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    • 3. 发明申请
    • OPTICAL NETWORK TERMINAL, METHOD FOR TIME SYNCRONIZATION THEREOF, OPTICAL LINE TERMINAL, AND METHOD FOR MANAGING NETWORK THEREOF
    • 光网络终端,其时间同步方法,光线终端及其网络管理方法
    • US20110129218A1
    • 2011-06-02
    • US12902273
    • 2010-10-12
    • Sung Chang Kim
    • Sung Chang Kim
    • H04J14/00
    • H04J3/0682H04J3/1694
    • 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.
    • 提供了一种通过无源光网络系统中的光网络终端(ONT)来同步时间的方法。 该方法包括:接收包括光线路终端(OLT)的第一当前时间的测距请求消息; 当接收到所述测距请求消息时,计算发送延迟被补偿的第一补偿时间; 向OLT发送序列号响应消息; 当在发送序列号响应消息的时间补偿传输延迟时,计算第二补偿时间; 当接收到来自OLT的序列号响应消息时,接收包括第二当前时间的测距时间消息; 从第一当前时间,第二当前时间,第一补偿时间和第二补偿时间计算偏移时间; 以及基于所述偏移时间来同步所述ONT的时钟和所述OLT的时钟。
    • 9. 发明授权
    • Optical network terminal, method for time syncronization thereof, optical line terminal, and method for managing network thereof
    • 光网络终端,其时间同步化方法,光线路终端及其网络管理方法
    • US08542995B2
    • 2013-09-24
    • US12902273
    • 2010-10-12
    • Sung Chang Kim
    • Sung Chang Kim
    • H04J14/00H04B10/12
    • H04J3/0682H04J3/1694
    • 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.
    • 提供了一种通过无源光网络系统中的光网络终端(ONT)来同步时间的方法。 该方法包括:接收包括光线路终端(OLT)的第一当前时间的测距请求消息; 当接收到所述测距请求消息时,计算发送延迟被补偿的第一补偿时间; 向OLT发送序列号响应消息; 当在发送序列号响应消息的时间补偿传输延迟时,计算第二补偿时间; 当接收到来自OLT的序列号响应消息时,接收包括第二当前时间的测距时间消息; 从第一当前时间,第二当前时间,第一补偿时间和第二补偿时间计算偏移时间; 以及基于所述偏移时间来同步所述ONT的时钟和所述OLT的时钟。