62 results about "Linear topology" patented technology

A system for controlling packet forwarding through a dual-homed connection between first and second network domains, the dual-homed connection including two peer nodes connected to the first and second network domains. A sub-ring network is instantiated in the first network domain, and includes at least two nodes connected in a linear topology between a pair of end-nodes. Each end-node corresponds with a respective one of the peer nodes. A virtual link through the second network domain for conveys traffic of the sub-ring network between the peer nodes, and closes the sub-ring network to define a ring topology. Each of the nodes of the sub-ring network is controlled to forward packets of the sub-ring network in accordance with a ring network routing scheme.

Systems and methods for performing distributed virtual network embedding are disclosed. A resource orchestrator may receive a virtual network request specifying a set of virtual nodes, a set of virtual links, each connecting two virtual nodes in a mesh topology, and resource requirements for some virtual nodes. The orchestrator may partition the virtual network request into multiple sub-requests, each specifying a linear topology for a subset of the virtual nodes and links within the mesh topology. The sub-requests may collectively include all virtual links within the mesh topology with no overlapping links. Resource orchestrators may collaborate to compute, independently for each sub-request, a respective chaining solution in which each virtual node is mapped to a physical node having resources sufficient to implementing the virtual node. A resource orchestrator may combine the respective chaining solutions for each of the sub-requests to generate a mapping solution for the virtual network request.

A local network, particularly an Ethernet network having redundancy properties, in which coupling devices (K1, K2, K3) and a redundancy manager (RM) are interconnected in a ring-shaped topology. The redundancy manager opens the ring to create a linear topology if test messages (T11, T12) emitted by the redundancy manager (RM) are received at the other port (P42, P41) within a given period of time, otherwise the redundancy manager (RM) closes the connection. As a so-called redundancy manager observer, at least one of the coupling devices (K3) is configured such that it evaluates messages received at the port (P32) thereof, the port (P32) being connected to the redundancy manager, opens the ring to create a linear topology, and signals an error if more than initial test messages (T11) have been received at this port (P32) and if the status “ring opened” has been indicated by the redundancy manager (RM) in the last-received initial test message (T11), whereby messages are prevented from circulating on the ring.

The invention provides a constant-current driving circuit for an LED switch. The constant-current driving circuit for the LED switch at least comprises a voltage input module, an LED module, a power tube, a filter, an error amplifier, a pulse width modulation circuit, a current limiting circuit, a control circuit and a driving circuit, wherein the LED module is connected with the voltage input module; the power tube is connected with the LED module; constant current can be achieved by adjusting the duty cycle of the power tube; the filter is connected with the output end of the power tube and is used for filtering sampling voltage; the error amplifier is used for comparing the sampling voltage with reference voltage; the pulse width modulation circuit is used for generating a PWM signal; the current limiting circuit is used for adjusting the amplitude of the PWM signal; the control circuit and the driving circuit are used for adjusting and driving the gate voltage of the power tube. According to the constant-current circuit for the LED switch, the constant current of the LED can be achieved by adopting a switching topology and linear topology combined novel topology structure, no inductor or electrolytic capacitor is needed, the power tube is controlled in a switch mode, and the efficiency is higher than that of a pure linear control structure.

The invention relates to a network, in particular a PA PROFIBUS network having redundant properties and a linear topology. Two line ends are connected to a redundancy manager which disconnects said line ends in error-free conditions and connects them in error conditions. Said redundancy manager supplies voltage to the first line end for operating customers' mobile telephones each of which is connected to the network by a branching unit. After receiving a supply voltage on one connection thereof, said branching units check the state of a cable which is connected to the other network connection and transmit the supply voltage in the faultless condition thereof only. When the redundancy manager does not detect the supply voltage on the other end of the line end at least during a predetermined space of time after voltage supply, said redundancy manager supplies the voltage thereto. A cable having a disturbance is then disconnected from the line by the adjacent branching units.

The present disclosure relates to methods and apparatuses for reducing propagation delay uncertainty while conducting a survey. The apparatus includes a plurality of nodes along a communication path configured to allow communication between nodes with only one clock domain boundary crossing. Each node may include a clock, a memory, and a processor. The plurality of nodes is arranged in a linear topology. The linear topology may have first and second nodes on the ends of the line. The method may include reducing propagation delay uncertainty using at least one time marker transmitted to each of the plurality of nodes without crossing a clock domain boundary of any other node.

A local network, particularly an Ethernet network having redundancy properties, in which coupling devices (K1, K2, K3) and a redundancy manager (RM) are interconnected in a ring-shaped topology. The redundancy manager opens the ring to create a linear topology if test messages (T11, T12) emitted by the redundancy manager (RM) are received at the other port (P42, P41) within a given period of time, otherwise the redundancy manager (RM) closes the connection. As a so-called redundancy manager observer, at least one of the coupling devices (K3) is configured such that it evaluates messages received at the port (P32) thereof, the port (P32) being connected to the redundancy manager, opens the ring to create a linear topology, and signals an error if more than initial test messages (T11) have been received at this port (P32) and if the status “ring opened” has been indicated by the redundancy manager (RM) in the last-received initial test message (T11), whereby messages are prevented from circulating on the ring.

The present invention relates to wireless network technologies, and particularly to a chain-type wireless sensor network-oriented hybrid media access control (MAC) method. The present invention fully considers features of a chained or linear topology of a wireless sensor network applied in power transmission line monitoring and the like, adopts different access policies at different periods of the network, and proposes a method of time division access control Pipelined TDMA during busy periods and contention access control S-XMAC during idle periods. During busy periods, a pipelined scheduling transmission method is used to avoid the problem of hidden terminals so as to improve transmission reliability and resource utilization. During idle periods, different MAC parameters are set for cluster head members and ordinary cluster members, so that the cluster head members can respond to requests in a more timely manner, and meanwhile, the ordinary cluster members save energy as much as possible, thereby meeting requirements for network real-time quality of the application system while saving energy of the network.

A method for scheduling single-arm multi-cluster tools is provided. The present invention studies the scheduling problem of a single-arm multi-cluster tool with a linear topology and process-bound bottleneck individual tool. Its objective is to find a one-wafer cyclic schedule such that the lower bound of cycle time is reached by optimally configuring spaces in buffering modules that link individual cluster tools. A Petri net model is developed to describe the dynamic behavior of the system by extending resource-oriented Petri nets such that a schedule can be parameterized by robots' waiting time. Based on this model, conditions are presented under which a one-wafer cyclic schedule with lower bound of cycle time can be found. With the derived conditions, an algorithm is presented to find such a schedule and optimally configure the buffer spaces.

The invention provides a method for scheduling single-arm multi-cluster tools. The present invention studies the scheduling problem of a single-arm multi-cluster tool with a linear topology and process-bound bottleneck individual tool. Its objective is to find a one-wafer cyclic schedule such that the lower bound of cycle time is reached by optimally configuring spaces in buffering modules that link individual cluster tools. A Petri net model is developed to describe the dynamic behavior of the system by extending resource-oriented Petri nets such that a schedule can be parameterized by robots' waiting time. Based on this model, conditions are presented under which a one-wafer cyclic schedule with lower bound of cycle time can be found. With the derived conditions, an algorithm is presented to find such a schedule and optimally configure the buffer spaces.

The invention relates to an information transmission network used in traffic information system. Wherein, it uses the cable along road, uses inactive optical network technique, accesses into real-time traffic informant on road, and supplies relative Qos assurance; based on the topology character of road, changing the optical distribution network into point-to-multipoint bus structure, building traffic information transmission network; the network in inactive optical network, at each OLT / ONU, it has initial network manage ability; the traffic information collected by OLT can be accessed into traffic information special network, at the junction of system, to be managed and processed.

The invention relates to a local network, particularly an Ethernet network having redundancy properties, in which coupling devices (K1, K2, K3) and a redundancy manager (RM) are interconnected in a ring-shaped topology. The redundancy manager opens the ring to create a linear topology if test messages (T11, T12) emitted by said redundancy manager (RM) are received at the other port (P42, P41) within a given period of time, otherwise the redundancy manager (RM) closes the connection. As a so-called redundancy manager observer, at least one of the coupling devices (K3) is configured such that it evaluates messages received at the port (P32) thereof, said port (P32) being connected to the redundancy manager, opens the ring to create a linear topology, and signals an error if more than initial test messages (T11) have been received at said port (P32) and if the status ring opened has been indicated by the redundancy manager (RM) in the last-received initial test message (T11), whereby messages are prevented from circulating on the ring.

A communication system and method includes a main bus that operates in accordance with a standard limited to a linear topology, a bus controller coupled to the main bus and configured to send and receive messages on the main bus, and a first remote terminal coupled to the main bus and configured to send and receive messages on the main bus including the messages sent by the bus controller. The system and method also includes a repeater coupled to the main bus and configured to send and receive messages on the main bus including the messages sent by the bus controller and by the first remote terminal, and second and third remote terminals coupled to the repeater, wherein the second and third remote terminals send and receive messages on the main bus via the repeater.

The invention discloses a networking method for a wireless ad hoc network of a linear topological structure. The network method for the wireless ad hoc network is mainly formed by a root node and a plurality of routing nodes; the networking method for the wireless ad hoc network of the linear topological structure can take the root node as an initial layer node, one node is arranged on each layer,and the nodes are cascaded layer by layer, so that the network coverage of a long distance is achieved, and the number of nodes is not limited theoretically. The problems of small coverage range, short transmission distance and limited number of network nodes of other ad hoc networks can be well solved; the network address distribution is simple, and the networking is convenient; the wireless adhoc network of the linear topology structure is provided with one root node and the rest of routing nodes, each routing node can only mount one child node, two data transmission paths of the wirelessnetwork are provided, wherein one data transmission path is from the root node to a destination node via the routing nodes and the other data transmission path is from the destination node to the rootnode via the routing nodes; and the method is suitable for a scene that the root node serves as a gateway, and data reading and operation control of each node are achieved.

A communication system and method includes a main bus that operates in accordance with a standard limited to a linear topology, a bus controller coupled to the main bus and configured to send and receive messages on the main bus, and a first remote terminal coupled to the main bus and configured to send and receive messages on the main bus including the messages sent by the bus controller. The system and method also includes a repeater coupled to the main bus and configured to send and receive messages on the main bus including the messages sent by the bus controller and by the first remote terminal, and second and third remote terminals coupled to the repeater, wherein the second and third remote terminals send and receive messages on the main bus via the repeater.

Methods, systems, and computer program products for automatically determining locations of interconnected processing modules are disclosed. Physical identifiers are determined for each of a plurality of processing modules connected to each other in a linear topology. Communications are iteratively disabled with each of the processing modules. Discover messages are sent to active, reachable processing modules and responses are received from the active processing modules that receive the discover messages. Based on the number of responses, the location of each processing module is determined.

A system for controlling packet forwarding through a dual-homed connection between first and second network domains, the dual-homed connection including two peer nodes connected to the first and second network domains. A sub-ring network is instantiated in the first network domain, and includes at least two nodes connected in a linear topology between a pair of end-nodes. Each end-node corresponds with a respective one of the peer nodes. A virtual link through the second network domain for conveys traffic of the sub-ring network between the peer nodes, and closes the sub-ring network to define a ring topology. Each of the nodes of the sub-ring network is controlled to forward packets of the sub-ring network in accordance with a ring network routing scheme.

A redundantly operable industrial communication system having a plurality of communication devices redundantly linked to an industrial communication network within a ring or tree topology, and a plurality of communication devices inter connected within a linear topology, wherein a communication device configured as a ring portion redundancy manager within the linear topology comprises a monitoring and control unit that detects an interruption within the linear topology using transmitted test messages and controls forwarding of messages containing useful data between two ports, associated with the linear topology, of the communication device configured as a ring portion redundancy manager when an interruption is detected, and first and second communication devices return test messages received within the linear topology to the communication device configured as a ring portion redundancy manager or send test messages to the communication device configured as the ring portion redundancy manager.

The invention relates to a routing method for a linear topology wireless ad hoc network, and belongs to the technical field of wireless communication network routing. The method comprises the following steps of generating a static topological structure relation table between wireless nodes in each wireless node of a network; in the network operation process, enabling each wireless node to generatea dynamic wireless node and wireless terminal association table based on the real-time state and dynamically maintain the association table; after receiving the information that a wireless communication data packet needing to be forwarded, enabling each wireless node to calculate and forward the shortest routing path to a target wireless terminal according to the shortest routing path of the target wireless terminal in a local routing table; and when the target wireless terminal moves and is associated with a new wireless node or the link between the wireless nodes is interrupted and the liketo influence the effectiveness of the shortest routing path, deleting the corresponding record in the local routing table, and adding the record in the local routing table. The method has the advantages of being low in network load, high in routing efficiency and low in hardware performance requirement, and being easy to implement.

The invention provides a network topology acquisition method and device based on a software-defined network (SDN), which is applicable to an SDN controller. The method comprises the following steps: acquiring linear topologies and / or ring topologies among SDN switches in the SDN; and carrying out superposition of the linear topologies and / or the ring topologies to obtain an overall topology of the SDN. The method and device provided by the invention has the advantages that the problem of low efficiency in direct acquisition of a topological structure of a complicated network in the prior art is solved, the discovery speed for a complicated network topology is improved, an overall view of a complicated network structure can be acquired in a more real-time manner, and the network topology can be more flexibly acquired.

The invention relates to a high efficiency linear topology structure LED (Light Emitting Diode) driving circuit. The high efficiency linear topology structure LED driving circuit comprises a rectifier bridge, a linear IC (Integrated Circuit) regulator for controlling constant output, and a main lamp string, wherein an intelligent switch regulating circuit for optimizing the constant output is connected between the linear IC regulator and the main lamp string; the SW (Southwestern) end of the intelligent switch regulating circuit is connected with the GND (Ground) end of the linear IC regulator; the GND end of the intelligent switch regulating circuit is connected with the main lamp string; the intelligent switch regulating circuit consists of one or more serially connected intelligent switch regulators; each intelligent switch regulator comprises a switch for controlling the opening and closing by threshold voltage; the input end of the switch is the SW end, and the output end of the switch is the GND end; a power resistor or an LED lamp string is connected between the SW end of each intelligent switch regulator and the GND end of each intelligent switch regulator. The high efficiency linear topology structure LED driving circuit has the beneficial effect that the range of input voltage is widened, so that the efficiency and the power factor of the system become higher.

The invention provides a wireless transmission node, a control method thereof and a wireless ad hoc network transmission system, and relates to the field of wireless communication. The wireless transmission node provided by the invention has a bidirectional linear routing rule set, so that the quality of communication links between the wireless transmission node and boundary wireless controllers on two sides can be determined; in addition, according to the method, one end with higher quality is selected as the communication link of the main route, and the communication link of the standby route can be automatically switched to after the quality of the communication link with the main route fails to be reduced to the preset threshold value, so that the data transmission reliability and efficiency of the nodes in the network are improved. Meanwhile, the wireless ad hoc network transmission system is constructed on the basis of an upper computer, at least two boundary wireless controllers and the wireless transmission nodes, and is provided with double communication home nodes, so that bidirectional strategy selection of routing, networking, network maintenance, and network faults and the like is realized, hops experienced by original tail end nodes are reduced; therefore, the data transmission reliability and efficiency of the linear topology wireless ad hoc network are obviously improved.

The invention relates to a porous plate etalon for a multi-sensor measurement system. The etalon includes a plate body, the plate body is provided with an A-type vertical measuring hole and a B-type transverse measuring hole distributed according to the respective linear topology structures, and each of the A-type vertical measuring hole and the B-type transverse measuring hole is composed of a conical hole and a circular hole that are coaxial. The invention further relates to a combined error detection method including numbering the measuring holes in the etalon through the adoption of a 12-hole etalon; measuring the actual values including the diameter of the circular holes by means of a high-precision coordinate measuring instrument; sampling each measuring holes according to the shortest sampling path by each sensor in the multi-sensor measurement system; and calculating the circle center coordinates of the circular hole in each measuring hole and the diameter measurement value of the circular hole, respectively calculating each type of combined error, and determining whether each combined error is qualified or not. According to the invention, the demand of the combined error detection of the multi-sensor measurement system including the optical, image, and contact sensors at the same time can be met.

A device is configured to be operable in a plurality of network environments. A number of different configurations are available to be set on the device, where a first configuration enables operation on a first network, and a second configuration enables operation on a second, disparate, network. A plurality of external ports in conjunction with a multiplexer switch, network switch, internal CPU, external CPU, routing links, etc., can be combined to facilitate multiple configurations for the device. The device is suitable for incorporation into a human machine interface, for application in an industrial processing operation. Receive port information can be incorporated into a data frame to facilitate identification of an external port associated with the reception of the data frame. Applicable networks include linear topology, ring topology, star topology, Ethernet, ROCKWELL NEO, EtherNet / IP, one or more LANs, etc. Configuration can be via a USB device or an interface.

Systems and methods for multiple input instrumentation buses are disclosed. In one embodiment, a bus assembly includes a control module adapted to be coupled to a network, and a plurality of nodes operatively coupled in a linear topology. A plurality of interface modules are coupled to the nodes. At least one node is adapted to receive a primary response signal from the correspondingly coupled interface module, and a secondary response signal from at least one other node, and to determine which of the primary and secondary response signals arrived first, and to output a corresponding one of the primary and secondary response signals that arrived first.

The invention relates to a network, in particular to a PA PROFIBUS network having redundant properties and a linear topology. Two line ends (E1, E2) are connected to a redundancy manager (RM) which disconnects said line ends (E1, E2) in error-free conditions and connects them in error conditions. Said redundancy manager (RM) supplies voltage to the first line end (E1) for operating customers' mobile telephones (Fi-F4) each of which is connected to the network (11) by a branching unit (T1-T4). After receiving a supply voltage on one connection thereof, said branching units (T1-T4) check the state of a cable (H1-H5) which is connected to the other network connection and transmit the supply voltage in the faultless condition thereof only. When the redundancy manager (RM) does not detect the supply voltage on the other end of the line end (E2) at least during a predetermined space of time after voltage supply, said redundancy manager supplies the voltage thereto. A cable (H2) having a disturbance (12) is then disconnected from the line by the adjacent branching units (T1-T3).

A wireless device for selecting a connection target based on signal quality, a system and a method thereof are provided. The invention selects a candidate device having the best signal quality and duration of the signal quality is not less than a threshold reaching a certain time. If the selected candidate device also selects the wireless device, a unique connection is established between the wireless device and the candidate device. In a dynamical and complicated environment, the disclosed system and the method can build up a stable linear topology through automatic negotiation among wireless devices. The invention then achieves the effect of updating topology in time to adapt to environment changes.