Abstract
Dual-span failures dominate the system unavailability in a mesh-restorable network with full restorability to
single-span failures. Traditional availability analysis based on reliability block diagrams is not suitable for
survivable networks with shared spare capacity. Therefore, a new concept is proposed to facilitate the calculations
of connection availability. A U.S. network consisting of 19 nodes and 28 spans yielding 171 bidirectional
connections is investigated. We find that networks with shared backup path protection can have average connection
unavailabilities of the same order of magnitude as those with dedicated automatic protection switching, however,
with a much better capacity efficiency. The proposed method can exactly calculate the unavailability of a specific
connection with known restoration details or the average connection performance without any restoration details by
presuming the dual-span failures to be the only failure mode and an arbitrary allocation rule of spare capacity.
© 2007 IEEE
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