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205results about How to "Short switching time" patented technology

Protection switching method and device in Ethernet passive optical network

The invention discloses a protection switching method in an Ethernet passive optical network, which comprises the following steps of: synchronizing in real time configuration data between an active port and a standby port of an optical line terminal (OLT); and performing dynamic bandwidth allocation on logical link identifiers (LLID) in the active and standby ports, performing normal dynamic bandwidth allocation on online LLIDs and performing the dynamic bandwidth allocation on offline LLIDs according to a set period by using the OLT. The invention simultaneously discloses a protection switching device in the Ethernet passive optical network, which comprises a synchronization unit used for realizing the real-time synchronization of the configuration data between the active and standby ports of the OLT, and a dynamic bandwidth allocation unit used for performing the dynamic bandwidth allocation on the LLIDs in the active and standby ports, performing the normal dynamic bandwidth allocation on the online LLIDs and performing the dynamic bandwidth allocation on the offline LLIDs according to the set period. The method and the device have the advantages of maximally reducing influenceto data transmission in the EPON and improving the quality of communication services of the EPON.
Owner:ZTE CORP

A clock synchronization method and device

Disclosed in the embodiments of the present invention are a method and device for clock synchronization. The method comprises the following steps: slave clock equipment simultaneously carries out protocol message interactions with multiple clock source equipment , and respectively computes the time and frequency deviation with each clock source equipment according to the protocol message interaction with the multiple clock source equipment to lock the multiple clock source equipment; the slave clock equipment selects a primary clock source from the multiple clock source equipment, and corrects self time and frequency according to the time and frequency deviation with the primary clock source. According to the embodiments of the present invention, the clock source equipment is immediately locked as soon as being discovered rather than starts to be locked after being switched, so that the multiple clock source equipment is simultaneously locked by the slave clock equipment, and when the clock source equipment switching occurs, the clock source equipment is switched into the currently locked clock source equipment, and therefore, the synchronization accuracy of the time and frequency during switching can be ensured to the maximum extent, the switching speed of the clock source equipment is accelerated and switching performance is enhanced.
Owner:ZTE CORP

Double-control double-active storage control system and method

InactiveCN103092786ARealize simultaneous reading and writingIncrease profitElectric digital data processingApplication serverGranularity
The invention discloses a double-control double-active storage control system and a method. The double-control double-active storage control system comprises two storage controllers and further comprises a magnetic disk cabinet which is connected with the two storage controllers, wherein each storage controller comprises a storage resource management module and a cache module. The storage controllers receive requests of an application server, and flash corresponding caching data in the cache modules to the magnetic disk cabinet with a magnetic disk array stripe as a unit, or read data in the magnetic disk cabinet to the cache modules with the stripe as the unit. Occupied magnetic disk cabinet resources are released after completion of flashing or reading. According to the double-control double-active storage control system and the method, due to the fact that the storage resource management granularity is refined, simultaneous reading and writing of the two controllers are achieved from a macroscopic view. Transmission buses and computing resources are fully utilized, and the storage performance is improved. Furthermore, due to the fact that a novel storage resource management mode is adopted, the use ratio of bus resources of the double controllers and the computing resources is improved, the storage performance and volume are improved, and the switching time of storage system breakdown is lowered.
Owner:INSPUR BEIJING ELECTRONICS INFORMATION IND

Brightness compensation method, brightness compensation circuit and display device

The invention discloses a brightness compensation method, a brightness compensation circuit and a display device. The brightness compensation method includes the steps: a display panel acquires a reference compensation coefficient from a flash memory at the beginning of display; the obtained reference compensation coefficient is stored in a random access memory; and finally, a scaling coefficientcorresponding to the current to-be-displayed frame image is obtained, and the reference compensation coefficient corresponding to each sub-pixel in the random access memory is multiplied by the scaling coefficient to generate a target compensation coefficient corresponding to the current to-be-displayed frame image and display according to the target compensation coefficient. By means of the compensation method, no matter how many frame frequencies are supported by the display panel, as only the reference compensation coefficients need to be stored in the random access memory and the flash memory, compared with an existing driving method, the size can be reduced by at least one time, and when the frame frequency is switched, the target compensation coefficient can be obtained only by multiplying the reference compensation coefficient by the scaling coefficient, and the compensation coefficient does not need to be reloaded, so that the switching time is short, and a screen does not needto be turned off.
Owner:WUHAN TIANMA MICRO ELECTRONICS CO LTD

Dual-redundancy dispatching control system for aircraft alarm computer

The invention provides a dual-redundancy dispatching control system for an aircraft alarm computer. The dual-redundancy dispatching control system is characterized by comprising two platforms A and B, wherein each platform mainly comprises an input driving module, a control module and an output driving module, the control module is in interaction with a bus through a discrete IO port, an input acquisition module is used for acquiring discrete and bus alarm information, the control module is used for processing the alarm information according to a certain alarm logic, the output driving module is used for outputting the discrete and bus alarm information, and the control module is used for giving out a self-inspection signal, detecting whether faults occur in the input acquisition module and the output driving module or not and backwards reading according to a self-inspection backward-reading signal. The control module detects whether the fault occurs in the control module or not through self inspection and is in periodic communication with the other platform through synchronous information interaction with the IO port and bus interaction according to the acquired alarm information, and thus, the problems of not-in-time switching, inconvenience in fault diagnosis and recovery and low reliability in the prior art are solved.
Owner:SHANGHAI AVIATION ELECTRIC
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