After both ends of the crystal head are ready, you can use the network cable tester to test. If the eight indicator lights on the tester are flashing green in turn, it proves that the network cable is successfully made. If any of the lights is red or yellow, it proves that there is an open circuit or poor contact. At this time, it is best to first press the crystal heads at both ends and then use the network cable clamp to test again. If the fault persists, check both ends. Whether the arrangement order of the core wires is the same, if not the same, cut off one end and make the crystal head according to the arrangement order of the other end. If the core wire sequence is the same, but the tester still displays a red or yellow light after retesting, it indicates that there must be a bad contact of the corresponding core wire. At this time, there is no way. I have to cut off one end and redo a crystal plug in the order of the core wire of the other end, and then test. If the fault disappears, you do not need to redo the other crystal plug, otherwise you have to replace the original crystal plug. Also cut and redo. Until all the testing indicator lights are green.
