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WDM design one of the important tasks.
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WDM Link designer should be aware how to understand customer needs, define network topology, calculate and determine link specifications.
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Analyze traffic capacity, traffic routes, losses calculation, protection, features will be added.
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Also cost analysis and availability.
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Availability is an important factor, it define the ability of the node or the network to provide the required function during given time.
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Availability is A, unavailability is 1-A.
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Availability can be measured in minutes or seconds per year.
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For example, if the availability is 99.99% then the down time of the network per year should not exceed 52 min and 33 seconds.
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Another example if the availability 99.999% that means downtime / Year is 5 minutes 15 seconds.
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Designer should focus on how to improve the availability of the network and if the availability can’t meet the threshold we have to optimize the network.
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Network optimization can be through network routes control, configuration control, protection control.
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Operators expect availability 99.99% or 99.999%.
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There’s 525600 minutes / Year.
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