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A method for selecting a clock source

A clock and clock source technology, applied in the field of communication, can solve problems such as clock accuracy degradation, link degradation, and impact on clock accuracy, and achieve the effect of optimizing the selection method and reducing the impact

Active Publication Date: 2017-06-16
ZTE CORP
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Problems solved by technology

However, due to the instability of the network, the clock link in the PTP domain will have problems such as link failure and link degradation. Replace a new suitable clock source in real time, so it is necessary to propose a solution to avoid the decline of clock accuracy

Method used

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  • A method for selecting a clock source
  • A method for selecting a clock source
  • A method for selecting a clock source

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Embodiment Construction

[0032] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention clearer and clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0033] There are two types of link alarms: 1) Alarms affecting long-term clock accuracy, mainly including link failure and link degradation; 2) Alarms affecting transient clock accuracy, mainly including forward link defects and forward link switching . In the present invention, for the link failure alarm, the method of directly re-selecting the line is used to reselect the main clock source; for the link degradation alarm, the method of reducing the clock quality is used to affect the state selection of the BMC, so as to achieve the reselection of the ...

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Abstract

The invention discloses a method for selecting a clock source, which is applied to a precise clock synchronization protocol network. The precise clock synchronization protocol network includes a main clock source and an alternative clock source. The method includes: detecting each clock link in real time, When an alarm is generated, select a new main clock source according to the alarm type. The present invention performs master clock source reselection processing for alarms that affect long-term clock accuracy, directly reselects the master clock source for link failure alarms, and adopts a method of affecting BMC selection by reducing clock quality for link degradation alarms. Selecting the main clock source optimizes the selection method of the existing clock source and effectively reduces the impact of link failure / link degradation on clock accuracy.

Description

technical field [0001] The invention relates to the field of communication, in particular to a method for realizing the selection of a clock source. Background technique [0002] PTP (Precision Time Protocol, Precision Time Protocol) is a time synchronization protocol, which is only used for high-precision time synchronization between devices, but can also be used for frequency synchronization between devices. Compared with various existing time synchronization mechanisms, PTP has the advantages of being able to meet higher-precision time synchronization requirements and having lower construction and maintenance costs. [0003] Generally, a network to which the PTP protocol is applied is called a PTP domain, and there is only one synchronous clock in the PTP domain, and all devices in the domain are synchronized with this clock. [0004] The port running the PTP protocol on the device is called the PTP port. The roles of the PTP port can be divided into the following three ...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L7/00
CPCH04J3/0641H04J3/0667
Inventor 蔡磊宋玲玲赵洪广
Owner ZTE CORP
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