69results about How to "Reliable data communication" patented technology

A communication system includes a first wireless communication device disposed onboard a vehicle system having two or more propulsion-generating vehicles that are mechanically interconnected with each other. The communication system also includes a controller configured to be disposed onboard the vehicle system and operatively connected with the first wireless communication device in order to control operations of the device. The controller is configured to direct the first wireless communication device to switch between operating in an off-board communication mode and an onboard communication mode. When the first wireless communication device is operating in the off-board communication mode, the device is configured to receive remote data signals from a location that is disposed off-board of the vehicle system. When the first wireless communication device is operating in the onboard communication mode, the device is configured to communicate local data signals between the propulsion-generating vehicles of the vehicle system.

An external transmitter circuit drives an implantable neural stimulator having an implanted coil from a primary coil driven by a power amplifier. For efficient power consumption, the transmitter output circuit (which includes the primary coil driven by the power amplifier inductively coupled with the implanted coil) operates as a tuned resonant circuit. When operating as a tuned resonant circuit, it is difficult to modulate the carrier signal with data having sharp rise and fall times without using a high power modulation amplifier. Sharp rise and fall times are needed in order to ensure reliable data transmission. To overcome this difficulty, the present invention includes an output switch that selectively inserts a resistor in the transmitter output coil circuit in order to de-tune the resonant circuit only during those times when data modulation is needed. Such de-tuning allows sharp rise and fall times in the data modulation without the need for using a high power modulation amplifier. Because data modulation is typically needed for only a small percent of the time that a carrier signal is present, it is thus possible using the present invention to achieve reliable data modulation, transmission and reception without having to use a high power modulation amplifier in the transmitter.

Communication and Process Migration Protocols instituted in an independent layer of a virtual machine environment allow for heterogeneous or homogeneous process migration. The protocols manage message traffic for processes communicating in the virtual machine environment. The protocols manage message traffic for migrating processes so that no message traffic is lost during migration, and proper message order is maintained for the migrating process. In addition to correctness of migration operations, low overhead and high efficiency is achieved for supporting scalable, point-to-point communications.

An improved tractor-trailer communications and tracking system retrofitting assembly, comprising an insulated wire, a flexible wire sleeve, a sealed fuse box, a male connector and a female connector is disclosed. The insulated wire has a length sufficient to at least span the distance between the rear portion of a tractor cab or sleeper box and the power line carrier filter. A first end of the insulated wire terminates in first and second wire segments of roughly equal length. The end portion of the first wire segment has a two-way female connector electrically attached thereto and the second wire segment has a two-way male connector electrically attached thereto. A third wire segment is electrically attached to the female two-way connector at a first end and to the male two-way connector at a second end.

The invention discloses an SSL-based method and system for establishing communication. The method comprises the steps that firstly a client and load balancing equipment are made to mutually shake hands in the SSL and then authenticate each other, and after authentication, the client establishes communication with the load balancing equipment. The method and system have the advantages that the SSL protocol is adopted to provide reliable and quick data communication for a client side and a server side; besides, the operation efficiency of the SSL is improved by designing a combined public key, the length of cryptographic keys under the same intensity is reduced, and the flexibility and the availability of a network are improved.

The present disclosure is directed generally to systems and methods for dynamically selecting a retransmission rate for communication between two devices. The retransmission rate may be selected after a transmission has failed between the devices. In some embodiments, the retransmission rate may be selected based on relative velocity of the devices. In some embodiments, the retransmission rate may be selected based on transmission channel characteristics. The retransmission rate may be selected such that the retransmission will be less than an allowable transmission rate based on a distance between the two devices.

The invention relates to a UDP-based reliable transmission method. It is a reliable transmission protocol on a UDP layer; the reliable transmission protocol comprises reliable transmission, unreliable transmission and out-of-order transmission; the reliable transmission is used for providing reliable data transmission between two upper applications; received data messages need to be confirmed; lost data messages need to be retransmitted; the received data messages are submitted to the upper applications according to the message reliable serial number sequence; unreliable transmission is used for providing unreliable data transmission between the two upper applications; the received data messages do not need to be confirmed; the lost data messages do not need to be retransmitted; the received data messages are submitted to the upper applications according to the message unreliable serial number sequence; the out-of-order transmission is used for providing out-of-order data transmission between the two upper applications; the received data messages do not need to be confirmed; the lost data messages do not need to be retransmitted; and the received data messages are submitted to the upper applications directly according to the receiving sequence. The UDP-based reliable transmission method disclosed by the invention is good in reliability.

The PC card of the present invention preferably includes a logic circuit operating in either a 16-bit mode or a 32-bit mode, a ground line on the circuit, a connector for transferring a signal between the circuit and the external device, and a series of elastic metal members arranged on the top surface of the connector and connected to the ground line. When the connector of the PC card is inserted into the PC card slot, the elastic metal member is retained by a support frame arranged on the periphery of the PC card slot, and is deformed upward toward the top surface of the connector. When the PC card is fully inserted into the slot, the elastic metal member urges the support frame and both are firmly connected.

The invention relates to a data transmission method, a device and a system used in an optical access network. The method comprises the following steps that: when detecting that optical line terminal equipment breaks down, the optical line terminal equipment acquires information required for master-slave switching; and the acquired information is packaged into an access node control protocol message and is sent to a destination optical line terminal of master-slave switching directly or through an access node control protocol server so as to protect data transmission. The embodiment of the invention realizes quick and reliable data communication between a master optical line terminal (OLT) and a slave optical line terminal (OLT) and quickly realizes switching between the master optical line terminal (OLT) and the slave optical line terminal (OLT) when the master optical line terminal (OLT) and the slave optical line terminal (OLT) are required to be switched.

The invention relates to an integrated control system for power grid dispatching. Compared with the prior art, the system achieves the integration of the main and standby systems mainly through threelayers, and achieves the integration of resource layers through active-active storage. The system provides active-active access, zero data loss, and sharing and storage, achieves the unified management of various types of magnetic disk arrays, and achieves the resource pooling of different types of disk arrays at a data center. A network layer executes the high-performance and high-reliability data communication of main and standby equipment through a bare optical fiber and a wavelength division interconnection link. The system achieves the integration of a computer layer through a database, achieves the high usability, load balance and migration dispatching through a database module, guarantees the real-time synchronization of data between two stations, and achieves the business integrityin an operation process.

The invention relates to a data communication method and device, a computer terminal and a computer readable storage medium. According to the data communication method, a current node sends a data query instruction to a gateway and all remaining nodes in a local area network in a data broadcasting mode, so that the remaining nodes receiving the data query instruction enter a timing waiting state;the current node judges whether a query confirmation instruction returned by the gateway is received within a preset timing time; if so, the current node judges that the channel is in an idle state and sends the target data to the gateway, wherein the target data comprises identity identification information corresponding to the gateway; when target data transmission is completed, the current nodesends a transmission ending instruction to the gateway in the local area network and all the remaining nodes in the data broadcasting mode again so as to enable the remaining nodes receiving the transmission ending instruction to quit the timing waiting state. The exclusiveness of the channel is declared to other remaining nodes by broadcasting the query command before the data is sent, so that the communication efficiency and quality are improved.

A semiconductor device includes: a plurality of external signal input means; an external input unit having a switch each connected between the external signal input means and a read line and electrically connected for output from the external signal input means on the read line; a shift register receiving an external control signal and an external clock signal and synchronized with the external clock signal to shift successively the external control signal to provide shifted data and output the external control signal to electrically connect the switches in accordance with the shifted data; an output circuit receiving the external control signal from the shift register and externally outputting the external control signal; and a frequency divider circuit dividing the external clock signal in frequency to generate and output an internal clock signal, wherein the output circuit is synchronized with the internal clock signal to externally output the external control signal.

A wireless communication system includes a wireless communication apparatus (fixed terminal) resided in a fixed station side providing a wireless antenna, a wireless communication unit, a server processing unit, a task list, a data communication unit, a buffer management unit and a buffer, and a wireless data transport apparatus (mobile terminal) resided in a mobile station side providing the wireless antenna, the wireless communication unit, a server determination unit, a task list I / O unit, the task list, a client processing unit and the buffer, thereby, the mobile terminal receives the task list from the fixed terminal to communicate data with another fixed terminal and transports not only the data but also a data acknowledgement, and the fixed terminal creates the acknowledgement to use the acknowledgement to thereby control a creation and deletion of bulk data appropriately.

The invention relates to an outdoor 27.5 kV fixedly-sealed type vacuum modularized electric appliance for an electrified railway, which comprises a supporting frame and a monopole fixedly-sealed type vacuum circuit breaker arranged on the supporting frame, wherein the monopole fixedly-sealed type vacuum circuit breaker is arranged in the middle part of the supporting frame, and an incoming line connecting terminal and an outgoing line connecting terminal are positioned on two sides of the supporting frame respectively; the outgoing line connecting terminal is positioned on a first fixedly-sealed supporting column type transformer, a moving contact of a first isolating switch is positioned on a supporting seat of the first fixedly-sealed supporting column type transformer, a current transformer is arranged between the first isolating switch and the circuit breaker, a fixed contact of the first isolating switch is positioned on the current transformer, and the current transformer is connected with the monopole fixedly-sealed type vacuum circuit breaker; and the incoming line connecting terminal is positioned on a second fixedly-sealed supporting column type transformer, a moving contact of a second isolating switch is positioned on the second fixedly-sealed supporting column type transformer, and a fixed contact of the second isolating switch is positioned on a fixedly-sealed terminal of the circuit breaker. The outdoor 27.5 kV fixedly-sealed type vacuum modularized electric appliance for the electrified railway effectively reduces the floor area and the investment cost, and has good reliability, convenient maintenance and good product reliability.

The invention discloses a selection method and apparatus for a switching node, and a base node and terminal nodes. According to the selection method, the coverage regions and the overlapping regions of the multiple terminal nodes, and link costs and hierarchy information between the terminal nodes and the base node are detected and weighted; and a second terminal node with the maximum weight is chosen from the multiple terminal nodes to be upgraded into the switching node. Therefore, the switching node can be used for forwarding information conveniently to enable the base node and the terminal nodes or the nodes without network access to establish connection; consequently, unsmooth communication caused by interference can be avoided when base node transmits message to the long-distanced terminal nodes or the nodes without network access, the communication quality is improved, the load of the base node is lowered, and the network flow is saved; and stable and reliable data communication between an electric meter far from a concentrator and the concentrator can be realized.

A transmitter and a receiver for transmitting and receiving data via a power supply line comprise a local signal port for respectively receiving and transmitting a serial bit stream and a power line connection port for respectively transmitting a radio frequency signal and receiving the radio frequency signal via the power supply line. The transmitter comprises a modulator unit adapted for encoding the serial bit stream into a baseband signal and generating the radio frequency signal by mixing the baseband signal with a carrier wave so as to redundantly convey the at least one baseband signal in at least four spectral sidebands of the carrier wave. The receiver comprises a demodulator unit adapted for detecting the at least four spectral sidebands of the carrier wave in the radio frequency signal, isolating a baseband signal from the at least four spectral sidebands and decoding the baseband signal into the serial bit stream.

An outdoor 2 multiply 27.5 kV solid-sealing vacuum modular device of electrified railway includes brackets, two connection branches mounted on the brackets that are parallel and independent to each other and an integrated automation control box, a bipolar solid-sealing disjunctor is mounted onto middle part of the brackets, an outgoing line connection terminal is located on a first solid-sealing strut type transformer, moving contact of a first bipolar disconnector is located on bracket of the first solid-sealing strut type transformer, between the first bipolar disconnector and the disjunctor is provided with current transformer, stationary contact of the first bipolar disconnector is located on the current transformer which is connected with a single polar solid-sealing disjunctor; an incoming line connection terminal is located on a second solid-sealing strut type transformer, moving contact of a second bipolar disconnector is located on the second solid-sealing strut type transformer, stationary contact of the second bipolar disconnector is located on a solie-sealing polar of the disjunctor. The invention can reduce floor space efficiently and capitalized cost, and has good reliability and good prosucts reliability, which is convenient to maintain.

The invention discloses an optimization system and method for a country biogas data collection wireless network. The system comprises wireless terminals, wireless base stations, a wireless gateway anda management backend; the wireless terminals are responsible for collecting usages of natural gas meters; the wireless base stations are responsible for data transmission between the wireless terminals and the management backend; the wireless gateway concentrates data of each of the wireless natural gas meters as well as own information of the wireless terminals, the wireless base stations and relays, and transmits to the management backend for summarizing and data processing; and the management backend performs operation, storage, data analysis, display and control on data of the whole system. According to the optimization system and method, the coverage of an autonomous wireless network is implemented and does not need to be through an operator network, and the defects of use of an operator network in a country area are avoided; the wireless network cost does not need to be paid to an operator; through multi-stage wireless network optimization, the best network coverage is implemented, and the reliable data communication is guaranteed; and the extension of the wireless network can be flexibly implemented so as to cover a wider area.

A portable computer with infrared data communication capabilities is disclosed. The computer has an infrared transceiver capable of enlarging the data sending / receiving angle and reliably performing radio data communication with another electronic appliance. The computer also has a selection circuit capable of activating all light elements during a data sending operation or selecting one active light receiving element from a plurality of light receiving elements during a data receiving operation, thus performing a reliable infrared data communication. In the computer, an opening is formed on an outside edge of the display body. Both an infrared data sending unit, consisting of at least one light element, and an infrared data receiving unit, consisting of at least one light receiving element, are commonly carried on a circuit board set in the opening of the display body.

The invention discloses a method for interaction between a wireless communication module and a sensor in the field of power Internet of Things. A software control interface is included. According to the invention, a synchronous communication protocol Power Transmission and Transformation Equipment Internet-of-Things Node Equipment Wireless Networking Protocol and an asynchronous communication protocol Power Transmission and Transformation Equipment Internet-of-Things Micropower Wireless Network Communication Protocol are supported at the same time, an electric power Internet-of-Things communication standard is covered in an omnibearing manner, asynchronous / synchronous communication requirements are satisfied at the same time, fragmented acknowledgement (ACK) frames are supported, and reliable data communication is supported. Error data in wireless communication generated by factors such as electromagnetic interference in an electric power Internet-of-Things environment is avoided, a BUSY pin and an SYN pin are provided, a method is provided for state exchange between a sensor and a communication module, external interruption is conveniently received by the sensor in a pin level change mode, data is quickly sent, state switching is facilitated, the sleep process provides a low-power-consumption sleep method for the sensor and the communication module, and the power consumption is effectively reduced.

The invention discloses a tower crane lifting dead-slow control system and a tower crane lifting dead-slow control method. The tower crane lifting dead-slow control system comprises a control device;the control device is connected with a display device for providing a human-machine interaction interface and displaying information such as a tower crane working mode, an operation parameter, parameter setting and alarm; a lifting variable-frequency driving system for executing a control device lifting command is connected; dead-slow control and millimeter precision can be achieved through the steps of mode selection, lifting signal generation and lifting execution; the working condition of high-precision lifting requirement can be met; itching control is not limited by the level of an operator, so that misoperation is effectively avoided and safety and reliability are achieved; various dead-slow control distances can be selected, so that different lifting precision requirements can be met; and the human-machine interaction interface is convenient and dead-slow control selection can be realized through one key.

The invention discloses a power control system of an intelligent electric motorcycle. The power control system comprises a battery, a BMS module, a charging module, a motor, a motor control module, aninput module, a wireless control module and a meter; and the BMS module is used for controlling charging and discharging of the battery, the motor control module is electrically connected to the motor to control the motor, the input module is electrically connected to the motor control module and used for user operation to control the motor, the wireless control module is used for enabling the intelligent electric motorcycle to carry out wireless information interaction with the user terminal, the BMS module, the charging module, the motor control module, and the wireless control module and the meter are connected to the CAN bus for data communication through the CAN bus. The power control system has the beneficial effects that real-time and reliable data communication between the BMS module, the charging module, the motor control module, the wireless control module and the meter is realized through the CAN bus communication technology.