Mendelsohn, Drucker & Associates, P.C.
N+1 protection using a processor-based protection device
In an N+1 protection scheme for a router in a data or telecommunications network, a processor-based protection unit has a replica device handle, corresponding to each of the N working units, stored in the protection unit's local memory. Each replica device handle is an image of the connections provided by the corresponding working unit. In one implementation, upon detection of a failure of one of the working units, the router's controller unit sends a single command to instruct the protection unit to reconfigure itself using the corresponding locally stored replica device handle to assume the routing functions of the failed working unit.
LSI Corporation
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Wen N. Jay P. Steven Robert L. Vijayalakshmi Martin Donna M. Swaminathan Ravi Ning Tim
Wang Wilshire Rothweiler Smigielski Kanthamneni Trew Nemshick Venkatakrishnaprasad Krishnaswamy Li Reinhard