... performance For RJ45,RJ12,RJ11&BNC1.Functions:1.Can test correspondingly double-twisted cables 1,2,3, ... 4,5,6,7,8andG,meanwhile can judge wrong connection,short circuit and open circuit. ... not turn on.2.If several cables are not connected,several lights will not turn on respectively.If ... plate outlels,two cables which can match each other(eg110 P4 and RJ45)will be connected to the tester.iv.If ...