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    • 4. 发明申请
    • METHODS AND ARRANGEMENTS IN OPTICAL NETWORK
    • 光网络中的方法和布置
    • WO2011120185A1
    • 2011-10-06
    • PCT/CN2010/000389
    • 2010-03-29
    • TELEFONAKTEBOLAGET L M ERICSSON (PUBL)CHEN, LingDONG, Shuyou
    • CHEN, LingDONG, Shuyou
    • H04L7/00H04B10/00
    • H04Q11/0067G06F1/14H04J3/0655H04Q2011/0079
    • Methods and arrangements for time distribution in an optical network system in the upstream direction are disclosed. The information of a selected time reference frame and a calculated time stamp value of the frame based on a real-time clock of the optical line terminal (OLT) is sent from the OLT to the optical network unit (ONU) via the optical distribution network (ODN). When the time reference frame is sent to the ONU from the OLT via the ODN, the ONU records the arrival time of the frame based on a time reference made by the real-time clock of the ONU. The time difference between the arrival time and the time stamp value is calculated whereupon the OLT is informed of the calculated time difference. The OLT adjusts the real-time clock of the OLT in accordance with the time difference.
    • 公开了在光网络系统中在上游方向上的时间分布的方法和布置。 基于光线路终端(OLT)的实时时钟的所选择的时间参考帧和所计算的时间戳值的信息经由光分配网络从OLT发送到光网络单元(ONU) (ODN)。 当通过ODN将时间参考帧从OLT发送到ONU时,ONU基于由ONU的实时时钟作出的时间参考记录帧的到达时间。 计算到达时间和时间戳值之间的时间差,然后通知OLT计算出的时间差。 OLT根据时差调整OLT的实时时钟。