Availability analysis under multiple link failures in WDM networks with shared-link connections |
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Authors: | Mohamed Mostafa A Azim Muhammad Nomani Kabir |
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Affiliation: | 1. College of Computer Science and Engineering, Taibah University, Al-Madinah Al-Munawwara, Kingdom of Saudi Arabia 2. Faculty of Industrial Education, Beni-Suef University, Beni-Suef, Egypt
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Abstract: | In optical Wavelength Division Multiplexing (WDM) networks, different protection schemes have been proposed in the literature,
namely, dedicated protection and shared protection. Shared protection techniques significantly reduce the required spare capacity
by providing the same level of availability as dedicated protection. However, current mission critical applications (which
heavily depend on the availability of communication resources) require connection availability in the order of 99.999% or
higher, which corresponds to a downtime of almost 5 min a year on the average. Therefore, in order to satisfy a connection
serviceavailability requirement defined by the users Service Level Agreement in a cost-effective and resource-efficient way,
network operators need a systematic mechanism to evaluate the network availability under multiple failure scenario to ensure
that current network configuration can meet the required availability degree; otherwise, a network upgrade is required. Unfortunately,
under multiple failure scenario, traditional availability analysis techniques based on reliability block diagrams are not
suitable for survivable networks with shared spare capacity. Therefore, a new concept is proposed to facilitate the calculations
of network availability. In this paper, we propose an analytical model for evaluating the availability of a WDM network with
shared-link connections under multiple link failures. The analytical model is also verified using Monte Carlo simulation.
The proposed model significantly contributes to the related areas by providing network operators with a quantitative tool
to evaluate the system availability and, thus, the expected survivability degree of WDM optical networks with shared connections
under multiple link failures. |
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