1212results about How to "Will not affect normal work" patented technology

The invention discloses a threat detection and defense device, system and method for an industrial control system. The threat detection and defense device, system and method is used for protecting safety of the industrial control system. The threat detection and defense device comprises a threat detection module and an exception handling module, wherein the threat detection module is used for intercepting and capturing a communication data message, identifying message field information in the communication data message, judging whether the communication data message is the malicious message according to the message field information, judging whether malicious act against a local upper computer or malicious act initiated by the local upper computer exists according to the message field information and message field information in a communication massage recorded in a local communication log database and detecting whether malicious operation against a control program in the local upper computer exists; the exception handling module is used for triggering and performing corresponding safety operation according to safety configuration files if one or more of the malicious message, the malicious act against the local upper computer, the malicious act initiated by the local upper computer and the malicious operation against the control program in the local upper computer exist.

The invention relates to a networking method of a wireless electricity consumption information acquisition ad hoc network. According to the technical scheme, the networking method of the wireless electricity consumption information acquisition ad hoc network includes the steps that first, the network is established; second, child nodes without access to the network search for a network center coordinator or child nodes with access to the network; third, the child nodes without access to the network which are searching for the network select the network center coordinator or the child nodes with access to the network as ancestor nodes and send network access requests to the ancestor nodes; fourth, after the ancestor nodes receive the network access requests, network access addresses are allocated to the child nodes applying for access to the network; fifth, the child nodes applying for access to the network send the network access addresses and fixed addresses to the network center coordinator; sixth, if the network center coordinator agrees with that the child nodes applying for access to the network have access to the network, the child nodes applying for access to the network successfully get access to the network, if the network center coordinator does not agree with that, reject information is returned to the child nodes applying for access to the network, and after receiving the information, the child nodes applying for access to the network execute the second step to the sixth step till successfully getting access to the network. The networking method of the wireless electricity consumption information acquisition ad hoc network is used in the field of wireless acquisition of electricity consumption information.

The invention relates to a shift register and a grid line drive device thereof. The shift register comprises a first thin film transistor, a second thin film transistor, a third thin film transistor, a fourth thin film transistor, a first capacitor, a discharge module and a compensation module. A gird of the first thin film transistor is connected with a first node, a source electrode of the first thin film transistor is connected with a clock signal end, and a drain electrode of the first thin film transistor is connected with a same-level output end; a grid of the second thin film transistor is connected with a second node, a source electrode of the second thin film transistor is connected with the same-level output end, and a drain electrode of the second thin film transistor is connected with a low level signal end; a grid of the third thin film transistor is connected with the first node, a source electrode of the third thin film transistor is connected with the low level signal end, and a drain electrode of the third thin film transistor is connected with the second node; a grid of the fourth thin film transistor is connected with the second node, a source electrode of the fourth thin film transistor is connected with the low level signal end, and a drain electrode of the fourth thin film transistor is connected with the first node; the first capacitor is connected between the clock signal end and the second node; the discharge module is connected between the clock signal end and the same-level output end; and the compensation module is connected between the first node and the low level signal end. The invention has the advantages of low cost, low power consumption, long service life, high stability, strong interference resistance, small delay, and the like.

The invention discloses an intelligent terminal cabinet for fresh vegetable sale, an internet sale system and method. The intelligent terminal cabinet is composed of a main control cabinet and a plurality of auxiliary cabinets. A plurality of storage boxes are arranged below each auxiliary cabinet. Each storage box is provided with a refrigeration unit module and a thermal insulation system. The main control cabinet, all the auxiliary cabinets and all the storage boxes are respectively provided a unique ID address. Duplex communication is built between the main control cabinet and a mobile internet through a wire communication module and / or a wireless communication module. A first-stage communication bus is further built between the main control cabinet and each auxiliary cabinet, and a second-stage communication bus is built between each auxiliary cabinet and each storage box arranged below the corresponding auxiliary cabinet. Stable communication is guaranteed when extension is conducted due to the fact that a distribution-typed structure is adopted for the main control cabinet, the auxiliary cabinets and the storage box, and the normal work of other cabinets and boxes cannot be affected when any independent auxiliary cabinet or any independent storage box fails to work properly.

The invention discloses an SLAM method based on multi-camera cooperation. 360-degree observation of a detection environment is realized through a plurality of cameras which supplement visual fields mutually; each camera independently acquires and analyzes data; meanwhile, in the processes of map construction and motion tracking, the map is tracked; the effective camera collaboratively completes the tasks of generation of shared map points with scale information and joint pose estimation; map construction and high-precision positioning tasks of the panoramic SLAM system can be completed throughcooperation of imaging and structural characteristics of multiple cameras. The problem that the perception visual field of the existing pure visual SLAM system is limited, the positioning precision of a weak texture environment is poor; the map scale information lacks, illumination resistance and shielding capability are weak and the like are solved, meanwhile, a plurality of cameras are independent of one another, the normal work of the system cannot be influenced when any camera goes wrong, the system has certain robustness on the conditions of object shielding, direct sunlight, lens damage and the like, and a technical guarantee is provided for autonomous navigation of the unmanned platform.

The invention discloses a gravity inductive type axis-counting device and a method for detecting the state of a tract district thereof, relating to a railway transport management device and a management method thereof. The gravity inductive type axis-counting device comprises an axis detector, an axis-counting information processing system, an input-output subsystem and a power supply, wherein the axis detector is composed of a wheel electronic detector and a gravity inductive type sensor unit; the wheel electronic detector consists of an axis-counting CPU unit, a signal processing unit, a sensor power unit and a state detecting unit; the axis-counting information processing unit comprises a CPU unit, a communication unit, and an I / O unit; and the input-output subsystem consists of a dynamic drive assembly unit, a relay and a button. In the method, a wheel signal is detected by a gravity inductive type sensor arranged on a rail, and is transmitted to the wheel electronic detector and the axis-counting information processing unit for processing, thus judging the state of the tract district. The invention has the advantages of accurate detection result, high reliability, scientific method and capability of realizing automatic judgment on the idle and occupied states of the tract district.

The invention relates to a sampling clock generation circuit for a multichannel time interleaving analog-digital converter. The sampling clock generation circuit for the multichannel time interleaving analog-digital converter is composed of a multiphase clock generation module, a duty ratio recovering circuit and a channel selection module, wherein the multiphase clock generation module generates a multiphase clock signal required by the multichannel analog-digital converter and compensates for the a phase error of the multiphase clock signal at the same time, so that the accuracy of sampling clocks between channels of the analog-digital converter is guaranteed; the duty ratio recovering circuit conducts edge adjustment on a multiphase clock generated by the multiphase clock generation module, namely duty ratio recovery is conducted, and the output multiphase clock signal serves as a sampling clock signal of a sampling hold circuit; the channel selection module receives a control code written in through an external serial port, judges the number of required internal channels, controls the opening and closing of the internal channels and selects a multiphase clock inside a multiphase pulse module according to the control code, so that sampling clock generation is achieved under the condition that different channels are selected.

The invention discloses a display screen, a display device, a display circuit for the display screen and a brightness compensation method of the display circuit. The display screen comprises a normaldisplay area and a transparent display area, and the display circuit comprises a first pixel circuit, wherein the first pixel circuit is arranged corresponding to the normal display area; a second pixel circuit which is arranged corresponding to the transparent display area, wherein the structures of the first pixel circuit and the second pixel circuit are different, so that the light transmittance of the transparent display area is higher than that of the normal display area. The invention discloses the display circuit for the display screen. The pixel circuit different from the normal display area of the display screen is arranged in the transparent display area of the display screen, so that the light transmittance of the transparent display area is effectively improved, the optical detector and the camera can be arranged in the transparent display area, so that the screen-to-body ratio is effectively improved, and meanwhile, the normal work of the optical detector and the camera and the normal display function of the display screen are not influenced.

The invention relates to a safety brake and redundancy control system of a mine hoist. Detection signals of a roller rotation speed sensor and a motor rotation speed sensor are input into a speed redundancy detector, the processed detection signals are input into a speed signal comparer, compared with a command signal, and then input into a speed closed-loop controller, the speed closed-loop controller transmits the signals to a pressure signal comparer and a pressure feed-forward controller, the pressure signal comparer compares a signal of a pressure sensor and an output signal of the speed closed-loop controller, a comparison result is input into the pressure speed closed-loop controller, and a signal of the speed closed-loop controller is input into an adder through a switch to form a control signal of a tee proportional depressurization valve; and when the pressure sensor is cut off, the output signal of the speed closed-loop controller is input into the adder after being processed by the pressure feed-forward controller, and an output signal of the adder controls the tee proportional depressurization valve, so that the braking torque is controlled. The safety brake and redundancy control system is high in control precision and response speed, and the mine hoist can brake at constant retarded velocity.

The invention provides a direct current power supply system for a transformer substation and a control method thereof. The direct current power supply system comprises a centralized monitoring module, a direct current operation power module, an uninterruptible power supply (UPS) power module, an inversion power supply module, a communication power supply module and a lithium iron phosphate energy storage module; each module of the direct current power supply system is connected to a common direct current bus through a relay switch, and redundancy backup of each module is realized in a mode that each module is connected in parallel to the common direct current bus through a multi-submodule; the modules of the direct current power supply system are connected with the centralized monitoring module through a controller area network (CAN) communication bus; the centralized monitoring module collects the running state information of each module and manages the modules of the system uniformly; and a battery is charged or discharged slightly through intelligent coordination control, and on-line automatic maintenance of the battery is realized. The invention has the advantages that: the system has high reliability, high shock load resistance, no maintenance, small floor area, energy conservation and environmental friendliness; and the service life of the battery is prolonged and the performance of the battery is improved by the intelligent coordination control method.

The invention provides an electric device fault detecting system which comprises an acquisition module, a fault diagnosis device, a diagnosis monitoring device and a warning device. The acquisition module is used for acquiring parameter information to be detected of an electric device. The fault diagnosis device is used for adjusting a preset range of standard parameter information and / or controlling the warning device to send prompting information to a worker according to the parameter information to be detected. The diagnosis monitoring device is used for monitoring diagnosis data, curves and a device state. The electric device fault detecting system automatically conducts real-time monitoring on the fault situation of the electric device, improves detection efficiency, avoids production accidents, uses the fault diagnosis device to automatically adjust the preset range of the standard parameter information memorized internally according to a detected result, enables the working state of the electric device to form a closed loop monitoring, can timely recognize abnormal state and faults, sends the device fault prompting information to the worker in real time, does not need to shut down the electric device and ensures normal work of other devices.

Embodiments of the present application disclose a service identifier generation method and apparatus. A service identifier generator is assigned exclusively to at least one service server of a plurality of service servers. The method comprises: a service identifier generator receiving a service identifier obtaining request message (carrying a service server identifier and a service object identifier); in response to the message, querying a current maximum service identifier value of a target service object indicated by the service object identifier, performing hash calculation on the service server identifier, and performing modulo calculation on a preset threshold by using a hash calculation value; and firstly calculating a product of a modulo calculation value and a preset step value, secondly calculating a sum of the product and the maximum service identifier value as a starting value, calculating a sum of the starting value and the preset step value as an ending value, and finally generating an initial service identifier range. According to the method and apparatus provided by the embodiments of the present application, the range of influence of the service identifier generator failure on the service can be reduced, and it can also ensure that the generated service identifier is unique.

The invention discloses a resonator and a filter. The resonator comprises a substrate, a bottom electrode layer, piezoelectric layers, top electrode layers and a connecting structure, wherein the bottom electrode layer is positioned on the upper side of the substrate; the bottom electrode layer is positioned on the lower sides of the piezoelectric layers integrally or partially; the top electrode layers are positioned on the upper sides of the piezoelectric layers,; and the connecting structure is positioned outside an effective area of the resonator and is in electric contact with the bottom electrode layer and / or the top electrode layers. According to the resonator, the connecting structure is arranged additionally to be connected with at least electrode layer, so that the input impedance of the resonator can be reduced effectively to improve the performance of the resonator and the filter (a Q value of the resonator is prevented from being reduced); and the connecting structure is positioned outside the effective area of the resonator, so that the normal operation of the resonator is not influenced.

The invention discloses a bus-based battery pack equalizer circuit. The bus-based battery pack equalizer circuit comprises N batteries; each battery is connected with a corresponding equalizer circuit and the equalizer circuit is connected to a controller; each battery is connected with one equalizer circuit and each equalizer circuit is connected to one controller; the batteries correspond to the equalizer circuits one to one and the equalizer circuits correspond to the controllers one to one; the controllers are used for controlling the equalizer circuits according to the energy information of the battery pack, and thus realizing two-way flow of energy between the battery module and an energy transmission bus and realizing equalized energy storage of the batteries; the N controllers are connected in parallel to a data bus and the N batteries are connected in parallel to an energy transfer bus; N is greater than or equal to 2.

The invention provides a distributed multi-AGV dynamic task allocation and path planning method and system. The system mainly comprises an upper task management host and a plurality of isomorphic AGVs. The upper task management host is responsible for task management and distribution, and the upper task management host is mainly composed of a task information management module, a bidding task distribution module and a host wireless communication module. The AGVs are responsible for respective task path planning and execution, and each AGV is mainly composed of an AGV wireless communication module, an AGV task management module, an AGV bidding module, a single task path planning module, a task sorting module and a task execution module. According to the method, decentralized management among multiple AGV individuals can be realized, so that the problems of large calculation amount and low efficiency of path planning under dynamic tasks are solved. The efficiency of AGV execution of all tasks is improved, the management cost of a warehouse is reduced, the operation efficiency is improved, and the method has a relatively good application prospect.

The invention discloses an IGBT online state monitoring method and measuring system based on Miller platform delay. One end of a drive signal pre-processing circuit is connected with one end of a controller through a time measuring circuit. The other end of the controller and the drive chip of an IGBT device drive circuit are connected. The drive chip is divided into two paths. One is connected with an IGBT device, and the other is connected with the drive signal pre-processing circuit. The drive signal pre-processing circuit extracts the Miller platform delay in a drive voltage signal of an IGBT turn-on process as the characteristic parameter of IGBT state monitoring to carry out initial state calibration and real-time online monitoring. The health and reliability of the IGBT device during an aging process are evaluated. According to the invention, online monitoring and parameter extraction do not affect the operation of a main circuit, and are sensitive to various typical failure modes; and the method and the system can be directly used for health monitoring and service life evaluation of the IGBT, and solve the problem of lack of effective characteristic parameters in the existing state monitoring technology of power electronic devices.

The invention discloses a massive fragment data aggregation system for two kinds of massive fragment data. The system comprises a fragment uploading module of a client, and a cache module, a verification library module, a document storage module, a fragment receiving module, a fragment processing module, a fragment combination module and a fragment aggregation module of a server. Correspondingly, the invention also discloses a massive fragment data aggregation method. By the system and the method, a plurality of technologies such as message queuing services, memory banks, document databases, daemon processes and the like are adopted, so that the massive fragment data can be highly efficiently processed and combined; and a strict combination strategy is adopted, so that combination accuracy is ensured.

The invention discloses a visual drug management device which comprises a drug cabinet and a plurality of drug storage boxes. Magnetic devices are arranged on one inner side wall of the drug cabinet and peripheral side walls of each drug storage box, a power interface and a communication interface are formed in each magnetic device, two adjacent drug storage boxes are sucked through the magnetic devices on the adjacent surfaces of the drug storage boxes, so that the power interfaces and the communication interfaces of the drug storage boxes are connected, the drug storage box at a starting position and the magnetic device on the drug cabinet are sucked through the corresponding magnetic device, a power supply provided by the drug cabinet is received, and the drug cabinet is communicated with data communication links of the drug storage boxes. The drug management device reminds the aged of taking which drug at what time by sound and light warning modes, the drug management device is visual in instruction and does not easily make mistakes, data and electric power between the drug storage boxes are connected by the aid of a net structure, normal operation of the other drug storage boxes cannot be affected even if one drug storage box is faulted and cannot work, and maintenance complexity is simplified.

The invention relates to a junction box, which comprises a box cover, a box body and a plurality of parallel metal connectors, and is characterized in that the box body is divided into two chambers by a baffle plate, and the two chambers are respectively a closing chamber and a radiating chamber, wherein a plurality of mounting grooves are mounted in the closing cavity in parallel near the baffle plate, the metal connectors are inlayed in the mounting grooves, the bottom surface of the closing cavity which is faraway from the baffle plate is provided with a hole, a hole is arranged on the baffle plate which is corresponding to the metal connectors, the number of the box cover is two, and the two box covers are respectively a closing cover and a radiating cover, and the closing cover and the radiating cover are matched with the closing cavity and the radiating cavity, and radiating holes are arranged on the lateral surface of the radiating cavity or the radiating cover. The junction box can radiate the portion which needs to radiate in the box body, and close the portion which needs to be closed, optimizes the property of the junction box, and can effectively improve the service span of the junction box.

The invention relates to a flyback synchronous rectification control circuit, comprising a primary switching tube (Q1), a synchronous rectifier tube (Q2), a primary side of a main transformer (T1), a subsidiary side of the main transformer (T2), a synchronous rectifier module, a control circuit composed of a drive circuit (1), a delay circuit (2), a signal same-phase transmission circuit (3), a sharp pulse forming circuit (4) and a synchronous rectification forcibly turned-off circuit (5). When a power source operates in a continuous mode, the synchronous rectifier tube (Q2) can be forcibly turned off in advance through the control circuit, thus reverse current can not pass through the synchronous rectifier tube (Q2), thereby reducing the loss and the voltage stress of the synchronous rectifier tube (Q2), and improving the efficiency of the power source; and when the power source operates in a discontinuous mode or in a critical continuous mode, the control circuit is inoperative, and can not influence the normal operation of the circuit.

The invention discloses an LED protecting chip based on PWM shunt, which comprises a PWM shunt switch, a power supply unit, a voltage detecting unit, a temperature detecting unit and a PWM control signal generating unit, wherein the PWM shunt switch is connected with two ends of an LED in parallel, and the current passing through the LED is controlled by controlling the working duty ratio of the PWM shunt switch; the power supply of the chip is taken from the two ends of the LED and supplies power for other units after being processed by the power supply unit; the grounding terminals of the power supply unit, the temperature detecting unit and the PWM control signal generating unit are connected with the cathode of the LED; the voltage detecting unit and the temperature detecting unit respectively detect the voltages at the two ends of the LED and the junction temperature of the LED, and detecting signals output by the voltage detecting unit and the temperature detecting unit are connected with the PWM control signal generating unit; and PWM signals generated by the PWM control signal generating unit are connected with the control terminal of the PWM shunt switch to realize constant temperature, overvoltage and shut-off protection of the LED. The LED protecting chip has the advantages of complete protecting functions, low power loss, simple power supply and easy integration.

The invention discloses an anti-overflow moisture-preserving electric cooker and a cooking control method thereof, and relates to the technical field of kitchen cooking equipment. By the anti-overflow moisture-preserving electric cooker, the technical problem that overflow is difficult to avoid in the prior art. The anti-overflow moisture-preserving electric cooker comprises a cooker body and a cooker cover, wherein a steam valve with vent holes is arranged on the cooker cover; accommodating space opposite to the vent holes is arranged in the steam valve; a valve body is accommodated in the accommodating space and encloses part of areas of the vent holes under the action of the gravity of the valve body and is away from the vent holes under the pushing of air flow which is exhausted from the vent holes; and a sensor which is connected to a control circuit is arranged on the cooker cover and sends a detection signal to the control circuit under the trigger action of the valve body. The anti-overflow moisture-preserving electric cooker is mainly used for various electric cookers such as ordinary electric cookers, electromagnetic heating electric cookers and the like.

The invention discloses an LED landscape city building facade cluster light Internet control system, which comprises a centralized control terminal, a server terminal and node terminals, wherein the centralized control terminal is configured to be in communication connection with the server terminal and the node terminals through a wired and / or wireless network, so as to control the node terminal to combine or integrally link a node LED lamp, the server terminal is configured to receive data information sent by the centralized control terminal and send the data information to the node terminals, and monitor the work states of the node terminals in real time and feed the work states of the node terminals back to the centralized control terminal, and the node terminals are configured to control the data uploading, downloading and lighting of verious node LED lamps according to the received data information. The Internet control system provided by the invention can meet the linkage control and remote control on multi-node building facade cluster light, and has high flexibility.

The invention relates to a plasma air sterilizing and purifying device for an air-conditioned train, which comprises a plasma reactor, a pulse power source, a fan component, an air inlet, an air outlet and a shell and is characterized in that a positive electrode which is formed by arranging a plurality of nickel-chromium metal wires or nickel-chromium metal bands in the same plane at equal intervals in parallel is arranged in the plasma reactor; the positive electrode is arranged in the middle position of two adjacent negative electrodes; the two ends of the positive electrode are fixed in a groove or a convex part corresponding to a conductor rail for preventing micro-discharge; each negative electrode is made of an aluminum plate the surface of which is oxidized, and nano-TiO2 is respectively laid on the two surfaces of each negative electrode; and a pulse transformer and a pulse generator are arranged in the pulse power source and are arranged according to a single-ended flyback inverter. The device of the invention is arranged at the return air inlet or the air outlet of an air conditioner in a carriage, and the existing facilities of the air-conditioned train do not need to be changed. The device of the invention is the optimal combination of plasma and TiO2, has high dynamic sterilization and purification efficiency of a passenger train, and has the advantages of energy saving, good reliability, long working life, simple structure and convenient installation.

The invention discloses a low-voltage-difference linear voltage stabilizer circuit. The low-voltage-difference linear voltage stabilizer circuit is characterized in that the output end of a low-voltage-difference linear voltage stabilizer is connected with an auxiliary circuit; the auxiliary circuit comprises a first resistor, a first capacitor and a pull-up transistor; and due to an RC (Resistance-Capacitance) oscillating circuit formed by the first resistor and the first capacitor, when negative pulse occurs on the voltage of the output end of the low-voltage-difference linear voltage stabilizer and the low-voltage-difference linear voltage stabilizer can not response in time, the RC oscillating circuit is utilized for opening the pull-up transistor, the pull-up transistor is utilized for pulling the voltage of the output end of the low-voltage-difference linear voltage stabilizer, so that the falling range of the voltage of the output end is less; and finally, the low-voltage-difference linear voltage stabilizer is utilized for restoring the voltage of the output end into the original output voltage. The low-voltage-difference linear voltage stabilizer circuit has the advantages that since the falling range of the voltage of the output end is less, a load device can work normally, and the reliability of the circuit in the load can not be influenced; and under the normal condition, the auxiliary circuit does not need to generate power consumption without influence on the normal working of a power supply.

The invention provides an IPv6 digital network lighting control system, which adopts an IPv6 network as a basic communication network. The system comprises a central server, a packet server, a management unit and a lighting control unit, wherein the central server centrally manages each lower sub-control management unit through an IPv6 network switch, and provides a uniform control management platform for a user; the packet server comprises an area unit which monitors each lighting node through a field bus based on IPv6, and a management unit which detects exceptional state of equipment and reflects the state to the central server; and the lighting control unit realizes monitoring and controlling to the lighting node through the lighting control sub-system. A similarly constructed IPv6 digital network lighting control system manages terminals in other types. As the IPv6 technology is supported, the system provides rich address space, has good expandability, and ensures high-speed connection among all equipments in the system with plug and play and good mobility, thereby ensuring that the system is very suitable for managing large-scale management and control.

The invention discloses a multi-channel light adjustable light-emitting diode driving power source which comprises a PFC (Power Factor Correction) module, an LLC (Logic Link Control) module and a BUCK module, wherein the PFC module is used for receiving and inputting an alternating voltage, carrying out power factor correction and outputting a stable direct-current busbar voltage; the LLC module is used for decompressing and isolating the direct-current busbar voltage and outputting a constant low voltage lower than the direct-current busbar voltage; the BUCK module is used for outputting a constant current to an LED (Light Emitting Diode) light source module; the BUCK module adopts an L6562 chip and is used for adjusting a reference voltage through an adjustable resistance, changing a sampling peak current and an output current and adjusting the luminance of the LED light source module. The embodiment of the invention can supply multiple channels for driving the output of the LED light source module and can realize the purpose of adjusting the light of the LED light source module.

The invention relates to an automatic glass crushing emergency escape and alarm system and a traffic vehicle. The automatic glass crushing emergency escape and alarm system comprises glass crushing devices used for crushing glass, independent control devices and centralized control devices. The independent control devices are used for receiving signals and controlling detonation of the glass crushing devices. The independent control devices are connected with the glass crushing devices. The centralized control devices are connected with the independent control devices through a communication bus or a conductive wire. The independent control devices and / or the centralized control devices comprise fault self-diagnosis systems which can conduct fault diagnosis on electric ignition circuits in real time. The automatic glass crushing emergency escape and alarm system and the traffic vehicle have the advantages that the occurrence of accidents can be sensed automatically, the glass can be crushed automatically, the fault self-diagnosis system can diagnose circuit faults in real time, it is guaranteed that the system is in the working state, and the safety coefficient is high.

Before being restarted smoothly, router generates an Opaque LSA 'flooding' in own domain to inform other router that self is ready to restart smoothly. After receiving the Opaque LSA, remote routers mark links relevant to the smooth restarted router as status indication of 'potential unavailable', but no operation is executed. Till receiving Opaque LSA indicating that smooth restarting state is ended from the router, remote routers deletes the said status indication. But, if in restarting, synchronizing or ending phases, change of link status happens in network, then remote routers will switches status indications of links relevant to the smooth restarted router from 'potential unavailable' to 'unavailable' as well as updates information base of link status and recalculates routes immediately, and remote routers makes the said corresponding action unnecessary waiting for a unavailable LSA of relevant links sent from router adjacent to the smooth restarting router.

The embodiment of the invention discloses a method for measuring optical power, an optical line terminal and an optical network unit, belonging to the communication field. The method comprises the following steps: generating physical layer operations and maintenance (PLOAM) information which comprises identification of ONUs to be measured and information of time intervals distributed to the ONUs to be measured and used for transmitting upstream optical signals; transmitting the PLOAM information to a plurality of ONUs; receiving the upstream optical signal transmitted by ONUs to be measured in the distributed time intervals; and detecting the received upstream optical signals and determining the optical power of the upstream optical signals. The invention avoids bandwidth wastage caused by bandwidth for optical power detection assigned by a DBA module to the ONUs to be measured in the process of optical power detection in the prior art.