This is an 8 channel DWDM mux cartridge that operates over channels 25, 26, 27, 28, 29, 30, 31 and 32. It also has pass ports and duplex LC connectors. 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.This is an 8 channel DWDM mux cartridge that operates over channels 25, 26, 27, 28, 29, 30, 31 and 32. It also has pass ports and duplex LC connectors. 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.