Next Generation Optical Networks
نویسنده
چکیده
A mesh optical network consists of several cross-connecting nodes (Figure 6.1). Some nodes are O-E-O and some all optical. Large nodes are capable of carrying aggregate traffic at extremely high capacities, and also to add–drop and groom traffic. Each interconnecting link consists of many dual fibers (one fiber per direction), and they include signal conditioners (equalization and regeneration) when the optical signal is transported over distances of hundreds of kilometers. The mesh network has excellent protection strategies, as nodes may be reprovisioned to reroute traffic away from the failure condition (fiber cut or failed node). Faults are detected with power detectors and performance parameter thresholds. Reconfiguration may be made autonomous by switching to protection to SONET/SDH standards (switch to protection takes less than 50 ms). Reconfiguration may also be accomplished via network management procedures. More sophisticated management protocols perform reconfiguration to provide traffic balancing and traffic grooming. The Unidirectional Path Switched Ring (UPSR) is a popular and well-studied network topology (Figure 6.2). It is most applicable to small and medium-size LANs and metropolitan ring networks (metros). It consists of a dual-fiber counterrotating ring. Each ring passes the same traffic but in opposite directions (one ring is for service and the other for protection).
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تاریخ انتشار 2003