About the White Paper:
The Optical Layer can provide its IP clients rapid and efficient restoration for link failures, however its inability to protect against router failures erodes its attractiveness. Here, we propose a joint IP/Optical restoration mechanism suitable for IP offices with minimum of two backbone routers and an optical cross-connect. The OXC is used to re-terminate OC-48/OC-192 links from a failed BR to its mate. The entire interoffice portion of the reterminated link is reused, thus minimizing the amount of additional link capacity required to protect against router failures. A similar approach applicable when there are tunable transceivers but no OXC is also described. In this paper we concentrate on one of these functions, restoration - the recovery of service after a fiber cut or equipment failure. |
