Time synchronization method and device in passive optical network and passive optical network
US8335437B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 30, 2009 |
| Grant date | Dec 18, 2012 |
| Priority date | — |
| Expiry date | Oct 7, 2030 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04Q2011/0088
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A time synchronization method and a time synchronization device in a passive optical network (PON), and a PON are provided. The method includes receiving a synchronization packet sent after time synchronization of an optical line terminal (OLT) with a master clock (MC) is achieved, wherein the synchronization packet carries a timestamp TMt1i determined after the time synchronization of the OLT is achieved, adjusting a local clock according to the timestamp to achieve time synchronization of an optical network unit/optical network terminal (ONU/ONT) with the OLT, and after the time synchronization of the OLT is achieved, instructing an slave clock (SC) to perform time synchronization. A time synchronization device and a time synchronization system for implementing the method in a PON are further provided.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.