In the next-generation transport networks the optical layer, typically referred to as “Layer 0” or the “DWDM layer”, is the most cost-effective layer for maximizing fiber network utilization and managing point-to-point traffic that is 10Gbs and higher. DWDM layer is capable of handling traffic at a wavelength layer providing either a 10Gbps or a 100Gbps granularity in the DWDM network depending on the interface used. Since DWDM by itself does not offer any way to consolidate partially filled wavelengths, this leads to a lot of bandwidth wastage. OTN solves this problem by providing sub lambda grooming through an OTN cross-connect at the granularity of 1Gbps. Learn more from this application note