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rdd, gokhan, jls, tkach) Q research. aft. corn, Phone: 973-360-871 2. FAX: 973-360-8050Because of recent advances and subsequent deployment of dense WDM, a new network layer (the "Optical Layer") has emerged and, therefore, SONET no longer resides at the network layer closest to the media itself. Also, SONET Rings, the primary technology to provide restoration from network failures in today's networks, tend to be capacity inefficient when compared to "mesh" topologies in networks with a high degree of connectivity and when, because of size limitations, connections are forced to route through many interconnected rings. This paper proposes an optic layer restoration method, competitive with SONET ring restoration speeds.We propose a distributed method to do restoration in mesh networks of Optical Cross-Connects (OXCs) with the target of achieving ring-competitive worst-case restoration times. This method assumes a simple fault detection capability in the OXC. In particular, it assumes that the network consists of high speed connections (signals, e.g., ) that route over a mesh of OXCs. Fault detection is done only at the endpoints of where the connection enters (i.e., addldrops from) the OXC-mesh network and thus the addldrop card may be the only component that is aware of the details of its constituent signal. This approach is especially adapted to OXC cross-connect fabrics that are fully optic in nature, i.e., have no electronic signal performance analysis or fault detection capabilities, except at the add/drop ports.The restoration path i s stored for each connection at one of the endpoints of the connection. Because

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