| Patent application number | Description | Published |
|---|
| 20100077262 | INFORMATION PROCESSING DEVICE AND ERROR PROCESSING METHOD - An information processing device having two processing units capable of operating in synchronization with each other, includes: a common unit capable of outputting an identical signal to the two processing units; detection units that are respectively provided for the processing units and each detects errors occurred in corresponding processing unit respectively; a comparison unit that compares outputs from the two processing units; and a control unit that controls signals from the processing units to the common unit, based on a detection result of the detection units and a comparison result of the comparison unit, and determines, if errors of an identical type are simultaneously detected by the detection units, that the errors are due to an error of the common unit. | 03-25-2010 |
| 20100191942 | Information processor and control method - A northbridge, when detecting a synchronization break of a redundant CPU, stops the operation of an abnormal CPU bus where an error has occurred and the firmware in an FWH instructs the northbridge to inhibit an external instruction. In addition, the firmware save the inside information of a normal CPU connected to a normal CPU bus and cache data on a memory and the northbridge issues reset to all CPUs in the home system board. The firmware then restores the inside information of the CPU save on the memory to the all CPUs and instructs the northbridge to cancel the inhibition of the external instruction. | 07-29-2010 |
| 20100275084 | TRANSMISSION DEVICE, RECEIVING CIRCUIT AND CONTROL METHOD OF TRANSMISSION DEVICE - A transmitting circuit transmits data to which an error detection code is attached to a receiving circuit via a transmission path. When detecting the error of the data received via the transmission path, a receiving circuit transmits a retransmit request for the data in which the error is detected to the transmitting circuit. The receiving circuit enters a termination unit adjustment period using the error detection of the received data as a trigger and updates the resistance values of a receiving side termination unit installed at the termination of the transmission path to an appropriate value within the termination unit adjustment period. | 10-28-2010 |
| 20110309868 | Data transfer unit, data transmission device, data receiving device, and control method - A transmission LSI calculates a buffer usage rate in accordance with data stored in a buffer in a transmission data processing unit and determines, in accordance with the calculated buffer usage rate, the number of signal lines that perform a phase readjustment and the timing thereof. Then, the transmission LSI and a receiving LSI perform a phase adjustment using some of the signal lines and continues a data transfer using the rest of the signal lines. Accordingly, it is possible to maintain the optimum phase of a clock without delaying the data transfer. | 12-22-2011 |
| Patent application number | Description | Published |
|---|
| 20090162072 | Transmission apparatus and method of switching phase lock reference frequency signal thereof - An optical transmission apparatus according to the present invention connects a terminal apparatus side in which a transmission line is formed by, for example, SONET/SDH, and a WDM side in which a transmission line is formed by, for example, OTU3. The optical transmission apparatus according to the present invention includes a selector that, when an input signal is interrupted or switched, controls a PLL unit so as to switch and obtain a clock signal of a predetermined frequency oscillated by an OSC, corresponding to a frequency of a clock signal of the input signal before being divided to input into the PLL unit, as a clock signal to generate a PLL reference frequency. | 06-25-2009 |
| 20090297150 | Optical transmission apparatus, optical interface device, and optical transmission method - When an XFP is plugged into an optical interface unit by live-line plugging, an external bias voltage higher than an internal bias voltage is kept applied to a CDR incorporated in the optical interface unit until the XFP starts up. This prevents exertion of a negative effect on the CDR. | 12-03-2009 |
| 20090297163 | Reference-clock selection circuit and reference-clock selection method - A reference-clock selection circuit for a communication interface apparatus in which signals are input via a plurality of channels includes an insertion-stuff-bit-amount monitoring unit that monitors an insertion stuff bit amount to be inserted in the signal; a channel detecting unit that detects a channel where the insertion stuff bit amount inserted in the signal matches an insertion stuff bit amount of a reference signal from a reference clock oscillator; and a reference-clock selecting unit that selects the detected channel as a reference clock for network synchronization of a connected network. | 12-03-2009 |
| 20090297169 | Optical signal receiving apparatus and optical signal attenuation controlling method - A VOA maximum attenuation control circuit has, in addition to a conventional VOA maximum attenuation control circuit, a first resistor and a second resistor, a transistor which is an emitter follower type PNP transistor, and a capacitor. Since charge of the capacitor is 0 volt at the instant when power of the optical interface unit or each optical interface is shifted from OFF state to ON state, current is supplied to a VOA by the transistor in association with shift to the ON state of the power. As a result, attenuation of the VOA reaches maximum. When the capacitor is gradually charged, base potential of the transistor is finally +5 volts, and current is 0 ampere. Then shifting to maximum attenuation control of the VOA by an operational amplifier is realized. | 12-03-2009 |
| 20100098421 | Optical interface method and apparatus - An optical interface method includes producing a digital wrapper signal by synchronizing a client signal that is inputted via an optical transmission channel with an oscillating frequency of a fixed oscillator; returning the digital wrapper signal back into the client signal; and outputting the client signal obtained from the digital wrapper signal by the returning onto the optical transmission channel. The oscillating frequency of the fixed oscillator is set higher than a frequency of the client signal in the optical transmission channel. | 04-22-2010 |
| 20110110474 | TRANSFER APPARATUS, AND JITTER CONTROL METHOD OF TRANSMISSION SIGNAL - A transfer apparatus includes a receiver to receive an input signal and to extract a clock signal from the input signal, an input signal interruption detector to detect whether an input signal is input, an oscillator, and a frequency setter to set an oscillation frequency of the oscillator such that a difference between the oscillation frequency of the oscillator and a frequency of a frequency division signal into which a clock signal extracted from the input signal is frequency-divided falls out of a passband width of a filter when the input signal interruption detector detects the input of the input signal. | 05-12-2011 |
| 20110236031 | OPTICAL INTERFACE DEVICE, AND ABNORMALITY MONITORING METHOD FOR INPUT FREQUENCY DEVIATION - An optical interface device determines whether frequency deviation of a clock signal corresponding to an optical signal from a client side is abnormal based on a stuff amount when subjecting a data signal corresponding to an optical signal input from the client side to a stuffing process, inserts an alarm indication signal (AIS) indicating that the frequency deviation is abnormal into a predetermined region of a data signal when the deviation is determined to be abnormal, and outputs an optical signal generated corresponding to the data signal to a WDM line side so as to transfer the AIS to another component disposed downstream therefrom, so that locating a site where an abnormal state occurs is made easier. | 09-29-2011 |
| Patent application number | Description | Published |
|---|
| 20090131005 | Wireless terminal and level measurement method - A wireless terminal using switchable first and second reception antennas to perform diversity reception of data transmitted from a base station is proposed. The terminal includes an average value calculation unit that calculates an average value of a reception level measurement result of the first reception antenna and a reception level measurement result of the second reception antenna; and a correction unit that corrects the average value calculated on the basis of a predetermined thermal noise level, a received RSSI value measurement result of the first reception antenna, and a received RSSI value measurement result of the second reception antenna. | 05-21-2009 |
| 20090149145 | Wireless terminal - A wireless terminal has a diversity function and includes a plurality of receiving branches. Receiving units are provided for the plurality of receiving branches, respectively. The receiving units can receive radio signals of a plurality of frequencies. A controller controls in a gap zone in a compressed mode such that the receiving units are allowed to receive radio signals of different frequencies. | 06-11-2009 |
| 20100316020 | COMMUNICATION SYSTEM, MOBILE TERMINAL AND COMMUNICATION METHOD - A communication system includes a first base station for communicating complying with a first communication protocol, a second base station for communicating by using radio frames complying with a second communication protocol and transmitting synchronization signals complying with the first communication protocol, the synchronization signals synchronizing the transmitted radio frames, and a mobile terminal for communicating according to the process includes: receiving the synchronization signals from the second base station while communicating with the first base station, estimating transmitting timing of the radio frames including symbols on the basis of the received synchronization signals, measuring a receiving signal strength of the symbol on the basis of the estimated timing, and controlling a handover from the first base station to the second base station on the basis of the measurement result by the measurement of the receiving signal strength of the symbol. | 12-16-2010 |
