... wavelength*The Spec. is for 1XN Coupler only.1.Order InformationFBT-Type-Port-Wavelength-Coupling Ratio-Fiber ... Length-ConnectorType TypeS=Coupler A=In-Line Attenuator W=WDMPort0101=1x1, 0102=1x2, ..., 0404=4x4, ..., 0132=1x32, ... 1310Coupling Ratio (Attenuation or Stage)01=1/99 or 1dB or 1 Stage, 02=2/98 or 2dB ... tubeK120x80x18 plastic caseB53x60 steel tubeXU19'' x=1,2,3,4 U Rack MountD90x20x9.5 plastic ...