... ,7,8andG,meanwhile can judge wrong connection,short circuit and open circuit.2.NS-4688tests BNC,RJH and RJ45;NS-468 ... connections:1.If one cable,for example cable NO.3is open circuited,the two NO.3lights of the main tseter and remote tester ... .If two ends of a cable is disordered,for example NO.2andNO.4,then displays on:Main tester:1-2-3 ...