Connection Availability Analysis of Shared Backup Path-Protected Mesh Networks

Author

Zhou, Ling ; Held, Marcel ; Sennhauser, Urs

Author_Institution

Electron./Metrol. Lab. & Reliability Center, Swiss Fed. Labs. for Mater. Testing & Res., Duebendorf

Volume

25

Issue

5

fYear

2007

fDate

5/1/2007 12:00:00 AM

Firstpage

1111

Lastpage

1119

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

Keywords

optical fibre networks; telecommunication network reliability; telecommunication security; telecommunication traffic; arbitrary allocation rule; automatic protection switching; average connection performance; bidirectional connections; connection availability analysis; dual-span failures; failure mode; mesh networks; mesh-restorable network; shared backup path-protection; spare capacity; system unavailability; traffic loss; Analytical models; Associate members; Availability; Failure analysis; Mesh networks; Optical fiber networks; Optical losses; Protection switching; Redundancy; Telecommunication traffic; Connection availability; dedicated automatic protection switching ( $1 + 1$ APS); down time; shared backup path protection (SBPP); traffic loss;

fLanguage

English

Journal_Title

Lightwave Technology, Journal of

Publisher

ieee

ISSN

0733-8724

Type

jour

DOI

10.1109/JLT.2007.893037

Filename

4167978