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Title:
DOWNLINK SIGNAL SYNCHRONIZATION METHOD AND SYSTEM
Document Type and Number:
WIPO Patent Application WO/2023/216549
Kind Code:
A1
Abstract:
The present disclosure relates to the technical field of passive optical networks, and to a downlink signal synchronization method and system. The method is applied to a wavelength division multiplexing passive optical network, and specifically comprises: when an optical network unit (ONU) 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. Therefore, the problem of ONU disconnection due to no state transition mode under a corresponding condition existing in an original state machine can be avoided.

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Inventors:
LI QIZHENG (CN)
ZHANG DEZHI (CN)
Application Number:
PCT/CN2022/133487
Publication Date:
November 16, 2023
Filing Date:
November 22, 2022
Export Citation:
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Assignee:
CHINA TELECOM CO LTD (CN)
International Classes:
H04J14/02
Foreign References:
CN108259118A2018-07-06
CN108990083A2018-12-11
US6895189B12005-05-17
US20210320743A12021-10-14
Attorney, Agent or Firm:
CCPIT PATENT AND TRADEMARK LAW OFFICE (CN)
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