Abstract: A communication apparatus contains a first table having entries each storing a data-link-layer path to a second communication apparatus, and a second table storing a pointer to the entry of the first table, storing the data-link-layer path to the second communication apparatus, corresponding to a network-layer address of one of the at least one other communication apparatus. In addition, a process for determining layer-2 reachability between first and second communication apparatuses, identifies first and second layer-2-connected communication networks to which first and second interfaces of first and second routers are connected, where, on a layer-3 communication path between the first and second communication apparatuses, the first router is located nearest the first communication apparatus and the second router is located nearest the second communication apparatus. When first and second layer-2-connected communication networks are identical, the layer-2 reachability is determined.

Abstract: In an atomic oscillator, a high-frequency converting circuit converts the output of a standard oscillator into a high frequency signal such that the frequency of the high frequency signal multiplied by a low natural number equals an atomic resonant frequency signal. The high frequency signal is then multiplied by a low natural number in an active, low-natural-number multiplier circuit to convert the output frequency of the standard oscillator into a resonant frequency to be input to the atomic oscillator. The result is that, without using a passive, high-natural-number multiplier circuit, such as a varactor diode, which is expensive, it is possible to convert the output frequency of the standard oscillator into a resonant frequency signal of a rubidium atom, thus downsizing the circuits of the atomic oscillator and reducing the term and cost of manufacture.

Abstract: This invention discloses a chuck apparatus actuated by a fluid including a body, a plurality of master jaws slidably mounted in the body, a fluid driven piston mounted for axial motion relative to the body along an axis, the piston comprising a plurality of bores extending therethrough along bore axes inclined with respect to the axis, and a plurality of shafts, each slidably mounted in one of the plurality of bores and being coupled to one of the master jaws, and wherein axial movement of the piston along the axis causes the plurality of shafts to move and to cause the plurality of master jaws to move therewith.

Abstract: A transmission system for transmitting a data signal with an analog passband signal through a analog transmission line. The data signal is transformed to a signal representing a descrete data signal point in a vector signal space. The analog passband signal is transformed to a base band signal, and the base band signal is superimposed on the signal representing a descrete data signal point. A signal representing the superimposed data signal point is modulated and transmitted through the analog transmission line. In a receiver, the data signal point is decided from the signal representing the superimposed data signal point, and the superimposed bass band signal is extracted by subtracting the decided result from the signal representing the superimposed data signal point. The base band signal is transformed to the analog passband signal. A portion of information carried by the analog passband signal may be converted to a digital signal, and the digital signal is multiplexed with the data signal.

Abstract: A display control system for a videoconference terminal capable of displaying proper images of participants. A video camera captures wide-angle source pictures including the images of participants. The source pictures are sent to a participant position detector and image clipping unit. The participant position detector detects a participant position by examining the source pictures. Depending on the on-screen movement observed in the participant position detected by the participant position detector, the image clipping unit determines an appropriate clipping window. It clips the desired image out of the source pictures as defined by the clipping window. A screen adjustment unit adjusts the image size so that it will fit to the actual screen size.

Abstract: The present invention provides a switching system capable of providing an ACD service while educating operator. The control part in the switching system, when being requested to establish an ACD call, selects a responsible main-operator terminal among plural responsible main-operator terminals and controls the switching part and the MXT in a manner that the selected main-operator terminal receives the ACD call, and selects a responsible sub-operator terminal among plural responsible sub-operator terminals and controls the switching part and the MXT in a manner that information transmitted with the established call can be listened by using the selected sub-operator terminal.

Abstract: One matrix board aggregate accommodating two matrix boards is made one unit of a switch. Three of the matrix board aggregates are vertically located, groups of such three vertically-located matrix board aggregates are laterally located and robots are provided between the matrix board aggregates. By providing a number of robots, the switch operation speeds up. The robots are controlled by a control circuit/power supply RMC/POW. I/O cables for connecting an MDF apparatus to an exchange or to lines are provided at the back. In a three-stage switching configuration, by devising the location of primary, secondary and tertiary switches, interconnection between matrix board aggregates can be made using BWBs made of a printed wiring board.

Abstract: In a signal amplifying circuit connected to a transfer circuit having a known non-linear transfer characteristic and a transient characteristic, a threshold generation circuit generates a threshold signal based on an input signal, a threshold control circuit controls the threshold signal so as to correct the non-linear transfer characteristic of the transfer circuit provided at a former stage based on the input signal. Also, basic amplifying circuit blocks can be connected in a multistage form, each of which is composed of a threshold generation circuit and a differential amplifying circuit, and control the threshold signal of a latter stage block so as to correct the non-linear transfer characteristic of a basic amplifying circuit block at a former stage based on the input signal.

Abstract: In a control device for a storage device in which data streams are respectively divided into unit data, which are distributed to storage parts and are sequentially read therefrom for every unit data, there is provided a buffer memory which stores data to be written into the storage parts and data read from the storage parts. An input/output control part causes the unit data from the storage parts in an access cycle corresponding to a bit rate to be stored in the buffer memory and causes the unit data stored in the buffer memory at the bit rate to be written into the storage parts. An input/output interface part reads the unit data from the buffer memory at the bit rate and causes the data transferred at the bit rate to be stored in the buffer memory.

Abstract: A high-speed network printer apparatus which can be used in common by clients having different communication protocols and which can sort out printing jobs into the order of clients. Printing information is supplied from a client which may be a personal computer or a work station through a connector of the printer apparatus. A LAN interface driver receives the printing information and identifies a communication protocol by which the printing information is transferred. A communication protocol controller receives printing information in accordance with a predetermined protocol. A spooling controller, which is coupled to a storage unit which stores the received printing information, creates a queue for printing jobs. A printer controller reads out from the storage unit the printing information corresponding to a printing job of the highest priority which is designated by the queue, and forms a dot image on the basis of the printing information. A printing mechanism prints the image on paper.

Abstract: It is an object of the present invention to, in the music data processing apparatus, reduce the complex processings in each of the computing units and access to the shared region of the main memory unit and to generate more efficiently the music data. According to the music data processing apparatus, the computing units (31) to (33) of the operating device unit (2) perform specified operations on data necessary for generating music that is stored in a main memory (3) and store “1” as the respective flags indicating the completion of the operating process in a synchronization notification information designating part (9) of the main memory (3).

Abstract: A positioning system for obtaining information concerning a current position of a device even when one is in an underground center or inside a building includes a portable terminal is equipped with a radio-call-reception part having a radio-call-reception function that is a receiving unit which receives data sent from the base station and a positioning function to obtain the primary position data indicating the current position of the device based on data sent from the base station, a GPS-reception part having a positioning function to obtain the secondary position data on measuring the current position of the device based on signals sent from GPS satellites, and a position-data-correction function to correct the secondary position data using the position-correction data sent from the base station, and an information-processing part having a function to perform information processing using position data obtained from the radio-call-reception part and the GPS-reception part.

Abstract: An exchange identifies a destination telephone number dialed by a subscriber, accesses a database access unit to determine whether the subscriber performs data communication or speech communication based on the identified destination telephone number, suspends a call waiting service when the subscriber performs data communication service and activates the call waiting service when the subscriber performs speech communication.

Abstract: The first input route information with a virtual path identifier, a virtual channel identifier and a line identifier set in the header of an input cell is compressed, and a base address with a lower number of bits than the input route information is generated from a part of the second input route information selected by the compression using a first conversion table. Then, third data consisting of both the base address and a part of the second input route information other than the part of the second input route information selected by the compression are generated, and the third data are converted to a routing tag using a second conversion table.

Abstract: In an optical subscriber network system which connects plural optical network units to an optical service unit using passive optical elements through an optical transmission line, the optical transmission line is duplexed with a lower cost. The optical service unit and the optical network units each have plural transmission-reception portions the wavelengths of which are different from each other, and the inputs and outputs of the plural transmission-reception portions are multiplexed with the wavelengths (WDM) into a single optical transmission line to form a pseudo redundant communication path between the optical service unit and the optical network units. The communication which uses a certain wavelength between the optical service unit and the optical network units is active, and the communication which uses another wavelength is a standby. When the active communication has a fault, a switchover operation to the standby communication is performed.

Abstract: There is provided an online program-updating system which is capable of updating contents of a program without interrupting any services provided by the system. A management information storage section stores management information including operative status flags each indicative of the operative status of a corresponding program module and information of a version number associated with the corresponding program module. A program execution section updates operative status flags based on the operative statuses of the program modules. A version number check section makes a comparison between the version number of each program module of a revised program and that of each program module of the existing program in response to a download request, and determines that an update of the program is required, if the version number of the program module of the revised program is newer.

Abstract: The invention provides an optical subscriber network system which can secure dual construction of optical transmission/reception sections of optical network units, specification of a failed faulty point in optical transmission lines and reception circuits of the optical network units and regular timing transmission of upstream data. The optical subscriber network system has a passive optical network construction wherein a plurality of network units are accommodated in a station apparatus through an optical transmission line using a passive optical element, and includes bypass transmission lines for mutual supervision control between the network units. A network unit mutual supervision control signal is communicated between the network units through the bypass transmission lines.

Abstract: A transmission system comprises a plurality of transmission apparatuses which use a single channel commonly. Each transmission apparatus comprises switches for connecting and disconnecting transmission paths with adjacent transmission apparatuses, a line signaling-signal monitoring and detecting portion, and a network dividing logic portion which opens and closes the switches based on an output of the line signaling-signal monitoring and detecting portion. The network dividing logic portion closes switches of transmission paths between transmission apparatuses which perform a telephone conversation and opens the other switches.