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    • 1. 发明授权
    • Fast protection switching by snooping on upstream signals in an optical network
    • 通过窥探光网络上的上行信号进行快速保护切换
    • US06868232B2
    • 2005-03-15
    • US09781864
    • 2001-02-12
    • Peter Van EijkReed K. EvenPiet Van HevingenSong JiangKyeong-Soo KimWoojune KimFengkun LiuYong-Kwan Park
    • Peter Van EijkReed K. EvenPiet Van HevingenSong JiangKyeong-Soo KimWoojune KimFengkun LiuYong-Kwan Park
    • H04B10/08H04B1/74H04B10/00H04J3/00H04L12/44H04Q11/00
    • H04J14/0291H04B10/032H04J3/0682H04J14/0282H04Q11/0066H04Q11/0067H04Q2011/0079H04Q2011/0081H04Q2011/0083
    • 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.
    • 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。
    • 3. 发明授权
    • Health check algorithm for protection circuit in optical network
    • 光网络保护电路的健康检查算法
    • US06778781B2
    • 2004-08-17
    • US09781862
    • 2001-02-12
    • Peter Van EijkReed K. EvenPiet Van HeyningenSong JiangKyeong-Soo KimWoojune KimFengkun LiuYong-Kwan Park
    • Peter Van EijkReed K. EvenPiet Van HeyningenSong JiangKyeong-Soo KimWoojune KimFengkun LiuYong-Kwan Park
    • H04B1008
    • H04B10/272H04B10/077H04B10/07955H04B10/27H04J3/0682
    • 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.
    • 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。