Abstract
The metro transport network has been evolving from a purely SONET based network to include other layer 1 and 2 technologies such DWDM/CWDM, IP routers, ATM, and Ethernet. As each category of technology was introduced (as an overlay network) it has had its own domain of Protection/Restoration (P/R) schemes. This has created multiple options for providing survivability for the same service in the network. In addition as network elements have become Multi-Service-Provisioning-Platforms, they have incorporated the P/R and survivability schemes of Layer 1 and 2 technologies, i.e. SONET/DWDM, SONET/ATM, Resilient Packet rings (RPR), etc. These all have blurred the line between layer 1 and 2 and has posed challenges for network survivability options and methods, as well as implementation issues for multi-layer protection mechanisms.
© 2005 Optical Society of America
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