[Group chart] RJ45 network cable Creation

When dealing with computer networks, it is inevitable that network cables should be used frequently. In fact, the production of Network cables is very simple, that is, to insert the 4-to-8-Core Cable of twisted pair wires into the crystal head according to certain rules, therefore, the materials required for the production of such network cables only need twisted pair wires and crystal heads. The required tools are also relatively simple. Generally, only one dedicated crimping clamp is required. The production of twisted pair cable is actually the production of the cable crystal head. The difficulty of the production of such a network cable is that the rules of the cable jumper vary for different purposes.
　　

1. Fabrication of straight-through RJ-45 Connector

Step 2: Use a twisted pair wire clamp (of course, you can also use other cutting tools) to cut one end of the Five twisted pair wires (it is best to cut a cable that meets the wiring length requirements first ), then insert the end of the cut to the Gap used by the Wire Clamp for wire stripping. Note that the network cable cannot be bent and inserted directly until the block behind the network clamp is pinned, slightly tighten the Wire Clamp slowly rotate a circle (do not worry about damage to the core line inside the network, because there is a certain distance between the two blades, this distance is usually the diameter of the four core lines inside ), remove the protection rubber of twisted pair wires from the knife port. As shown in. Of course, you can also use a special wire stripping tool to peel the wire.
[Tips] the length of the block position of the network clamp is usually exactly the length of the crystal head from the stripping knife port. This can effectively prevent the wire from being too long or too short. If the wire is too long, it is not beautiful. On the other hand, the cable cannot be stuck by the crystal head and is easy to loosen. The wire is too short. Because of the existence of the foreskin, it is too thick and cannot be completely inserted to the bottom of the crystal head, the crystal head plug-in cannot be in good contact with the core line of the network cable, of course, it cannot be created successfully.

　　　　　　　　　　　　　　

Step 2: After the outer foreskin is peeled off, you can see the 4-to-8-core wires of the twisted pair cable, and the colors of each pair are different. Each pair of core wires is composed of a colored core wire and a white core wire with only a few colors. The four full-color cores are brown, orange, green, and blue.
First, four pairs of core lines are arranged side by side, and then each pair of core lines are separated (note that the lines are not arranged across lines, that is, each pair of core lines is arranged adjacent ), and arranged in a unified order (for example, the left is unified as the main color core line, and the right is unified as the color of the flower core line. Note that each core line must be dropped straight and arranged separately and in parallel. Then use the wire clamp to cut the cables perpendicular to the core line (do not cut them too long, just cut them together), as shown in. The order of numbers from left to right is "1.2.3.4.5.6.7.8 ".
　　　　　　　　　　　　　　　　　　　

Step 2: Hold the crystal head horizontally on the left hand side (one side of the plastic buckle is down, and the opening is facing to the right), and then align the eight cores in parallel with the opening of the crystal head and insert them into the crystal head side by side, note that each core wire must be inserted at the bottom of the crystal head and cannot be bent (because the crystal head is transparent, so we can clearly see the position of each core line inserted from the side of the crystal head with a card position ).
Step 2: confirm that all the core wires are inserted at the bottom of the crystal head. Then, you can directly Insert the crystal head inserted into the Wire Clamp crimping gap, as shown in. Because the gap structure is the same as the crystal head structure, it must be correctly placed in order to make the following Pressure clamp handle when the pressure position is correct. After the crystal head is placed, you can press the wire clamp handle, be sure to work hard, so that the connector of the crystal head can be inserted into the core line of the network cable, with good contact. Then, use your hand to gently pull the network cable and the crystal head to see if it is pressed tight. It is best to press it once more. The most important thing is to pay attention to the correct pressure position.

　　　　　　　　　　　　　　　

　

So far, this RJ-45 head is better. Follow the same method to create the crystal head at the other end of the twisted pair wire. Note that the core line sequence must be the same as that at the other end, so that the entire network cable can be created.
After the crystal heads are prepared at both ends, the network cable tester can be used for testing. If the eight indicators on the tester are green, the network cable is successfully created. If any lamp is a red or yellow light, it indicates that there is an open circuit or poor contact. At this time, it is best to press the crystal head at both ends with a wire clamp and then test again. If the fault persists, then, check whether the order of the core lines at both ends is the same. If the order is different, the crystal head will be made again according to the order of the core lines at the other end. If the core line sequence is the same, but the tester still displays a red or yellow light after re-acquisition, it indicates that the corresponding core line is not in good contact. There is no way at this point, so you have to cut one end and redo one crystal head in sequence at the other end of the core line, and then test again. If the fault disappears, you do not have to redo the crystal head at the other end, otherwise, you have to cut off the original crystal head at the other end and redo it. Until the test is completely green.

Ii. Patch Cord rules for network cables

The above is the simplest method for creating a straight-through network cable. This type of network cable is usually only used for connecting from a hub (switch), a wall information module to a workstation, it is not an ideal method. The main reason is that this network cable does not take into account the crosstalk between core wires, which has a greater impact on high-speed networks (such as over Mbps networks. To this end, the IEEE Standards Board has developed several jumper methods for specific purposes, which are described below.

The Cabling Standards of twisted pair wires in the network are as follows:

(1) One-to-one matching method. That is, the core wires at both ends of the twisted pair must correspond one by one, that is, if the 1st feet at one end are green, the 1st feet at the other end must also be green core wires, the twisted pair wires are usually called "direct connections ". However, it should be noted that the four core wires are normally not separated, that is, the two core wires of the core wires are normally arranged adjacent to each other. This network cable is generally used for the connection between a hub or switch and a computer.

(2) 1-3, 2-6 crossover method. Although the twisted pair has four to eight cores, only four of them are used in the network, that is, 1st, 2nd, 3rd, and 6th of the crystal head, they play the role of receiving and sending signals respectively. The core line of this crossover network cable is arranged as follows: the 1st feet at one end of the network cable connects the 3rd feet at the other end, and the 2nd feet at one end of the network cable connects the 6th feet at the other end, and the other Feet match one by one. This sort is usually called a cross line. Shows the pin numbering rules of the crystal head.

　　　　　　　　　　　　　　　　　　　　

　

For example, when the core line at one end is in the order of white green, green, white orange, blue, white blue, orange, white Brown, and brown, the core line sequence from left to right on the other end should be: White orange, orange, white green, blue, white blue, green, white Brown, and brown. When the core line at one end is from left to right: White orange, orange, white green, blue, white blue, green, white Brown, and brown, the core line sequence from left to right on the other end should be: white green, green, white orange, blue, white blue, orange, white Brown, and brown. This type of network cable is generally used in the case of cascade connections between a hub (vswitch), connections between a server and a hub (vswitch), and direct connections to an equivalent network computer.

(3) M access method. This is a common rule for creating network cables. The so-called M access method refers to the communication rate that can meet the bandwidth of M. Although its connection method also corresponds one by one, the color of each foot is fixed, specifically: 1st feet -- orange white, 2nd feet -- orange, 3rd feet -- green white, 4th feet -- blue, 5th feet -- blue white, 6th feet -- green, 7th feet -- brown white, 8th feet -- brown, it can be seen that the four core Cables of the network cable are not all arranged adjacent. the 3rd, 4th, 5th, and 6th are composed of two core cables, but the order is disordered. In fact, this patch cord rule is exactly the same as the information module end-to-end Method B described below. Of course, we can re-arrange the core line order by the information module end-to-end method A, that is: 1st feet -- green white, 2nd feet -- green, 3rd feet -- orange white, 4th feet -- blue, 5th feet -- blue white, 6th feet -- orange, 7th feet -- brown white, 8th feet -- brown. However, the selected method must be the same as that of the information module described below. Otherwise, the network cable may be disconnected.

This wiring method is also applied to the connection between the Hub (switch) and the workstation computer, that is, the scope of the application of "Direct Connection.

Iii. Information module jumper rules

The patch cord rules of twisted pair cables are introduced above, because in enterprise networks, the cable head is not directly inserted into the hub or switch, instead, the network cable from the hub or switch is first connected to the information module and buried on the wall. This involves the core line arrangement sequence of the information module, that is, the Jumper rule.
The network cable connection method between a vswitch or a hub and a network module is based on the EIA/TIA 568 standard of the municipal line, however, because of its a and B End-to-End methods (IBM products usually use a, aAt & T products usually use B, the main difference between the connection mode is the following t568a module and the internal connection mode of the t568b module ). The wiring sequence of the two connection modes is shown in table 1:
Although the network cable from the hub or switch to the workstation can be a direct connection without any jumper, to ensure high performance of the network, it is best to adopt the same end connection mode for the same network, including the information module and the cable crystal head. The left and right of the sequence 6 corresponding to each pin of the crystal head and information module are shown in the figure. Because the corresponding color labels are available in each cable slot of the information module, you only need to select the corresponding connection mode, then, the core cables are inserted into the corresponding groove according to the color labels on the module. You do not need to remember the color sequence.

　　　　　　　　　

　

[Description] The sequence 1, 2, 3, 4, 5, 6, 7, and 8 in Figure 7 is not set at will. It is in the upward direction of the crystal head with Metallic shrapnel, plastic clip down, insert a head of the RJ-45 seat outward, from left to right for 1, 2, 3, 4, 5, 6, 7, 8 feet. The pin sequence 6 of the information module is clearly marked on the right.

IV. Creation of information modules

After learning about the Jumper rules of the above information module, we can use the materials and cabling tools introduced in the previous article to create an information module. The procedure is as follows:
Step 2: Use a wire stripping tool to strip the outer foreskin of the twisted pair around 1st length at one end of the twisted pair. As shown in

　　　　　　　　　　　　　　

　

Step 2: if there is an information module threading protection device, you can embed the information module into the protection device, as shown in.

　　　　　　　　　　　　　　

　

Step 2: Separate the four pairs of twisted pair wires. However, in order to facilitate differentiation, it is best not to split the core wires, but to separate them only when the core wires are mounted. According to the color sequence of the core line indicated on the information module, the two hands flat a small segment of the corresponding core line, with a slight force to wire one by one into the corresponding wire slot, as shown in.

　

　　　　　　　　　　　　　　

　

Step 2: After all the core wires are embedded, you can press the core wires into the trough with a threading clamp. (You can also press one of them in step 3 to press one with the threading clamp, but it is less efficient) to ensure good contact, as shown in. Then cut off the extra lines outside the module.

　

　　　　　　　　　　　　　　

　

[Tips] Generally, the information module is marked with a color line sequence of TIA 568-a and TIA 568-b at the same time. It should be subject to the requirements of the wiring design, use the same line sequence as other connections and devices.
Step 2: add the plastic dust-proof sheets of the information module to the twisted pair along the gap and fix them on the information module, as shown in. After pressing the gap, the whole process of making the module can be completed. Then, put the created information module into the information outlet.

　　　　　　　　　　　　　　

　

After the information module is created, you can also test whether the connection is good. At this time, you can use a multimeter for measurement. Place the Multimeter in the resistance position of x10, and contact one watch needle of the wanzhi beads with the corresponding core wire at the other end of the network cable, the other 10 thousand uses the table pen contact information module to card the edge of the card trough of the corresponding color core line (note that it is not the contact core line). If the resistance value is very small, it indicates that the information module is well connected. Otherwise, press the corresponding core line with the threading clamp, until smooth.