公开(公告)号：US20230268998A1

公开(公告)日：2023-08-24

申请号：US18012461

申请日：2020-07-02

Applicant: Nippon Telegraph and Telephone Corporation

Inventor： Kohei SAITO ,  Takeshi SEKI ,  Sachio SUDA ,  Hiroki KAWAHARA ,  Kenta HIROSE ,  Hideki MAEDA

IPC: H04B10/40 ,  H04B10/073

CPC classification number: H04B10/40 ,  H04B10/073

Abstract: Provided is an optical transmission system that includes: a transponder having a transmitter and a receiver; a loopback path that directly couples a signal of the transmitter to the receiver; and a server that calculates, based on a signal transmitted using the loopback path, a compensation value to compensate for frequency characteristics of a signal transmitted from the transmitter.

公开(公告)号：US20220358526A1

公开(公告)日：2022-11-10

申请号：US17619976

申请日：2019-06-21

Applicant: Nippon Telegraph and Telephone Corporation

Inventor： Masahiro YOKOTA ,  Masatoshi NAMIKI ,  Hiroto TAKECHI ,  Katsuhiro ARAYA ,  Masaaki INAMI ,  Daisaku SHIMAZAKI ,  Hideki MAEDA

IPC: G06Q30/02

Abstract: A part information management device (10) includes: a part setting information acquirement unit (111) that acquires, as part setting information, information for identifying parts set in apparatuses; a market data acquirement unit (112) that acquires, for each of the parts, market data related to a part change of the part; a risk estimation unit (114) that estimates a risk of a silent change by a predetermined estimation algorithm with use of the market data, the risk of the silent change indicating that the part is changed; and a part information generation unit (113) that generates part information with the part setting information acquired for each of the parts and the estimated risk of the silent change corresponding to each other and stores the part information in a storage unit (13).

公开(公告)号：US20170257169A1

公开(公告)日：2017-09-07

申请号：US15528629

申请日：2015-11-27

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Kei KITAMURA ,  Takashi KOTANIGAWA ,  Takafumi HAMANO ,  Kaoru ARAI ,  Masahiro YOKOTA ,  Hideki MAEDA ,  Yoshiaki YAMADA ,  Takuya OHARA ,  Kengo SHINTAKU

IPC: H04B10/50 ,  H04J14/08

CPC classification number: H04B10/50 ,  H04B10/03 ,  H04J3/00 ,  H04J3/16 ,  H04J14/08

Abstract: There is provided a tray which is connected to a plurality of transmitters that multicarrier-transmit a plurality of parallel signals by optical subcarriers. The framer selects time slots to be allocated to a path to be accommodated such that the number of optical subcarriers corresponding to the time slots satisfies a predetermined condition on the basis of empty time slots which are specified by path accommodation information indicating a correspondence between paths allocated to a client signal and time slots in a signal frame and the optical subcarriers corresponding to the empty time slots indicated by time slot information indicating a correspondence between the time slots and the optical subcarriers, and sets the selected time slot in the path accommodation information. The framer sets a client signal to the time slots on the basis of the path accommodation information.

公开(公告)号：US20240330112A1

公开(公告)日：2024-10-03

申请号：US18740683

申请日：2024-06-12

Applicant: Nippon Telegraph and Telephone Corporation

Inventor： Katsuhiro ARAYA ,  Hiroto TAKECHI ,  Yasutaka SUGANO ,  Masahiro YOKOTA ,  Hideki MAEDA

IPC: G06F11/14 ,  H04L1/22

CPC classification number: G06F11/1443 ,  H04L1/22

Abstract: A transmission side transmission device includes: a first transmitter including a first switch; and a second transmitter including a second switch. A main signal is input to either the first transmitter or the second transmitter. The main signal input to the first transmitter is a first main signal and the main signal input to the second transmitter is a second main signal. The first transmitter and the second transmitter are configured such that, when the first transmitter detects a fault in the input first main signal: the second transmitter outputs the input second main signal to the first transmitter; and the first transmitter outputs the input second main signal via a first selector.

公开(公告)号：US20240235674A1

公开(公告)日：2024-07-11

申请号：US18558625

申请日：2021-05-10

Applicant: Nippon Telegraph and Telephone Corporation

Inventor： Ken ITO ,  Yasutaka SUGANO ,  Takeshi KAWASAKI ,  Hideki MAEDA

IPC: H04B10/079

CPC classification number: H04B10/07955 ,  H04B10/0799

Abstract: In the optical transmission system (1), a variable ATT (40) is used to attenuate both a data optical signal (L1) and an OSC optical signal (27) passing through a section according to an ATT value. A monitoring control server (50) includes an input unit (51) for receiving an input of information for specifying a monitoring section in the optical transmission system (1), an information collection unit (52) for collecting information for calculating an ATT value from a transmission device (20) and the variable ATT (40) existing in the monitoring section, and a change trial unit (54) for executing first determination processing for determining whether both of the optical signals can be transmitted, in accordance with whether or not power at the time of receiving the both optical signals passing through the monitoring section falls within a prescribed range, based on the information collected by the information collection unit (52).

公开(公告)号：US20220360520A1

公开(公告)日：2022-11-10

申请号：US17619982

申请日：2019-06-17

Applicant: Nippon Telegraph and Telephone Corporation

Inventor： Hiroshi YAMAMOTO ,  Toshiyuki OKA ,  Hideki MAEDA

IPC: H04L45/24 ,  H04L45/12 ,  H04L45/02

Abstract: To easily design a communication path topology optimized in view of reducing the amount of equipment needed under the condition that availability against multiple failures in a network is maintained. A transmission path design apparatus (100) performs: a step (S14) of extracting, from the multiple base stations, a first group of base stations whose number of communication-path routes connected is large, based on transmission network model initial data (D0); a step (S16) of extracting a first group of communication paths connecting the base stations in the first group; a step (S16) of calculating a both-end path value (d_i,j) for each communication path in the first group; and steps (S18 to S24) of determining the communication path whose both-end path value satisfies a predetermined condition as a thinning-out target communication path, and generating output data Dy in which the thinning-out target communication path is reflected on the transmission network model initial data. The optimized output data (Dy) can be generated by extracting a deletable communication path in order from the model of the initial data (D0).

公开(公告)号：US20170324472A1

公开(公告)日：2017-11-09

申请号：US15526835

申请日：2015-11-27

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Kei KITAMURA ,  Takafumi HAMANO ,  Takashi KOTANIGAWA ,  Kaoru ARAI ,  Masahiro YOKOTA ,  Hideki MAEDA ,  Yoshiaki YAMADA ,  Takuya OHARA ,  Kengo SHINTAKU

IPC: H04B10/032 ,  H04J3/16

CPC classification number: H04B10/032 ,  H04B1/74 ,  H04B10/03 ,  H04J3/00 ,  H04J3/14 ,  H04J3/16

Abstract: A framer in a transmission device allocates plural optical channel time slots to a plurality of logical prioritized paths. It allocates received client signals to the allocated time slots, and transmits the client signals by a plurality of optical subcarriers that use a plurality of optical wavelengths corresponding to the plurality of time slots. The framer includes: a time slot allocation unit that, in a case where an optical wavelength corresponding to a time slot allocated to a logical path having a high transmission priority is not used, allocates at least one of the plurality of time slots to the logical path having the high transmission priority while the time slot corresponding to the unused optical wavelength is avoided, to change the time slot allocated to the logical path having the high transmission priority.

公开(公告)号：US20220353206A1

公开(公告)日：2022-11-03

申请号：US17619808

申请日：2019-06-20

Applicant: Nippon Telegraph and Telephone Corporation

Inventor： Hiroto TAKECHI ,  Hideki MAEDA ,  Daisaku SHIMAZAKI ,  Masaaki INAMI ,  Katsuhiro ARAYA ,  Masatoshi NAMIKI ,  Masahiro YOKOTA

IPC: H04L49/9057 ,  H04L49/90 ,  H04L49/253

Abstract: A transmission device (10) includes a flow table (11) that stores identification information about an uninterruptible target flow; a transmission-side identification unit (12) that identifies whether a received packet is from the target flow or a non-target flow based on whether the received packet matches the identification information about the target flow stored in the flow table (11); a tag application unit (13) that applies, to packets from the target flow, an uninterruptible identifier indicating that the packets are from the target flow and a sequence number for distinguishing the packets from other packets; and a branch unit (14) that branches the packets from the target flow processed by the tag application unit (13) into packets to be transferred to an active path (41) among redundant routes and packets to be transferred to a backup path (42) among the redundant routes.

公开(公告)号：US20170366288A1

公开(公告)日：2017-12-21

申请号：US15527274

申请日：2015-11-26

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Masahiro YOKOTA ,  Takafumi HAMANO ,  Takashi KOTANIGAWA ,  Kaoru ARAI ,  Kei KITAMURA ,  Hideki MAEDA ,  Yoshiaki YAMADA ,  Takuya OHARA ,  Kengo SHINTAKU

IPC: H04J3/16 ,  H04J14/08 ,  H04L12/801 ,  H04L12/939

CPC classification number: H04J3/1652 ,  H04B10/03 ,  H04J3/14 ,  H04J14/00 ,  H04J14/02 ,  H04J14/08 ,  H04L47/34 ,  H04L49/552

Abstract: A framer in a transmission device that allocates time slots of an optical channel to a logical path, divides client signals received via the logical path to the time slots allocated to the logical path, and transmits the client signals by a plurality of optical suhcarriers using optical wavelengths correlated with the time slots includes: a time slot allocating unit configured to perform a process of reducing a transmission band of the logical path when some of the optical wavelengths are unavailable and changing the time slots allocated to the logical path depending on the reduced transmission band to avoid using the time slots corresponding to the unavailable optical wavelengths.

公开(公告)号：US20170324496A1

公开(公告)日：2017-11-09

申请号：US15526927

申请日：2015-11-26

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Yoshiaki YAMADA ,  Kengo SHINTAKU ,  Takuya OHARA ,  Kei KITAMURA ,  Takashi KOTANIGAWA ,  Takafumi HAMANO ,  Kaoru ARAI ,  Masahiro YOKOTA ,  Hideki MAEDA

IPC: H04J3/06 ,  H04J14/02 ,  H04J3/16 ,  H04J14/08

CPC classification number: H04J3/0652 ,  H04J3/0623 ,  H04J3/07 ,  H04J3/1652 ,  H04J14/00 ,  H04J14/02 ,  H04J14/08 ,  H04J2203/006

Abstract: In the optical transport system a transport frame generator divides a transport frame accommodating plural client signals into plural transmission signals. Subcarrier transmission units convert the signals into optical signals using different optical carriers and transmit the converted optical signals. Subcarrier reception units receive the transmitted optical signals and convert the optical signals into reception signals. A transport frame termination unit combines the reception signals to restore the transport frame. A time-demultiplexing processor time-demultiplexes the restored transport frame to be separated into the client signals. A time slot control unit determines a new time slot allocation when time-multiplexing the client signals in the transport frame and stops supply of electric power to a subcarrier transmission unit and a subcarrier reception unit that transmit and receive an optical signal to which the client signals are not allocated.