When making a crystal head, make the shrapnel of the crystal head face outward, with the wire inlet facing downwards, from left to right, follow the above wire sequence, fully insert the wires (based on the copper core of the twisted pair seen at the top of the crystal head), and then use a network cable pliers to clamp it.
1. Use cross line connections between devices of the same type, and use straight line connections between devices of different types;
2. Routers and PCs belong to DTE type devices, while switches and HUBs belong to DCE type devices;
3. There are generally two standard methods for RJ45 network connectors: 568A and 568B, with the same standard being the straight line and different standards being the cross line.
No matter how the wiring is done, when testing with the RJ-45 line tester after the final completion, all 8 indicator lights should flash in sequence.