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Distributed-Controlled Multiple-Ring Networks with Classified Path Restoration
Masahito TOMIZAWA Shinji MATSUOKA Yoshihiko UEMATSU
IEICE TRANSACTIONS on Communications
Publication Date: 1997/07/25
Print ISSN: 0916-8516
Type of Manuscript: PAPER
Category: Communication Networks and Services
multiple-ring, classified path restoration, distributed-control, SDH,
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This paper provides an architectural study of optical multiple-ring trunk-transmission networks using high-speed Time Division Multiplexing (TDM), and proposes two algorithms for distributed control environments. We propose a path-setup algorithm that uses Token protocol over Section Overhead (SOH) bytes, by which network-nodes communicate with each other to reserve bandwidth. A classified path restoration algorithm is also proposed that offers 3 path classes in terms of restoration performance. Class A paths, the most reliable, never lose any bit even against unpredictable disasters. They are realized by path-duplication at the source node, route diversity,and hitless switching at the destination node. Class B paths are restored by re-routing, where the original path-setup algorithm is reused. Class C paths are the most economical because a failed path is restored by maintenance action.