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1. 发明授权

US06545977B2 Methods and apparatus for routing signals in a ring network 失效
标题翻译：在环网中路由信号的方法和装置
公开(公告)号：US06545977B2
公开(公告)日：2003-04-08
申请号：US09090083
申请日：1998-06-03
申请人： Paramasiviah Harshavardhana , Srinivasan S. Ravikumar , Yufei Wang
发明人： Paramasiviah Harshavardhana , Srinivasan S. Ravikumar , Yufei Wang
IPC分类号： G01R3108
CPC分类号： H04L45/04 , H04J2203/0042 , H04J2203/0053 , H04L12/4637
摘要： Traffic demands are routed in a ring network by first determining an inter-ring path for a given demand, and then independently determining an intra-ring path for the demand on each of the rings in the inter-ring path. The intra-ring path provisioning is fully decoupled from the inter-ring path provisioning, such that the demand can be routed more quickly and efficiently. For example, both the routing direction and the interworking nodes for a dual ring interworking (DRI) connection can be determined independently for each of the rings of the inter-ring path. The invention may be implemented in the form of a hybrid centralized/distributed network architecture, in which a central operations system or other central controller determines the inter-ring path by applying a shortest path algorithm to a ring graph in which nodes represent rings in the network and links represent ring interconnections in the network. Ring controllers in the rings of the inter-ring path then each independently determine an intra-ring path for their corresponding rings. Although particularly well suited for use with DRI, the invention can also improve routing performance in single ring interworking (SRI) applications, as well as applications involving combinations of DRI and SRI.
摘要翻译：通过首先确定给定需求的环际路径，然后独立地确定环中路径中每个环上的需求的环路内路径，在环网中路由业务需求。环内路径配置与环际路径配置完全解耦，使得可以更快更有效地路由需求。例如，双环互通（DRI）连接的路由方向和互通节点都可以独立地确定环形路径的每个环。本发明可以以混合集中/分布式网络架构的形式实现，其中中央操作系统或其他中央控制器通过将最短路径算法应用于环形图中来确定环路间路径，其中节点表示环中的环网络和链路表示网络中的环形互连。环路径环中的环控制器各自独立地确定其相应环的环内路径。尽管特别适用于DRI，本发明还可以改善单环互通（SRI）应用中的路由性能，以及涉及DRI和SRI组合的应用。

2. 发明授权

US06195780B1 Method and apparatus for generating cyclical redundancy code 失效
标题翻译：用于生成循环冗余码的方法和装置
公开(公告)号：US06195780B1
公开(公告)日：2001-02-27
申请号：US08987927
申请日：1997-12-10
申请人： Subrahmanyam Dravida , Srinivasan S. Ravikumar
发明人： Subrahmanyam Dravida , Srinivasan S. Ravikumar
IPC分类号： H03M1300
CPC分类号： H03M13/091 , H03M13/6508
摘要： The specification relates to a method and an apparatus for generating cyclical redundancy code (CRC) by analyzing segmented groups of bits from a message concurrently, producing a temporary remainder value as a result of a multiple bit lookup from a generating CRC lookup table, using the temporary remainder or a portion thereof along with the next sequential segmented group of message bits as exclusive-or inputs, taking the result of the exclusive-or output and applying the result as a lookup value from the generating CRC lookup table. The process is repeated until the message groups have been depleted, at which time the message is completely coded and the temporary remainder existing at the time represents the CRC checkbits for the message. The recursive method developed in association with the present invention is called a Recursive Syndrome Expansion (RSE).
摘要翻译：本说明书涉及一种用于通过从消息中同时分析分组的比特组来产生循环冗余码（CRC）的方法和装置，其使用生成CRC查找表从多个比特查找结果产生临时余数值，临时剩余部分或其一部分以及下一个顺序分组的消息比特组作为排他或输入，取出排他或输出的结果，并将结果作为查询值从生成CRC查询表中应用。重复该过程直到消息组已经耗尽，此时消息被完全编码，并且此时存在的临时余数表示消息的CRC校验位。结合本发明开发的递归方法称为递归综合征扩张（RSE）。

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