Abstract: A motor drive apparatus which drives a motor by controlling conduction/non-conduction of a drive transistor for causing a current to flow through a drive coil of the motor based on a pulse signal indicating a relative position between the rotor and stator of the motor, generated by a position detector, and on a rotation speed setting voltage for setting the rotation speed of the motor. The apparatus comprises a control circuit that generates a pulse-delayed signal by delaying the pulse signal by delay time according to the voltage level of the rotation speed setting voltage.

Abstract: A blade-type optical transmission apparatus includes a plurality of main-signal blades, each of which is provided with an external optical signal interface unit, a cross-connect unit, and an internal optical signal interface unit, a blade enclosure in which the plurality of main-signal blades are enclosed, and a back plane which is situated inside the blade enclosure and provides a ring connection for the internal optical signal interface unit between the main-signal blades.

Abstract: A packet transmission system is disclosed. The system serves between terminal apparatuses that include a supervisory control circuit configured to transmit a supervisory signal in a direction opposite to the transmission direction of a main signal on each of and both of an upstream circuit and a downstream circuit. The packet transmission system transmits overhead information of a packet frame of the main signal of the upstream circuit and the downstream circuit using the supervisory control circuit of the downstream circuit and the upstream circuit, respectively.

Abstract: A network synchronization controller and method for effectively preventing a timing loop from happening in a synchronous network. A clock status message controller, disposed in each network element on the network, produces and sends clock status messages which are each composed of clock quality data and synchronization control data. The clock quality data indicates the quality level of a clock signal that each network element supplies to its neighboring network elements. The synchronization control data contains information to be used to make the network synchronized with a single reference timing source. A clock selector chooses one of the clock signals received from other network elements, based on the clock status messages received along with the clock signals.

Abstract: In a method for transmitting data from a first node to a second node through an interlinking network including data transmission equipments: the data is transmitted from the first node to one of the data transmission equipments together with a first request for storage of the data in the one of the data transmission equipments; the data is stored in a storage unit provided in the one of the data transmission equipments in response to the first request; a second request for the data is transmitted from the second node to the one of the data transmission equipments; the data is read out from the storage unit in response to the second request; and the data is transmitted from the one of the data transmission equipments to the second node.

Abstract: Disclosed herein is a SONET/SDH transmitter provided in a transmission system in which a SONET/SDH network and an IP network are connected with optical LAN-IF. The SONET/SDH transmitter has a redundancy transmission line structure consisting of two transmission lines, a K-packet processing section, and a transmitting section. The K-packet processing section is used for generating a specific byte (SONET K1/K2 byte) of data representing transmission-line switching control information about the transmission lines, packetizing the generated data, and outputting a packet. The transmitting section is used for transmitting the packet to the transmitter provided opposite through the transmission lines. This SONET/SDH transmitter further has a redundancy line switching section.

Abstract: Proposed is an optical clock distribution system in the WDM network, which particularly relates to a system to control clock synchronization between optical transmission devices constituting an optical communication network. The optical clock distribution system includes an optical clock generator converting a clock signal of PRC (Primary Reference Clock) level into an optical clock signal having a wavelength &lgr;0; a wavelength multiplexer wavelength-multiplexing the optical clock signal having wavelength &lgr;0 together with other optical wavelength data; and a wavelength-demultiplexer provided in a unit of the network, wavelength-demultiplexing the optical clock signal having wavelength &lgr;0, wherein the other optical wavelength data are processed in the unit of the network using the wavelength-demultiplexed optical clock signal having wavelength &lgr;0 as a reference clock.

Abstract: Fee imposition system and method for application software, in which a software providing corporation can collect the fee without fail and charge a fair fee to a customer, and thereby the customer can use the application software with a paying method easy to estimate. The fee imposition system includes a server machine installed in a management center for managing the software, a client machine installed in a customer's office and connected with the server machine through a communication means, a ticket issue unit for issuing a ticket file on the basis of a predetermined fee schedule, and a data copy/writing unit for copying data corresponding to the information designated by the ticket file from a data source memory unit and recording the copied data on a data target memory unit.

Abstract: Fee imposition system and method for application software, in which a software providing corporation can collect the fee without fail and charge a fair fee to a customer, and thereby the customer can use the application software with a paying method easy to estimate. The fee imposition system includes a server machine installed in a management center for managing the software, a client machine installed in a customer's office and connected with the server machine through a communication means, a ticket issue unit for issuing a ticket file on the basis of a predetermined fee schedule, and a data copy/writing unit for copying data corresponding to the information designated by the ticket file from a data source memory unit and recording the copied data on a data target memory unit.

Abstract: A wavelength division multiplexing transmission device includes a multiplexer part which multiplexes a plurality of first signals having a first bit rate and different wavelengths into a second signal having a second bit rate higher than the first bit rate and inserts wavelength data information concerning the different wavelengths into the second signal.

Abstract: A transmission apparatus includes an input port part having a plurality of input ports, an output window part having a plurality of buffers, a switch part making connections between the plurality of input ports and the plurality of buffers, a selection control circuit controlling the switch part so that data from the plurality of input ports are stored in buffers that have available areas among the plurality of buffers in accordance with data storage states of the plurality of buffers, and a time division multiplexing part multiplexing the data read from the plurality of buffers in time division multiplexing for transmission.

Abstract: A communication node comprises a backplane transmission circuit capable of accomplishing transmission of a signal between communication units installed in a plurality of slots and a signal waveform control unit for controlling a waveform of the signal in accordance with a transmission distance of the signal between the communication units in the backplane transmission circuit. This arrangement achieves stable fast backplane transmission of a main signal without increasing the degree of parallelism for the main signal, thus realizing a high-extensibility small-sized communication node capable of dealing with as a very-high large-capacity bit rate as 40 Gbps, 160 Gbps or a bit rate exceeding these values.

Abstract: In order to increase the efficiency of large-capacity transmission, the continuity of divided signals generated by dividing a multiplexed signal is maintained and the original large-capacity multiplexed signal is restored. A signal dividing section divides a multiplexed signal to generate a plurality of divided signals in the STS or STM transmission interface format. A guarantee information adding section adds guarantee information for guaranteeing the continuity of the divided signals to each of the divided signals to generate transmission signals. A signal sending section sends the transmission signals via a transmission line in the transmission interface format. A signal receiving section receives the transmission signals. A signal restoring section restores the multiplexed signal by constructing the divided signals on the basis of the guarantee information.

Abstract: In a mesh-type network, a managing section manages QoS (Quality of Service) information, which is accumulated QoS information (inter-neighboring-node QoS information q) between neighboring node apparatuses, about QoS for candidate signal transmission routes in the network at the individual node apparatuses. And a control section controls a signal transmission route selection operation at the self node apparatus based on the network QoS information Q being managed by the managing section. With this construction, it is possible to set/manage a line route satisfying a desired QoS independently at the individual node apparatuses with maximum ease and flexibleness.

Abstract: A calibrating device is composed of a movable portion having a degree of freedom movable in three axis directions orthogonal to each other, a displacement detector for detecting displacement of said movable portion as per degree of freedom, a universal joint having a three-axis rotating degree of freedom, which is attached to the tip end portion of said movable portion, a fixture attached to a free end of the universal joint, which is capable of being easily connected to the tip end portion of the wrist of the robot. The calibrating device measures displacement of the wrist tip end portion. That is, the invention provides a comparatively simple calibrating device and a calibrating method, in which automation is easy without requiring any complicated operations, using the calibrating device.

Abstract: A direct teaching apparatus which allows an operator to perform the direct teaching of a robot in safety. The apparatus includes a force detector and a teaching tool. The tool includes a working tool or handle fixed to the first detector and held by the operator to lead the robot. It also includes a device for computing the position or speed directive based on the force detector data and a motion model. It further includes a device for computing the generation torque of a motor for driving a robot depending on the position or speed directive and a controller to control the generated torque.