Abstract :
This article presents results from research that included the modeling of various self-healing structures in order to compute the service availability between any two nodes within a given survivable network. In particular, terminal-pair availabilities are computed for a service-bearing transport signal that traverses a unidirectional path-switched ring (UPSR) system, a bidirectional line-switched ring (BLSR) system, a series of interconnected ring (UPSR and/or BLSR) systems, called a ring chain, within a general ring-based mesh network, and a series of interconnected point-to-point systems within a general point-to-point mesh network. In addition, these network structures are evaluated with varying degrees of fiber link and system interconnection node survivabilities; specifically, two-fiber and four-fiber link configurations are evaluated, and an intersystem nodal survivability factor a is used to characterize a transport signal of a given service level. Based on the results of these computations, several key observations are highlighted that should be considered when planning and designing short- and long-haul self-healing networks
Keywords :
network topology; optical fibre networks; planning; telecommunication network reliability; BLSR system; UPSR system; bidirectional line-switched ring; fiber link survivability; four-fiber link; interconnected point-to-point systems; interconnected ring; intersystem nodal survivability factor; long-haul self-healing networks; network modeling; network nodes; network planning; point-to-point mesh network; research; ring chain; ring-based mesh network; self-healing structures; service availability; service-bearing transport signal; short-haul self-healing networks; survivable network architectures; system interconnection node survivability; terminal-pair availabilities; two-fiber link; unidirectional path-switched ring; Algorithm design and analysis; Availability; Computer architecture; Computer networks; Equipment failure; Mesh networks; Optical fiber devices; Signal restoration; Telecommunication traffic; Terminology;
