公开(公告)号：US08416814B2

公开(公告)日：2013-04-09

申请号：US12705660

申请日：2010-02-15

申请人： Alon Shtern ,  Alex Tal ,  Guy Kronenthal ,  Raz Korn ,  Ziv Barak ,  Osnat Shasha

发明人： Alon Shtern ,  Alex Tal ,  Guy Kronenthal ,  Raz Korn ,  Ziv Barak ,  Osnat Shasha

IPC分类号： H04J3/06

CPC分类号： H04L12/66 ,  H04J3/0664 ,  H04L65/80 ,  H04L69/28

摘要： An improved system and method for achieving high precision clock recovery, i.e. reconstruction of the clock signal having the same frequency, over a packet switched network. The proposed method utilizes a minimum network delay approach, which overcomes the problems caused by delay variation of the network and filters out network jitter, such as noise jitter and other “singular” anomalies causing latency deviations. Minimum network delay is defined herein as the time delay in which a packet remains in the network under assumption that all transmission queues through which the packet passes are empty. The proposed system and method perform clock recovery by including an improvement in the form of dynamically varying thresholds. Reconstruction of the clock signal is performed in accordance with the minimum network delay estimation based on an adjustable threshold, i.e., the latency change threshold, which increases when the noise threshold increases and decreases when the noise threshold decreases. This allows detection of latency changes in accordance with the dynamically varying network conditions and avoids false latency change detections.

摘要翻译： 一种用于实现高精度时钟恢复的改进的系统和方法，即通过分组交换网络重建具有相同频率的时钟信号。 所提出的方法采用最小网络延迟方法，克服了由网络延迟变化引起的问题，并滤除了网络抖动，如噪声抖动和引起延迟偏差的其他奇异异常。 在这里将最小网络延迟定义为假设分组通过的所有传输队列为空的分组保留在网络中的时间延迟。 所提出的系统和方法通过包括动态变化阈值形式的改进来执行时钟恢复。 根据基于可调阈值的最小网络延迟估计来执行时钟信号的重建，即，当噪声阈值降低时，当噪声阈值增加时减小的等待时间变化阈值增加。 这允许根据动态变化的网络条件检测等待时间变化并避免错误的等待时间变化检测。

公开(公告)号：US07027406B1

公开(公告)日：2006-04-11

申请号：US09535987

申请日：2000-03-27

申请人： Lior Shabtay ,  Moshe Island ,  Nachman Cohen ,  Guy Kronenthal ,  Michael Saltzman ,  Gidi Navon ,  Ron Bin

发明人： Lior Shabtay ,  Moshe Island ,  Nachman Cohen ,  Guy Kronenthal ,  Michael Saltzman ,  Gidi Navon ,  Ron Bin

IPC分类号： H04L12/26

CPC分类号： H04L12/4625

摘要： A method of managing connectivity between an end-device and one of a plurality of bridging-devices connected to the end-device. The method includes transmitting test messages by each of the bridging-devices, transmitting test messages by the end-device, determining, in each of the bridging-devices, with which of the other devices there is an operative connection, based on the test messages the bridging-device receives and determining, in each of the bridging-devices, whether a port leading to the end-device should be in a forwarding or blocking state responsive to the determination of the operative connections.

摘要翻译： 管理终端设备与连接到终端设备的多个桥接设备中的一个之间的连接性的方法。 该方法包括通过每个桥接设备发送测试消息，由终端设备发送测试消息，基于测试消息在每个桥接设备中确定与其中哪个设备有操作连接 桥接设备在每个桥接设备中接收并确定响应于确定操作连接的通向终端设备的端口是否应当处于转发或阻塞状态。

公开(公告)号：US20110044357A1

公开(公告)日：2011-02-24

申请号：US12705660

申请日：2010-02-15

申请人： Alon SHTERN ,  Alex Tal ,  Guy Kronenthal ,  Raz Korn ,  Ziv Barak ,  Osnat Shasha

发明人： Alon SHTERN ,  Alex Tal ,  Guy Kronenthal ,  Raz Korn ,  Ziv Barak ,  Osnat Shasha

IPC分类号： H04J3/06

CPC分类号： H04L12/66 ,  H04J3/0664 ,  H04L65/80 ,  H04L69/28

摘要： An improved system and method for achieving high precision clock recovery, i.e. reconstruction of the clock signal having the same frequency, over a packet switched network. The proposed method utilizes a minimum network delay approach, which overcomes the problems caused by delay variation of the network and filters out network jitter, such as noise jitter and other “singular” anomalies causing latency deviations. Minimum network delay is defined herein as the time delay in which a packet remains in the network under assumption that all transmission queues through which the packet passes are empty. The proposed system and method perform clock recovery by including an improvement in the form of dynamically varying thresholds. Reconstruction of the clock signal is performed in accordance with the minimum network delay estimation based on an adjustable threshold, i.e., the latency change threshold, which increases when the noise threshold increases and decreases when the noise threshold decreases. This allows detection of latency changes in accordance with the dynamically varying network conditions and avoids false latency change detections.

摘要翻译： 一种用于实现高精度时钟恢复的改进的系统和方法，即通过分组交换网络重建具有相同频率的时钟信号。 所提出的方法采用最小网络延迟方法，克服了由网络延迟变化引起的问题，并滤除了网络抖动，如噪声抖动和其他引起延迟偏差的“奇异”异常。 在这里将最小网络延迟定义为假设分组通过的所有传输队列为空的分组保留在网络中的时间延迟。 所提出的系统和方法通过包括动态变化阈值形式的改进来执行时钟恢复。 根据基于可调阈值的最小网络延迟估计来执行时钟信号的重建，即，当噪声阈值降低时，当噪声阈值增加时减小的等待时间变化阈值增加。 这允许根据动态变化的网络条件检测等待时间变化并避免错误的等待时间变化检测。

公开(公告)号：US20060050741A1

公开(公告)日：2006-03-09

申请号：US11268298

申请日：2005-11-04

申请人： Lior Shabtay ,  Moshe Island ,  Nachman Cohen ,  Guy Kronenthal ,  Michael Saltzman ,  Gidi Navon ,  Ron Bin

发明人： Lior Shabtay ,  Moshe Island ,  Nachman Cohen ,  Guy Kronenthal ,  Michael Saltzman ,  Gidi Navon ,  Ron Bin

IPC分类号： H04J1/10

CPC分类号： H04L12/4625

摘要： A method of managing connectivity between an end-device and one of a plurality of bridging-devices connected to the end-device. The method includes transmitting test messages by each of the bridging-devices, transmitting test messages by the end-device, determining, in each of the bridging-devices, with which of the other devices there is an operative connection, based on the test messages the bridging-device receives and determining, in each of the bridging-devices, whether a port leading to the end-device should be in a forwarding or blocking state responsive to the determination of the operative connections.

公开(公告)号：US06928049B2

公开(公告)日：2005-08-09

申请号：US10638826

申请日：2003-08-11

申请人： Lior Shabtay ,  Amir Gonen ,  Moshe Island ,  Guy Kronenthal ,  Evgenia Jenny Shteinberg ,  Ygdal Naouri

发明人： Lior Shabtay ,  Amir Gonen ,  Moshe Island ,  Guy Kronenthal ,  Evgenia Jenny Shteinberg ,  Ygdal Naouri

IPC分类号： H04L12/437 ,  H04L12/44 ,  H04L29/14 ,  H04L12/26

CPC分类号： H04L12/437 ,  H04L12/44 ,  H04L69/40

摘要： A method of managing connectivity of a cluster of bridging-devices including a plurality of links. The method includes pre-designating at least one of the links as a redundant link which is blocked when all the other links are operative and connected in accordance with a predetermined scheme, determining connectivity data on the connectivity of the links of the cluster, and activating or blocking the pre-designated redundant at least one link responsive to the connectivity data.

摘要翻译： 一种管理包括多个链路的桥接设备的集群的连接性的方法。 所述方法包括将所述链路中的至少一个预先指定为冗余链路，当所有其他链路根据预定方案可操作和连接时，所述冗余链路被阻塞，确定所述群集的链路的连通性的连接性数据，以及激活 或者响应于连接数据来阻塞预先指定的冗余的至少一个链路。