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2. 发明申请

WO03019833A2 SDH/SONET HITLESS SWITCHING 审中-公开
标题翻译： SDH / SONET无线切换
公开(公告)号：WO03019833A2
公开(公告)日：2003-03-06
申请号：PCT/IL0200715
申请日：2002-08-29
申请人： RADIOTEL LTD , LEVY RONY , TOPMAN ZVI , LOTAN ELI , TOPMAN MOSHE
发明人： LEVY RONY , TOPMAN ZVI , LOTAN ELI , TOPMAN MOSHE
IPC分类号： H04J3/06 , H04J3/14 , H04J3/16 , H04Q11/04 , H04L25/14
CPC分类号： H04J3/0623 , H04J3/14 , H04J3/1611 , H04J2203/006 , H04J2203/0094
摘要： In a system for transmitting a digital data stream, wherein the data are formatted into a series of virtual containers (VCs) and routed through several paths in parallel - a method for hitless switching between the versions that arrive over the various paths. The method includes inserting into each VC an identifying code and a parity checksum, or, in the case of a multi-segment VC, a checksum for each segment. At the node of convergence the method calls for delaying any received version by a respective amount, such that will cause all the versions to become aligned in time, so that VCs having the same identifying code flow synchronously byte-for-byte. For each received version and for each VC or segment, parity is calculated and compared with the corresponding checksum, to determine a respective error level. The error levels are compared among the versions for each successive VC or segment and the VC or segment with the lowest error level is selected and inserted into an output data stream. Whenever the version, from which a next VC or segment is selected, changes, switching occurs at the boundary between successive VCs or segments, thus avoiding hits.
摘要翻译：在用于发送数字数据流的系统中，其中数据被格式化成一系列虚拟容器（VC）并且并行地通过若干路径路由 - 用于通过各种路径到达的版本之间的无连接切换的方法。该方法包括在每个VC中插入识别码和奇偶校验和，或者在多段VC的情况下插入每个段的校验和。在收敛节点，该方法要求将任何接收到的版本延迟相应的量，这样将导致所有版本在时间上对准，使得具有相同标识码的VC以字节为单位流同步。对于每个接收的版本和每个VC或段，计算奇偶校验并与对应的校验和进行比较，以确定相应的错误级别。在每个连续VC或段的版本之间比较错误级别，并选择具有最低错误级别的VC或段并将其插入到输出数据流中。每当选择下一个VC或段的版本发生变化时，切换将发生在连续VC或段之间的边界处，从而避免命中。

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