The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 12, 2025
Filed:
Nov. 22, 2022
China Telecom Corporation Limited, Beijing, CN;
Qizheng Li, Beijing, CN;
Dezhi Zhang, Beijing, CN;
CHINA TELECOM CORPORATION LIMITED, Beijing, CN;
Abstract
A downlink signal synchronization method and system are described. The method is applied to a wavelength division multiplexing passive optical network, including: when an optical network unit (GNU) is in a running state, detecting whether the synchronization of downlink signals is lost, the downlink signals comprising a management channel signal and a data channel signal; when the synchronization of the management channel signal is lost and the data channel signal is normally synchronized, switching the ONU from the running state to a management channel synchronization loss sub-state; monitoring a first recovery time of the ONU for recovering management channel signal synchronization in the management channel synchronization loss sub-state; and if the first recovery time does not exceed a first preset time threshold and the data channel signal is still normally synchronized, returning the ONU from the management channel synchronization loss sub-state to the running state.