To connect to LAN, network cable is essential. There are three kinds of common cable in LAN: twisted pair, coaxial cable and optical cable. Twisted pair is a data transmission line made up of many pairs of wires. It is characterized by cheap prices, so it is widely used, such as our common telephone lines, etc.. It's connected to the RJ45 crystal head. It has two kinds of STP and UTP, and we usually use UTP.

Standard of network cable

There are two standards for twisted pair terminals: T568A and T568B, and there are two kinds of twisted pair connection methods: through cable and cross cable. Both ends of the crystal head of the straight cable follow the T568B standard, each line of the twisted pair is one-to-one correspondence at the ends, and the color is the same in the corresponding grooves at the ends of the crystal head. It is mainly used in the switch (or hub) Uplink port to connect the switch (or hub) common port or switch common port to connect to the computer network card. While the crystal head end crossover cable based on 568A, and the other end is using the 568B standard, namely A 1, corresponding to the first crystal 2 B crystal head 3, 6, 3 and 6, corresponding to B A first crystal crystal head 1 and 2, which is mainly used in the switch (or hub) common port connection to switch (or hub) or even ordinary port card card.

In horizontal wiring, GB 50312 accepts class T568B or class T568, but does not allow installation at the same time, usually terminated by class T568B.

Network pressure clamp for producing network cable

Cut: cut the line edge by clipping line clamp cable proper length.

By peeling crimping pliers cut line edge will thread cut, then put the thread stripping knife, let the thread angle and baffle slightly hold line clamp rotates slowly, let the knife cut protection rubber twisted pair, pull off rubber. (Note: Peel with the thumb on the line as long as the [tips]) cable clamp gear from the stripper blade length usually just as the length of the crystal head, which can effectively avoid stripping too long or too short. Stripping a long unsightly, on the other hand is crystal head stuck, because the Internet can not easy to loose; stripping too short, because the foreskin is too thick, there can not be completely inserted into the bottom of the crystal head, causing crystal head core wire and cable pin can not be good contact, certainly not making success.

Sorting: after stripping the foreskin, you can see the twisted pair of 4 pairs of 8 wire, and you can see each pair of colors are different. Each pair of twisted wires is composed of a full color sheath line and a white or half color sheath line. The color of the four full-color cores is brown, orange, green, blue. When making the network cable, you must take 4 wire pairs of 8 fine wire one by one to open, straighten out, straighten straight, and then arranged in accordance with the provisions of the line order. 8 pin arrangement: the first crystal crystal head shape material spring side down, a direction pin, so that one end has pin pointing away from the direction of their own, one square hole to himself, at this time, the first on the left foot, the right is eighth feet, the rest followed by order.

Cut the line to straighten (not winding), flat (do not overlap), squeezing out (in one direction, then close to) wire clamp the thread cut flush. In this way, after the double stranded wire is inserted into the crystal head, each line can well contact the pin in the crystal head, so as to avoid the bad contact. If the skin had been stripped too long, the length of the long thin wire could be cut here, and the part of the outer insulation which was removed was about 14mm. This length could be used to insert the fine wires into the respective slots. If the section is left too long, will no longer on the line due to mutual aid and increase crosstalk, and secondly because the crystal head can not suppress the sheath can lead to cable to emerge from the crystal head, causing the line contact or even interrupt.

Insert: with thumb and middle finger pinch the crystal head, so that one side plastic shrapnel pin down, one moving toward and away from their own direction, and the index finger against; the other hand pinch twisted outside rubber, slowly force the 8 wires along the 8 slot in the head of RJ-45 insert has been inserted into the top slot.

Suppression: make sure all the wires are in place and check the line head through the crystal head, then you can clamp the RJ-45 head with the line. One side of RJ-45 from the teeth into the wire clamp head groove, squeezed line clamp (if your strength is not big enough, you can use both hands together, will highlight the pressure) on the outside of the pin is pressed into the crystal head in all.

test

After the ends of the crystal head have been done, the network tester can be used to test, if the tester on the 8 indicators are in turn green flash, proved successful cable production. If any one light is red or yellow, have proved the existence of circuit or poor contact, the best of both ends of crystal head and then cable clamp pressure once again, if the fault still, then check the two ends of the core line sequence is the same, if not the same, with the cut end to the other end of the core line sequence making crystal head. If the core line sequence is the same, but the tester still shows red or yellow light after the retest, which indicates that there must be a bad contact between the core wires. At this time no way, had to cut off the end of the other end of the core wire in order to redo a crystal head, then, if the fault disappears, don't have to redo the other end of the crystal head, otherwise have to the other end of the original crystal head cut redo. Until the test is all green lights flashing. For the different methods of production, the order of the indicator lights on the tester is different, if it is on the straight line tester