Title:
METHOD AND APPARATUS FOR SWITCHING CLOCK SOURCES
Document Type and Number:
WIPO Patent Application WO/2020/220177
Kind Code:
A1
Abstract:
A method for switching clock sources is provided. In the method, Precision Time Protocol, PTP, packets are monitored using each of PTP ports which connect to a new grandmaster (401). A frequency and a phase for the PTP port are calculated based on the PTP packets (402). In response to a successful check for the frequency and the phase, the PTP port is added to a candidate list (403). A phase calibration and a phase stability check may be introduced prior to the alternate BMCA.
Inventors:
PENG YAO (CN)
WANG JUN (CN)
LIU DAIYING (CN)
WANG JUN (CN)
LIU DAIYING (CN)
Application Number:
PCT/CN2019/084888
Publication Date:
November 05, 2020
Filing Date:
April 29, 2019
Export Citation:
Assignee:
ERICSSON TELEFON AB L M (SE)
PENG YAO (CN)
PENG YAO (CN)
International Classes:
H04J3/06
Foreign References:
| US20160156427A1 | 2016-06-02 | |||
| US20140281037A1 | 2014-09-18 | |||
| US20130227172A1 | 2013-08-29 | |||
| US20140185632A1 | 2014-07-03 | |||
| EP2802097A1 | 2014-11-12 | |||
| EP2688240A1 | 2014-01-22 |
Other References:
"Precision time protocol telecom profile for phase/time synchronization with partial timing support from the network Amendment 2; ITU-T G.8275.2/Y.1369.2 Amendment 2 (03/2018", ITU-T STANDARD G.8275.2, pages 1 - 21
Attorney, Agent or Firm:
CHINA PATENT AGENT (H.K.) LTD. (CN)
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