公开(公告)号：US06868232B2

公开(公告)日：2005-03-15

申请号：US09781864

申请日：2001-02-12

申请人： Peter Van Eijk ,  Reed K. Even ,  Piet Van Hevingen ,  Song Jiang ,  Kyeong-Soo Kim ,  Woojune Kim ,  Fengkun Liu ,  Yong-Kwan Park

发明人： Peter Van Eijk ,  Reed K. Even ,  Piet Van Hevingen ,  Song Jiang ,  Kyeong-Soo Kim ,  Woojune Kim ,  Fengkun Liu ,  Yong-Kwan Park

IPC分类号： H04B10/08 ,  H04B1/74 ,  H04B10/00 ,  H04J3/00 ,  H04L12/44 ,  H04Q11/00

CPC分类号： H04J14/0291 ,  H04B10/032 ,  H04J3/0682 ,  H04J14/0282 ,  H04Q11/0066 ,  H04Q11/0067 ,  H04Q2011/0079 ,  H04Q2011/0081 ,  H04Q2011/0083

摘要： An optical network has an optical splitter connected to (1) a working optical subscriber unit (OSU) of a working circuit via a working optical fiber, (2) a protection OSU of a protection circuit via a protection optical fiber, and (3) one or more optical network terminals (ONTs). The present invention enables fast protection switching from the working OSU to the protection OSU. In one embodiment, the arrival times of corresponding upstream ranging reply PLOAM cells are measured at both the working and protection OSUs during ranging operations of the working OSU. In another embodiment, a cell delineation procedure is initiated at the protection OSU during normal, non-ranging operations of the working OSU to enable the protection OSU to correctly delineate upstream cells and the arrival times of corresponding upstream cells are then measured at both the working and protection OSUs. In either case, a propagation delay value is generated based on the measured arrival times for use by the protection OSU for communications with the one or more ONTs if and when protection switching is implemented upon detection of a failure in the working circuit, possibly without requiring the protection OSU to perform any ranging for the one or more ONTs.

摘要翻译： 光网络具有通过工作光纤连接到（1）工作电路的工作光用户单元（OSU）的光分路器，（2）经由保护光纤的保护电路的保护OSU，以及（3） 一个或多个光网络终端（ONT）。 本发明能够从工作OSU到保护OSU的快速保护切换。 在一个实施例中，相应的上游测距答复PLOAM小区的到达时间在工作OSU的测距操作期间在工作和保护OSU两者处测量。 在另一个实施例中，在正常的非工作OSU的非测距操作期间，在保护OSU处启动小区描述过程，以使得保护OSU能够正确地描绘上游小区，然后在工作OSU上测量相应的上行小区的到达时间 和保护OSU。 在任一情况下，如果在检测到工作电路中的故障时实施保护切换，则可以基于所保护的OSU用于与一个或多个ONT通信的测量到达时间来生成传播延迟值，可能不需要 保护OSU为一个或多个ONT执行任何测距。