Availability Analysis of Shared Backup Path Protection Under Multiple-link Failure Scenario in WDM Networks
Dedicated protection and shared protection are the main protection schemes in optical wavelength division multiplexing (WDM) networks. Shared protection techniques surpass the dedicated protection techniques by providing the same level of availability as dedicated protection with reduced spare...
| Main Authors: | , |
|---|---|
| Format: | Article |
| Published: |
Springer
2014
|
| Subjects: | |
| Online Access: | http://umpir.ump.edu.my/id/eprint/6947/ http://umpir.ump.edu.my/id/eprint/6947/ http://umpir.ump.edu.my/id/eprint/6947/ |
| Summary: | Dedicated protection and shared protection are
the main protection schemes in optical wavelength division
multiplexing (WDM) networks. Shared protection techniques
surpass the dedicated protection techniques by providing
the same level of availability as dedicated protection
with reduced spare capacity. Satisfying the service availability levels defined by the user’s service-level agreement (SLA) in a cost-effective and resource-efficient way is a major challenge for networks operators. Hence, evaluating the availability of the shared protection scheme has a great interest. We recently developed an analytical model to estimate network availability of a WDM network with
shared-link connections under multiple link-failures. However, this model requires the information of all possible
combinations of the unshared protection paths, which is
somehow troublesome. In this paper, we propose a more
practical analytical model for evaluating the availability of a WDM network with shared-link connections under multiple
link-failures. The proposed model requires only an
estimate of the set of shared paths of each protection path.
The estimated availability of the proposed model accurately
matched with that of the previous model. Finally, we compare the previous model with the proposed model
to demonstrate the merits and demerits of both models
illustrating the threshold at which each model performs better based on the computational complexity. The proposed
model significantly contributes to the related areas by providing network operators with a practical tool to evaluate quantitatively the system-availability and, thus, the expected survivability degree of WDM optical networks with shared connections under multiple-link failures. |
|---|