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    System and method for restricted reuse of intact portions of failed paths
    3.
    发明授权
    System and method for restricted reuse of intact portions of failed paths 有权
    用于限制重用故障路径的完整部分的系统和方法

    公开(公告)号：US06496476B1

    公开(公告)日：2002-12-17

    申请号：US09151320

    申请日：1998-09-11

    申请人： Sig H. Badt, Jr. ,  Sridhar Alagar ,  Bryan J. McGlade

    发明人： Sig H. Badt, Jr. ,  Sridhar Alagar ,  Bryan J. McGlade

    IPC分类号： G01R3108

    CPC分类号： H04J3/14 ,  H04J2203/006 ,  H04L41/0654 ,  H04L41/12 ,  H04Q3/0062 ,  H04Q3/0079

    摘要： In a path-based distributed restoration algorithm provisioned telecommunications network, the origin and destination nodes of a failed path are apprised of the portions of the path that remain intact by “reuse” messages that are sent from the custodial nodes that are adjacent to the failure. As each reuse message reaches an intermediate node, the node ID of the intermediate node is appended to a field of the message so that, as the reuse messages are propagated along the intact portions of the failed path, a cumulative list of nodes that are encountered by the messages passing from the custodial nodes to the origin and destination nodes is set forth. Thus, the origin/destination node, when in receipt of a reuse message, can read from the field that has the cumulative list of nodes a description of the intact portions remaining from the original path. These intact portions are preferably used only for restoring of the same path that included the portions prior to failure and are not available for restoring any other paths that happened to fail simultaneously.

    摘要翻译： 在提供电信网络的基于路径的分布式恢复算法中，通过从与故障相邻的保管节点发送的“重用”消息来保证路径的部分保持完整的故障路径的起始和目的地节点 。 当每个重用消息到达中间节点时，中间节点的节点ID被附加到消息的字段，使得随着重用消息沿着故障路径的完整部分传播，遇到的节点的累积列表 通过从保管节点传递到源节点和目的地节点的消息被阐明。 因此，起始/目的地节点在接收到重用消息时可以从具有累积节点列表的字段读取从原始路径剩余的完整部分的描述。 这些完整部分优选地仅用于恢复包括故障之前的部分的相同路径，并且不可用于恢复发生同时失败的任何其他路径。

    Method and system for bi-directional path switched network
    6.
    发明授权
    Method and system for bi-directional path switched network 有权
    双向路径交换网络的方法和系统

    公开(公告)号：US07046619B2

    公开(公告)日：2006-05-16

    申请号：US10045955

    申请日：2001-11-06

    申请人： Sridhar Alagar ,  Brian Pheiffer ,  Rohit Sharma ,  Stephane St. Laurent ,  Holden D. Jessup ,  Rainer Iraschko

    发明人： Sridhar Alagar ,  Brian Pheiffer ,  Rohit Sharma ,  Stephane St. Laurent ,  Holden D. Jessup ,  Rainer Iraschko

    IPC分类号： H04L1/00

    CPC分类号： H04J14/0295 ,  H04J14/0227 ,  H04J14/0241 ,  H04J14/0283 ,  H04J14/0284 ,  H04J14/0286 ,  H04J14/0291 ,  H04J14/0294 ,  H04J2203/0042 ,  H04J2203/006 ,  H04L1/22

    摘要： A system for use in a bi-directional path switched ring network for detecting a failed optical path and establishing a protection path so as to allow signals from the failed optical path to be re-routed via the protection path is provided. According to one aspect of the system, upon detecting a failure relating to an optical path, the destination node generates a connection request message for transmission to the source node. The connection request message is passed to the source node via one or more intermediate nodes, if any. Each intermediate node examines the connection request message accordingly reserves the requisite wavelength from the protection capacity so as to allow signals from the failed optical path to be re-routed. Upon receiving the connection request message, the source node readies its switching equipment to re-route signals from the failed optical path and generates an acknowledgment message and propagates it back to the destination node via the intermediate nodes. The intermediate nodes and the destination node, upon receipt of the acknowledgement message, also ready their respective switching equipment to carry the re-routed signals via the previously reserved wavelength from the protection capacity. According to another aspect of the system, a contention resolution mechanism is provided to resolve contending connection request messages received at a node requesting the same wavelength to be reserved from the protection capacity for different failed optical paths. A message format is used for the connection request which allows the connection request message to include information relating to the type of failure experienced by a failed optical path and other priority data. Such information is then used by a node to determine priority between two contending connection request messages.

    摘要翻译： 提供一种用于双向路径交换环网的系统，用于检测故障光路并建立保护路径，以便允许来自故障光路的信号经由保护路径重新路由。 根据系统的一个方面，在检测到与光路相关的故障时，目的节点生成用于传输到源节点的连接请求消息。 连接请求消息通过一个或多个中间节点（如果有的话）被传递到源节点。 相应地，检查连接请求消息的每个中间节点保留来自保护容量的所需波长，以便允许来自故障光路的信号被重新路由。 在接收到连接请求消息时，源节点准备其交换设备以重新路由来自故障光路的信号，并产生确认消息，并经由中间节点将其传播回目的地节点。 中间节点和目的地节点在接收到确认消息时也准备好它们各自的交换设备，以经由先前保留的波长从保护容量携带重新路由的信号。 根据该系统的另一方面，提供了一种争用解决机制，以解决在针对不同的故障光路径的保护容量中要求保留相同波长的节点处接收到的竞争连接请求消息。 用于连接请求的消息格式，其允许连接请求消息包括与由故障光路和其他优先级数据经历的故障类型有关的信息。 这样的信息然后被节点用来确定两个竞争连接请求消息之间的优先级。

    Method of coordinating the respective operations of different restoration processes
    7.
    发明授权
    Method of coordinating the respective operations of different restoration processes 有权
    协调不同恢复过程各自操作的方法

    公开(公告)号：US06456589B1

    公开(公告)日：2002-09-24

    申请号：US09149590

    申请日：1998-09-08

    申请人： Jasvantrai C. Shah ,  Lee D. Bengston ,  Mark W. Sees ,  Sridhar Alagar ,  Bryan McGlade ,  Hal Badt

    发明人： Jasvantrai C. Shah ,  Lee D. Bengston ,  Mark W. Sees ,  Sridhar Alagar ,  Bryan McGlade ,  Hal Badt

    IPC分类号： G01R3108

    CPC分类号： H04L45/00 ,  H04L41/0654 ,  H04L45/22

    摘要： In a telecommunications network provisioned with different types of restoration processes, to ensure that the operation of one restoration process does not infringe upon other nodes that are actively executing a different restoration process, a request is sent by one of the restoration processes, under the guise of the operation system that oversees that process, to the operation system that oversees the other restoration process. The controller of the nodes that are performing the other restoration process, in receipt of the request, sends a disable restoration process message to those nodes under its control. Each of those nodes, upon receipt of the disable restoration process message, would disable the restoration process it is provisioned with so long as it is not actively engaging in that restoration process. If it is, it will continue to execute that restoration process until a safe stop point is reached, at which time it ceases that restoration process. Upon cessation of the particular restoration process, the node sends an acknowledge message to its controller, which, when in receipt of such acknowledge message from all of the nodes under its control, sends a disable acknowledged message to the controller of the first restoration process informing the latter that the nodes under its control can now be operated using the first restoration process. The above method is applicable to a telecommunications network provisioned with multiple layers of restoration processes including for example DRA, RTR and centralized restoration.

    摘要翻译： 在提供不同类型的恢复过程的电信网络中，为了确保一个恢复过程的操作不侵犯正在主动执行不同恢复过程的其他节点，请求由恢复过程中的一个以伪装方式发送 监督该过程的操作系统，涉及监督其他恢复过程的操作系统。 正在执行其他恢复过程的节点的控制器在接收到请求时，向其控制的那些节点发送禁用恢复过程消息。 在接收到禁用恢复处理消息之后，这些节点中的每一个都将禁用其被提供的恢复过程，只要其没有主动参与该恢复过程。 如果是这样，它将继续执行恢复过程，直到达到安全停止点，此时停止恢复过程。 在停止特定恢复过程时，节点向其控制器发送确认消息，当其在其控制下的所有节点接收到这种确认消息时，向第一恢复过程的控制器发送禁用确认消息，通知 后者现在可以使用第一恢复过程来操作其控制下的节点。 上述方法适用于提供多层恢复处理的电信网络，包括例如DRA，RTR和集中恢复。

    Method of exercising a distributed restoration process in an operational telecommunications network
    8.
    发明授权
    Method of exercising a distributed restoration process in an operational telecommunications network 有权
    在运营电信网络中执行分布式恢复过程的方法

    公开(公告)号：US06404733B1

    公开(公告)日：2002-06-11

    申请号：US09148943

    申请日：1998-09-08

    申请人： Jasvantrai C. Shah ,  John David Allen ,  Sridhar Alagar ,  Bryan McGlade ,  Hal Badt

    发明人： Jasvantrai C. Shah ,  John David Allen ,  Sridhar Alagar ,  Bryan McGlade ,  Hal Badt

    IPC分类号： H04L100

    CPC分类号： H04L1/24

    摘要： In a telecommunications network provisioned with a distributed restoration scheme, to determine the reactions and responses of the network while the network is “live” or operational, an exercise information message is provided to the network for presenting a simulated failure or failures thereto. This exercise information message is broadcast to all of the nodes of the network so that every node is aware of the simulated failure scenario. Modified DRA messages that indicate that they are exercise only messages are used by the nodes for executing the exercise restoration process. Such exercise restoration process will proceed as if an actual failure has occurred with the notable exception that no actual cross-connections will be made. Certain functionalities are provisioned to the nodes to allow the exercise restoration process to be aborted if a real failure is detected or upon the expiration of a timer. The exercise restoration process can also be terminated by a command from the network management.

    摘要翻译： 在提供分布式恢复方案的电信网络中，为了在网络“直播”或运行时确定网络的反应和响应，向网络提供锻炼信息消息以呈现模拟的故障或故障。 该运动信息消息被广播到网络的所有节点，使得每个节点都知道模拟的故障情形。 指示它们是仅锻炼消息的修改的DRA消息被节点用于执行锻炼恢复过程。 这样的运动恢复过程将继续进行，好像发生了实际的故障，唯一的例外是没有实际的交叉连接。 某些功能被提供给节点，以允许在检测到真实故障或定时器到期时中止锻炼恢复过程。 锻炼恢复过程也可以通过来自网络管理的命令终止。