Transition Networks Coarse Wavelength Division Multiplexing (CWDM) 4 Channels + OSC Duplex LCUnlock the full potential of your existing fiber infrastructure with Transition Networks CWDM solution. This passive Coarse Wavelength Division Multiplexing (CWDM) module delivers four distinct channels plus an Optical Supervisory Channel (OSC) over a single duplex fiber pair using LC connectors. Designed to transport any protocol at defined wavelengths, this compact Mux Demux and Add Drop Mux solution provides a simple, cost effective path to