Patents by Inventor Ayumu Nonaka
Ayumu Nonaka 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: 9450693Abstract: A transmission apparatus includes a clock generator that generates a clock. When data is received, the transmission apparatus maps a plurality of pieces of received asynchronous data to a cross connection frame by using the generated clock. The transmission apparatus also cross-connects the mapped cross connection frame by using the generated clock. The transmission apparatus also transmits data of the cross-connected cross connection frame.Type: GrantFiled: March 20, 2012Date of Patent: September 20, 2016Assignee: FUJITSU LIMITEDInventors: Ayumu Nonaka, Mamoru Suematsu
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Patent number: 9287970Abstract: An optical transmission device includes: a switching configured to be capable of switching a transmission path to which light is input from a first transmission path to a second transmission path; a first calculation unit configured to calculate, based on a difference between a first light level of the first transmission path and a second light level of the second transmission path, a first control amount for the second light level; and a control unit configured to perform a first control in which the second light level is decreased or increased based on the first control amount upon switching of the transmission path.Type: GrantFiled: February 28, 2013Date of Patent: March 15, 2016Assignee: FUJITSU LIMITEDInventor: Ayumu Nonaka
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Patent number: 9231695Abstract: An optical transmission device includes: a switching configured to be capable of switching a transmission path to which light is input from a first transmission path to a second transmission path; a first calculation unit configured to calculate, based on a difference between a first light level of the first transmission path and a second light level of the second transmission path, a first control amount for the second light level; and a control unit configured to perform a first control in which the second light level is decreased or increased based on the first control amount upon switching of the transmission path.Type: GrantFiled: February 28, 2013Date of Patent: January 5, 2016Assignee: FUJITSU LIMITEDInventor: Ayumu Nonaka
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Patent number: 8848738Abstract: There is provided an optical transmission device which includes a determiner, a convertor, and a switch. The determiner determines whether a frame includes a fixed stuff byte area or not when the frame is received from a first network, where the frame includes a payload area for storing client data and the fixed stuff byte area is for storing fixed data. When the determiner determines that the frame includes the fixed stuff byte area, a convertor to convert a fixed stuff byte area into the payload area and a switch switches a clock frequency from a first clock frequency used in the first network to a second clock frequency used in a second network when the frame including the converted fixed stuff byte area is output to the second network on the basis of the clock frequency as a reference.Type: GrantFiled: December 20, 2010Date of Patent: September 30, 2014Assignee: Fujitsu LimitedInventors: Ayumu Nonaka, Yuji Shimada, Syed Faruk Ahmed
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Publication number: 20130294762Abstract: An optical transmission device includes: a switching configured to be capable of switching a transmission path to which light is input from a first transmission path to a second transmission path; a first calculation unit configured to calculate, based on a difference between a first light level of the first transmission path and a second light level of the second transmission path, a first control amount for the second light level; and a control unit configured to perform a first control in which the second light level is decreased or increased based on the first control amount upon switching of the transmission path.Type: ApplicationFiled: February 28, 2013Publication date: November 7, 2013Applicant: Fujitsu LimitedInventor: Ayumu Nonaka
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Publication number: 20120300771Abstract: A transmission apparatus includes a clock generator that generates a clock. When data is received, the transmission apparatus maps a plurality of pieces of received asynchronous data to a cross connection frame by using the generated clock. The transmission apparatus also cross-connects the mapped cross connection frame by using the generated clock. The transmission apparatus also transmits data of the cross-connected cross connection frame.Type: ApplicationFiled: March 20, 2012Publication date: November 29, 2012Applicant: FUJITSU LIMITEDInventors: Ayumu NONAKA, Mamoru Suematsu
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Patent number: 8160111Abstract: A system and method of transmitting client data encoded according to an 8B/10B encoding between a client side and an optical communication network side, including inserting padding signals in an amount corresponding to a rate difference between a clock on the client side and a clock in the optical transmission device and controlling a clock to be used as a reference in transmitting the client data to synchronize with a clock having been used as a reference in transmitting the client data on the basis of a ratio of padding signals having been inserted in the client data.Type: GrantFiled: October 17, 2008Date of Patent: April 17, 2012Assignee: Fujitsu LimitedInventors: Ayumu Nonaka, Yuji Shimada, Hideo Kuroda, Koji Nekoda
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Publication number: 20110150469Abstract: There is provided an optical transmission device which includes a determiner, a convertor, and a switch. The determiner determines whether a frame includes a fixed stuff byte area or not when the frame is received from a first network, where the frame includes a payload area for storing client data and the fixed stuff byte area is for storing fixed data. When the determiner determines that the frame includes the fixed stuff byte area, a convertor to convert a fixed stuff byte area into the payload area and a switch switches a clock frequency from a first clock frequency used in the first network to a second clock frequency used in a second network when the frame including the converted fixed stuff byte area is output to the second network on the basis of the clock frequency as a reference.Type: ApplicationFiled: December 20, 2010Publication date: June 23, 2011Applicant: FUJITSU LIMITEDInventors: Ayumu NONAKA, Yuji Shimada, Syed Faruk Ahmed
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Patent number: 7706693Abstract: This provides an optically transmitting apparatus, an optically transmitting system and an optically transmitting method. This receives an optical signal which is configured in accordance with any one frame format among a plurality of frame formats and includes at least a clock signal and a data signal, and performs an optical-electric/electric-optical conversion on the received optical signal, and extracts the clock signal and the data signal, which correspond to the frame format, from the optical-electric converted signal. This correlates and stores an idle code indicative of a block where the actual data is not communicated and the frame format, reads the idle code from the extracted data signal, identifies the frame format corresponding to the read idle code, and executes a transmitting process in accordance with the identified frame format.Type: GrantFiled: July 25, 2006Date of Patent: April 27, 2010Assignee: Fujitsu LimitedInventors: Ayumu Nonaka, Kouji Nekoda, Atsunori Machida
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Publication number: 20090169218Abstract: A system and method of transmitting client data encoded according to an 8B/10B encoding between a client side and an optical communication network side, including inserting padding signals in an amount corresponding to a rate difference between a clock on the client side and a clock in the optical transmission device and controlling a clock to be used as a reference in transmitting the client data to synchronize with a clock having been used as a reference in transmitting the client data on the basis of a ratio of padding signals having been inserted in the client data.Type: ApplicationFiled: October 17, 2008Publication date: July 2, 2009Applicant: FUJITSU LIMITEDInventors: Ayumu Nonaka, Yuji Shimada, Hideo Kuroda, Koji Nekoda
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Publication number: 20070217792Abstract: This provides an optically transmitting apparatus, an optically transmitting system and an optically transmitting method. This receives an optical signal which is configured in accordance with any one frame format among a plurality of frame formats and includes at least a clock signal and a data signal, and performs an optical-electric/electric-optical conversion on the received optical signal, and extracts the clock signal and the data signal, which correspond to the frame format, from the optical-electric converted signal. This correlates and stores an idle code indicative of a block where the actual data is not communicated and the frame format, reads the idle code from the extracted data signal, identifies the frame format corresponding to the read idle code, and executes a transmitting process in accordance with the identified frame format.Type: ApplicationFiled: July 25, 2006Publication date: September 20, 2007Inventors: Ayumu Nonaka, Kouji Nekoda, Atsunori Machida