This CX-1x4-x (DEMUX) module is optical converter and will convert from four FP laser or CWDM laser wavelength to Multiplexed 1290nm - 1350nm or 1510nm -1570nm range (MUX) or opposite direction (DEMUX) from Multiplexed 1290nm - 1350nm or 1510nm - 1570nm range signal to four FP laser or CWDM laser wavelength. This unit is compatible with all Meridian products as well as many other fiber transmission products in the market.