Time Patents (Class 398/52)
  • Patent number: 11695702
    Abstract: A packet transfer device 100 includes a packet classification unit 120 configured to classify received packets, queues 140 for respective classifications, priorities being set to the queues, a dequeue processing unit 150 configured to extract packets from the queue under a predetermined rule based on the priorities set to the queues, and a queue priority control unit 130 configured to perform control, upon detecting that a reception amount of packets related to a communication flow temporarily or intermittently increases from a reception amount under a normal condition, such that a priority of one of the queues holding the packets related to the communication flow is temporarily raised from a priority under the normal condition, during a period while the reception amount of packets related to the communication flow temporarily or intermittently increases.
    Type: Grant
    Filed: October 16, 2019
    Date of Patent: July 4, 2023
    Assignee: Nippon Telegraph and Telephone Corporation
    Inventors: Hiroki Iwasawa, Kenta Kawakami, Takeshi Kuwahara
  • Patent number: 11569923
    Abstract: Provided are a method and apparatus for sending and receiving a multiframe, a communication device, and a communication network system. The method includes: determining a multiframe identifier used for identifying a multiframe number according to a number of timeslots of a physical layer, where the multiframe number is the number of frames constituting one multiframe; and sending the multiframe to a receiving end, where the multiframe carries the multiframe identifier. Further provided is a computer storage medium.
    Type: Grant
    Filed: December 8, 2017
    Date of Patent: January 31, 2023
    Assignee: ZTE CORPORATION
    Inventor: Feng Liu
  • Patent number: 10841217
    Abstract: Aspects of this disclosure relate to detecting a header of a packet. A receive signal path can provide a receive signal that includes packets and a guard preamble between successive packets of the packets. A receiver control circuit can trigger a timer that sets a time for detecting a header of a packet in response to detecting an end of a preamble of the packet.
    Type: Grant
    Filed: May 25, 2018
    Date of Patent: November 17, 2020
    Assignee: Analog Devices Global Unlimited Company
    Inventors: Michael W. O'Brien, Sudarshan Onkar, Joshua J. Nekl
  • Patent number: 10608766
    Abstract: A multi-service transport and receiving method and apparatus are provided. The method includes: obtaining mapping transport control information of M services; determining a mapping procedure of the M services; and mapping the M services to a variable optical payload unit according to the mapping procedure. Therefore, a transport solution can be flexibly customized based on a transport requirement of a client service, so that a data plane becomes programmable.
    Type: Grant
    Filed: July 26, 2018
    Date of Patent: March 31, 2020
    Assignee: Huawei Technologies Co., Ltd.
    Inventors: Wei Su, Maarten Petrus Joseph Vissers
  • Patent number: 10411821
    Abstract: A technique is provided for transmitting client data included in a client signal via an optical transmission path of an optical transport network. The optical transport network uses transport frames include a transport frame period for transmitting client data. The method includes receiving multiple client entities comprising multiple client data bits; determining the number of client data entities received during a transport frame period to establish a mean number of client data entities to be included in a transport frame, the mean number of client data entities corresponding to a mean number of client data bits; mapping multiple client data entities into the transport frame wherein mapping comprises alternately adding and subtracting an amount of client data bits to/from the mean number of client data bits for at least two consecutive transport frames; and transmitting the transport frames comprising the client data via the optical transport network.
    Type: Grant
    Filed: February 17, 2016
    Date of Patent: September 10, 2019
    Assignee: Alcatel Lucent
    Inventors: Gerhard Meyer, Jurgen Rahn
  • Patent number: 10033623
    Abstract: A method for connecting endpoints. The method may include determining, using a first group of software threads, cross-connection information regarding various cross-connections among various network elements. The network elements may include a first network element and a second network element. The method may further include determining, using the first group of software threads, link information regarding various links between the network elements. The method may further include processing, within a network cache, the cross-connection information and the link information into various network resources groups. Each network resource group of the network resources groups may describe adjacent cross-connections for a link among the links.
    Type: Grant
    Filed: April 27, 2016
    Date of Patent: July 24, 2018
    Assignee: Ciena Corporation
    Inventors: Ankur Jain, Deepinder Gill, Nigel Robert Davis, Amal Karboubi
  • Patent number: 9915971
    Abstract: There is provided a transmission apparatus including: a shift register configured to generate a plurality of timing pulses indicating different timings, from a frame pulse synchronized with a frame signal; and a plurality of signal processors configured to sequentially process the frame signal based on timings indicated by one or more timing pulses among the plurality of timing pulses.
    Type: Grant
    Filed: September 22, 2016
    Date of Patent: March 13, 2018
    Assignee: FUJITSU LIMITED
    Inventor: Ichiro Yokokura
  • Patent number: 9532119
    Abstract: The present invention discloses an apparatus and a method for transporting an ODU service. The transport apparatus includes a first ODU service processing unit, a timeslot allocation unit, a switching output port allocation unit, an Ethernet switching unit, and a second ODU service processing unit, where a table of a mapping between output ports of the first ODU service processing unit and timeslots is determined according to a rate of an ODUflex frame carried in an obtained ODU service and the number of the output ports of the first ODU service processing unit, and the ODU service is forwarded, which resolves a problem in the prior art that an ODUflex frame cannot be transported by using the Ethernet switching unit, thereby ensuring that service congestion does not occur on a forwarding port of a sending apparatus, and improving transmission quality of a communications network.
    Type: Grant
    Filed: September 15, 2015
    Date of Patent: December 27, 2016
    Assignee: Huawei Technologies Co., Ltd.
    Inventors: Zhiyun Chen, Huiyu Zhou, Xing Hu
  • Patent number: 9172488
    Abstract: An optical signal terminating apparatus for an optical path network includes: a variable filter selecting an optical signal of a predetermined wavelength path making up any one of a plurality of wavebands included in one wavelength division multiplexing light selected from a plurality of wavelength division multiplexing lights respectively transmitted in parallel via a plurality of optical fibers to a relay node in the optical path network, the variable filter dropping the optical signal to an electric layer, the variable filter including a waveband separator separating the wavelength division multiplexing light into a plurality of wavebands, a waveband selector selecting one waveband from a plurality of wavebands separated by the waveband separator, a wavelength separator separating one waveband selected by the waveband selector into wavelengths, and a drop wavelength selector.
    Type: Grant
    Filed: September 12, 2011
    Date of Patent: October 27, 2015
    Assignee: NATIONAL UNIVERSITY CORPORATION NAGOYA UNIVERSITY
    Inventors: Ken-ichi Sato, Hiroshi Hasegawa, Ryosuke Hirako
  • Patent number: 9148341
    Abstract: Devices and methods for partially upgrading a programmable pluggable transceiver that is in service using the regular datapaths without degrading the basic transparent, hitless pass-through functionality of the transceiver. The programmable logic gate array can be divided into four generalized parts: core logic for basic transceiver pass-through functionality over the datapaths, upgradeable internal logic, connectivity logic for selectively outputting on the datapaths from the core and internal logics, and control logic for isolating, upgrading and reconnecting the internal logic without affecting the basic transparent hitless pass-through functionality of the transceiver.
    Type: Grant
    Filed: March 26, 2013
    Date of Patent: September 29, 2015
    Assignee: JDS UNIPHASE CORPORATION
    Inventors: Emmanuelle Marie Jos├Ęphe Janz, Luc Chouinard, David George Coomber
  • Publication number: 20150139644
    Abstract: An optical drop device includes: a clock extractor configured to extract a clock signal from a multi-channel optical signal that includes a plurality of optical signals having different optical frequencies; a pulse generator configured to generate a pulse signal that is synchronized with the clock signal; an optical inverse Fourier transform unit configured to transform the multi-channel optical signal into a time division multiplexing optical signal by using an inverse Fourier transform; and an optical switch configured to drop an optical signal that exists in a time slot to which the pulse signal is applied, from the time division multiplexing optical signal.
    Type: Application
    Filed: November 11, 2014
    Publication date: May 21, 2015
    Applicant: FUJITSU LIMITED
    Inventors: Tomoyuki Kato, Shigeki Watanabe
  • Patent number: 9020345
    Abstract: A method for establishing an end-to-end service is provided in the present invention, which includes: acquiring link information in a network and multi-stage multiplexing capability constraint information supported by gateway network elements; when an end-to-end path computation request is received, according to the link information and the multi-stage multiplexing capability constraint information, performing an end-to-end routing computation to acquire an end-to-end routing, and selecting a multi-stage multiplexing capability used on a gateway network element passed by the end-to-end routing; and configuring the end-to-end service, and configuring the selected multi-stage multiplexing capability on the gateway network element passed by the end-to-end routing. A system for establishing the end-to-end service, an optical transport network and a signal transmission method thereof are also provided in the present invention, which can all implement the interconnection between new networks and old networks.
    Type: Grant
    Filed: September 17, 2010
    Date of Patent: April 28, 2015
    Assignee: ZTE Corporation
    Inventors: Xihua Fu, Xinling Zhang
  • Patent number: 9020344
    Abstract: A unified network and elements thereof, including a switch fabric, is provided. The switch fabric may include a plurality of transport elements and a first signal-communication media. The transport elements may be adapted to communicatively couple and to communicate, via the first signal-communication media, transport signals adapted for communication among any of the plurality of transport elements. At least one transport element may be further adapted to communicate, via a second signal-communication media, signals and/or sets of signal originating from and/or terminating to one or more network nodes. Each of the electrical signals may be formatted in accordance with a protocol for electrical signals. And one or more of the transport signals may include the electrical signals in adapted form. Additionally and/or alternatively, one or more of the transport signals may be formed from, or as a function of, the electrical signals.
    Type: Grant
    Filed: March 24, 2011
    Date of Patent: April 28, 2015
    Assignee: Zephyr Photonics
    Inventor: Jason Blain Stark
  • Patent number: 9014563
    Abstract: An apparatus is provided that includes n communication channels, and m communication media interfaces, and v virtual lanes. V is a positive integer multiple of the least common multiple of m and n. An information stream is transferred into data and alignment blocks striped across all of the v virtual lanes, the blocks being communicated from the virtual lanes onto the communication channels. The blocks are received on the communication channels. Each of the communication channels transmits a different portion of the blocks striped across all of the v virtual lanes. In more particular embodiments, v>=n>=m. The communication media interfaces can be electrical and optical. Each of the communication channels can include a SerDes interface operating at least 5 Gigabits per second. Furthermore, each of the m communication media interfaces is configured to transmit a different stream of information over a single optical fiber.
    Type: Grant
    Filed: December 11, 2007
    Date of Patent: April 21, 2015
    Assignee: Cisco Technology, Inc.
    Inventors: Mark A. Gustlin, Oded Trainin, Luca Della Chiesa
  • Patent number: 9002212
    Abstract: Provided is an optical line terminator (OLT) to recover packet data and a clock from an optical signal including a silent interval. The OLT may receive packet data and a clock from at least one optical network unit (ONU). Even in a silent interval in which the at least one ONU does not transmit packet data, the OLT may successfully recover the clock.
    Type: Grant
    Filed: August 19, 2011
    Date of Patent: April 7, 2015
    Assignee: Intellectual Discovery Co., Ltd.
    Inventors: Mun Seob Lee, Dong Soo Lee, Geun Yong Kim, Hark Yoo, Young Suk Lee, Sung Chang Kim, Jai Sang Koh, Jong Deog Kim
  • Patent number: 9002202
    Abstract: The present invention relates to a method and apparatus for reducing the resource utilization of the switching fabric in a SONET/SDH multiplexer by switching data on a TU level instead of byte or column level.
    Type: Grant
    Filed: March 29, 2013
    Date of Patent: April 7, 2015
    Assignee: Tejas Networks Limited
    Inventors: Prashant Prabhakar Dabholkar, Devendra Kumar Chaudhary
  • Publication number: 20150071637
    Abstract: Embodiments of the present invention provide a data processing method, related device, and system for an optical transport network. The data processing method for the optical transport network includes: encapsulating service data into an optical payload unit; mapping the optical payload unit to an optical channel data unit; mapping the optical channel data unit to a payload area of an optical burst transport unit; performing electrical-optical conversion on the optical burst transport unit to form an optical burst transport unit; carrying the optical burst transport unit onto an optical timeslot of an optical burst channel; and transmitting the optical burst channel to a line. Technical solutions provided by the present invention can effectively simplify a data processing process and reduce a data processing delay.
    Type: Application
    Filed: November 14, 2014
    Publication date: March 12, 2015
    Applicant: HUAWEI TECHNOLOGIES CO., LTD.
    Inventors: Ning DENG, Maarten P.J. Vissers, Xiaozhong Shi
  • Publication number: 20150071636
    Abstract: Methods and systems for variable rate control include determining a new communications rate in response to measured data traffic patterns. A receive change message is transmitted to a receiver that triggers the receiver to wait for an end of transmission (EoT) message and to set a new communications rate. A transmit change message is transmitted to a transmitter that triggers the transmitter to send the EoT message to the receiver, to set the new communications rate, and to send a start of transmission (SoT) message to the receiver before resuming data communications.
    Type: Application
    Filed: September 8, 2014
    Publication date: March 12, 2015
    Inventors: Junqiang Hu, Konstantinos Kanonakis, Ting Wang, Philip Ji
  • Patent number: 8977131
    Abstract: An optical apparatus receives an upward signal light from a plurality of subscriber units, where the upward signal light is composed of a plurality of time slots corresponding to the plurality of optical subscriber units. The optical apparatus includes a driving unit configured to determine a respective required gain for light from each of the plurality of optical subscriber units, an amplifying section configured to amplify the upward signal light with the required gain corresponding to the time slots of the upward signal light, and a receiver configured to receive the amplified upward signal light.
    Type: Grant
    Filed: February 17, 2009
    Date of Patent: March 10, 2015
    Assignee: Fujitsu Limited
    Inventors: Setsuo Yoshida, Susumu Kinoshita
  • Patent number: 8977120
    Abstract: In an apparatus for accommodating and multiplexing asynchronous client signals in which an idle signal is defined, the transmission side transmits client signals after synchronizing the client signals by inserting or removing, with reference to a specific client signal, an idle signal to/from the same type of another client signal, and in the receiving side, a PLL part is shared by recovering a clock from a client signal and distributing the clock for another client signal.
    Type: Grant
    Filed: March 11, 2011
    Date of Patent: March 10, 2015
    Assignees: Nippon Telegraph and Telephone Corporation, Fujitsu Limited
    Inventors: Takuya Ohara, Takashi Ono, Shigeki Aisawa, Masahito Tomizawa, Hiroyuki Honma, Satoru Saitoh, Masahiro Shioda
  • Patent number: 8958695
    Abstract: An optical adding and dropping device includes a drop section including an input port and having a through port and a plurality of drop ports set as output ports, a first multiplexer adapted to multiplex light from the through port and light from a plurality of add ports, and a spectrum foot removing section provided on the input side of the first multiplexer and adapted to remove a foot of a spectrum of light to be inputted from the add ports to the first multiplexer. The optical adding and dropping device can be configured at a low cost while it has adding and dropping functions.
    Type: Grant
    Filed: December 18, 2008
    Date of Patent: February 17, 2015
    Assignee: Fujitsu Limited
    Inventors: Hiroki Ooi, Takafumi Terahara, Kentaro Nakamura, Chihiro Ohshima, Tsuyoshi Yamamoto
  • Patent number: 8934776
    Abstract: A plurality of optical transmission sources provide data communication from a transmitting module to a common detector cooperative with a receiving module, the modules being subject to relative rotation about a shared axis. The detector can be located on the shared axis, each of the sources directing a beam onto the detector regardless of relative module orientation, and/or the light can be diffused, so that it is detected regardless of source and detector placement and relative module orientations. Transmissions can be distinguished according to synchronized timing, differing optical frequencies, differing baud rates, and/or differing circular polarizations. The detector can split the light into a plurality of beams which pass through different optical filters and are thereby distinguished. Cut-off circuits can prevent failed sources from transmitting. A diffused second light source and a second plurality of detectors can provide reverse communication from the receiving module to the transmitting module.
    Type: Grant
    Filed: April 5, 2011
    Date of Patent: January 13, 2015
    Assignee: BAE Systems Information and Electronic Systems Integration Inc.
    Inventors: James H. Steenson, Jr., Derek P. Janiak, Benjamin W. Brown
  • Patent number: 8886040
    Abstract: The invention relates to techniques for controlling a dynamic hitless resizing in data transport networks. According to a method aspect of the invention, a network connection comprises M tributary slots defined in a payload area of a higher order transport scheme of the data transport network and the method comprises the steps of receiving a connection resize control signal at each of the nodes along the path of the network connection; adding at each node along the path in response to the connection resize control signal a second set of N tributary slots to the first set of the M tributary slots, such that the network connection comprises M+N tributary slots; and increasing, after M+N tributary slots are available for the network connection at each node along the path, a transport data rate of the network connection.
    Type: Grant
    Filed: March 19, 2012
    Date of Patent: November 11, 2014
    Assignee: Huawei Technologies Co., Ltd.
    Inventors: Maarten Vissers, Yang Yang, Huub van Helvoort, Wei Su
  • Publication number: 20140321853
    Abstract: Multiple switch planes, each having meshed bufferless switch units, connect source nodes to sink nodes to form a communications network. Each directed pair of source and sink nodes has a first-order path traversing a single switch unit in a corresponding switch plane and multiple second-order paths each traversing two switch units in one of the remaining switch planes. To reduce processing effort and minimize requisite switching hardware, connectivity patterns of source nodes and sink nodes to the switch planes are selected so that each pair of source node and sink node connects only once to a common switch unit. Widely-varying flow rates may be allocated from each source node to the sink nodes. To handle frequent changes of flow-rate allocations, in order to follow variations of traffic distribution, a high-throughput scheduling system employing coordinated multiple scheduler units is provided in each switch plane.
    Type: Application
    Filed: July 5, 2014
    Publication date: October 30, 2014
    Inventor: Maged E. Beshai
  • Publication number: 20140321852
    Abstract: A modular optical switch includes a set of optical switch modules connected in a mesh, a master controller for the whole optical node and a switch-module controller for each of the optical switch modules. The optical switch modules receive optical signals from, and transmit optical signals to, edge nodes based on connection requests received from the edge nodes. The master controller acts to select a path, using a simple or compound time-slot matching process, through the mesh of switch modules for each optical signal related to a connection request. Advantageously, the optical switch modules are fast switching, enabling the use of time-sharing schemes such as TDM, and the modular optical core node is made practical by efficient path selection at the master controller. A hybrid modular switch may include both optical and electronic switch modules, a master controller, and a switch-module controller for each of the switch modules.
    Type: Application
    Filed: June 27, 2014
    Publication date: October 30, 2014
    Inventor: Maged E. BESHAI
  • Patent number: 8873955
    Abstract: Scheduling methods and apparatus for use with optical switches with hybrid architectures are provided. An exemplary distributed scheduling process achieves 100% throughput for any admissible Bernoulli arrival traffic. The exemplary distributed scheduling process may be easily adapted to work for any finite round trip time, without sacrificing any throughput. Simulation results also showed that this distributed scheduling process can provide very good delay performance for different traffic patterns and for different round trip times associated with current switches.
    Type: Grant
    Filed: October 25, 2011
    Date of Patent: October 28, 2014
    Assignee: Polytechnic Institute of New York University
    Inventors: Shivendra S. Panwar, Yanming Shen, Shunyuan Ye
  • Publication number: 20140308037
    Abstract: A network switch is disclosed with each port having the function of: electrical processing and optical modulation; electrical processing has the ability to identify packet or frame destination; burst mode transmission and receiving capability; uses its pre-assigned time slot to send to the corresponding destination, or receive from the expected source.
    Type: Application
    Filed: April 2, 2014
    Publication date: October 16, 2014
    Applicant: NEC Laboratories America, Inc.
    Inventors: Junqiang Hu, Ting Wang
  • Patent number: 8849116
    Abstract: An exemplary method and apparatus are provided for data transmission in an optical transport network that includes receiving client data from a client, mapping the client data into a frame structure, mapping the frame structure into tributary slots of a data transport structure, and transmitting the data transport structure. The data transport structure contains a fixed number of tributary slots and the size of the frame structure is selectable in granularity of the tributary slots of the data transport structure.
    Type: Grant
    Filed: March 9, 2010
    Date of Patent: September 30, 2014
    Assignee: Alcatel Lucent
    Inventors: Alberto Bellato, Pietro Vittorio Grandi, Matteo Gumier, Sergio Belotti, Stephen John Trowbridge
  • Publication number: 20140255022
    Abstract: An embodiment of the present invention provides an optical burst synchronization method. A synchronization method includes: selecting a reference chassis, and transmitting, by an output port corresponding to an FTL in the reference chassis, an optical burst test signal respectively to receive ports corresponding to ORs in other line card chassis, where the optical burst test signal carries a transmission timeslot number; and acquiring, by a receive port corresponding to an OR in each line card chassis, according to an optical path difference between the receive port corresponding to the OR in each line card chassis and the output port corresponding to the FTL in the reference chassis, time of receiving the optical burst test signal, and the transmission timeslot number, a time-phase difference between each line card chassis and the reference chassis, and calibrating a local clock phase according to the time-phase difference.
    Type: Application
    Filed: May 22, 2014
    Publication date: September 11, 2014
    Applicant: Huawei Technologies Co., Ltd.
    Inventor: Qiwen Zhong
  • Patent number: 8798462
    Abstract: An optical packet switching system includes an optical packet generator for generating an optical packet signal, an optical packet switching unit, provided with an optical switch, for switching the route of an inputted optical packet signal by controlling on/off of the optical switch, and an optical signal-to-noise ratio measuring unit for measuring the optical signal-to-noise ratio of the optical packet signal outputted from the optical packet switching unit. When switching the route of the optical packet signal, the optical packet switching unit outputs an optical packet signal with optical noise by keeping the optical switch on longer than the time width of the packet signal. The optical signal-to-noise ratio measuring unit measures the optical signal power and the optical noise power, respectively, in the optical packet signal with optical noise and measures the optical signal-to-noise ratio by calculating the ratio between the optical signal power and the optical noise power.
    Type: Grant
    Filed: May 17, 2012
    Date of Patent: August 5, 2014
    Assignee: Fujitsu Telecom Networks Limited
    Inventor: Shota Mori
  • Patent number: 8798465
    Abstract: An optical path switching type optical signal transmission/reception apparatus includes a one-to-seven compatible optically controlled optical path switching apparatus 100 that is connected to a host optical signal transmission/reception apparatus 1 via an optical fiber, a total of seven subordinate optical communication adapters 110 connected via optical fibers, user side devices 160 connected to respective subordinate optical communication adapters via an electric circuit, an optical transmission/reception control circuit provided in each of the total of seven subordinate user side optical communication adapters 110, and including an uplink optical signal transmission mechanism, a downlink optical signal reception mechanism, a control light source that can generate control light to drive the optical path switching apparatus 100, in which a wavelength of the generated control light is different from a wavelength of signal light, and an optical communication oriented transmission/reception mechanism using the
    Type: Grant
    Filed: April 14, 2010
    Date of Patent: August 5, 2014
    Assignees: Dainichiseika Color & Chemicals Mfg. Co., Ltd., Inter Energy Co., Ltd., National Institute of Advanced Industrial Science and Technology
    Inventors: Norio Tanaka, Shigeru Takarada, Hirobumi Watanabe, Shiro Futaki, Ichiro Ueno, Takashi Hiraga, Noritaka Yamamoto
  • Publication number: 20140199067
    Abstract: A method, comprises measuring, by circuitry of a computer system, a first bandwidth of data traffic of a transport path over a time period, the transport path passing through a plurality of nodes and conforming to a protocol using a number of time slots to allocate a second bandwidth to the transport path. The method further includes passing a signal, from the computer system to at least one of the nodes of the transport path, the signal including at least one instruction that when executed by circuitry of the at least one node causes a change to the number of time slots allocated to the transport path.
    Type: Application
    Filed: June 28, 2013
    Publication date: July 17, 2014
    Inventors: Satyajeet Ahuja, Ping Pan, Rajan Rao, Biao Lu
  • Patent number: 8774621
    Abstract: In a communication line switching method for an optical communications system in which a station-side line terminal apparatus and user-side line terminal apparatuses are connected via a plurality of redundant physical lines, the discovery of the station-side optical line terminal registering the user-side line terminal apparatuses, wherein the registered user-side line terminal apparatuses monitoring a time stamp drift error that is generated when a difference between a time stamp included in a received signal and a local time measured by the own apparatus is larger than a value set in advance and, when the time stamp drift error occurs, shifting to a deregistered state and waiting for registration by the discovery. The station-side line terminal apparatus switches a physical line from a working physical line to a backup physical line of the physical lines.
    Type: Grant
    Filed: November 25, 2010
    Date of Patent: July 8, 2014
    Assignee: Mitsubishi Electric Corporation
    Inventor: Hiroaki Mukai
  • Patent number: 8737833
    Abstract: In a communication line switching method for an optical communications system in which a station-side line terminal apparatus and user-side line terminal apparatuses are connected via a plurality of redundant physical lines, the discovery of the station-side optical line terminal registering the user-side line terminal apparatuses, wherein the registered user-side line terminal apparatuses monitoring a time stamp drift error that is generated when a difference between a time stamp included in a received signal and a local time measured by the own apparatus is larger than a value set in advance and, when the time stamp drift error occurs, shifting to a deregistered state and waiting for registration by the discovery. The station-side line terminal apparatus switches a physical line from a working physical line to a backup physical line of the physical lines.
    Type: Grant
    Filed: November 25, 2010
    Date of Patent: May 27, 2014
    Assignee: Mitsubishi Electric Corporation
    Inventor: Hiroaki Mukai
  • Publication number: 20140079393
    Abstract: A system, method, and optical switch for communicating timing. A determination is made whether one of a number of data streams are available. Packets are received at a remote node in response to determining one of the number of data streams is available. A timing characteristic of the at least one of the packets is associated with a tick of a reference clock. The tick of the reference clock is extracted utilizing the timing characteristic of the at least one of the packets. A secondary clock is disciplined with the reference clock by adjusting the secondary clock based on a difference between times measured by the reference clock and the secondary clock to generate a clock signal. The clock signal is communicated to one or more interfaces for distributing.
    Type: Application
    Filed: December 3, 2013
    Publication date: March 20, 2014
    Applicant: CENTURYLINK INTELLECTUAL PROPERTY LLC
    Inventors: Gregory A. Wolfe, Michael Bugenhagen
  • Patent number: 8660427
    Abstract: A method and apparatus for control and data burst routing in WDM photonic burst-switched network is disclosed. In one embodiment, only the control bursts and network management labels are going through optical-electrical-optical conversion inside the photonic burst switching (PBS) module. The building blocks of the control processing unit inside the PBS module may include input and output buffers, control burst parser, burst scheduler, PBS configuration and control, contention resolution, forwarding engine, network management controller, control burst generator, and queue manager. The contention resolution block may be used to resolve resource contention between multiple data bursts. Such contention resolution may take the form of adding additional delays to one of the data bursts, changing one of the data bursts to an alternate wavelength, or dropping some of the data bursts based on various criteria such as relative priority and wavelength.
    Type: Grant
    Filed: September 13, 2002
    Date of Patent: February 25, 2014
    Assignee: Intel Corporation
    Inventor: Shlomo Ovadia
  • Patent number: 8644333
    Abstract: The present invention discloses a method for realizing cross-connect of optical channel data units (ODUk), which comprises: mapping the accessed services to the ODUk, and mapping the services mapped to the ODUk to the ODUk time slot frames according to the requirements of the time slot frames; mapping the ODUk time slot frames to the intermediate frame structures; performing the cross-connect for ODUk services in the intermediate frame structures. The present invention also discloses an apparatus for realizing cross-connect of ODUk. The present invention directly supports cross-connect of ODUk, so as to realize simple scheduling for the Optical Transport Network (OTN) services, and improve the resource utilization factor and the integration level.
    Type: Grant
    Filed: September 28, 2009
    Date of Patent: February 4, 2014
    Assignee: ZTE Corporation
    Inventors: Yuxian Wei, Yan Yuan
  • Patent number: 8639115
    Abstract: A bidirectional optical network, in which an incoming/downstream modulated optical signal(s) of a particular wavelength may carry content from a headend to a subscriber. An incoming/downstream unmodulated continuous wave optical signal(s) from the headend is time-shifted (i.e., time delayed with respect to just received incoming/downstream optical signal(s)), collected, modulated and sent back as return/upstream optical signal(s) from the subscriber to the headend. The return/upstream optical signal(s) may have the same wavelength or a slightly shifted wavelength relative to incoming/downstream optical signal(s). Wavelength, bandwidth, subscriber priority and service (content) provider may be fixed, dynamically, or statistically assigned. A modulated marker optical signal(s) is sent along with a modulated data optical signal simultaneously in a different plane. The modulated data optical signal(s) can therefore be securely delivered to a subscriber(s) according to the marker identification.
    Type: Grant
    Filed: October 19, 2010
    Date of Patent: January 28, 2014
    Assignee: Dorica Properties NY LLC
    Inventor: Mohammad A. Mazed
  • Patent number: 8631151
    Abstract: Methods, systems, and apparatus guarantee bandwidth for a network transaction. A network is logically organized as a tree having a plurality of nodes. Each node can guarantee service for a network transaction through the network. Each node monitors its traffic and reserves predefined amounts of unused bandwidth with its adjacent node. If a particular node needs additional bandwidth, that node borrows the bandwidth from its adjacent node.
    Type: Grant
    Filed: May 18, 2006
    Date of Patent: January 14, 2014
    Assignee: Intel Corporation
    Inventor: Hua You
  • Publication number: 20130259477
    Abstract: The present invention relates to a method and apparatus for reducing the resource utilization of the switching fabric in a SONET/SDH multiplexer by switching data on a TU level instead of byte or column level.
    Type: Application
    Filed: March 29, 2013
    Publication date: October 3, 2013
    Inventors: Prashant Prabhakar DABHOLKAR, Devendra Kumar CHAUDHARY
  • Publication number: 20130259476
    Abstract: A transmission method for transmitting a lower-speed signal transmission frame using a node device in a network by accommodating the lower-speed signal transmission frame into time slots of a higher-speed signal transmission frame includes supplying, when a number of the time slots accommodating the lower-speed signal transmission frame is to be increased, the time slots to input numbers of a cross-connection part of the node device in accordance with an order of time slot numbers of the time slots; and re-establishing cross-connections where the input numbers are cross-connected to corresponding output numbers of the cross-connection part so that the cross-connections are prevented from crossing each other, wherein the input numbers input the time slots and the output numbers output the time slots.
    Type: Application
    Filed: March 20, 2013
    Publication date: October 3, 2013
    Applicant: FUJITSU LIMITED
    Inventors: Shota SHINOHARA, Wataru Odashima, Hiroyuki Homma, Junichi Sugiyama
  • Patent number: 8548324
    Abstract: The present invention discloses a method and an apparatus for adjusting a service of optical synchronous digital hierarchy network, and the method comprises: at first configuring the input time-slot space-division cross path to the time-division module after adjustment in space-division module and the time-division cross path of the time-division module after adjustment; and configuring the output time-slot space-division cross path from the time-division module after adjustment in space-division module; deleting the original cross path formed by the time-division module before adjustment.
    Type: Grant
    Filed: September 11, 2009
    Date of Patent: October 1, 2013
    Assignee: ZTE Corporation
    Inventors: Xiaoping Tu, Jun Lv
  • Patent number: 8542996
    Abstract: An optical packet switching apparatus includes an optical coupler, an optical switch unit, and an optical switch control unit. The optical switch control unit includes an optical-to-electrical converter, a serial/parallel converter, an arrangement detector, a rearrangement unit, a frame synchronization unit, a route detector, a control signal generator, and an adjustment unit for adjusting the timing with which to output an optical switch control signal to the optical switch unit, based on arrangement information on a frame synchronization pattern fed from the arrangement detector.
    Type: Grant
    Filed: March 7, 2011
    Date of Patent: September 24, 2013
    Assignee: Fujitsu Telecom Networks Limited
    Inventors: Wataru Kawasaki, Shota Mori
  • Patent number: 8543957
    Abstract: An optical network design apparatus includes a memory and a processor. The memory stores a connection limit corresponding to the number of connections between ports. The processor provisionally designs a traffic path across an optical network independently of a connection limit of an asymmetric optical hub, calculates a penalty allowance with respect to the penalty limit of the traffic path, calculates an additional penalty caused on a detour path derived by replacing a port with a replacement port in the asymmetric optical hub, and if an asymmetric optical hub is included in the detour path, generates asymmetric optical hub information about the included asymmetric optical hub, generates, based on the connection limit, penalty allowance, additional penalty, and asymmetric optical hub information, a constraint condition for adopting the traffic path satisfying the connection limit and penalty limit, and calculates the traffic path by mathematical programming under the constraint condition.
    Type: Grant
    Filed: June 3, 2011
    Date of Patent: September 24, 2013
    Assignee: Fujitsu Limited
    Inventors: Yutaka Takita, Tomohiro Hashiguchi, Kazuyuki Tajima
  • Publication number: 20130243429
    Abstract: Data locality constraints are alleviated by a data processing system and method of reorganizing data. Multiple electronic components are configured to modulate a light beam on a shared photonic interconnect and to detect the data according to a global schedule to reorganize data across the multiple electronic components. By constructing data transfer patterns in a shared photonic interconnect, rather than in dedicated reorganization hardware, data is reorganized while in transit, greatly accelerating the reorganization of data, and reducing the amount of power-consuming hardware necessary to achieve the task.
    Type: Application
    Filed: May 22, 2012
    Publication date: September 19, 2013
    Applicant: Massachusetts Institute of Technology
    Inventors: David J. Whelihan, Scott M. Sawyer, Jeffrey J. Hughes
  • Patent number: 8515279
    Abstract: A crossconnect for asynchronous OTN signals operates synchronously internally at an internal clock rate. Received OTN signals are synchronized to an internal frame format by stuffing. The synchronized signals are parallelized and switched with a switching matrix comprising synchronously operating integrated circuits that operate at the internal clock rate. At the output, the synchronized signals are again destuffed and are transmitted again at the original bit rate.
    Type: Grant
    Filed: June 15, 2011
    Date of Patent: August 20, 2013
    Assignee: Alcatel Lucent
    Inventor: Michael Joachim Wolf
  • Patent number: 8509617
    Abstract: A node, a data processing system, and a data processing method are provided. The node includes a control module, adapted to generate synchronization information and Optical Burst (OB) configuration information; at least one synchronization processing module, adapted to perform a synchronization process on OB paths at a plurality of wavelengths according to the synchronization information; and a cross-connection module, adapted to perform, a cross-connection process on the OB paths, on which the synchronization process has been performed. The data processing system includes at least two nodes, where the nodes are connected through OB paths at one or more wavelengths, and the nodes are adapted to transfer service data through the OB paths. The technical solutions can reduce volume, power consumption, and costs of the nodes, and avoid a problem of generation of data conflict on an optical layer due to lack of optical buffers in all optical switching.
    Type: Grant
    Filed: December 29, 2010
    Date of Patent: August 13, 2013
    Assignee: Huawei Technologies Co., Ltd.
    Inventor: Shiyi Cao
  • Patent number: 8488964
    Abstract: In an access network using optical switches, communications between an OLT and ONUs are established without a photoelectric conversion performed at an optical switching unit. The OLT controls the downlink optical switch SW(DOWN) to sequentially select each ONU in slots arranged in a discrete manner, and transmits a Discovery Gate message. Upon receipt of the Discovery Gate message, each ONU consecutively transmits Register Request messages. The uplink optical switch SW(UP) sequentially switch signals from ONU#1 through ONU#128 in the slots arranged in a discrete manner, and outputs the signals to the OLT, Some of the Register Requests transmitted from the respective ONUs pass through the SW(UP), and reach the OLT. Based on the received Register Requests, the OLT determines the timing of transmission for the ONUS, and notifies the ONUS of the timing of transmission through a Gate message.
    Type: Grant
    Filed: July 3, 2009
    Date of Patent: July 16, 2013
    Assignee: Keio University
    Inventors: Naoaki Yamanaka, Yutaka Arakawa, Kazumasa Tokuhashi
  • Publication number: 20130156427
    Abstract: The present invention concerns an AFDX network which is extended by a passive optical network or PON. The AFDX network comprises an AFDX switch to which are connected a plurality of equipments. The AFDX switch constitutes the optical line termination and said equipments constitute the optical network terminations of the PON. The PON broadcasts over the downlink, to all said equipments, every AFDX frame output by said AFDX switch. It also multiplexes over the uplink the AFDX frames transmitted by the same equipments. The invention also concerns an ?AFDX network using a PON.
    Type: Application
    Filed: December 14, 2012
    Publication date: June 20, 2013
    Applicant: AIRBUS OPERATIONS (SAS)
    Inventor: AIRBUS OPERATIONS (S.A.S.)
  • Patent number: 8451147
    Abstract: In an illustrative embodiment, a data interface circuit is provided. The data interface circuit comprises data sources, input blocks, a space switch, output blocks and a multi-core processor. The data interface circuit allows data provided in different voltage ranges and sampling frequencies to be transmitted to the appropriate core in the multi-core processor via the switch. Data conversion elements in the input blocks convert data from the data sources and having varying voltage ranges and sampling frequencies into data having a voltage range and sampling frequency suitable for the space switch. Analogously, data conversion elements in the output blocks convert data from the space switch into data having a voltage range and sampling frequency suitable for the corresponding core in the multi-core processor. In one embodiment, level shifters and FIFO buffers are used in the input blocks and output blocks.
    Type: Grant
    Filed: October 18, 2010
    Date of Patent: May 28, 2013
    Assignee: M.S. Ramaiah School of Advanced Studies
    Inventors: Dipayan Mazumdar, Cyril P Raj