The Cisco ONS 15800 dense wavelength division multiplexing (DWDM) systems (ONS 15800/1 and ONS 15808) are field proven, Internet scale, carrier class optical transport platforms that allows service provider and enterprise customers to maximize the use of installed fiber over long-haul and extended long-haul transmission distances. These platforms were designed to minimize both CapEx and ongoing OpEx expenditures, and have been successfully deployed globally across a wide and diverse customer base.