System and method for synchronizing telecom-related clocks in ethernet-based passive optical access network
    1.
    发明授权
    System and method for synchronizing telecom-related clocks in ethernet-based passive optical access network 有权
    在以太网无源光接入网络中同步电信相关时钟的系统和方法

    公开(公告)号:US06470032B2

    公开(公告)日:2002-10-22

    申请号:US09813774

    申请日:2001-03-20

    IPC分类号: H04B1000

    摘要: A system and method for synchronizing clocks related to telecommunications throughout s point-to-multipoint optical network utilizes downstream data timed using a high frequency transmission clock to distribute timing information of a central telecom-based clock to remote terminals. In an exemplary embodiment, the point-to-multipoint optical network system is an Ethernet-based passive optical network (PON) system that operates in accordance with a Gigabit Ethernet standard. The timing information of the central telecom-based clock is extracted from the downstream data at each remote terminal by recovering the high frequency transmission clock and then, deriving a reference clock, which is synchronized with the central telecom-based clock, from the recovered transmission clock. The reference clock is then used to generate one or more telecom-related clocks that are needed by the remote terminal. The system and method allows telecom-related clocks throughout the system to be synchronized in an efficient and cost-effective manner.

    摘要翻译: 通过s点对多点光网络同步与电信相关的时钟的系统和方法利用使用高频传输时钟定时的下行数据,以将基于中心电信的时钟的定时信息分发给远程终端。 在示例性实施例中,点对多点光网络系统是基于千兆以太网标准操作的基于以太网的无源光网络(PON)系统。 通过恢复高频传输时钟,从每个远程终端的下游数据提取中央电信时钟的定时信息,然后从恢复的传输中导出与基于中央电信的时钟同步的参考时钟 时钟。 然后,参考时钟用于产生远程终端所需的一个或多个与电信相关的时钟。 该系统和方法允许整个系统中的与电信相关的时钟以高效和成本有效的方式同步。

    Point-to-multipoint passive optical network that utilizes variable-length packets
    2.
    发明授权
    Point-to-multipoint passive optical network that utilizes variable-length packets 有权
    使用可变长度分组的点对多点无源光网络

    公开(公告)号:US07031343B1

    公开(公告)日:2006-04-18

    申请号:US09715275

    申请日:2000-11-17

    IPC分类号: H04J3/24

    摘要: A point-to-multipoint passive optical network transmits downstream data from an optical line terminal (OLT) to multiple optical network units (ONUs) in variable-length packets and upstream data from the ONUs to the OLT in variable-length packets utilizing time division multiplexing to avoid transmission collisions. In an embodiment, the variable-length downstream packets and the variable-length upstream packets are formatted according to IEEE 802.3. In an embodiment, the length of the variable-length downstream and upstream packets is related to the length of Internet protocol (IP) datagrams carried within the packets.

    摘要翻译: 点对多点无源光网络将可变长度分组中的光线路终端(OLT)的下行数据从ONU发送到OLT的可变长度分组中的多个光网络单元(ONU),并利用时分 多路复用以避免传输冲突。 在一个实施例中,可变长度下行分组和可变长度上行分组根据IEEE 802.3格式化。 在一个实施例中,可变长度的下行和上行分组的长度与分组内承载的因特网协议(IP)数据报的长度相关。

    System and method for synchronizing telecom-related clocks across an unsynchronized point-to-point network connection
    3.
    发明授权
    System and method for synchronizing telecom-related clocks across an unsynchronized point-to-point network connection 有权
    跨不同步点对点网络连接同步电信相关时钟的系统和方法

    公开(公告)号:US07555015B2

    公开(公告)日:2009-06-30

    申请号:US10273536

    申请日:2002-10-18

    IPC分类号: H04J3/06

    摘要: A system and method for synchronizing clocks related to telecommunications across an unsynchronized point-to-point network connection utilizes downstream data timed using a high frequency transmission clock to transfer timing information of a central telecom-based clock from a first network node to a second network node. In an exemplary embodiment, the point-to-point network connection is an Ethernet-based connection that operates in accordance with a Gigabit Ethernet standard. The timing information of the central telecom-based clock is extracted from the transmitted data at the second network node by recovering the high frequency transmission clock and then, deriving a reference clock, which is synchronized with the central telecom-based clock, from the recovered transmission clock. The reference clock is then used to generate one or more telecom-related clocks that are used by the second network node.

    摘要翻译: 用于同步跨越不同步点对点网络连接的与电信相关的时钟的系统和方法利用使用高频传输时钟定时的下行数据,以将基于中央电信的时钟的定时信息从第一网络节点传送到第二网络 节点。 在示例性实施例中,点到点网络连接是基于以太网的连接,其根据千兆位以太网标准进行操作。 通过恢复高频传输时钟,从第二网络节点的发送数据中提取出基于中央电信的时钟的定时信息,然后导出与基于中央电信的时钟同步的参考时钟 传输时钟。 然后,参考时钟用于生成由第二网络节点使用的一个或多个与电信相关的时钟。