公开(公告)号：US10298346B2

公开(公告)日：2019-05-21

申请号：US15171518

申请日：2016-06-02

Applicant: Cisco Technology, Inc.

Inventor： Pascal Thubert ,  Laurent Montini

IPC: H04J3/06 ,  H04W40/02 ,  H04W56/00 ,  H04W4/70 ,  H04L29/08 ,  H04W84/18

Abstract: In one embodiment, a method comprises receiving, by a network device, one or more advertisement messages comprising timing information describing a quality of a network clock that is originated by a master clock device at a root of a directed acyclic graph (DAG); the network device executing an objective function for the DAG providing an optimized loopless time topology for the network clock, synchronized to the master clock device, based on the timing information; and the network device attaching to a parent device in the DAG based on the objective function, for optimized generation of the network clock by the network device.

公开(公告)号：US20150207579A1

公开(公告)日：2015-07-23

申请号：US14672961

申请日：2015-03-30

Applicant: Cisco Technology, Inc.

Inventor： John T. Chapman ,  Rakesh Chopra ,  Laurent Montini ,  Michael Overcash

IPC: H04J3/06

CPC classification number: H04J3/0661 ,  H04J3/0667 ,  H04J3/0682 ,  H04J3/0688 ,  H04J13/16 ,  H04L1/004 ,  H04L7/033 ,  H04L7/048 ,  H04L12/2801

Abstract: An accurate non-Data Over Cable Service Interface Specification (non-DOCSIS) clock signal is generated at the downstream output of a DOCSIS network. In one example method, a downstream DOCSIS Timing Protocol (DTP) client in the DOCSIS network is frequency synchronized to an upstream DTP server in the DOCSIS network. DOCSIS timing information, along with one or more timing correction factors received at the DTP client, is used to time synchronize the DTP client to the DTP server. Based on the time and frequency synchronization between the DTP server and the DTP client, the clock signal is generated at the output of the DTP client in accordance with the non-DOCSIS timing protocol.

Abstract translation: 在DOCSIS网络的下游输出端产生精确的非数据有线服务接口规范（非DOCSIS）时钟信号。 在一个示例性方法中，DOCSIS网络中的下游DOCSIS定时协议（DTP）客户端与DOCSIS网络中的上游DTP服务器频率同步。 DOCSIS定时信息连同在DTP客户端接收的一个或多个定时校正因子被用于将DTP客户端与DTP服务器进行时间同步。 根据DTP服务器与DTP客户端之间的时间和频率同步，根据非DOCSIS定时协议在DTP客户端的输出端生成时钟信号。

公开(公告)号：US09252902B2

公开(公告)日：2016-02-02

申请号：US14672961

申请日：2015-03-30

Applicant: Cisco Technology, Inc.

Inventor： John T. Chapman ,  Rakesh Chopra ,  Laurent Montini ,  Michael Overcash

IPC: H04J3/06 ,  H04J13/16 ,  H04L12/28 ,  H04L7/033 ,  H04L1/00 ,  H04L7/04

CPC classification number: H04J3/0661 ,  H04J3/0667 ,  H04J3/0682 ,  H04J3/0688 ,  H04J13/16 ,  H04L1/004 ,  H04L7/033 ,  H04L7/048 ,  H04L12/2801

Abstract: An accurate non-Data Over Cable Service Interface Specification (non-DOCSIS) clock signal is generated at the downstream output of a DOCSIS network. In one example method, a downstream DOCSIS Timing Protocol (DTP) client in the DOCSIS network is frequency synchronized to an upstream DTP server in the DOCSIS network. DOCSIS timing information, along with one or more timing correction factors received at the DTP client, is used to time synchronize the DTP client to the DTP server. Based on the time and frequency synchronization between the DTP server and the DTP client, the clock signal is generated at the output of the DTP client in accordance with the non-DOCSIS timing protocol.