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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
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.
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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
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.
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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.
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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
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.
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