Patent ID: 6331905
Filing Date: 2001-12-18
Classification: H04J,H04Q

Abstract:
A method for restoring a network comprising a plurality of nodes connected by links, wherein each of said nodes comprises a central switch connected to at least one working fiber, comprising the steps of:providing at least one protection switch for making connections to respective ones of a plurality of protection fibers for at least one of said nodes, wherein said protection switch is capable of switching information from a working fiber to a respective one of said plurality of protection fibers;providing mapping data indicative of which of said plurality of protection fibers should be switched to by said at least one protection switch in response to a failure of said central switch, wherein said mapping data is calculated responsive to identified cyclegroups for said network; andif a failure of said central switch occurs, causing said at least one protection switch to switch said information from said working fiber to said protection fiber identified by said mapping data.