公开(公告)号：US06771908B2

公开(公告)日：2004-08-03

申请号：US09781863

申请日：2001-02-12

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

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

IPC分类号： H04B1008

CPC分类号： H04J14/0291 ,  H04B10/032 ,  H04B10/272 ,  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, (2) a protection OSU of a protection circuit, and (3) one or more optical network terminals (ONTs), where an ONT has (i) a working line termination (LT) unit of the working circuit and connected to the optical splitter via a working optical fiber and (ii) a protection LT unit of the protection circuit and connected to the optical splitter via a protection optical fiber. The present invention enables fast protection switching from the working circuit to the protection circuit. The arrival times of corresponding downstream cells are measured at both the working and protection LT units of the ONT, and information related to the arrival times is transmitted from the ONT to the protection OSU. A propagation delay value is generated based on the transmitted information for use by the protection OSU for communications with the ONT if and when protection switching is implemented upon detection of a failure in the working circuit.

摘要翻译： 光网络具有连接到（1）工作电路的工作光用户单元（OSU）的光分路器，（2）保护电路的保护OSU，以及（3）一个或多个光网络终端（ONT） 其中ONT具有（i）工作电路的工作线路终端（LT）单元，并且经由工作光纤连接到分光器，以及（ii）保护电路的保护LT单元，并经由 保护光纤。 本发明能够从工作电路到保护电路的快速保护切换。 在ONT的工作和保护LT单元上测量相应下游单元的到达时间，并且与ONT相关的信息从ONT发送到保护OSU。 如果在检测到工作电路中的故障时实现保护切换，则基于被保护OSU用于与ONT通信的传输信息生成传播延迟值。

公开(公告)号：US06778781B2

公开(公告)日：2004-08-17

申请号：US09781862

申请日：2001-02-12

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

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

IPC分类号： H04B1008

CPC分类号： H04B10/272 ,  H04B10/077 ,  H04B10/07955 ,  H04B10/27 ,  H04J3/0682

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), where the protection OSU has a protection burst mode receiver (BMR) configured to receive an upstream optical signal from the optical splitter. The algorithm determines whether the protection OSU is functioning improperly. A reset pulse is applied at the protection BMR at a particular timing position and an attempt is made to interpret the current upstream cell received at the protection BMR. This process is repeated using different timing positions for the BMR reset pulse until the current upstream cell is correctly interpreted, e.g., based on the correct identification of an ATM header error correction (HEC) byte in the upstream cell. If, after a specified number of cycles, no upstream cells are correctly interpreted, then the protection circuit is determined to have failed. In one embodiment, the algorithm is based on a cell delineation procedure implemented as a state machine.

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），其中保护OSU具有被配置为从光分路器接收上行光信号的保护突发模式接收器（BMR）。 该算法确定保护OSU是否正常工作。 在特定定时位置处的保护BMR处施加复位脉冲，并尝试解释在保护BMR处接收到的当前上行单元。 使用不同的BMR复位脉冲的定时位置重复该过程，直到例如基于上游单元中的ATM标题纠错（HEC）字节的正确识别来正确解释当前上行单元。 如果在指定数量的周期之后没有正确解释上游单元，则确定保护电路发生故障。 在一个实施例中，该算法基于实现为状态机的小区描绘过程。