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Registered OPTICAL NETWORK TERMINAL, METHOD FOR TIME SYNCRONIZATION THEREOF, OPTICAL LINE TERMINAL, AND METHOD FOR MANAGING NETWORK THEREOF
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OPTICAL NETWORK TERMINAL, METHOD FOR TIME SYNCRONIZATION THEREOF, OPTICAL LINE TERMINAL, AND METHOD FOR MANAGING NETWORK THEREOF
- Inventors
- Kim Sung Chang, Yoo Hark, Kim Geun Yong, Lee Youngsuk, Lee Dongsoo, Kim Jong Deog, Koh Jaisang, Lee Mun Seob
- Application No.
- 12902273 (2010.10.12)
- Publication No.
- 20110129218 (2011.06.02)
- Registration No.
- 8542995 (2013.09.24)
- Country
- UNITED STATES
- Project Code
- 09ZH1100, Experimental Project for FTTH and Optical Communication Convergence Technology Development, Koh Jaisang
- Abstract
- A method for synchronizing time by an optical network terminal (ONT) in a passive optical network system is provided. The method includes: receiving a ranging request message including a first current time of an optical line terminal (OLT); calculating a first compensation time when a transmission delay is compensated at a time that the ranging request message is received; transmitting a serial number response message to the OLT; calculating a second compensation time when the transmission delay is compensated at a time when the serial number response message is transmitted; receiving a ranging time message including a second current time when the serial number response message from the OLT is received; calculating an offset time from the first current time, the second current time, the first compensation time, and the second compensation time; and synchronizing a clock of the ONT and a clock of the OLT based on the offset time.
- KSP Keywords
- Network system, Offset time, Optical Network Terminal(ONT), Optical line terminal(OLT), Optical network, Passive optical network, Serial number, transmission delay