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One of the most important steps in WDM design is to choose the suitable network architecture.
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We have 2 types:
- Flat architecture.
- Hierarchical architecture.
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We have to confirm protection types and traffic growth conditions first to determine the network architecture.
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When we design the WDM, we have to ensure 2 main things:
- Quality and availability.
- Traffic growth.
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Advantages of using flat architecture is simplicity and bandwidth.
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If the network is huge , traffic replanning will require the entire network rearrangement.
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For hierarchical architecture, we dividing the network in to areas, and we have to define gateway Nodes between areas.
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Then each area can be planned and managed independently.
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Big advantage for this type of architecture is the ease of traffic expansion, adding sites, traffic growth.
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Disadvantage of hierarchical architecture is that the high cost , complexity , require more network resources.
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