Method of reducing synchronization rearrangements

专利名称：Method of reducing synchronization

rearrangements in synchronous transmissionsystems

发明人：Rodger J. Williams,Craig Donald Suitor申请号：US090315申请日：19980227公开号：US06185247B2公开日：20010206

专利附图：

摘要：The invention substantially reduces the occurrence of unnecessary

synchronization rearrangements in nodes within synchronous transmission systems such

as SONET networks. In one embodiment of the invention, the method disclosed forreducing synchronization rearrangements within interconnected nodes of a synchronoustransmission system includes the steps of: detecting, at a node within the synchronoustransmission system, a change in a synchronization status message received at the node;propagating the changed synchronization status message from the node to anothernode within the synchronous transmission system if the changed synchronization statusmessage corresponds to an active timing reference; waiting a specified amount of timeupon detection of the change in the synchronization status message; then determiningwhether a synchronization rearrangement is necessary at the node; and then performinga synchronization rearrangement at the node if necessary. In another embodiment of theinvention, the method disclosed for reducing synchronization rearrangements withininterconnected nodes of a ring transmission system, includes the steps of: updating asynchronization status message upon a change in synchronization signal quality at a firstnode of the ring transmission system; transmitting the updated synchronization statusmessage from the first node to a plurality of other nodes within the ring transmissionsystem; propagating the updated synchronization status message from each of theplurality of other nodes to another node of within the ring transmission system if theupdated synchronization status message corresponds to an active timing reference;waiting a specified amount of time upon an arrival of the updated synchronization statusmessage at each of the plurality of other nodes; determining for each of the plurality ofother nodes whether a synchronization rearrangement is still necessary; and thenperforming a synchronization rearrangement if necessary.

代理机构：Foley & Lardner

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