AddOn ADD-DWDM-HPMUXDR40M-21-60 Data Multiplexer/Demultiplexer - 40 Channel High Performance DWDM MUX and DEMUX (Duplex), 1U Rack Mount, Channels 21 60, with Monitor Port (2%), LC/UPC Adapters This is a 40 channel 1U 19 Rack mount High Performance DWDM M