| FUJITSU TELECOM NETWORKS LIMITED Patent applications |
| Patent application number | Title | Published |
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| 20120106369 | COMMUNICATION SYSTEM, COMMUNICATION APPARATUS, AND RING NETWORK MONITORING METHOD - A communication apparatus forming a ring network sends a test frame that is not designed to be discarded at a block point in the ring network established to discard the user frame and that is configured to have a data size randomly selected from the data sizes permitted for the user frame, from a first communication port connected to a transfer channel in a first direction in the ring network. The communication apparatus determines that the transfer status of the user frame in the ring network is normal when the sent test frame is received via a second communication port connected to a transfer channel in a second direction in the ring network in a predetermined manner. | 05-03-2012 |
| 20120033929 | GUIDE STRUCTURE OF OPTICAL FIBER AND WIRING METHOD OF OPTICAL FIBER - A guide structure of an optical fiber includes a case in which a plurality of guide pin mounting holes are provided in accordance with the wiring route of the optical fiber, a plurality of guide pins formed of a conductive material, detachably attached to each of the guide pin mounting holes, and pulled out of each of the guide pin mounting holes after wiring the optical fiber, and providing a guide for wiring the optical fiber at the case by inserting each of the guide pins into each of the guide pin mounting holes. | 02-09-2012 |
| 20120016972 | SNMP AGENT DEVICE AND CONFIGURATION UNDO METHOD - An SNMP agent device includes: a receiving unit configured to receive an SNMP configuration command from a manager device; a configuration processing unit configured to update, when the configuration command designates management information and a configuration value, the management information in the agent device by the configuration value; and a configuration history storage unit configured to store the configuration command, mapping the configuration to a pre-update value of the management information. When the configuration command designates undo, the configuration processing unit performs an undo process of returning the management information updated by a past configuration command to the value occurring before the update. | 01-19-2012 |
| 20120008491 | RELAY APPARATUS FOR COMMUNICATION FRAMES AND RELAY METHOD - A layer 2 switch (L2SW) includes (i) a leaned information management unit for recording learned information that associates a receiving port, an address of another L2SW, and a source address specified in the original communication frame, when an encapsulated frame, in which a communication frame has been encapsulated by data containing the address of the another L2SW, is received from the backbone network and (ii) a status monitoring unit. The learned information management unit determines the update extent of the learned information, in accordance with a check result of the connection status and thus the occurrence of flooding transfer to a backbone networks side is suppressed. | 01-12-2012 |
| 20110217041 | PON SYSTEM, STATION-SIDE APPARATUS FOR PON SYSTEM, AND CONTROL METHOD THEREOF - An OLT, which is one of the embodiments of the present invention, is provided with: an allocation request receiving unit that receives a bandwidth allocation request from each of 1 G-ONUs and each of 10 G-ONUs; an allocation execution unit that allocates to each of the ONUs a time slot for data transmission in accordance with an allocation rule based on fairness in time allocation or an allocation rule based on fairness in throughput allocation; and an allocation result notification unit that notifies each of the ONUs of information regarding the time slot. | 09-08-2011 |
| 20110149988 | COMMUNICATION CONTROLLER - A switch includes: a packet buffer including a plurality of segments for temporarily storing a packet to be relayed, using a segment of a fixed size as a unit of management of a storage area; an input processor configured to receive a packet to be relayed from an external source, refer to an offset, indicating a location in a segment where a free area starts, store a first packet, starting at the location in the segment indicated by the offset, update the location of start indicated by the offset in accordance with the packet size, and store a second packet, starting at the location of start in the segment thus updated; and an output processor configured to read the first and second packets and send the packets to a communication node. | 06-23-2011 |
| 20110113154 | COMMUNICATION APPARATUS, INTERFACE CARD, AND FAILURE HANDLING METHOD - A communication apparatus of the embodiment is provided with a first IF card that performs a relay process of a data frame in a first direction of a ring network, a second IF card that performs a relay process of a data frame in a second direction of the ring network, a communication-status determination unit that monitors the communication status from the first IF card to the second IF card, a block control unit that sets a new block point to either the first IF card or the second IF card when the communication status is abnormal, and a ring protocol processor that notifies other communication apparatuses that constitute the ring network of information for notifying the switching of a block point in the ring network, which indicates that the new block point has been set. | 05-12-2011 |
| 20110103804 | OPTICAL TRANSMISSION SYSTEM - An optical transmission system is provided with an optical transmission apparatus, an optical reception apparatus, an optical transmission line redundantly configured with an active system optical transmission line and an standby system optical transmission line, an optical switch that switches an optical transmission line between the active system optical transmission line and the standby system optical transmission line, a variable dispersion compensator placed between the optical switch and the optical reception apparatus, a dispersion amount measuring unit that measures the dispersion amount of the standby system optical transmission line when the active system optical transmission line is being selected by the optical switch, a dispersion compensation amount setting unit that sets the amount of dispersion compensation to be applied to the standby system optical transmission line based on the measured dispersion amount of the standby system optical transmission line, and a control unit that controls, when the optical transmission line is switched from the active system optical transmission line to the standby system optical transmission line by the optical switch, the variable dispersion compensator so that the amount of dispersion compensation becomes the set amount of dispersion compensation. | 05-05-2011 |
| 20110064088 | COMMUNICATION APPARATUS AND COMMUNICATION CONTROLLING METHOD IN RING NETWORK - A ring connection apparatus according to one embodiment is provided with: a frame receiver that receives frames to be transmitted to one of the plurality of ring networks from each of the plurality of networks; and a frame transmitter that transmits each of frames, a passing frame to be transmitted from a device to another device inside said one ring network and a crossing frame to be transmitted to a device in said one ring network from a device in another ring network different from said one ring network, to said one ring network within the range of a band, which is separately determined in advance. | 03-17-2011 |
| 20110026941 | VARIABLE DISPERSION COMPENSATION DEVICE - A dispersion compensation device includes a variable dispersion compensator configured to subject an input optical signal to dispersion compensation, an optical receiver configured to convert an optical signal subjected to dispersion compensation into an electrical signal, recover a clock signal and a received data signal from the electrical signal, and output clock lock information indicating whether the clock signal is locked to the electrical signal, a signal processor configured to output bit error rate information on the received data signal, and a controller configured to variably control a dispersion compensation value of the variable dispersion compensator based on the bit error rate information and the clock lock information. | 02-03-2011 |
| 20110020000 | COMMUNICATION APPARATUS AT SUBSCRIBER HOME - An MC-ONU is an ONU installed at a subscriber's home. The MC-ONU includes: a receiving unit which receives signals transmitted from an OLT at a telecommunications carrier site which has not established a link; a determining unit which determines the OLT, which has not established a link, to be a remote-end device in point-to-point communication on the condition that the signal received for a predetermined period of time is idle signal only; and a transmitting unit which starts transmitting signals to the OLT from the subscriber's home on the condition that it has been determined by the determining unit that the OLT is the remote-end device in point-to-point communication. | 01-27-2011 |
| 20110008049 | TRANSMISSION APPARATUS, TRANSMISSION CONTROLLING METHOD, AND OPTICAL SUPERVISORY CHANNEL (OSC) PROCESSING APPARATUS - An integrated transmission apparatus includes a plurality of optical supervisory channel (OSC) processing units for processing OSC signals contained in a wavelength division multiplexing (WDM) signal received from a WDM network and a switching unit for performing the path control of synchronous digital hierarchy (SDH) frames. An OSC processing unit transmits the SDH frame, containing wavelength information indicated by, to the switching unit. Another OSC processing unit acquires the SDH frame, containing wavelength information, from the switching unit and sets an OSC signal which is to be appended to the WDM signal to be transmitted, based on the wavelength information. | 01-13-2011 |
| 20100322633 | TRANSMISSION SYSTEM AND METHOD OF CORRECTING TILT OF THE TRANSMISSION SYSTEM - A transmission system is provided with a transmission apparatus that outputs an ASE light from a transmission light amplifier and with a reception apparatus provided with: a tilt detection unit that detects the optical strength levels of at least two probe lights having different wavelengths from a received ASE light; and a reception light amplifier that performs a first-order tilt correction on light to be output in a linear manner so as to reduce the difference in the optical strength level of the two probe lights detected by the tilt detection unit. | 12-23-2010 |
| 20100226661 | WAVELENGTH DIVISION MULTIPLEXING TRANSMISSION SYSTEM AND APPARATUS AND OPTICAL SIGNAL NOISE RATIO CALCULATION METHOD - A wavelength division multiplexing (WDM) transmission system for transmitting a wavelength division multiplexed signal light from a sender transmission apparatus to a receiver transmission apparatus is provided. The system comprises a computing unit that subtracts from a first optical signal noise ratio (OSNR) of the signal light measured by the receiver transmission apparatus a second OSNR ascribed to a sideband of the signal light measured by the sender transmission apparatus so as to compute a corrected OSNR of an amplified spontaneous emission (ASE) noise light with a reduction of an effect of the sideband. | 09-09-2010 |
