Patents by Inventor Atsuki Taniguchi
Atsuki Taniguchi has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 7359316Abstract: The present invention is a technology concerning a reception pointer processing in an SDH transmission system. The objects of the invention are to identify automatically a frame size (frame composition) of the received transmission frame in the SDH (SONET) transmission system and to perform flexibly and rapidly a reception pointer processing corresponding to the frame size.Type: GrantFiled: July 13, 2000Date of Patent: April 15, 2008Assignee: Fujitsu LimitedInventors: Kenji Fukunaga, Takumi Iwai, Atsuki Taniguchi, Kazuo Takatsu
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Patent number: 6895182Abstract: An optical transmission technique for a ring transmission system that can transmit time-division-multiplexed optical signals in dual directions. An optical transmitting apparatus comprises a data link reading section, a topology creating section, a data link writing section, a squelch table creating section, a squelch table, an RIP table creating section, an RIP table, a node recognizing section, an east-side receiving unit, an east-side transmitting unit, a west-side transmitting unit, and a west-side receiving unit. When a transmission route is switched at plural positions, the squelch table and the RIP table are automatically created as soon as a crossconnect is set. With minimum setting, the ring transmission system can be normally operated without increasing the number of setting items, the squelch table can be created at a high speed using existing hardware, and an alarm can be automatically transmitted from a secondary node until each table is created.Type: GrantFiled: October 24, 2000Date of Patent: May 17, 2005Assignee: Fujitsu LimitedInventors: Junichi Moriyama, Tsutomu Chikazawa, Yoshihisa Ikeda, Takanori Yasui, Atsuki Taniguchi, Masahiro Shioda
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Patent number: 6763038Abstract: In a light transmission equipment which can generate a desired concatenation signal from a maximum concatenation signal standardized in a synchronous transmission mode, a master and a slave circuit for clock change are provided respectively inputting at least two data at a maximum transmission rate based on a concatenation standard of a synchronous transmission mode obtained by dividing a desired transmission rate not prescribed in the concatenation standard to perform a concatenation control to the slave circuit by control information from the master circuit side.Type: GrantFiled: March 28, 2000Date of Patent: July 13, 2004Assignee: Fujitsu LimitedInventors: Nobuhiko Usui, Koji Matsunaga, Masayuki Maehira, Tatsuya Toyozumi, Yumiko Ogata, Masahiro Shioda, Atsuki Taniguchi
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Patent number: 6728925Abstract: In an error correcting method and an apparatus therefor using Hamming codes, a frame regulated by a synchronous network is divided into L blocks in the direction of row. Preferably, information bits and check bits are allocated to a payload portion and non-defined bits of an LOH portion, respectively. More preferably, the information bits and the check bits are divided into M sub blocks to form a Hamming code block. In addition, a code error correcting means rearrange each Hamming code block per bit and further preferable, a syndrome register with a plurality of banks operates an error syndrome of the Hamming code block, and based on the operation result, the code error correction of the Hamming code block is performed by a bank switchover.Type: GrantFiled: May 25, 1999Date of Patent: April 27, 2004Assignee: Fujitsu LimitedInventors: Junichi Ishiwatari, Atsuki Taniguchi, Masahiro Shioda, Takashi Kuwabara, Yukio Yamazaki
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Patent number: 6674771Abstract: In a transmission method and apparatus, low-speed SDH signals are multiplexed into a high-speed SDH frame, the high-speed SDH frame including at least an information payload, a line overhead and a section overhead, the section overhead being divided into a first section overhead SOH and a second section overhead SOH, the first SOH carrying regenerator SOH bytes and the second SOH carrying multiplex SOH bytes. The multiplex SOH bytes in the second SOH of the high-speed SDH frame are detected without changing the line overhead and the payload when the high-speed SDH frame reaches a receive-side high-level line terminating equipment. The multiplex SOH bytes in the second SOH of the high-speed SDH frame are generated without changing the line overhead and the payload before the high-speed SDH frame is transmitted by a transmit-side high-level line terminating equipment.Type: GrantFiled: November 29, 1999Date of Patent: January 6, 2004Assignee: Fujitsu LimitedInventor: Atsuki Taniguchi
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Publication number: 20030061562Abstract: In an error correcting method and an apparatus therefor using Hamming codes, a frame regulated by a synchronous network is divided into L blocks in the direction of row. Preferably, information bits and check bits are allotted to a payload portion and an LOH portion of non-defined bits. More preferably, the information bits and the check bits are divided into M subblocks to form a Hamming code block. In addition, a code error correcting means rearrange each Hamming code block per bit and further preferably, a syndrome register with a plurality of banks operates an error syndrome of the Hamming code block, and based on the operation result, the code error correction of the Hamming code block is performed by a bank switchover.Type: ApplicationFiled: May 25, 1999Publication date: March 27, 2003Inventors: JUNICHI ISHIWATARI, ATSUKI TANIGUCHI, MASAHIRO SHIODA, TAKASHI KUWABARA, YUKIO YAMAZAKI
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Patent number: 6496518Abstract: The present invention relates to an SDH transmission technique. In an SDH transmission system including a plurality of SDH transmission units for multiplex relay and one SDH transmission unit for relay, with a desired network formed by the respective SDH transmission units, the SDH transmission system is provided with a relay section for a communication carried out between the SDH transmission unit and the SDH transmission unit, or between the SDH transmission units, a multiplexing section for a communication carried out between the transmission units, and a network section for a desired communication carried out irrespective of the multiplexing section and the relay section in the above network. It is thereby possible to freely carry out a desired communication in the network irrespective of the relay section and the multiplexing section which are defined in an SDH transmission mode.Type: GrantFiled: July 20, 1998Date of Patent: December 17, 2002Assignee: Fujitsu LimitedInventor: Atsuki Taniguchi
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Patent number: 6456587Abstract: A ring transmission system of a bidirectional line switched ring (BLSR) type comprising nodes (A) to (F) connected by ring transmission lines RL, wherein the nodes (A) to (F) have modified squelch tables [A] to [F] and squelch decision units. The ring topology is built by transmitting a ring topology frame and inserting the ID of each node in that frame. Each of the nodes creates a modified squelch table comprised of modified node IDs given to the nodes in a rising order of connection starting from itself using itself as “0” or another reference value. Whether or not to perform a squelch operation is determined by comparing the magnitude of the modified node IDs of the nodes which signals cannot reach at the time of occurrence of a failure and the modified node IDs in the modified squelch table. This enables the squelch processing to be performed at a high speed.Type: GrantFiled: January 5, 2000Date of Patent: September 24, 2002Assignee: Fujitsu LimitedInventor: Atsuki Taniguchi
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Publication number: 20020101865Abstract: 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.Type: ApplicationFiled: July 13, 2001Publication date: August 1, 2002Inventors: Yoshinobu Takagi, Hirotaka Morita, Chiyoko Komatsu, Miyashita Takuya, Atsuki Taniguchi
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Publication number: 20020009091Abstract: A ring transmission system of a bi-directional line switched ring (BLSR) type comprising nodes (A) to (F) connected by ring transmission lines RL, wherein the nodes (A) to (F) have modified squelch tables [A] to [F] and squelch decision units. The ring topology is built by transmitting a ring topology frame and inserting the ID of each node in that frame. Each of the nodes creates a modified squelch table comprised of modified node IDs given to the nodes in a rising order of connection starting from itself using itself as “0” or another reference value. Whether or not to perform a squelch operation is determined by comparing the magnitude of the modified node IDs of the nodes which signals cannot reach at the time of occurrence of a failure and the modified node IDs in the modified squelch table. This enables the squelch processing to be performed at a high speed.Type: ApplicationFiled: January 5, 2000Publication date: January 24, 2002Inventor: ATSUKI TANIGUCHI
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Patent number: 6337848Abstract: Two alarm detecting units required as alarm detecting units for controlling a PSW in order to implement a PSR function, are deleted, and instead the result of an alarm detection output by a conventional alarm detecting unit (E-THRU) for a BLSR function is cross-connected in units of STS-1 frames by an alarm TSA apparatus (E-DROP). In the same way, the result of an alarm detection output by an alarm detecting unit (W-THRU) is cross-connected in units of STS-1 frames by an alarm TSA apparatus(W-DROP). These two cross-connected alarms are compared by a comparing unit (DROP). Based on the result of the comparison the PSW is controlled.Type: GrantFiled: March 17, 1998Date of Patent: January 8, 2002Assignee: Fujitsu LimitedInventors: Kazuo Takatsu, Atsuki Taniguchi
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Patent number: 6130764Abstract: In a transmission apparatus in a ring network, provided are a demultiplexing section for demultiplexing multiplexed transmission signals and outputting thus demultiplexed signals; a branching and inserting section adapted to cause, of the demultiplexed transmission signals, a transmission signal of a desired channel to branch out into another line and insert a signal from another line as a transmission signal into the channel from which the transmission signal branches out; and a multiplexing and transmitting section for multiplexing the transmission signals from the branching and inserting section and transmitting thus multiplexed signal as a multiplexed transmission signal to a line which becomes a relaying destination of transmission; wherein the branching and inserting section comprises a transmission route setting mechanism for setting a transmission route of each set of transmission signals such that each set of the transmission signals are transmitted by one of a plurality of kinds of transmission systType: GrantFiled: March 4, 1998Date of Patent: October 10, 2000Assignee: Fujitsu LimitedInventor: Atsuki Taniguchi
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Patent number: 6122250Abstract: A ring transmission system of a bi-directional line switched ring (BLSR) type comprising nodes (A) to (F) connected by ring transmission lines RL, wherein the nodes (A) to (F) have modified squelch tables [A] to [F] and squelch decision units. The ring topology is built by transmitting a ring topology frame and inserting the ID of each node in that frame. Each of the nodes creates a modified squelch table comprised of modified node IDs given to the nodes in a rising order of connection starting from itself using itself as "0" or another reference value. Whether or not to perform a squelch operation is determined by comparing the magnitude of the modified node IDs of the nodes which signals cannot reach at the time of occurrence of a failure and the modified node IDs in the modified squelch table. This enables the squelch processing to be performed at a high speed.Type: GrantFiled: September 11, 1996Date of Patent: September 19, 2000Assignee: Fujitsu LimitedInventor: Atsuki Taniguchi
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Patent number: 6118795Abstract: The present invention is a technology concerning a reception pointer processing in an SDH transmission system. The objects of the invention are to identify automatically a frame size (frame composition) of the received transmission frame in the SDH (SONET) transmission system and to perform flexibly and rapidly a reception pointer processing corresponding to the frame size.Type: GrantFiled: July 21, 1997Date of Patent: September 12, 2000Assignee: Fujitsu LimitedInventors: Kenji Fukunaga, Takumi Iwai, Atsuki Taniguchi, Kazuo Takatsu
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Patent number: 5909175Abstract: A connection switching circuit is disposed in each node of a ring system in which a first ring and a second ring are provided with two communication lines which allow data to flow in a different direction respectively and is connected with a currently used passage and preliminary passage. The connection switching circuit comprises an alarm correction reading part for generating a control signal, an alarm monitor part for outputting respective alarm detection signals, a currently used/and preliminary alarm recognition part, and a switching control signal generation part for generating a control signal for selecting a passage, wherein either the currently used passage or the preliminary passage is selected by monitoring the alarm of the data which flows on the currently used passage or the preliminary passage to connect the first ring and the second ring with each other.Type: GrantFiled: December 11, 1997Date of Patent: June 1, 1999Assignee: Fujitsu LimitedInventors: Shosaku Yamasaki, Atsuki Taniguchi, Kazuo Takatsu
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Patent number: 5867544Abstract: In a first phase-locked loop, a digital value corresponding to the mean frequency of an input clock signal is obtained. In a second phase-locked loop, the mean value of the phase difference of an output clock relative to the input clock is measured and is added to the digital value corresponding to the mean frequency, to obtain a control value. From this control value, a control signal for uniformly controlling a dual-modulus frequency divider is generated and supplied to the dual-modulus frequency divider. In a moving-average circuit, a selector selects input data when updating the contents of a serial latch circuit array, and selects an output of the serial latch circuit array when accumulating values. Values serially output from the latch circuit array for accumulation are successively added up using an adder and a latch circuit. In a division-ratio equalization circuit, a calculating circuit calculates quotients a.sub.0, a.sub.1, a.sub.2 . . . a.sub.m when the control value is expressed as 1/(a.sub.Type: GrantFiled: March 3, 1995Date of Patent: February 2, 1999Assignee: Fujitsu LimitedInventor: Atsuki Taniguchi
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Patent number: 5844889Abstract: There is provided a different system transfer method for a ring transmission system and a transmission apparatus for transferring the ring transmission system constructed in the UPSR system to the BLSR system while a line is in service. A control board of the UPSR system is replaced by a control board of the BLSR system. By changing over a path switch, a multiplexing/demultiplexing conversion board of the UPSR system on the non-operating side is replaced by a first multiplexing/demultiplexing conversion board of the BLSR system which is set so as to operate in the UPSR system. Also, by changing over the path switch again, a multiplexing/demultiplexing conversion board of the UPSR system on the non-operating side is replaced by a second multiplexing/demultiplexing conversion board of the BLSR system which is set so as to operate in the UPSR system.Type: GrantFiled: July 29, 1996Date of Patent: December 1, 1998Assignee: Fujitsu LimitedInventors: Kazuo Takatsu, Atsuki Taniguchi
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Patent number: 5534822Abstract: A phase-locked oscillator circuit with a broad pull-in frequency range generates a stable output signal synchronized to the phase of an input signal. An input-stage phase-locking circuit wherein the phase of a first frequency-converted output signal from a 1st frequency-conversion section is compared by a 1st phase-comparison circuit with the phase of the input signal and the phase of the 1st frequency-converted output signal is controlled. A processing section determines the frequency component of the input signal based on the phase-comparison output signal from the 1st phase-comparison circuit. An output-stage phase-locking circuit compares the phase of a 2nd frequency-conversion section with the phase of the input signal in a 2nd phase-comparison circuit. The phase of the 2nd frequency-conversion section is controlled based on the resulting phase-comparison output signal and the phase comparison output signal from the 1st phase-comparison circuit.Type: GrantFiled: January 31, 1994Date of Patent: July 9, 1996Assignee: Fujitsu LimitedInventors: Atsuki Taniguchi, Chiyoko Yamamoto
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Patent number: 5319637Abstract: A synchronous control method in a plurality of channel units for synchronously transmitting each transmission signal in response to a synchronous control signal by a plurality of channel units comprising the process steps of providing a synchronous control circuit for outputting a synchronous control signal to each channel unit; and supplying the synchronous control signal from the synchronous control circuit corresponding to a high order channel unit to the self-channel unit and the synchronous control circuit corresponding to a low order channel unit in response to the synchronous signal in the transmission signal. By using this method, a synchronous control circuit having a single circuit constitution can respond to many combinations of arbitrary channels.Type: GrantFiled: April 10, 1992Date of Patent: June 7, 1994Assignee: Fujitsu LimitedInventors: Atsuki Taniguchi, Satoshi Takeda, Norihisa Miura
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Patent number: 5099477Abstract: A phase matching circuit for realizing accurate data transmission and reception through phase shift control only during a data invalid region.Type: GrantFiled: July 19, 1990Date of Patent: March 24, 1992Assignee: Fujitsu LimitedInventors: Atsuki Taniguchi, Haruo Yamashita, Tomohiro Ishihara, Takaaki Wakisaka