Packet Transport Networks (PTNs) must resolve issues in their protection and recovery mechanisms.These issues include the detection performance of Operation, Administration and Maintenance (OAM), network resource optimization, resource allocation deadlock, and resource deployment blocking.Traditional protection and recovery mechanisms cannot meet the requirements of PTN.In order to improve the protection and recovery performance, network resource use, probability of service recovery, and to decrease the probability of service blocking, this paper introduces overlapped segment shared protection, Pre-configured Multi-Cycle (P-mcycle), conflict-free algorithm, and delay restoration algorithm.Only with appropriate protection and restoration mechanisms is it possible to achieve smooth evolution from TDM networks to integrated packet-based bearer networks and all-IP services.
展开▼
