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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
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.
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公开(公告)号：US10396971B2
公开(公告)日：2019-08-27
申请号：US15728519
申请日：2017-10-10
Applicant: RAD DATA COMMUNICATIONS LTD.
Inventor： Gabriel Zigelboim , Alon Geva , Yaakov Stein
Abstract: A method for measuring one-way delays in a communications network, the method comprising: maintaining, at a third node having a reference clock, a first virtual clock state emulating a first node clock located at a first node and a second virtual clock state emulating a second node clock located at a second node; registering a timeset comprising transmission and reception times at the first node and the second node, respectively, for each packet of a plurality of packets that are transmitted from the first node to the second node and reflected from the second node back to the first node; converting times in the timeset, responsive to the first and/or second virtual clocks, into times in accordance with the reference clock; calculating, for each packet of the plurality of packets, a forward one-way delay (FOWD) and a reverse one-way delay (ROWD), responsive to the converted timeset.
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公开(公告)号：US20180152281A1
公开(公告)日：2018-05-31
申请号：US15728519
申请日：2017-10-10
Applicant: RAD DATA COMMUNICATIONS LTD.
Inventor： Gabriel Zigelboim , Alon Geva , Yaakov Stein
CPC classification number: H04L7/0012 , H04J3/0667 , H04J3/0682 , 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, at a third node having a reference clock, a first virtual clock state emulating a first node clock located at a first node and a second virtual clock state emulating a second node clock located at a second node; registering a timeset comprising transmission and reception times at the first node and the second node, respectively, for each packet of a plurality of packets that are transmitted from the first node to the second node and reflected from the second node back to the first node; converting times in the timeset, responsive to the first and/or second virtual clocks, into times in accordance with the reference clock; calculating, for each packet of the plurality of packets, a forward one-way delay (FOWD) and a reverse one-way delay (ROWD), responsive to the converted timeset.
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公开(公告)号：US09525502B2
公开(公告)日：2016-12-20
申请号：US14634906
申请日：2015-03-02
Applicant: RAD DATA COMMUNICATIONS LTD.
Inventor： Alon Geva , Gabriel Zigelboim , Yaakov Stein
CPC classification number: H04J3/0667 , H04J3/067 , H04J3/0682 , H04L41/06 , H04L43/106
Abstract: Apparatus for synchronizing a local clock to a master clock, 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, copies timing information from the received packets if the packets are timing distribution packets that are transmitted between a master clock and a slave clock in order to synchronize the slave clock to the master clock, and forwards the received packets for transmission from a port of the at least one port towards a packet destination that is not a packet source from where the packets originate, wherein the local clock uses the copied timing information and timestamps to synchronize the local clock to the master clock.
Abstract translation: 用于将本地时钟同步到主时钟的装置，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 以及分组检查器，其使用来自本地时钟的时间来在至少一个端口的端口处接收到分组的时间戳，如果分组是在主时钟和从时钟之间传送的定时分布分组，则从接收的分组复制定时信息 为了将从时钟同步到主时钟，并且将接收到的分组转发到从至少一个端口的端口传送到不是分组来源的分组源的分组目的地，其中本地时钟使用 复制的定时信息和时间戳将本地时钟同步到主时钟。
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