公开(公告)号：US20240056179A1

公开(公告)日：2024-02-15

申请号：US17766451

申请日：2019-10-30

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Kei KITAMURA ,  Fumikazu INUZUKA ,  Kengo SHINTAKU ,  Takafumi TANAKA ,  Takuya ODA

IPC: H04B10/032 ,  H04Q11/00

CPC classification number: H04B10/032 ,  H04Q11/0062 ,  H04Q2213/08 ,  H04Q2011/0081

Abstract: A transmission apparatus includes a first communication unit, a second communication unit, a detection unit, a control unit, and a selection unit. The first communication unit uses a first path for communication, when electric power is supplied. The second communication unit uses a second path for communication, when electric power is supplied. The detection unit detects a fault predictive sign. The control unit supplies no electric power to the second communication unit when the detection unit does not detect the fault predictive sign. The control unit starts supplying electric power to the second communication unit and performs normality confirmation of the second path when the detection unit detects the fault predictive sign, before switching from the first path to the second path. The selection unit selects and outputs, when the first communication unit and the second communication unit have received signals, either the signal received by the first communication unit or the signal received by the second communication unit.

公开(公告)号：US20240028552A1

公开(公告)日：2024-01-25

申请号：US18025129

申请日：2020-09-14

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Takuya OHARA ,  Takuya ODA ,  Fumikazu INUZUKA ,  Takafumi TANAKA ,  Masayuki SHIMODA

IPC: G06F15/17 ,  H04B1/38

CPC classification number: G06F15/17 ,  H04B1/38

Abstract: One aspect of the present invention is an information processing system including a computer installed in a computer base, a first transceiver connected to the computer, a second transceiver installed in a user base used by a user, a device connected to the second transceiver, a network configured to perform communication between a plurality of the first transceivers and the second transceiver, and a controller configured to control connection between one of the plurality of the first transceivers and the second transceiver, in which the controller is configured to control connection between one of the plurality of the first transceivers and the second transceiver via the network having a circuit switching function.

公开(公告)号：US20230336629A1

公开(公告)日：2023-10-19

申请号：US18025524

申请日：2020-09-14

Applicant: Nippon Telegraph and Telephone Corporation

Inventor： Takuya OHARA ,  Takuya ODA ,  Fumikazu INUZUKA ,  Takafumi TANAKA ,  Masayuki SHIMODA

IPC: H04L67/141 ,  H04L41/084

CPC classification number: H04L67/141 ,  H04L41/0846

Abstract: One aspect of the present invention is an information processing system that includes a computing machine installed in a computing machine base, and a first transmitting/receiving apparatus connected to the computing machine, a second transmitting/receiving apparatus installed in a user base that is used by a user, and a device connected to the second transmitting/receiving apparatus, and a control apparatus configured to control connection between the first transmitting/receiving apparatus and the second transmitting/receiving apparatus. In the information processing system, the control apparatus is configured to change the connection between the first transmitting/receiving apparatus and the second transmitting/receiving apparatus, and copy the state of the pre-change computing machine from the pre-change computing machine into the post-change computing machine.

公开(公告)号：US20180359024A1

公开(公告)日：2018-12-13

申请号：US15778910

申请日：2016-11-22

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Takuya ODA ,  Tetsuro INUI ,  Akira HIRANO ,  Wataru IMAJUKU ,  Shoukei KOBAYASHI ,  Takafumi TANAKA ,  Yutaka MIYAMOTO ,  Hidehiko TAKARA

IPC: H04B10/077 ,  H04B10/2581 ,  H04J14/02

CPC classification number: H04B10/0771 ,  H04B10/077 ,  H04B10/2581 ,  H04J14/00 ,  H04J14/02 ,  H04L12/437

Abstract: A communication system which includes: three or more nodes; a multi-core fiber having a plurality of cores, the multi-core fiber being used in at least a partial segment of a connection between the nodes; a detection signal output unit configured to output a fault detection signal transmitted by the core provided in the multi-core fiber configured to connect together the nodes; and a fault detection unit configured to determine whether a fault has occurred between the nodes on the basis of a detection result of the fault detection signal.

公开(公告)号：US20250016089A1

公开(公告)日：2025-01-09

申请号：US18034288

申请日：2020-11-16

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Takafumi TANAKA ,  Takuya OHARA ,  Fumikazu INUZUKA ,  Takuya ODA ,  Masayuki SHIMODA

IPC: H04L45/24

Abstract: An aspect of the present invention is a communication path search device that constructs a multicast path of a plurality of nodes connected to a network, the communication path search device including a network device information management unit configured to manage a device specification including constraint information on the number of branches of each of the nodes on the network, a network topology management unit configured to manage link information between the nodes on the network, and a multicast tree calculation unit configured to construct a Steiner tree of a path connecting a start node and an end node based on a new request, an existing request, the constraint information on the number of branches of each of the nodes, constraint information on a maximum number of branches of each of the nodes, and the link information, the new request and the existing request each including start node and end node information.

公开(公告)号：US20230412299A1

公开(公告)日：2023-12-21

申请号：US18029726

申请日：2020-10-22

Applicant: Nippon Telegraph and Telephone Corporation

Inventor： Takafumi Tanaka ,  Takuya OHARA ,  Fumikazu INUZUKA ,  Takuya ODA ,  Masayuki SHIMODA

IPC: H04J14/02 ,  H04B10/27

CPC classification number: H04J14/0267 ,  H04B10/27

Abstract: An optical path design device includes a scheduling unit configured to generate, according to demand information, including information on a frequency bandwidth required for communication between a first node device at a start point of an optical path and a second node device at an end point of an optical path, and including information on a future time zone in which the communication will be executed, allocation content including information on a route connecting the first node device and the second node device and information on a center frequency of the frequency allocated to the communication corresponding to the demand information and determine the start time and the end time of the allocation of the allocation content, and a queue for adjusting a timing of allocation of the allocation content in the future time zone based on the start time and the end time of the allocation in a case where the allocation content cannot be allocated to the communication corresponding to the demand information with the current time as the start time of the allocation.

公开(公告)号：US20230403220A1

公开(公告)日：2023-12-14

申请号：US18027597

申请日：2020-09-29

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Takuya ODA ,  Takuya OHARA ,  Fumikazu INUZUKA ,  Takafumi TANAKA ,  Masayuki SHIMODA

IPC: H04L43/0852

CPC classification number: H04L43/0852

Abstract: One aspect of the present invention provides an information processing system in which at least one of a connection between an input/output device and a computing machine or a connection between the computing machine and a central computing machine is made via a network, and a plurality of users uses the same content by using the input/output device via the network, the information processing system including a delay measurement device configured to measure an amount of transmission delay generated between the input/output device and the central computing machine for each of the users, and a delay adjustment device configured to adjust a difference in the amount of transmission delay between the users to be kept within a predetermined value on the basis of the measured amount of transmission delay.

公开(公告)号：US20210028857A1

公开(公告)日：2021-01-28

申请号：US16979662

申请日：2019-03-01

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Fumikazu INUZUKA ,  Shokei KOBAYASHI ,  Akira HIRANO ,  Wataru KAWAKAMI ,  Tetsuro INUI ,  Seiki KUWABARA ,  Kei KITAMURA ,  Takafumi TANAKA ,  Takuya ODA ,  Hideki NISHIZAWA ,  Seiji OKAMOTO

IPC: H04B10/079 ,  H04B10/077 ,  H04B10/272 ,  H04B10/25 ,  H04B10/516

Abstract: There is provided an optical transmission system in which a plurality of optical transmission and reception apparatuses perform 1-to-N transmission and reception of optical signals (N is an integer equal to or greater than 1), the optical transmission system being configured to select a communication condition that includes at least a modulation scheme or a baud rate and is a communication condition when each of the optical transmission and reception apparatuses performs transmission and reception in accordance with a transmission line condition that is between any one first optical transmission and reception apparatus and each of second optical transmission and reception apparatuses, which are N grounds, other than the first optical transmission and reception apparatus.

公开(公告)号：US20180358773A1

公开(公告)日：2018-12-13

申请号：US15778541

申请日：2016-11-22

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Takuya ODA ,  Tetsuro INUI ,  Akira HIRANO ,  Wataru IMAJUKU ,  Shoukei KOBAYASHI ,  Takafumi TANAKA ,  Yutaka MIYAMOTO ,  Hidehiko TAKARA

IPC: H01S3/067 ,  H01S3/30 ,  H01S3/16 ,  H04B10/2581

CPC classification number: H01S3/06737 ,  G02F1/35 ,  H01S3/067 ,  H01S3/10 ,  H01S3/1608 ,  H01S3/30 ,  H01S3/302 ,  H04B10/2581 ,  H04B10/291

Abstract: An optical amplification system includes: three or more nodes; a multi-core fiber having a plurality of cores, the multi-core fiber being used in at least a partial segment of the connection between the nodes; an amplification light input unit configured to input amplification light to a core of the plurality of cores of the multi-core fiber; an amplification unit configured to amplify communication light transmitted through at least one core of the plurality of cores of the multi-core fiber using the amplification light, the amplification unit being provided in the nodes or between the nodes; and an amplification light coupling unit configured to couple the amplification light input by the amplification light input unit to the amplification unit.

公开(公告)号：US20180351639A1

公开(公告)日：2018-12-06

申请号：US15778011

申请日：2016-11-22

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Takuya ODA ,  Tetsuro INUI ,  Akira HIRANO ,  Wataru IMAJUKU ,  Shoukei KOBAYASHI ,  Takafumi TANAKA ,  Yutaka MIYAMOTO ,  Hidehiko TAKARA

IPC: H04B10/077 ,  H04B10/25

Abstract: A communication system includes three or more nodes, and a multi-core fiber having a plurality of cores, the multi-core fiber being used in at least a partial segment of a connection between the nodes, wherein each of nodes includes: a fault information transmitting device configured to transmit fault information indicating that a fault has occurred in a communication path between one node and another node of the nodes when it is detected that it is not possible to perform communication between the one node and the another node; and a fault location specifying device configured to specify a section between nodes in which a fault has occurred on the basis of the fault information received from the fault information transmitting device provided in each of the nodes