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Contact Supplier– The lamp does not turn on – The broken wire state is the connector end of the connector is not connected for any reason, need to fix6. The lamp written GND is the lamp used to test the STP– The lamp is not on – Status UTP cable (normal)– the lamp is lit green – the state of the STP line (but if the tested cable is an STP cable and doesnot turn on, the ground cable is not connected to the end, need to fix)7. After testing, see the lamp status?Finally, have to look at the order of the lamps– if the lamps are arranged in order, such as 1 & 2 3 & 6 4 & 5 7 & 8, then the head is correct.?The end of the connector is connected– if the lamp is in a sequence of jumps, such as 1 & 2 4 & 5 3 & 6 7 & 8, then the cross is connected– if the lamp lights in addition?Shows that the head is wrong.8. In addition, the machine can be tested with a telephone line with connectors RJ11, RJ12 as well.But some bulbs will disappear according to the remaining wire, such as RJ11, 4 wires will only be 3 & 6 4 &