This is a compact 2ch DWDM mux/demux with 2m pigtails that operates over 100GHz C-Band channels 21-22 with a monitor and an express port. 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.