This is a 40 channel 1U 19 Rack mount High Performance DWDM Mux and Demux that operates over channels 21 - 60 and it includes Monitor Ports and duplex LC connectors. It is also capable of withstanding rugged environments and can operate at industrial temperatures. This unit can be used as either a multiplexer or de-multiplexer (mux/demux), and is a plug and play system. All of our mux/demux products are 100% compliant and provide a cost effective solution for your network upgrade needs. With our certification test program, we guarantee your product will work correctly the first time.