... 100BaseT, TIA-568A/568B, AT&T 258-A5.RJ45 Network Cable Tester test correspondingly double-twisted cables 1, 2, 3, 4, 5 ... Ground6.9 LED lights to indicate wiring connection on both remote and master unit7.With this RJ12 Network Cable Tester, you can ... connection, short circuit and open circuit8.Detachable remote tester, test remote cable up to 1000ft. in length8.Auto scanning function for rapid testing9 ...