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    • 3. 发明授权
    • Method and system for path protection in a communications network
    • 通信网路径保护方法及系统
    • US06992978B1
    • 2006-01-31
    • US09324454
    • 1999-06-02
    • Pierre A. HumbletBruce D. MillerRaj ShanmugarajSteven SherryPeter B. BeaulieuMichael W. FortunaMichael C. YipWilliam Abraham
    • Pierre A. HumbletBruce D. MillerRaj ShanmugarajSteven SherryPeter B. BeaulieuMichael W. FortunaMichael C. YipWilliam Abraham
    • H04J11/06H04J3/14
    • H04L12/66H04L45/28
    • A system and method for fast and reliable failure notification and accelerated switchover for path protection in a communications network having several overlapping areas of nodes interconnected by communications links is described. Upon a failure event involving one of the communications links, a failure message is broadcast identifying the failed link, the broadcast being confined within the areas which include the failed link. A reliable transmission protocol is provided wherein at one or more of the nodes, a LAPD protocol unnumbered information frame containing the failure message is sent to connected nodes. The failure message is resent in another unnumbered information frame after a time interval unless an unnumbered acknowledgment frame containing or referencing the failure message is received from the connected node. A method of path protection includes establishing plural working paths through the nodes. For each working path, an associated protection path is precalculated. A priority is assigned to each working path and associated protection path. A protection path is precalculated for each area through which a particular working path traverses. Upon a failure event, working paths that include the failed link are switched to their respective protection paths. Higher priority protection paths can preempt lower priority paths that share at least one link. At each node, linked lists for protection path activation, working path deactivation and path preemption are implemented upon a failure event.
    • 描述了一种用于在具有通过通信链路互连的几个重叠区域的通信网络中的用于快速可靠的故障通知和用于路径保护的加速切换的系统和方法。 在涉及通信链路中的一个的故障事件时,广播识别故障链路的故障消息,广播被限制在包括故障链路的区域内。 提供了可靠的传输协议,其中在一个或多个节点处,将包含故障消息的LAPD协议无编号信息帧发送到连接的节点。 在一段时间间隔之后,在另一个未编号的信息帧中重新发送失败消息,除非从连接的节点接收到包含或引用失败消息的未编号的确认帧。 一种路径保护方法包括:通过节点建立多个工作路径。 对于每个工作路径,预先计算相关的保护路径。 优先级被分配给每个工作路径和相关联的保护路径。 对于特定工作路径穿过的每个区域,预先计算保护路径。 在发生故障事件时,包括故障链路的工作路径切换到各自的保护路径。 较高优先级的保护路径可以抢占共享至少一个链路的较低优先级路径。 在每个节点,在故障事件时实现用于保护路径激活,工作路径禁用和路径抢占的链表。
    • 4. 发明授权
    • Device, system and method for spectrally shaping transmitted data signals
    • 用于对发射数据信号进行频谱整形的装置,系统和方法
    • US5818879A
    • 1998-10-06
    • US747840
    • 1996-11-13
    • M. Vedat EyubogluPierre A. Humblet
    • M. Vedat EyubogluPierre A. Humblet
    • H04L25/49
    • H04L25/4927
    • A transmitter for transmitting a sequence of octets over a digital network which digital network converts the octets into a sequence of levels for transmission over an analog channel to a receiver, the levels producing an analog signal having a predefined spectral shape, the transmitter including: a mapping device which receives at its input groups of data bits to be transmitted and outputs for each group an equivalence class of one or more levels, wherein at least one equivalence class contains more than one level; a level selector, operably coupled to the mapping device, for selecting the level in the equivalence class to represent the group of data bits to be transmitted; a filter device, operably coupled to the level selector and having a filter response corresponding to the predefined spectral shape, which receives at its input previously selected levels and provides its output to the level selector, wherein the level selector selects the level to be transmitted based on the output of the filter device; and an octet converter, operably coupled to the level selector, which receives the selected level at its input and transmits over the digital network an octet corresponding to the selected level to produce the analog signal having the predefined spectral shape when the transmitted octets are converted to levels in the digital network.
    • 一种用于在数字网络上发送八位字节序列的发射机,该数字网络将八位字节转换成用于通过模拟信道传输到接收机的电平序列,所述电平产生具有预定频谱形状的模拟信号,所述发射机包括: 映射设备,其在其输入的数据位组接收要发送的数据位,并且为每个组输出一个或多个级别的等效类,其中至少一个等价类包含多于一个级; 电平选择器,可操作地耦合到映射设备,用于选择等价类中的电平以表示要发送的数据位组; 滤波器装置,可操作地耦合到电平选择器并且具有对应于预定频谱形状的滤波器响应,其在其输入端接收先前选择的电平并将其输出提供给电平选择器,其中电平选择器选择要发射的电平 在过滤装置的输出上; 以及八位字节转换器,其可操作地耦合到电平选择器,电平选择器在其输入端接收所选择的电平,并在数字网络上传输对应于所选电平的八位字节,以便当发送的八位字节被转换为 数字网络的水平。