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    • 3. 发明申请
    • Protection for Fibre Optic Access Networks
    • 光纤接入网络保护
    • US20140199062A1
    • 2014-07-17
    • US14117406
    • 2011-05-17
    • Einar In De BetouStefan DahlfortDavid HoodPeter Öhlén
    • Einar In De BetouStefan DahlfortDavid HoodPeter Öhlén
    • H04B10/032
    • H04B10/032H04B10/25753H04J14/0287H04W24/04H04W88/085
    • An Optical Network Unit, ONU, and an Optical Line Terminal, OLT, as well as a respective method therein, are provided for enabling the ONU to communicate with the OLT. The ONU and at least one OLT are comprised in a passive fibre optic access network. The passive fibre optic access network comprises two fibre paths through the network, a main fibre path and a back-up fibre path, connecting the ONU with the OLT. When a fault is detected in the main fibre path is detected, transmission rate negotiation is performed between the ONU and the OLT over the back-up path. When a transmission rate is agreed upon between the ONU and the OLT during said transmission rate negotiation with regard to communication over the back-up path, the communication between the ONU and the OLT is executed using the agreed transmission rate over the back-up path.
    • 光网络单元,ONU和光线路终端,OLT以及其中的相应方法被提供用于使得ONU能够与OLT通信。 ONU和至少一个OLT包括在无源光纤接入网络中。 无源光纤接入网络包括通过网络的两条光纤路径,主光纤路径和备用光纤路径,将ONU与OLT连接起来。 当在主光纤路径中检测到故障时,通过备用路径在ONU与OLT之间进行传输速率协商。 当在通过备用路径的通信的所述传输速率协商期间在ONU与OLT之间达成传输速率时,ONU和OLT之间的通信是通过备用路径的约定的传输速率来执行的 。
    • 5. 发明授权
    • Hilbert ordering of multidimensional tuples within computing systems
    • 计算系统中多维元组的希尔伯特排序
    • US09146948B2
    • 2015-09-29
    • US11609531
    • 2006-12-12
    • Robin GrossetDavid Hood
    • Robin GrossetDavid Hood
    • G07F17/30G06F17/30
    • G06F17/30327G06F17/30333
    • A system provides multidimensional tuple Hilbert ordering within a linear storage structure to enable more consistent and efficient access to stored multidimensional tuples. The database system comprises a tuple storage module that receives multidimensional data elements, where each multidimensional data element is defined by a plurality of different object types, and where each object is associated with a different dimension within a multidimensional data space. The tuple storage module further forms a respective tuple for each of the multidimensional data elements by mapping each object to an associated reference and applies a Hilbert function to the references of each of the tuples to determine a respective Hilbert ordering for each of the tuples. The system further comprises a linear data storage structure that includes a B-tree for storing the Hilbert ordering.
    • 系统在线性存储结构中提供多维元组希尔伯特(Hilbert)元组排序,以便更加一致和有效地访问存储的多维元组。 数据库系统包括接收多维数据元素的元组存储模块,其中每个多维数据元素由多个不同对象类型定义,并且其中每个对象与多维数据空间内的不同维度相关联。 元组存储模块还通过将每个对象映射到相关联的引用来为每个多维数据元素形成相应的元组,并将希尔伯特函数应用于每个元组的引用,以确定每个元组的相应希尔伯特顺序。 该系统还包括线性数据存储结构,其包括用于存储希尔伯特(Hilbert)顺序的B树。
    • 6. 发明授权
    • Sequence-based link fault localization
    • 基于序列的链路故障定位
    • US09002197B2
    • 2015-04-07
    • US13677263
    • 2012-11-14
    • Stefan DahlfortPeter ÖhlénKim LaraquiDavid Hood
    • Stefan DahlfortPeter ÖhlénKim LaraquiDavid Hood
    • H04B10/079H04L12/26H04L12/24H04B10/077
    • H04L12/2639H04B10/0771H04L41/0677H04L41/0686H04L43/0811H04L43/0864H04L43/106
    • Methods and apparatus for a network element or server end station to determine an estimated physical location of a fault in a communications link utilized by two network elements. In an embodiment, the first and second network elements generate link failure indications including time values representing when the respective network element detected the fault. In other embodiments, the link failure indications include time values transmitted over the communications link between the first and second network elements. A time distance between these time values is calculated, which is used to calculate the estimated physical location of the fault. In some embodiments, the link failure indications include sequence numbers transmitted or about to be transmitted over the communications link between the network elements. Sequence distances are calculated between the sequence numbers, and are used to calculate the estimated physical location of the fault.
    • 网络元件或服务器终端站的方法和装置,用于确定由两个网络元件使用的通信链路中的故障的估计物理位置。 在一个实施例中,第一和第二网络元件产生链路故障指示,包括表示相应网络元件何时检测到故障的时间值。 在其他实施例中,链路故障指示包括通过第一和第二网络元件之间的通信链路发送的时间值。 计算这些时间值之间的时间距离,用于计算故障的估计物理位置。 在一些实施例中,链路故障指示包括通过网络元件之间的通信链路发送或将要发送的序列号。 在序列号之间计算序列距离,并用于计算故障的估计物理位置。
    • 7. 发明申请
    • Method for protection of multi-wavelength passive optical network
    • 多波长无源光网络保护方法
    • US20140093232A1
    • 2014-04-03
    • US13632463
    • 2012-10-01
    • David Hood
    • David Hood
    • H04J14/02
    • H04J14/0297H04B10/032H04J14/0246H04J14/025H04J14/0282H04J14/0295
    • An Optical Line Termination (OLT) system in a multi-wavelength Passive Optical Network (PON) includes a protection port for protecting a set of OLT ports without the use of a physical switch. The protection port has a tunable transceiver. The OLT system detects a failure of one of the OLT ports, which was originally adapted to transmit downstream traffic to a subset of ONUs on a downstream wavelength and to receive upstream traffic from the subset of ONUs on an upstream wavelength. In response to the detection, the OLT system tunes the protection port to the downstream wavelength for transmission and to the upstream wavelength for reception, and resumes communication between the OLT system and the subset of ONUs through the protection port instead of the OLT port.
    • 多波长无源光网络(PON)中的光线路终端(OLT)系统包括保护端口,用于在不使用物理交换机的情况下保护一组OLT端口。 保护端口具有可调谐收发器。 OLT系统检测到一个OLT端口的故障,其最初适用于向下游波长的ONU的子集发送下行流量,并且接收来自上行波长的ONU子集的上行流量。 响应检测,OLT系统将保护端口调整到下行波长进行传输,并将波长上升到接收的波长,通过保护端口而不是OLT端口恢复OLT系统与ONU子集之间的通信。