https://www.soniccomponents.com/optical-add-drop-multiplexer-oadm/ Ciena is a Wavelength Division Multiplexing (WDM) wavelengths Ciena SELECTIVE MUX/DEMUX (SMD) FLEX C-BAND 8X1 CIRCUIT PACK - NTK553GB (Refurbished) @ciena #selective #mux #demux #smd #cband #ntk553gb @SonicComponents20