公开(公告)号：US09787461B1

公开(公告)日：2017-10-10

申请号：US15361517

申请日：2016-11-28

Applicant: RAD DATA COMMUNICATIONS LTD.

Inventor： Gabriel Zigelboim ,  Alon Geva ,  Yaakov Stein

IPC: H04L7/00 ,  H04L12/26

CPC classification number: H04L7/0012 ,  H04J3/0667 ,  H04L7/0004 ,  H04L43/062 ,  H04L43/0858 ,  H04L43/0864 ,  H04L43/106

Abstract: A method for measuring one-way delays in a communications network, the method comprising: maintaining a virtual clock state comprising information for converting times measured with respect to remote clocks into times as would be measured with respect to a local reference clock; registering, for each packet of the plurality of packets in a communications session between the first and second nodes, a timeset comprising transmission and reception times at the first and second nodes; converting, responsive to the virtual clock, times in the timeset measured with respect to the first node clock or the second node clock, into times as would be measured with respect to the reference clock; calculating, for each packet of the series of packets, a forward one-way delay (FOWD) from the first node to the second node and a reverse one-way delay (ROWD) from the second node to the first node, responsive to the converted timeset.

公开(公告)号：US08660150B2

公开(公告)日：2014-02-25

申请号：US13297723

申请日：2011-11-16

Applicant: Alon Geva ,  Ehud Malik ,  Yaakov Stein

Inventor： Alon Geva ,  Ehud Malik ,  Yaakov Stein

IPC: H04J3/06

CPC classification number: H04L12/2879 ,  H04J3/0667 ,  H04J3/0673

Abstract: A method and system in which a Digital Subscriber Line Access Multiplexer (DSLAM) that is part of a DSL (Digital Subscriber Line) system is able to provide synchronous services to end user equipment connected to the DSLAM via a DSL link and Customer Premises Equipment (CPE). A sniffer device having direct or indirect access to a Primary Reference Clock (PRC) of the DSL system calculates the phase difference between the PRC and the DSLAM's Local Timing Reference (LTR). The phase difference is sent to the CPEs requiring accurate reference clock frequency. The CPEs are able to derive the PRC from the phase difference information transmitted by the sniffer device thus enabling synchronous end user equipment operation.

Abstract translation: 作为DSL（数字用户线路）系统的一部分的数字用户线路接入复用器（DSLAM）能够通过DSL链路和客户端设备（例如，向DSLAM提供连接到DSLAM的终端用户设备）提供同步服务的方法和系统 CPE）。 具有对DSL系统的主参考时钟（PRC）的直接或间接访问的嗅探装置计算PRC和DSLAM的本地定时参考（LTR）之间的相位差。 相位差发送到需要精确参考时钟频率的CPE。 CPE能够根据由嗅探装置发送的相位差信息导出PRC，从而实现同步最终用户设备的操作。

公开(公告)号：US20120275317A1

公开(公告)日：2012-11-01

申请号：US13097112

申请日：2011-04-29

Applicant: Alon Geva ,  Gabriel Zigelboim ,  Yaakov Stein

Inventor： Alon Geva ,  Gabriel Zigelboim ,  Yaakov Stein

IPC: H04L12/26

CPC classification number: H04J3/0667 ,  H04J3/067 ,  H04J3/0682 ,  H04L41/06 ,  H04L43/106

Abstract: Apparatus for monitoring a packet switched network, the apparatus comprising: at least one port for receiving and transmitting packets; a local clock; and a packet inspector that uses time from the local clock to timestamp packets received at a port of the at least one port, and additionally copies timing information from received timing distribution packets, which are transmitted from a master clock to a slave clock in order to discipline the slave clock, and forwards the received packets for transmission from a port of the at least one port; wherein the apparatus uses the timestamp of a received timing distribution packet and the copied timing information to monitor timing distribution performance of the network .

Abstract translation: 用于监视分组交换网络的装置，所述装置包括：用于接收和发送分组的至少一个端口; 当地时钟 以及数据包检查器，其使用来自本地时钟的时间来对在所述至少一个端口的端口处接收到的分组进行时间戳记，并且另外从接收到的定时分布分组复制定时信息，定时信息从主时钟发送到从时钟，以便 纪律从时钟，并且从所述至少一个端口的端口转发所接收的用于传输的分组; 其中所述装置使用所接收的定时分布分组的时间戳和所述复制的定时信息来监视所述网络的定时分布性能。