... used to combine or split 1310nm and 1550nm optical signals, which double the fiber transmission capability ... - - - Fiber Type:0=SMF-28, 1=flexcore, - - - - 2=50/125m, 3=62.5/125m,4=others - - - Pigtail Type ... :0=250m, 1=900m, 2=2mm, - - - 3=3mm, 4=others - - Operating Wavelength ... - - 1315=1310&1550nm etc. - Port Number:1×2, 2×2 etc. Grade: U=Ultra,P=Perfect, A=Grade A, ...