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Playing is the new 4 core network production method graphic analysis

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Playing is the new 4 core network production method graphic analysis

Date:2017-10-11 Author: Click:

Author: wind and rain

As you all know, cable is one of the most basic hardware facilities on the Internet, and also the most inconspicuous equipment. We are accustomed to buying ready-made, that is already made good cable, very little care about how the line is done, only know that the cable must be composed of 8 core lines, when buying 8 core line can be seen. Can realize the data transmission to the 8 core wires? No, in fact, the 4 core wires can also help you to complete the data transmission.

Advantage

1. easy to manufacture and fast.

2. only with 4 cores, it is not easy to be confused when making, so as to avoid the possible damage to crystal head caused by pressing mistake.

3. because of the simple production, can be used to temporarily make test network jumper, the network management is very helpful.

shortcoming

1. sometimes transmission instability occurs.

2. is not suitable for large networks.

Application range

Compared with the 8 core cable, the 4 core network does not seem to have outstanding advantages, but it is very useful in specific occasions. For example, when we make a jumper for testing, we can make it quickly, saving time; it's often used when making short lines. It is worth noting that the 4 core cable is widely used in the current transmission network.

Charging: working principle

To understand the working principle of the 4 core network, we need to understand the working principle of ordinary network cable. Twisted pair can be divided into three types, four categories, five categories, over five categories, six types, seven types of twisted pairs and other types. At present, there are five classes, over five or six unshielded twisted pairs in general lan.

Twisted pair peeling, there are 8 core wires, are: green and white, green, orange and white, orange, blue, blue and white, brown, white and brown, 22 pairs of intertwined, usually we are using all 8 cable core wires. There are two international standards for the manufacture of twisted pair, EIA/TIA568A and EIA/TIA568B respectively. There are two kinds of connection methods for twisted pair, which are straight cable and cross cable respectively. Simply, straight through cable is the crystal head at both ends at the same time using T568A or T568B connection; and the crossover cable is the crystal head at one end by T586A standard production, and the other end of the T568B standard production, namely A 1, corresponding to the first crystal 2 B crystal head 3, 6, 3, and 6 corresponding B A first crystal crystal head 1, 2. Others remain unchanged.

T568A standard connection sequence from left to right are: 1- green white, 2- green, 3- orange white, 4- blue, 5- blue white, 6- orange, 7- brown white, 8- brown.

T568B standard connection sequence from left to right are: 1- orange white, 2- orange, 3- green white, 4- blue, 5- blue white, 6- green, 7- brown white, 8- brown.

Although there are 8 twisted pair cable core, but in the widely used Ethernet, actually only 4 of them, namely first, second, third, sixth, respectively with a signal receiving and sending function. Then there is the production of the 4 core lines of the novel, also called 1-3, 2-6 cross connection, the core wire cross network cable arrangement rule is: third feet first feet at one end of the cable connected to the other end of the end of second, sixth feet of cable is connected at the other end of the other foot, corresponding to the cross cable also in the above described method is put in the 4 lines do not spare aside.

Get started: steps to make

The paper introduces the production principle of the 4 core network cable, below we start 4 core network specific production. Of course, we need to prepare the clamp and crystal first class tools.

Tools needed: twisted pair, RJ-45 crystal head, line clamp, cable tester

The first step: stripping

We need to peel off the protective layer grey twisted pair, can use the knife to cut the line line clamp thread cut, then the thread into the special wire stripping knife, a little hard to hold the line clamp slowly rotating, knife cut protection rubber twisted pair. Then remove the part of the protective rubber.

Tip: the line clamp gear from the stripping length of the blade is usually just a crystal head length of about 15mm, the quality is too long or too short will affect the cable.

The second step: the order of arrangement

We need to untangle each pair of wires that are intertwined. After the release, according to the wiring rules, several groups of cables arranged and straightened in sequence, should pay attention to avoid winding and overlap, but also try to pull the cable straight as far as possible. Let's take the T568B standard as an example.

A end crystal head corresponds to: 1- orange white, 2- orange, 3- green white, 6- green.

The B crystal head corresponds to (1, 2 corresponds to the A end of 3, 6, 3, 6 corresponding to the B end of 1, 2): 1- green white, 2- green, 3- orange white, 6- orange.

The third step: check and insert the crystal head

Good order and straighten, we need to use wire cable cutting knife top crimping pliers neatly (Figure 1), then put good cable into crystal head. It is important to note that the head of the crystal has a stitch on one side, so that the square hole ends at itself. At this point, the left side is first feet, the right side is eighth feet, the rest arranged in turn. When inserting, it is necessary to pay attention to the 4 cables inserted into the 4 corresponding slots in the RJ-45 head at the same time, and inserted them into the top of the slot.


玩的就是新奇4芯网线制作法图文解析

The fourth step: suppression

After confirming the mistake, the crystal head can be inserted into the pressure groove in the middle of the line clamp to carry out the pressure line. After the crystal head is inserted, press the clamp tightly, just listen to the slight "bang" sound. This process makes the crystal head protrude out and all the pins are pressed into the crystal head (Fig. 2). After pressing the A end, the B end can be finished by the same method.


玩的就是新奇4芯网线制作法图文解析

Acceptance: test cable

After making the network cable, in addition to the computer can test whether the work is normal, we can also use the network tester to test. Let's take the "expert" wire testers that we've used so much for example.

After inserting the interface between the two ends of the tester into the two interfaces of the tester, opening the tester, you can see that the two sets of indicator lights on the tester are flashing RJ-45. We can see one of the ends flashing green lights in the order of 1, 2, 3, 6, while the other side flashes the green light in the order of 3, 6, 1, 2. The above information indicates that the network line is successful, and the data can be sent and received (Fig. 3).

玩的就是新奇4芯网线制作法图文解析

Figure 3

If there is red or yellow, it proves the existence of bad contact phenomenon, it is best to use the line clamp pressing both ends of a crystal head, then, if the fault still exists, we have to check whether the correct sequence of core wire. If the core line is wrong in sequence, it should be made again.

Hint: if the test cable is a straight cable, the 8 lights on the tester should blink in turn. If the cable is a cross cable, one side blinks in turn, while the other side flashes in the order of 3, 6, 1, 4, 5, 2, 7, 8. If the core line is the same, but the tester still shows red or yellow light, which shows that there must be corresponding to the bad contact of the core line. It's time to redo the crystal head.

The production method of the 4 core lines above, you must see light suddenly feeling! Indeed, the 4 core lines with the traditional 8 core lines are not too special place, but we are more deeply about the working principle of cable, put superfluous things aside, thus greatly improving the efficiency of our work can be in the production line, but also can be reduced because the extra spending suppress wrong lead crystal head damage, Why not??


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