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    • 2. 发明授权
    • Timing synchronization and switchover in a network switch
    • 网络交换机中的定时同步和切换
    • US6078595A
    • 2000-06-20
    • US920250
    • 1997-08-28
    • John Patrick JonesRaymond SchmidtEric L. ReedPatrick L. DeAngelisMahesh N. GanmukhiThomas A. HochBrian Branscomb
    • John Patrick JonesRaymond SchmidtEric L. ReedPatrick L. DeAngelisMahesh N. GanmukhiThomas A. HochBrian Branscomb
    • H04J3/06H04Q11/04
    • H04Q11/0421H04J3/0688
    • A data communications switch and method of operation are presently disclosed enabling flexible, selectable provision of a common timing signal for synchronized external communication through physical layer interfaces with other network devices, synchronized internal communications within the switch, and for uninterrupted synchronization of such communications. Synchronization of external communications is enabled by programmable selection from among plural potential timing references at redundant timing modules (TMs). An active TM provides a primary external synchronization clock; a standby TM provides a redundant timing function. Both TMs access the same references. A state signal indicates which synchronization clock is active. External interfaces derive timing from this distributed clock. Synchronized internal timing is provided by an internal clock and phase-locked loop (PLL) on each TM. The clock/PLL timing signal output is routed to other switch elements, enabling synchronized internal data transfer. Both interconnected TMs actively generate clock signals for external and internal use, enabling seamless timing switchover should conditions warrant a change in TMs.
    • 目前公开了一种数据通信开关和操作方法,使得能够灵活地,可选择地提供用于通过与其他网络设备的物理层接口同步的外部通信,交换机内的同步内部通信以及这种通信的不间断同步的公共定时信号。 通过在冗余定时模块(TM)的多个潜在定时参考中的可编程选择来实现外部通信的同步。 主动TM提供主要的外部同步时钟; 备用TM提供冗余定时功能。 两个TM都访问相同的引用。 状态信号指示哪个同步时钟是活动的。 外部接口从该分布式时钟导出时序。 同步的内部时序由每个TM上的内部时钟和锁相环(PLL)提供。 时钟/ PLL定时信号输出被路由到其他开关元件,实现同步的内部数据传输。 两个互连的TM主动地产生用于外部和内部使用的时钟信号,如果条件需要TM变化,则实现无缝时序切换。