an Ethernet switch. The Ethernet switching scheme provided by the present invention satisfies the transmission delay requirement of time-division services transmitted at constant rate.

A method and apparatus for providing security to factory automation devices in a switched Ethernet network. Traffic between factory automation devices and an Ethernet switch is limited to packets including approved TCP/UDP port numbers and to selected data rates.

The invention discloses a dithering-free transmitting and scheduling method of an aviation full duplex switched Ethernet terminal. In the method, two parameters of period and excursion are put forward on the basis of BAG and Jitter; a time shaft is divided into a plurality of time slots by the two parameters; and then the different time slots are distributed to each virtual link, and when the distribution of the time slots meets the requirement of each virtual link BAG, the conflicts of the plurality of virtual links on the time shaft are avoided. Therefore, each virtual link can transmit a data frame according to the distributed time slots, thereby realizing the dithering-free transmission of the frames.

The invention relates to a communication network for an aircraft. For overcoming the limitation of the bus network architecture of the air craft in the prior, the invention provides a network architecture of centralized management. In one aspect, the invention provides a network for the aircraft, which comprises a core processing subsystem, at least one switching device for communicating with the core processing subsystem, and at least one terminal subsystem for communicating with the at least one switching device. The processing software and management software of the terminal subsystem are integrated in the core processing subsystem; data excgabge between the terminal subsystem and the core processing subsystem is performed by an avionics full duplex switched Ethernet (AFDX) bus; and thus, the sharing of time, processor resources and memory resources is promoted. The terminal subsystems can perform the initial preprocessing of the data of the terminal subsystems and exchange the data through the AFDX bus; therefore, the utilization rate of the network resources is improved, it is convenient to transmit data, and it is simple and convenient to install and maintain the network.

The invention discloses a service flow shaping method and a service flow shaping device for a cascaded port of an avionics full duplex switched Ethernet (AFDX) switch. The main problems of relatively stronger switching delay jitter of packets and incapability of transmitting high-priority packets on time in the prior art are solved, and a system can be conveniently cascaded. The method comprises the following steps of: (1) extracting packet scheduling information; (2) extracting the information of a time registry; (3) receiving and scheduling the packets; (4) selecting and sequencing the packets; (5) updating time tags; (6) transmitting and scheduling the packets; and (7) updating a time registry. The device comprises an input caching module, a receiving scheduling module, a time registry module, a packet information storage area module, a time tag module, an output queue module, a transmission scheduling module and an output caching module. The method and the device have the advantages that: the determinacy of the delay jitter of the packets can be ensured; the forwarding delay jitter of the packets can be effectively reduced; the high-priority packets can be transmitted on time; and the method and the device are applied to the traffic shaping of the AFDX switch.

The invention discloses an airborne collision avoidance and ground proximity warning monitoring system which comprises a set of four-channel L band antennas and a system host machine. The system host machine is formed by a data processing module, an RF module, a baseband module, and a power module. The four-channel L band antennas are connected with the RF module through coaxial cables. The RF module is connected with the data processing module through the baseband module. The system host machine obtains aircraft body state information through the connection of an avionics full duplex switched Ethernet (AFDX) or a self-bring interface unit. The system has the advantages that the most reasonable monitoring and alarm information and avoidance advice are provided for a pilot, the working pressure of a pilot is reduced, an man-made error determination is avoided, and the flying safety of an airplane is increased; the reuse of resources is realized, the weight, volume, power consumption and cost of airplane monitoring equipment are reduced, and the reliability and scalability of the equipment are improved.

The invention relates to a system and method called autotopology of a network or advertising based network management which enables the analysis and automatic graphical and hierarchical representation of any hierarchical or flat network topology, especially a switched Ethernet (SE). The autotopology can be used for self-configured networks (for example by using zeroconf) and for any otherwise configured networks, especially using DHCP or manually configured networks. The use of zeroconf is called autoconfiguration. Autoconfiguration and autotopology enable a comfortable and safe administration of a network. Administration of a self-configured network using the autotopology data proceeds in a separate and low-priority sub-network (link local) so that the productive operation of the network remains undisturbed. The topology of the network is used as a clear possibility of administering a network. Administration of the network is possible immediately after determination of the topology.

The embodiment of the invention discloses a network testing device comprising a data acquisition module, an end system testing module, a switching unit testing module and a monitoring module, wherein the data acquisition module is used for coupling a port of a switching unit and/or a port of an end system in a communication way so as to acquire data from the port; the end system testing module is coupled to the data acquisition module and used for carrying out first test on the data acquired from the port of the end system; the switching unit testing module is coupled to the data acquisition module and used for carrying out second test on the data acquired from the port of the switching unit; and the monitoring module is coupled to the switching unit testing module and the end system testing module in the communication way and used for acquiring and presenting the results of the first test and/or second test. Through the scheme, AFDX (Avionics Full-Duplex Switched Ethernet) network design, configuration, deployment and test monitoring are combined so that the systematicness and the degree of automation for an AFDX network test are improved.

The invention discloses a flow control method and device of an AFDX switch, wherein the method comprises the following steps of: monitoring data link information at an entrance by using the switch to acquire the arrival time of the data link information; judging whether the data link information is valid or not according to the arrival time of the data link information by using the switch; and sending the valid data link information by using the switch. Through the invention, the performance and the capacity of the AFDX network switch can be improved.

The embodiment of the invention provides a method for testing an end system in a network, and the method comprises the following steps: configuring a simulation unit of the end system for correspondingly performing communication with the end system; acquiring end communication data of the end system; testing the end communication data; and acquiring and showing the analysis result of the end communication data through a monitoring module. Through the scheme, the systematic property and degree of automation of AFDX (avionics full duplex switched Ethernet) network testing are improved.

The invention discloses an AFDX (Avionics Full Duplex Switched Ethernet) end-to-end delay bound claculation method based on a random network calculus. The method comprises the following four steps of: firstly, determining a flow chart of a dataflow in an entire network, and drawing out the flow chart of the dataflow; secondly, analyzing a constituent part of an end-to-end delay of the dataflow in the entire network, thereby obtaining a constituent form of a fixed delay and a variable delay of the end-to-end delay; thirdly, calculating the variable delay; and fourthly, obtaining an end-to-end delay bound of the dataflow to be analyzed. According to the invention, influence of the dataflow is taken into consideration in case of a random interference or an emergency, and a greater grain is achieved from statistics of a duplex independent communication flow; meanwhile, influences of high/low priority configuration and a scheduling algorithm on the delay in an exchanger are taken into full consideration, therefore, not only can an end-to-end delay bound value be precisely obtained and unnecessary resource waste can be avoided, but a network performance can be predicated in a design stage, waste is avoided when an actually-built network is unqualified.

The invention discloses a simple simulation testing device for an AFDX (avionics full duplex switched Ethernet) switch. The simple simulation testing device comprises a testing host, and is characterized by also comprising a loopback device; the testing host comprises two testing ports; the loopback device comprises two first ports and N second ports, wherein the two first ports are respectively connected with the testing ports of the testing host, and the N second ports are respectively connected with N switch ports of a tested AFDX switch; the first ports are connected with the second ports in the loopback device according to the connecting number of the first ports and the testing ports, and loopback processing is performed among the remaining second ports; the invention also discloses a testing method for the simple simulation testing device for the AFDX switch. According to the simple simulation testing device and the testing method thereof disclosed by the invention, the weight and the size of a testing cable are greatly reduced, and the space requirements of environmental testing sites, environmental testing equipment and the like can be met very well.

The method comprises: setting a group-discarded mode for each multicast group in the Ethernet; under said group-discarded mode, creating a multicast forwarding table for each multicast node; adding the ring-network port of each node into the multicast forwarding table of the node; the ring-network ports of all nodes forms a multicast path of Ethernet; while the users or links in the Ethernet vary, the multicast link is switched at the node relating to the variation. The invention introduces a group-discarded mode under which the multicast table of each node in Ethernet always exists such that when needing to make link switch, the multicast forwarding table doesn't need to be made any more and the notice to main node is also not to be required so as to reduce the delay of switching the multicast links.

The invention provides a self-adaptive switching Ethernet cross redundancy backup system and method. The self-adaptive switching Ethernet cross redundancy backup system comprises a main circuit and abackup circuit which are provided with independent supply power, the main circuit and the backup circuit respectively comprise a redundancy control module. The main circuit further comprises an optical fiber physical channel M_A and an optical fiber physical channel M_B; the backup circuit further comprises an optical fiber physical channel S_A and an optical fiber physical channel S_B; the optical fiber physical channel M_A and the optical fiber physical channel S_A are both connected with the network switch main part, and the optical fiber physical channel M_B and the optical fiber physicalchannel S_B are both in backup connection with the network switch; and the redundancy control module is used for realizing self-adaptive switching of each optical fiber physical channel. The reliability of an interface circuit and topology is improved, and the method is suitable for high-reliability application fields such as space navigation; according to the invention, self-adaptive switching can be carried out when the link goes wrong, the real-time performance, the flexibility and the effectiveness of switching are improved, and the loss of a large amount of data caused by link interruption in the switching process is avoided.