... 7-8-GFollowing are abnormal connections:1.If one cable,for example cable NO.3is open circuited,the two NO.3lights ... the lights is on.3.If two ends of a cable is disordered,for example NO.2andNO.4,then displays ... none of the corresponding liaghts is on.iii.If test patch panels or wall plate outlels,two cables which can ... cables of the same axes,BNC turns on when the cable works. network tester TP-NT-003