Ciena NTK553MA is a WSS Flex C-Band board with OPM 20x1 for WDM and optical transport applications. It is used in reconfigurable optical networking environments that require wavelength selective switching, optical performance monitoring and flexible C-Band signal management. This board is associated with the NTK504CA Fiber Interconnect Module FIM Type 1 and is suitable for ROADM, wavelength routing, network expansion and spare parts replacement projects.