Canon Kabushiki Kaisha

Kazuhiko Morimura

Masashi Kamada

Takayuki Ninomiya

Jun Kawashima

Kenichi Morikawa

Yuji Akiyama

Toshiharu Inui

Midori Yasuda

Noribumi Koitabashi

Hitoshi Nishikori

Sadayuki Sugama

Makoto Torigoe

Daisuke Shiraishi

Masashi Matsumoto

Masaya Uetuki

Yasuhiro Unosawa

Fumiyuki Mikami

Ken-ichi Morikawa

A communication apparatus requests, to a network, allocation of a first network slice for executing predetermined processing required when executing a communication service executed by the communication apparatus and allocation of a second network slice for the communication service, supplies a result of the predetermined processing executed in the first network slice for communication in the second network slice, and performs communication by using the result of the predetermined processing in the second network slice.

Communication apparatus, communication method, and storage medium

A communication device includes a first communication interface for a first transmission path, a second communication interface for a second transmission path, a control unit that controls a communication path internal to the communication device of a signal received by the first communication interface, and a processing unit that performs predetermined processing on the received signal, wherein the control unit performs control to output, in a case where the communication device is in a first state, the received signal to the second communication interface via the processing unit, and output, in a case where the communication device is in a second state, the received signal to the second communication interface by bypassing the processing unit.

Performing network communication regardless of state of network connected device

A communication apparatus extracts segment data including information defining the position of a fragment packet before fragmentation and the identification information of the fragment packet from the header information of the fragment packet. If the fragment packet is the last fragment packet, the apparatus extracts packet length information before packet fragmentation from the header information of the last fragment packet. A memory stores a segment database holding segment data and information associating identification information with packet length information. The communication apparatus executes integration processing of the segment data based on information stored in the segment database and determines whether the reception of all the fragment packets constituting the packet before fragmentation is complete.

Communication apparatus, processing method for the same, and computer-readable storage medium

A packet receiving apparatus determines whether or not data to be stored in a buffer overlaps previously stored data based on information contained in a header portion of a received packet. If it is determined that the data overlaps, a checksum for the overlapping data is subtracted. If it is determined that the data does not overlap, a checksum for the data to be stored in the buffer is added.

Packet receiving apparatus and processing method for the same

A transmission apparatus that transmits data according to a protocol has a timer, a memory, a processor, and a transmission unit. The processor stores, in the memory, type data indicating a single type of time from a plurality of types of time that are to be measured according to the protocol. The transmission unit transmits data according to the protocol and starts the measurement of time of the type indicated by the type data stored in the memory using the timer after the data has been transmitted.

Transmission apparatus that transmits data according to a protocol, and method for measuring time in the transmission apparatus

A switching apparatus includes an identification device for identifying received real-time packets; a measurement device for measuring a reception interval of the real-time packets according to the identification identified by the identification device; and an output device for giving priority to the real-time packets over other types of packets and outputting the real-time packet by priority based on the measurement measured by the measurement device.

Switching apparatus for switching real-time packet in real time and packet switching method

A delay in packet output due to packet fragmentation processing is reduced. If input data is output upon being subjected to fragmentation processing, fragmented data, from among a plurality of fragmented data items fragmented based upon a set value in an MTU register, which belongs to a first fragmented packet containing information that is based upon all fragmented packets is stored in a fragment buffer. After all fragmented packets from a second fragmented packet onward to which other fragmented data items belong are output, the first fragmented packet is output.

Communication apparatus and method

This invention provides a transmission system and control method capable of reliably transmitting real-time data. A switching device and router each serving as an intermediate device mediate an iso-data packet sent from each iso-data server to a predetermined terminal at a timing designated by an iso-packet from the iso-server. If a plurality of iso-data packets conflict in the transmission path, the switching device and router collectively continuously output the plurality of iso-data packets.

Transmission system and control method

A communication control device comprises a calculation part for calculating the number of frames and the frame length for transmitting the transmit data, a payload division part for dividing the transmit data into frame units based on the calculation results of the calculation part, and a header generation part for generating a header to be appended to the transmit data of frame unit based on the calculation results of the calculation part in the midst of dividing the transmit data by the payload division part. Thereby, the parallel processing ability of the hardware can be exhibited, a memory management method can be simplified, and the transmit data can be outputted as the frame at high speed.

Communication control device and communication control method

Frames of different priority levels are queued in a plurality of queues, e.g., first priority queue, second priority queue and third priority queue. If it is judged that a lower priority frame can be completely transmitted by the timing of transmitting a higher-priority frame based on the frame length, the lower-priority frame is transmitted, and otherwise, the lower-priority frame is not transmitted. Accordingly, frame transmission control that is applicable to fixed-length frames and variable-length frames is realized in a frame scheduler for an apparatus having a function of outputting frames. Also, priority-based control of frames which is suitable for a layer 2 switch or the like and which is adaptable to processing in a high-speed network is realized without providing an IP fragment.

Communication apparatus for transmitting frames and priority control method for transmitting frames

A host computer acquires information about an amount of remaining ink of a printer. In response to the acquired information about the amount of remaining ink, the host computer displays a message on a display screen so that a user can select whether an ink cartridge is to be replaced with a new one or the process is to return to a previous routine without replacing the ink cartridge.

Information processing apparatus which obtains information concerning residual ink amount from an attached ink jet printer

A bus arbiter capable of avoiding needless increase in circuit scale is provided. The bus arbiter controls a bus shared by a CPU (central processing unit) and a plurality of apparatuses for generating addresses. The bus arbiter includes a determination unit for determining if a request of an address is a request of an address where no corresponding device is present, and a processor for passing the request by transmitting an ACK signal without performing a writing operation for a request of a writing operation, and transmitting dummy data and an ACK signal without performing a reading operation for a request of a reading operation, when the determination unit has determined that the request is a request of an address where no corresponding device is present.

Bus arbiter

A recording apparatus records at a higher density than the density of arranged recording elements of a recording head by interlace recording. A scanning section makes the recording head sub-scan in order to enable the recording head to interlace record between lines of dots recorded in main scannings. A read-out section reads out the same recording data from a memory two or more times. With every reading of the recording data, a selector complementarily selects recording data from the recording data read out from the memory and supplies the selected recording data to the recording head.

Interlace recording apparatus and method

Bus arbiter operable as a DRAM controller

According to the present invention, there is provided an ink jet recording apparatus for recording an image on a recording medium by discharging ink to the surface of the recording medium, wherein ink is reserved in an ink tank including a negative pressure generating member, such as an absorber and a foaming member, and a function of accurately detecting the residual quantity such that depletion to a predetermined level can be detected is realized. Light emitted by a photointerrupter is allowed to pass through a portion of a wall surface of the ink tank made of transparent plastic or the like which is transmissible with respect to detection light emitted by the photointerrupter to detect change in the light reflectance in the boundary portion between the wall surface and the ink absorber. In accordance with reflectance obtained in a case where no ink exists in the detected portion and that obtained in a case where ink exists, the residual quantity of ink can be detected.

Growing community of inventors

Tokyo, Japan

Kazuhiko Morimura