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The impact of the frequency grid on the CAPEX required to deploy a multi-layer IP/MPLS-over-EON is analyzed. Results showing significant savings at the electronic layer motivate the introduction of narrower grids with enhanced BV-WSS. The emergence of new disruptive bandwidth intensive services and applications has led to a huge surge of IP traffic which, ultimately, has brought to light the clear granularity mismatch between the client layer and current wavelength-routed optical layer. This issue results in a highly inefficient use of the network capacity, and consequently, in multi-layer networks requiring a large amount of highly expensive, power-consuming IP/MPLS equipment to be installed for grooming/aggregation purposes.
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