Do You Know How The Cable Is Made?
The network cable is essential for connecting to the LAN. The common network cables in the LAN are mainly twisted pair, coaxial cable, and optical cable. Twisted pair is a data transmission line composed of many pairs of wires. It is characterized by its low price, so it is widely used, such as our common telephone line. It is used to connect to the RJ45 crystal head.
Production of network cable
Cut: Cut the appropriate length of the cable with the wire cutter of the crimping tool.
Peeling: Cut the thread with the wire cutter of the crimping pliers, then put the thread into the stripping knife, let the thread head and the baffle, slightly tighten the crimping tool and slowly rotate it to make the knife edge open the protection of the twisted pair. Rubber, remove the rubber. (Note: peeling is as long as the thumb.) [Small Tips] The length of the wire clamp position is usually the length of the crystal head, which can effectively prevent the stripping from being too long or too short. If the stripping is too long, it is not beautiful. On the other hand, because the cable can not be caught by the crystal head, it is easy to loosen; the stripping is too short, because the foreskin exists, it is too thick, and can not be completely inserted into the bottom of the crystal head, causing the crystal head pin Can not be in good contact with the core of the network cable, of course, can not be made successfully.
Sorting: After stripping the foreskin, you can see the 4 pairs of 8 cores of the twisted pair cable, and you can see that the color of each pair is different. The two cores of each pair are composed of a full-color sheathed wire and a white or half-colored sheathed wire. The colors of the four full-color cores are: brown, orange, green, and blue. When making the network cable, the eight thin wires of the four wire pairs must be taken apart one by one, straightened out, straightened, and then arranged in the prescribed line order. Arrange the 8 heads of the crystal head: the side of the crystal head with the spring material is downward, and the one side of the stitch is upward, so that one end of the stitch is pointed away from the direction of itself, and one end of the square hole is facing itself. The leftmost one is the 1st foot, the far right is the 8th foot, and the rest are arranged in order.
Cut the line: Straighten the line as much as possible (do not wrap), flatten (do not overlap), squeeze tightly (close in one direction), and then use a crimping tool to cut the thread. In this way, after the twisted pair is inserted into the crystal head, each line can well contact the pins in the crystal head to avoid poor contact. If the previously peeled skin is too long, the long thin wire can be cut short here, and the remaining part of the outer insulation is about 14 mm, which is just the length to insert the thin wires into the respective wire grooves. If the section stays too long, crosstalk will increase due to the pair being no longer twisted. Secondly, the cable may not be pressed against the sheath, which may cause the cable to come out of the crystal head, resulting in poor contact or even interruption of the line. .
Insert: One and pinch the crystal head with the thumb and middle finger so that the side with the plastic shrapnel is down, the side of the pin is facing away from you and is pressed with the index finger; the other hand pinches the rubber outside the twisted pair, slowly exerting force Insert 8 wires simultaneously into the 8 slots in the RJ-45 head and insert them all the way to the top of the slot.
Pressing: After confirming that all the wires are in place and checking the wire sequence through the crystal head, the RJ-45 head can be clamped by crimping. After pushing the RJ-45 head from the toothless side into the crimping jaw slot, firmly grip the wire clamp (if you are not strong enough, you can press it with both hands) and push all the protruding pins into the crystal. And within the head.