公开(公告)号：US6115825A

公开(公告)日：2000-09-05

申请号：US151299

申请日：1998-09-11

申请人： Vallier Maurice Laforge ,  Geoff A. Bruce-Payne ,  Sarto Barsetti ,  Michael J. Green

发明人： Vallier Maurice Laforge ,  Geoff A. Bruce-Payne ,  Sarto Barsetti ,  Michael J. Green

IPC分类号： H04J3/06 ,  G06F1/12 ,  G06F13/00 ,  H04L7/00

CPC分类号： H04J3/0641 ,  H04J3/0647 ,  H04J3/0679

摘要： A method for distributing synchronization in an optical communications network is disclosed. In order to keep costs to a minimum, the method consists of deploying requisite primary reference source (PRS) clocks only at those sites having access to more or less than two independent synchronization distribution paths (SDPs). PRS clocks are also preferably installed at sites located substantially far from a site already equipped with a PRS clock. As a result, a small number of PRS clocks end up being installed, leading to substantial cost savings for the telecommunications service provider. Subsequently, a building integrated timing supply (BITS) system is deployed at all sites comprising more than one network element. The BITS has two timing inputs, a primary and a secondary timing reference, selected from two of the accessible SDPs. Synchronization status messaging (SSM) is then enabled at selected network elements in order to prevent the occurrence of timing loops while the number of network elements that need to be equipped with SSM by appropriately choosing which SDPs are used for the primary and secondary timing references.

摘要翻译： 公开了一种在光通信网络中分发同步的方法。 为了将成本降到最低，该方法包括仅在具有多于或少于两个独立同步分配路径（SDP）的那些站点部署必需的主参考源（PRS）时钟。 PRS时钟也优选地安装在远离已经配备有PRS时钟的站点的站点处。 结果，安装了少量PRS时钟，为电信服务提供商节省了大量成本。 随后，在包含多个网元的所有站点部署了建筑集成定时供应（BITS）系统。 BITS具有从两个可访问SDP中选择的两个定时输入，一个主要和次要定时参考。 然后在所选择的网络元件上启用同步状态消息（SSM），以便防止定时环路的发生，同时通过适当地选择哪些SDP用于主要和次要定时参考，需要配备SSM的网络元件的数量。