ATM switching system and method with propagation delay compensation
    1.
    发明授权
    ATM switching system and method with propagation delay compensation 失效
    ATM交换系统和传播延迟补偿方法

    公开(公告)号:US06301269B1

    公开(公告)日:2001-10-09

    申请号:US09081746

    申请日:1998-05-20

    IPC分类号: H04J306

    摘要: A switch system (20) switches at least sixty-four asynchronous transfer mode (ATM) input data streams (22) into at least sixty-four ATM output data streams (24). The switch system (20) includes a backplane assembly (38) having integral data transmission lines, integral clock transmission lines, and discrete slots (36). A single stage space switch circuit card (26), a clock circuit card (28), and input circuit cards (30) are connected to separate slots (36) in the backplane assembly (38). The integral data transmission lines are coupled between the input circuit cards (30) and the switch circuit card (26) and the integral clock transmission lines are coupled between the clock circuit card (28) and the input circuit cards (30). Data path lengths for the integral data transmission lines differ in the backplane assembly (38), and clock path lengths for the clock transmission lines differ in the backplane assembly. A timing compensation element (86) on each of the input circuit cards (30) imparts a time delay to one of the ATM input data streams (22) to compensate for data and clock path length differences so the each of the ATM input data streams (22) arrive at the single stage switch (26) substantially synchronously.

    摘要翻译: 交换机系统(20)将至少64个异步传输模式(ATM)输入数据流(22)切换成至少64个ATM输出数据流(24)。 开关系统(20)包括具有整体数据传输线,集成时钟传输线和分立时隙(36)的背板组件(38)。 单级空间开关电路卡(26),时钟电路卡(28)和输入电路卡(30)连接到背板组件(38)中的分开的槽(36)。 整体数据传输线耦合在输入电路卡(30)和开关电路卡(26)之间,整体时钟传输线耦合在时钟电路卡(28)和输入电路卡(30)之间。 集成数据传输线的数据路径长度在背板组件(38)中不同,时钟传输线的时钟路径长度在背板组件中不同。 每个输入电路卡(30)上的定时补偿元件(86)向一个ATM输入数据流(22)施加时间延迟,以补偿数据和时钟路径长度差异,因此每个ATM输入数据流 (22)基本同步到达单级开关(26)。