公开(公告)号：US09762318B2

公开(公告)日：2017-09-12

申请号：US14426070

申请日：2013-07-10

Applicant: ZTE Corporation

Inventor： Jianxin Xu ,  Li He ,  Liang Xia

IPC: H04B10/071 ,  H04B10/25 ,  H04L7/00

CPC classification number: H04B10/071 ,  H04B10/25 ,  H04L7/0075

Abstract: A time synchronization apparatus and method for automatically detecting the asymmetry of an optical fiber. The apparatus comprises an OTDR asymmetry detecting module (12), a time delay compensating module (14) and a time synchronization correcting module (16), the OTDR asymmetry detecting module (12) comprises an emitting unit (122) used for emitting a detection signal to the optical fiber, a receiving unit (124) used for receiving the detection signal returned by the optical fiber, a transmission time delay determining unit (126) used for determining the transmission time delay of the detection signal in the optical fiber according to the time difference between the emitting detection signal and the returned detection signal, and the determining transmission time delay of a service signal in the optical fiber according to the transmission time delay of the detection signal; The time delay compensating module (14) is used for calculating asymmetric time delay value between the first optical fiber and the second optical fiber according to the transmission time delay of the first optical fiber and the transmission time delay of the second optical fiber; The time synchronization correcting module (16) is used for synchronization correcting time according to the asymmetry time delay. The apparatus and method can improve the time synchronism precision.

公开(公告)号：US20150229388A1

公开(公告)日：2015-08-13

申请号：US14426070

申请日：2013-07-10

Applicant: ZTE Corporation

Inventor： Jianxin Xu ,  Li He ,  Liang Xia

IPC: H04B10/071 ,  H04B10/25 ,  H04L7/00

CPC classification number: H04B10/071 ,  H04B10/25 ,  H04L7/0075

Abstract: A time synchronization apparatus and method for automatically detecting the asymmetry of an optical fiber. The apparatus comprises an OTDR asymmetry detecting module (12), a time delay compensating module (14) and a time synchronization correcting module (16), the OTDR asymmetry detecting module (12) comprises an emitting unit (122) used for emitting a detection signal to the optical fiber, a receiving unit (124) used for receiving the detection signal returned by the optical fiber, a transmission time delay determining unit (126) used for determining the transmission time delay of the detection signal in the optical fiber according to the time difference between the emitting detection signal and the returned detection signal, and the determining transmission time delay of a service signal in the optical fiber according to the transmission time delay of the detection signal; The time delay compensating module (14) is used for calculating asymmetric time delay value between the first optical fiber and the second optical fiber according to the transmission time delay of the first optical fiber and the transmission time delay of the second optical fiber; The time synchronization correcting module (16) is used for synchronization correcting time according to the asymmetry time delay. The apparatus and method can improve the time synchronism precision.

Abstract translation: 一种用于自动检测光纤的不对称性的时间同步装置和方法。 该装置包括OTDR不对称检测模块（12），时间延迟补偿模块（14）和时间同步校正模块（16），所述OTDR不对称检测模块（12）包括用于发射检测的发射单元（122） 信号到光纤，用于接收由光纤返回的检测信号的接收单元（124），用于确定根据光纤的光纤中的检测信号的传输时间延迟的传输时间延迟确定单元（126） 发射检测信号和返回的检测信号之间的时间差，以及根据检测信号的传输时间延迟确定光纤中的服务信号的传输时间延迟; 延时补偿模块（14）用于根据第一光纤的传输时间延迟和第二光纤的传输时间延迟来计算第一光纤与第二光纤之间的非对称时间延迟值; 根据不对称时间延迟，时间同步校正模块（16）用于同步校正时间。 该装置和方法可以提高时间同步精度。

公开(公告)号：US20150215108A1

公开(公告)日：2015-07-30

申请号：US14356205

申请日：2012-04-18

Applicant: Jianxin XU ,  Li HE ,  ZTE CORPORATION

Inventor： Jianxin Xu ,  Li He

IPC: H04L7/00

CPC classification number: H04L7/0016 ,  H04J3/0667 ,  H04J3/14 ,  H04L41/064 ,  H04L43/106

Abstract: A method and a device for detecting a 1588 time error between network elements are disclosed. The method includes: a 1588 time network is established for an entire network; when it is required to detect a 1588 time error between a network element and its opposite network element, the network elements transmit, probe packets, each including a local timestamp to each other; and the network element receiving a probe packet calculates, according to a preset time difference algorithm, a time difference between the local timestamp and the timestamp in the probe packet, determines, according to the time difference, whether there is a failure in a detection path, and reports an alarm when there is a failure in the detection path. The disclosure prevents erroneous time transmission due to the time error, thus ensuring the network stability.

Abstract translation: 公开了一种用于检测网络元件之间的1588时间误差的方法和装置。 该方法包括：为整个网络建立1588时间网络; 当需要检测网元与其相对网元之间的1588时间误差时，网元将每个包含本地时间戳的探测包发送给彼此; 并且接收探测分组的网络单元根据预设的时差算法，计算探测分组中的本地时间戳与时间戳之间的时间差，根据时差确定检测路径中是否存在故障 ，并在检测路径出现故障时报告。 本公开防止由于时间错误而导致错误的时间传输，从而确保网络的稳定性。