公开(公告)号：US20200220636A1

公开(公告)日：2020-07-09

申请号：US16595322

申请日：2019-10-07

Applicant: ADVA Optical Networking SE

Inventor： Michael RABINOVICH ,  Moshe TOFEF ,  Igal PINCHASOV

IPC: H04J3/06 ,  H04L7/00 ,  G06F1/14 ,  H04L12/26 ,  G06F9/54 ,  H04L29/06

Abstract: There is provided a technique of time delivery in a computing system comprising a system call interface (SCI) located in a kernel space and operatively connected to a time client located in a user space. The technique comprises: using a time agent component located in the user space to measure data indicative of delay in a system time delivery and to derive therefrom a system time delivery error TES2C; using TES2C to enable correction of system time; and sending by the SCI the corrected system time in response to a “Read Clock RT” (RCRT) call received from the time client. The method can further comprise: measuring data indicative of delays in the system time delivery for RCRT calls with different priorities; and in response to a system time request received from the time client, providing the time client with system time corrected per TES2C corresponding to the recognized priority thereof.

公开(公告)号：US20230171015A1

公开(公告)日：2023-06-01

申请号：US17991356

申请日：2022-11-21

Applicant: ADVA Optical Networking SE

Inventor： Michael RABINOVICH ,  Andrew SERGEEV ,  Joo Yeon CHO ,  Shihuan ZOU

IPC: H04J3/06

CPC classification number: H04J3/0667 ,  H04J3/0644

Abstract: There is provided a technique of securing clock synchronization between master clock node (MCN) and client clock node (CCN). During a cycle of exchanging PTP messages between MCN and CCN, MCN generates an associated paired message for each PTP message generated thereby and informative of t1 or t4 timestamps provided by MCN and sends each paired message to a validation entity (VE) via a secured channel between MCN and VE. When PTP messages traverse transparent clock nodes (TCN) between MCN and CCN, each TCN generates a paired message for each version of PTP message updated thereby and sends each generated paired message to VE via a secured channel between respective TCN and VE. VE uses the received paired messages to provide a validation of the cycle, wherein synchronization-related task(s) (e.g. clock correction by the client clock node, etc.) are provided only subject to successful validation of the cycle by VE.

公开(公告)号：US20230076889A1

公开(公告)日：2023-03-09

申请号：US17941637

申请日：2022-09-09

Applicant: ADVA Optical Networking SE

Inventor： Michael RABINOVICH ,  Moshe TOFEF

IPC: H04J3/06

Abstract: There is provided a method of clock recovery and a system thereof. The method comprises: by master clock node or by client clock node, generating a first flow of time-stamped packets bearing indication of high priority of delivery and, in parallel, generating a second flow of time-stamped packets bearing indication of lower priority of delivery. By client clock node, processing the packets from the first flow separately from the packets from the second flow to define, separately for each flow, a function informative of changes of packets' delays in the respective flow over time; using the defined functions informative of changes of packets' delays in the first and the second flows over the same time intervals to assess a cause of the packets' delays changes; and applying a clock recovery algorithm in a manner differentiated in accordance with the assessed cause.

公开(公告)号：US20210294378A1

公开(公告)日：2021-09-23

申请号：US17107090

申请日：2020-11-30

Applicant: ADVA Optical Networking SE

Inventor： Michael RABINOVICH ,  Moshe Tofef

IPC: G06F1/12 ,  H04J3/06 ,  G06F21/62 ,  G06F21/60 ,  H04L9/08

Abstract: There is provided a technique of clock managing in a packet data network implementing a time-transfer protocol. The technique comprises: modifying, by the timing-server, a timestamp record to enable a controllable access to data informative of the least significant part of clock-informative data (CLSP data), wherein modifying the timestamp record comprises modifying the least significant part of the timestamp record (RLSP) to comprise the CLSP data in an encrypted form or to comprise values substituting, in a predefined manner, the CLSP data; transferring the modified timestamp record to all timing-clients, wherein CLSP data are transferred in a controllable access manner; enabling access to the CLSP data merely to authorized timing-clients among the plurality of timing-clients; and enabling the authorized timing-clients to obtain the CLSP data and synchronize the respective clocks using the CLSP data together with data informative of the most significant part of the clock-informative data.