... Mode ( 50/125 um , 62.5 / 125 um , )3.Specification: single core , dual - core , the 4 core , 6 cores , 12 core ... ,6,8,10,12 etc. Technical Parameters : 1 . Insertion Loss ( Single - Mode : PC ≤ 0.2 db ,APC ≤ 0.3 db , ... Multi - Mode : PC ≤ 0.3 db ) . 2 . Return Loss ( Single - Mode : PC ≥ 50 db , APC ≥ 50 db , Multi - Mode : ... 3 . The test equipment . 4 . The broadband network . 5 . The fiber CATV