... Can test correspondingly double-twisted cables 1,2,3,4,5,6,7,8andG,meanwhile can judge wrong connection,short circuit ... 1-4-3-2-5-6-7-8-GFollowing are abnormal connections:1.If one cable,for example cable NO.3is open circuited ... the lights is on.3.If two ends of a cable is disordered,for example NO.2andNO.4,then displays on ... of the same axes,BNC turns on when the cable works. network tester TP-NT-003