Abstract: An optical modulator includes: a modulator including an optical waveguide provided in a semiconductor substrate having an electro-optical effect and an electrode for applying an electric field depending on a bias voltage and a modulation signal to the optical waveguide; a modulation signal generator to generate the modulation signal of a first frequency; a superimposer to superimpose a signal of a second frequency different from the first frequency on the bias voltage; and a bias controller to control the bias voltage in a modulation direction of the modulator and the bias voltage in an orthogonal direction which is orthogonal to the modulation direction based on a phase of the second frequency component extracted from a modulated optical signal generated by the modulator.

Abstract: A management system for a storage system including a storage control device that provides a plurality of file sharing environments, includes: an average maintenance interval calculating part to calculate an average maintenance interval that is an average value of time intervals at which an operation command is given to each of the file sharing environments; a management difficulty calculating part, for each of the file sharing environments, to calculate a management difficulty that is an index quantitatively showing a difficulty to manage the file sharing environment and is determined based on a type and a quantity of resources included in the file sharing environment; a file sharing environment usage degree calculating part to calculate a file sharing environment usage degree that is an index showing a degree of usage of each of the file sharing environments and is determined based on an access frequency that is an index showing a frequency at which the users access the file sharing environment and the numbe

Abstract: Provided is a technology in which: a request-source storage device provides a request-source server device with a storage area of a disk drive as at least one logical volume; the request-source server device determines, upon receiving a request to back up data stored in a first logical volume, whether a second logical volume which constitutes a copy pair with the first logical volume is present in the request-source storage device; the request-source server device requests, upon determining that the second logical volume is not present, the request-source storage device to produce the second logical volume; and the request-source server device transmits a request to execute a process to back up data stored in the existing or produced second logical volume to the backup storage device to the request-destination server device. Accordingly, data to be stored in a NAS not locally coupled to a backup device is appropriately backed up.

Abstract: There is disclosed a die 1 for forming a honeycomb structure comprises: a plate-like die substrate 2 having at least two surfaces 8, 9, in which back holes 3 for introducing a green material are formed in one surface 8, and slits 4 communicating with back holes 3 are formed in the other surface 9; an underlayer 5 disposed on the substrate 2 so as to coat at least a part of a portion constituting the back hole 3 and the slit 4; an intermediate layer 6 disposed so as to coat at least a part of the underlayer 5 and constituted of tungsten carbide particles whose average particle diameter is 5 ?m or less and containing W3C as a main component; and a surface layer 7 disposed so as to coat at least a part of the intermediate layer 6 and constituted of diamond and/or diamond-like carbon.

Abstract: Provided is a technology in which: a request-source storage device provides a request-source server device with a storage area of a disk drive as at least one logical volume; the request-source server device determines, upon receiving a request to back up data stored in a first logical volume, whether a second logical volume which constitutes a copy pair with the first logical volume is present in the request-source storage device; the request-source server device requests, upon determining that the second logical volume is not present, the request-source storage device to produce the second logical volume; and the request-source server device transmits a request to execute a process to back up data stored in the existing or produced second logical volume to the backup storage device to the request-destination server device. Accordingly, data to be stored in a NAS not locally coupled to a backup device is appropriately backed up.

Abstract: A surface-mount positive temperature coefficient thermistor includes a disk-shaped positive temperature coefficient thermistor element having electrodes provided on opposing main surfaces thereof, an insulating case having an inner space with the thermistor element inserted therein, and a pair of metal terminals arranged to make electrical contact with the respective main surface electrodes of the thermistor element, and to sandwich therebetween the thermistor element. The insulating case includes a pair of main surfaces that are substantially parallel to the main surfaces of the thermistor element, a pair of opening side surfaces each having an opening, and a pair of end surfaces each having a terminal insertion hole provided therein. One end of each of the pair of metal terminals is inserted from the respective terminal insertion holes into the inner space, and the metal terminals press-hold the thermistor element so as to sandwich the thermistor element therebetween.

Abstract: A packet switching system including at least one switching node or local unit each including a label conversion unit for accommodating a plurality of packet circuits and performing conversion into output port information of a switch based on a logic channel on a packet circuit, a self-routing switch for performing switching based on the output port information, and a control unit for terminating a control packet and performing the call processing function. A switching node or tandem unit is provided including at least one self-routing switch for interconnecting the local units. A device is provided for setting, between the tandem unit and a destination-side local unit, the same logic channel as that between an originating-side local unit operative for information transfer and the tandem unit in respect of a call destined for a local unit other than this local unit and a device.

Abstract: There is disclosed a die 1 for forming a honeycomb structure comprises: a plate-like die substrate 2 having at least two surfaces 8, 9, in which back holes 3 for introducing a green material are formed in one surface 8, and slits 4 communicating with back holes 3 are formed in the other surface 9; an underlayer 5 disposed on the substrate 2 so as to coat at least a part of a portion constituting the back hole 3 and the slit 4; an intermediate layer 6 disposed so as to coat at least a part of the underlayer 5 and constituted of tungsten carbide particles whose average particle diameter is 5 ?m or less and containing W3C as a main component; and a surface layer 7 disposed so as to coat at least a part of the intermediate layer 6 and constituted of diamond and/or diamond-like carbon.

Abstract: An ATM switching system comprises a switch unit including a plurality of input ports and a plurality of output ports having the same cell transmission rate, and a multiplexer for multiplexing cell trains outputted from at least two output ports into a single cell train and outputting the cell train to a high-speed output line (and/or a demultiplexer for demultiplexing a cell train from an output port into a plurality of cell trains and outputting the cell trains to a plurality of low-speed output lines). The switch unit includes a buffer memory for temporarily storing cells inputted from the input ports while forming a queue chain for each output line to which each cell is to be outputted, a demultiplexer for distributing the cells read from the buffer memory among the output ports in circulation, and a buffer memory control circuit for controlling the write and read operation of cells with the shared buffer memory.

Abstract: A surface-mount positive temperature coefficient thermistor includes a disk-shaped positive temperature coefficient thermistor element having electrodes provided on opposing main surfaces thereof, an insulating case having an inner space with the thermistor element inserted therein, and a pair of metal terminals arranged to make electrical contact with the respective main surface electrodes of the thermistor element, and to sandwich therebetween the thermistor element. The insulating case includes a pair of main surfaces that are substantially parallel to the main surfaces of the thermistor element, a pair of opening side surfaces each having an opening, and a pair of end surfaces each having a terminal insertion hole provided therein. One end of each of the pair of metal terminals is inserted from the respective terminal insertion holes into the inner space, and the metal terminals press-hold the thermistor element so as to sandwich the thermistor element therebetween.

Abstract: A switching system for integratedly switching voice, data, image information and the like. The switching system comprises a plurality of front-end modules each adapted to perform a switching processing in association with a subscriber line or a trunk line, and a single or a plurality of central modules for interconnecting the plurality of front-end modules in star-type fashion and switching information prevailing between the front-end modules, in unit of block accommodating the information and a header added thereto to contain connection control information and in accordance with the contents of the header. The front-end modules are connected to the central module via inter-module highways each having frames occurring at a predetrmined period and time slots contained in each frame to carry blocks.

Abstract: In a packet switching system-made up of a single or a plurality of switching nodes or local units each including a label conversion unit for accommodating a plurality of packet circuits and performing conversion into output port information of a switch on the basis of a logic channel on a packet circuit, a self-routing switch for performing switching on the basis of the output port information, and a control unit for terminating a control packet and performing the call processing function, and a switching node or tandem unit including a single or a plurality of self-routing switches for interconnecting the local units, there are provided a device for setting, between the tandem unit and a destination-side local unit, the same logic channel as that between an originating, side local unit operative for information transfer and the tandem unit in respect of a call destined for a local unit other than this local unit and a device, operable in the originating-side local unit for information transfer, for inserting

Abstract: An ATM switching system comprises a switch unit including a plurality of input ports and a plurality of output ports having the same cell transmission rate, and a multiplexer for multiplexing cell trains outputted from at least two output ports into a single cell train and outputting the cell train to a high-speed output line (and/or a demultiplexer for demultiplexing a cell train from an output port into a plurality of cell trains and outputting the cell trains to a plurality of low-speed output lines). The switch unit includes a buffer memory for temporarily storing cells inputted from the input ports while forming a queue chain for each output line to which each cell is to be outputted, a demultiplexer for distributing the cells read from the buffer memory among the output ports in circulation, and a buffer memory control circuit for controlling the write and read operation of cells with the shared buffer memory.

Abstract: An ATM switching system including a switch unit having a plurality of input ports and output ports, and a multiplexer for multiplexing cell trains from at least two output ports into a single cell train and outputting the cell train to and output port. A demultiplexer can be provided in place of the multiplexer. The switch unit includes a buffer memory for storing cells from the input ports while forming a queue chain for each output port, a demultiplexer for distributing the cells from the buffer memory to output ports, and a buffer memory control circuit for controlling write and read operations of the buffer memory. The buffer memory control circuit has a control table for outputting an identifier of an output port the cells read from the buffer memory are to be output. Cells are read from the chain designated by the identifier.

Abstract: The optical transmission apparatus for multiple wavelengths according to the present invention comprises; a light source, a temperature control section for controlling the temperature of the light source, a temperature control (ATC) loop for controlling the operation of the temperature control section, and a wavelength control (AFC) loop. The ATC loop detects the temperature of the light source and feedback controls the operation of the temperature control section, so that the optical output wavelengths of the light source fall within a wavelength capture range corresponding to a target wavelength of the AFC loop. The AFC loop has a wavelength detection filter having a periodic transmission wavelength characteristic.

Abstract: A switching system for integratedly switching voice, data, image information and the like. The switching system comprises a plurality of front-end modules each adapted to perform a switching processing in association with a subscriber line or a trunk line, and a single or a plurality of central modules for interconnecting the plurality of front-end modules in star-type fashion and switching information prevailing between the front-end modules, in unit of block accommodating the information and a header added thereto to contain connection control information and in accordance with the contents of the header. The front-end modules are connected to the central module via inter-module highways each having frames occurring at a predetrmined period and time slots contained in each frame to carry blocks.

Abstract: The optical transmission apparatus for multiple wavelengths according to the present invention comprises; a light source, a temperature control section for controlling the temperature of the light source, a temperature control (ATC) loop for controlling the operation of the temperature control section, and a wavelength control (AFC) loop. The ATC loop detects the temperature of the light source and feedback controls the operation of the temperature control section, so that the optical output wavelengths of the light source fall within a wavelength capture range corresponding to a target wavelength of the AFC loop. The AFC loop has a wavelength detection filter having a periodic transmission wavelength characteristic.

Abstract: An ATM switching system comprises a switch unit including a plurality of input ports and a plurality of output ports having the same cell transmission rate, and a multiplexer for multiplexing cell trains outputted from at least two output ports into a single cell train and outputting the cell train to a high-speed output line (and/or a demultiplexer for demultiplexing a cell train from an output port into a plurality of cell trains and outputting the cell trains to a plurality of low-speed output lines). The switch unit includes a buffer memory for temporarily storing cells inputted from the input ports while forming a queue chain for each output line to which each cell is to be outputted, a demultiplexer for distributing the cells read from the buffer memory among the output ports in circulation, and a buffer memory control circuit for controlling the write and read operation of cells with the shared buffer memory.

Abstract: A packet switching system including at least one switching node or local unit each including a label conversion unit for accommodating a plurality of packet circuits and performing conversion into output port information of a switch based on a logic channel on a packet circuit, a self-routing switch for performing switching based on the output port information, and a control unit for terminating a control packet and performing the call processing function. A switching node or tandem unit is provided including at least one self-routing switch for interconnecting the local units. A device is provided for setting, between the tandem unit and a destination-side local unit, the same logic channel as that between an originating-side local unit operative for information transfer and the tandem unit in respect of a call destined for a local unit other than this local unit and a device.

Abstract: A switching system for integratedly switching voice, data, image information and the like. The switching system comprises a plurality of front-end modules each adapted to perform a switching processing in association with a subscriber line or a trunk line, and a single or a plurality of central modules for interconnecting the plurality of front-end modules in star-type fashion and switching information prevailing between the front-end modules, in unit of block accommodating the information and a header added thereto to contain connection control information and in accordance with the contents of the header. The front-end modules are connected to the central module via inter-module highways each having frames occurring at a predetrmined period and time slots contained in each frame to carry blocks.