Abstract: A circuit testing apparatus testing interconnectivity between two integrated circuits including: a data writing unit writing test pattern data for causing the outputting one of the two integrated circuits to perform a predetermined operation into a data buffer of the inputting integrated circuit; and a test control signal generating unit generating a test control signal for causing the inputting integrated circuit to read the test pattern data from the data buffer and provide the test pattern data to the outputting integrated circuit.

Abstract: A transmission rate monitoring apparatus capable of promptly detecting the average transmission rate of data transmitted on a transmission channel. Data is received on the transmission channel, and a desired average transmission rate is set with respect to a predetermined time period. The amount of data received is measured and data is accepted or discarded in accordance with the data amount measured within the predetermined time period and the average transmission rate.

Abstract: A common buffer memory control apparatus controls a common buffer memory which is used to store message data items each of which is divided into a plurality of cells based on an asynchronous transfer mode. The common buffer memory control apparatus includes a free block management table for managing whether each of blocks into which the common buffer memory divided is free or used, a block selecting unit for selecting a block of the common buffer memory which is free with reference to the free block management table, and a cell writing control unit for controlling a write operation for cells of a single message data item so that the respective cells of the single message data item are written in the block, selected by the block selecting means, of the common buffer memory.

Abstract: The present invention relates to a packet transfer communication device. More particularly, the present invention relates to a congestion control unit designed to handle communication at high speed by reducing a load of congestion processing conducted in a core router and an edge router. The congestion control unit includes a packet discarding judgment section that conducts congestion control by a packet discarding judgment based on a smooth queue length which is a quantity of accumulated data composed of a difference between a quantity of input data and a quantity of output data at each predetermined period in a smooth queue length calculating section.

Abstract: The invention relates to a flow controlling apparatus provided in a node of a packet routing network, the flow controlling apparatus performing a rate-based congestion control on packets supplied via an incoming line as well as buffer management. The invention also relates to a node apparatus that incorporates such a flow controlling apparatus. In the flow controlling apparatus and the node apparatus, a frequency at which individual packets belonging to the flows are to be discarded during the course of buffer management are kept, for each flow, at approximately the same value. Therefore, in a network to which the invention is applied, the transmission quality is kept uniform and the service quality is highly maintained while flexible adaptation is made to various service forms.

Abstract: In data insertion control technique; a plurality of buffers hold different types of data, which are to be inserted into a predetermined transmission medium and are equal in insertion priority, and a data insertion controller controls the data insertion order in which the data are to be inserted into the transmission medium by controlling the read process order in which the different types of data are to read from the buffers, based on the write process order in which the different types of data have been stored in the buffers. The result is that it is possible to realize exact data insertion in a minimum delay time.

Abstract: The present invention relates to a packet transfer communication device. More particularly, the present invention relates to a congestion control unit to designed handle communication at high speed by reducing a load of congestion processing conducted in a core router and an edge router.

Abstract: A processor, including a plurality of arithmetic and logic units for processing data for every bit in a word (W) unit, for processing variable length data, preferred for a communication oriented application, excellent in real time operability and a high speed processability, and capable of flexibly coping with changes in function, addition of functions, etc., provided with a processing mask control unit for dividing the data to be processed and data not to be processed, a carry mask control unit for controlling propagation of carry among the arithmetic and logic units, and a bit switch control unit for switching bits between two sets of data to be processed.

Abstract: A transmission rate monitoring apparatus capable of promptly detecting the average transmission rate of data transmitted on a transmission channel. Data receiving means receives data on the transmission channel, and average transmission rate setting means sets a desired average transmission rate with respect to a predetermined time period. Data amount measuring means measures the amount of data received by the data receiving means. Data accepting/discarding means accepts or discards the data received by the data receiving means, in accordance with the data amount measured within the predetermined time period by the data amount measuring means and the average transmission rate.

Abstract: In data insertion control technique; a plurality of buffers hold different types of data, which are to be inserted into a predetermined transmission medium and are equal in insertion priority, and a data insertion controller controls the data insertion order in which the data are to be inserted into the transmission medium by controlling the read process order in which the different types of data are to read from the buffers, based on the write process order in which the different types of data have been stored in the buffers. The result is that it is possible to realize exact data insertion in a minimum delay time.

Abstract: The invention relates to a flow controlling apparatus provided in a node of a packet routing network, the flow controlling apparatus performing a rate-based congestion control on packets supplied via an incoming line as well as buffer management. The invention also relates to a node apparatus that incorporates such a flow controlling apparatus. In the flow controlling apparatus and the node apparatus, a frequency at which individual packets belonging to the flows are to be discarded during the course of buffer management are kept, for each flow, at approximately the same value. Therefore, in a network to which the invention is applied, the transmission quality is kept uniform and the service quality is highly maintained while flexible adaptation is made to various service forms.

Abstract: In data insertion control technique; a plurality of buffers hold different types of data, which are to be inserted into a predetermined transmission medium and are equal in insertion priority, and a data insertion controller controls the data insertion order in which the data are to be inserted into the transmission medium by controlling the read process order in which the different types of data are to read from the buffers, based on the write process order in which the different types of data have been stored in the buffers. The result is that it is possible to realize exact data insertion in a minimum delay time.

Abstract: A useful pyroelectric infrared detector capable of cancelling noises and detecting dead angles, and accurately detecting a moving direction of a moving body is provided. Four sensing electrodes having an identical shape, area, and sensitivity are formed on a surface of a pyroelectric member in an L-shaped form, so that they are arranged to differ by 90 degrees in phase, respectively, but are symmetric about a center of rotation. The four sensing electrodes form two pairs of dual detecting elements so that output may be provided from the respective first and second dual elements I and II and be appropriately processed.

Abstract: A measuring instrument that must transmit predetermined wavelengths of optical radiation has an optical filter assembly that can be conveniently manufactured. The optical filter assembly can be coated to provide optical coatings on either side of the substrate, and a masking layer can be deposited to encompass the peripheral edges of the optical coatings and exposed portions of the substrate to eliminate the problem of optical noise resulting from optical radiation contact with the edges of the coating layers.

Abstract: An infrared ray detector assembly for detecting a plurality of components such as hydrocarbons, CO.sub.2 and CO gases includes a housing member having a hollow interior and a portion transmissible to infrared rays and a holder member mounted within the hollow interior and having a plurality of separate compartments. An infrared detector is mounted in each compartment, and an optical filter is mounted over each compartment, abutting adjacent filters to respectively limit the wavelength band to each infrared detector, each optical filter having a substrate of approximately the same material and thickness.

Abstract: A method for fixing a window member having a layer of electrically conductive material to a can of an infrared detector over an incident opening extending through a surface of the can is performed by adhering the window member to the can with a non-conductive adhesive applied between an end surface and a side circumferential surface of the window member and a surface of the casing while leaving a portion of the side circumferential surface, formed by the electrically conductive material layer, partially exposed, masking an opposing end surface of the window member and then covering the result with a thin film of electrically conductive material part of which extends between the exposed side circumferential surface of the electrically conductive material layer of the window member and the surface of the can. Finally, the mask and the portion of the thin film of electrically conductive material covering the mask are removed.