Product Description:

"The following are abnormal connections: If a wire, for example, wire no.3 is open circuit, the two lights no.3 on the main tester and the remote tester will not light. If multiple cables are not connected, multiple lights will not light up respectively. If less than two cables are connected, no lights are on. If two ends of a cable get messed up, for example not. 2and not 4. then it is shown in: Main tester: 1-2-3-4-5-6-7-8-G Remote control: 1-4-3-2-5-6-7-8-g If two wires are shorted, none of the corresponding lights are on by the remote tester while the main tester remains unchanged. If three wires, including three, are short-circuited, none of the corresponding liahts are connected.

If you test patch panels or wall plate panels, two cables that can match each other (rj45) will be connected to the tester. If you test cables from the same axes, bnc turns on when the cable works."