Patent application number | Description | Published |
20080199182 | Transmission system and transmission method - A wavelength division multiplexing system according to the present art adjusts the amount of dispersion compensation (the amount of dispersion compensation of an NZ-DSF and a DCF) every all spans on the basis of the time slot when an intensity modulation signal transmitter outputs an intensity modulation signal and the wavelength interval when a wavelength coupler multiplexes a phase modulation signal (output from a phase modulation signal transmitter) and the intensity modulation signal. | 08-21-2008 |
20090041456 | Wavelength division multiplex signal monitoring system and wavelength division multiplex transmission device equipped with the same - A WDM signal monitoring system includes a measuring unit that measures power levels in a plurality of predetermined wavelength bands about a wavelength division multiplex signal, a waveform determination unit that determines an approximate waveform of each channel from each bit rate and modulation system of a plurality of channels which forms a wavelength division multiplex signal, and an approximation unit that determines a power level and a wavelength of each channel by approximating the power level in a plurality of wavelength bands which the measuring unit measured with the approximate waveform of each channel which the waveform determination unit determined. | 02-12-2009 |
20100158532 | WDM TRANSMISSION APPARATUS, OPTICAL ADD-DROP MULTIPLEXER AND WDM TRANSMISSION METHOD - There is provided a WDM transmission apparatus including a calculator being operable to calculate an optical signal level of a wavelength after wavelength demultiplexing based on information of OSNR, an amplifier controller being operable to compensate for the optical signal levels of all the wavelengths after wavelength demultiplexing to become a target level based on an optical signal level calculated by the calculator, and an deviation corrector being operable to correct a deviation of an optical signal level between each wavelength based on the optical signal level calculated by the calculator. | 06-24-2010 |
20100303459 | DISPERSION COMPENSATING APPARATUS, DISPERSION COMPENSATING METHOD, OPTICAL RECEIVING APPARATUS, AND OPTICAL RECEIVING METHOD - A dispersion compensating apparatus includes a tunable dispersion compensator that dispersion-compensates an optical signal using a group delay property that is asymmetrical in bands outside an effective band; a set device that sets a dispersion compensation amount in the tunable dispersion compensator; and a shifter that shifts a central frequency of the effective band of the tunable dispersion compensator, based on the dispersion compensation amount set by the set device. | 12-02-2010 |
20110058821 | OPTICAL TRANSMISSION APPARATUS, OPTICAL TRANSMISSION SYSTEM, AND OPTICAL TRANSMISSION METHOD - An optical transmission apparatus in an optical transmission system that transmits an optical signal through a transmission fiber includes a measurement device that measures Raman gain efficiency of the transmission fiber; a level determiner that determines an input level of the optical signal based on Raman gain efficiency measured by the measurement device; and a controller that controls a level of the optical signal input to the transmission fiber to become the input level determined by the level determiner. | 03-10-2011 |
Patent application number | Description | Published |
20100017648 | COMPLETE DUAL SYSTEM AND SYSTEM CONTROL METHOD - A DB server included in an old operation node corrects a recovery log stored in a recovery log storage unit by using a difference log stored in a difference log storage unit. A duplication control device and a DBMS compare a difference log file stored in the difference log storage unit and a recovery log file stored in the recovery log storage unit, and correct the content of the recovery log file accordingly. | 01-21-2010 |
20100020678 | SWITCHING PROGRAM, SWITCHING METHOD AND FULL DUPLEX SYSTEM - When a switching unit of each of first DB servers receives a transaction-stop instruction request from a second DB server, the switching unit performs a transaction-stop instruction process. When a transaction processing unit of each of the first DB servers receives a transaction stop instruction from the switching unit, the transaction processing unit performs a transaction stop process. In the same manner, a transaction processing unit of the second DB server performs a transaction stop process. Each of the transaction processing units of the first and second DB servers determines whether a transaction is to be stopped depending on a processing attribute and a processing state of an SQL included in the transaction and then performs the transaction stop process depending on a determination result of the processing attribute and the processing state. | 01-28-2010 |
20100030789 | INFORMATION MANAGEMENT SYSTEM - An active device attaches a sequential number representing a notification number to update record information for recording an event that data is stored, then notifies a preliminary device of the update record information, and, accumulates the update record information. The active device again makes the notification. The preliminary device monitors the update record information of which the active device notifies and detects, based on regularity of the sequential numbers attached to the respective pieces of update record information, missing reception of the update record information. When detecting the missing reception of the update record information, the preliminary device makes a request for retransmitting the update record information and notifies of information about matching data stored in a first storage unit of the active device with data stored in a second storage unit of the preliminary device. | 02-04-2010 |
Patent application number | Description | Published |
20130227357 | MEMORY MODULE REDUNDANCY METHOD, STORAGE PROCESSING DEVICE, AND DATA PROCESSING DEVICE - A system includes one or more memory modules provided with a plurality of operation blocks having a plurality of memory elements which may be simultaneously operated. The system performs write access concurrently by writing data to two or more selected operation blocks. When a fault is detected in one of the two or more operation blocks, access is performed including the write access to two or more operation blocks excluding the operation block in which the fault is detected. | 08-29-2013 |
20130246851 | INFORMATION PROCESSING APPARATUS, A SENDER APPARATUS AND A CONTROL METHOD OF THE INFORMATION PROCESSING APPARATUS - An information processing apparatus may include a sender apparatus and a receiver apparatus connected to the sender apparatus. The sender apparatus includes a processor configured to output a plurality of output signals, a counter configured to send a report indicating that a predetermined time has been counted, and a pseudofault generator configured to change a value of any one of the output signals output by the processor based on the report sent from the counter. The receiver apparatus includes an error detector configured to detect an error with respect to the changed value of the one of the output signals output by the processor. | 09-19-2013 |
20140136910 | DATA COMMUNICATION APPARATUS AND CONTROL METHOD - A data communication apparatus includes a data generation unit, a control register, a memory, a memory address generation unit, a failure setting unit, and a transmission unit. The data generation unit generates data. The control register outputs an enable signal and a test control signal. In the memory, pseudo failure data is written during the test. The pseudo failure data is used to modify generated data to data having a pseudo failure. The memory address generation unit generates a readout address of the memory during the test on the basis of the enable signal and the test control signal. The failure setting unit reads out pseudo failure data from the memory using a readout address generated by the memory address generation unit, and modifies the generated data to data having the pseudo failure. The transmission unit transmits the data having the pseudo failure modified by the failure setting unit. | 05-15-2014 |