About the production of crystal head network cable, who has ever seen such a problem!

The landlord you seem to have made a mistake, not orange and white, but white and orange, the general home users are configured according to the ** line and network cable, if you have these sockets, the landlord is absolutely no problem. Okay, now that we've finished talking, we're ready to make the specifications for the network cable. They are usually made from straight and crossed lines.

1.How to create a direct connection.

That is, the cores at both ends of the twisted pair should correspond to one to one If the first one end is green, the first one at the other end must also be a green core, and the twisted pair that comes out of this way is usually called a "direct cable". However, it is important to note that the 4 chip pairs are usually not separated, i.e. the two cores of the core pair are usually arranged next to each other.

Direct line specification diagram.

If two computers are connected directly through a network card, or if a computer is connected to a switch, a pass-through cable should be used.

2.How to make crossed lines.

The arrangement rules are that the first pin at one end of the network cable is connected to the third pin at the other end, the second pin at one end of the network cable is connected to the 6th pin at the other end, and the other pins can correspond one by one. This arrangement is often called a "cross line".

Cross line gauge circumference.

Although twisted pair has 4 pairs of 8 cores, in fact, only 4 of them are used in the network, namely the 1st, 2nd, 3rd and 6th pins of the crystal head, which play the role of receiving and sending signals respectively. It is on this principle that the crossing line begins.

If it's a switch-to-switch connection, you should use crossovers.

How to make a crystal head? This is easy to answer, just go through the above above.

Use the stripping knife edge of the crimping pliers to cut the outer protective sleeve of the Category 5 wire (you should hold the handle of the tool pliers and rotate the copyright with the twisted pair as the center of the circle during operation, and be careful not to cut the insulation layer of the twisted pair wire inside), and the knife edge is at least 3 cm away from the end of the Category 5 wire to facilitate the production later.

As you know, the twisted pair cable will contain a soft nylon rope.

In addition, after stripping off the shell, you should first check whether the pair is on the inside. When you find a scratch on it, you should cut it short from the scratch and re-peel the twisted pair shell. Because the transmitted data is transmitted on the surface of the twisted pair wire, damage to the surface of the wire may affect the transmission rate.

After exposing the 4 pairs of twisted pair cables in the 5 types of cables, rearrange the 4 pairs of cables according to the specifications for making network cables introduced earlier.

When rearranging, it is necessary to pay attention to the flat and neat parallel arrangement of the 8 wires, and it is best to cut them neatly with crimping.

Eight insulated wires, arranged in a neat row, were compacted along the depression of the RJ-45 plug. Insert the aligned pairs into the crystal head.

Finally, put the network cable head into the socket on the network cable pliers, and then press it firmly so that the end of the network cable is tightly attached to the outer skin of the network cable. In this process, the pins protruding from the outside of the crystal head are all pressed into the crystal and the head, and a slight "pop" sound is heard after the force is applied. At this point, a complete network cable is ready.

And what you have above is simply upside down, and the real method of making it is like this.

What does this mean, it means that the automatic jump function of the interface of the computer network card or switch has a problem, the current network card interface has an adaptive function, automatically identify the cross line or direct connection line, and then automatically jump inside, this strange problem is likely to be a problem with the network card, try a different network card.

What's so strange about the different interface definitions, you try the following connection: the crystal head at the end A is arranged in order: white orange, orange, white-green, blue, white-blue, green, white-brown, brown, b-end crystal head, arranged in order, orange, white-orange, white-green, blue, white-blue, green, white-brown, brown.

The normal 100 trillion line can't be used to show the fork? What does it mean to show that the network is disconnected? The fork indicates that the line is not passable, has the line tester tested?

The first time I saw it, what kind of switch was it?

The practice of RJ45 crystal head of the network cable (that is, the connector of the 8-core network cable).

1。Dial the outer skin of the network cable: cut the network cable 3-4 cm away from the outer leather knife ring of the crystal head pliers, do not cut through, and then twist it to dial it off Don't hurt the line.

2。Line sequence: Straighten the 8 cores and sort them by the following colors:

1 orange-white, 2 orange, 3 green-white, 4 blue, 5 blue-white, 6 green, 7 brown-white, 8 brown (this is the standard line sequence for 568b).Neatly lined up. Reserve the length of centimeters and cut it with a cutter.

3。Place the crystal head flat side up. Insert the neatly arranged threads into the crystal head, and look at the top of the crystal head below so that you can see all 8 threads to the end. Then put the crystal head into the pliers and press it firmly. The other end does the same.

PS: The lines that come out of this way are parallel. Ideal for PC-to-router or hub connections.

The other type of wire is the crossed line, which is used as a direct connection from the computer to the computer. The same method is the same as above, but the line order at one end of the line becomes 1 green-white, 2 green, 3 orange-white, 4 blue, 5 blue-white, 6 orange, 7 brown-white, 8 brown (this is the standard line order of 568a).

There are 2 types of connections.

568b orange white, orange, green white, blue, blue and white, green, brown and white, brown and white 568a green and white, green, orange and orange, blue and white, orange, brown and white, brown and brown are generally connected with 568b. Arrange them according to the color and cut them into the crystal head. Pressed with crimping pliers, batch crimped with crystal head crimping machine***.

rj11The interface is similar to the RJ45 interface, but only has 4 pins (8 for RJ45). In computer systems, RJ11 is mainly used to connect modem debugging demodulators. In everyday applications, RJ-11 is commonly found in ** lines.

Production:

Crafting Tools:

Wire pliers: used to connect the crystal head (required).

Regarding the practice of crystal heads, because the color code and arrangement method of twisted pair wires are strictly regulated by unified international standards, so when doing it, it is good to remember the standard, and now the commonly used is TIA EIA568B.

rj-11 rj-15

The standard of practice of the crystal head:

568A Standard: White-Green, Green, White-Orange, Blue, White-Blue, Orange, White-Brown, Brown.

568B standard: white orange, orange, white-green, blue, white-blue, green, white-brown, brown.

General principles of practice:

Homogeneous (both ends of the cable are the same device) cross (do crosswire).

Heterogeneous (two ends of the connection line are different devices) parallel (made parallel lines).

Note: When making the crystal head, make the shrapnel of the crystal head face outward, the wire inlet face down, from left to right, follow the above line sequence, fully insert the wire (to see the copper core of the twisted pair at the top of the crystal head as the standard), and then clamp it with a network cable pliers, and you can do it.

There are two kinds of Ethernet twisted pair cables: one is the widely used straight connection line, the other is the cross wire used in special circumstances, if it is a PC connection switch or other network interfaces, etc., or if the status of the two parties of other connections is not equal, a straight connection line is used, and if the two devices connected are equal, such as two PCs, laptops, etc., it is necessary to use a cross wire, the difference between the two is that the line sequence is inconsistent, and the interface is the same.

The practice of crossing the line is: 568A standard at one end and 568B standard at the other end.

The practice of parallel lines is to use the same standard at both ends (both 568A or 568B).

The essentials of making the crystal head of the network cable are in one word: the line should be straightened!

A lot of electricians do very good electricity, but the weak electricity is very general, I have been in contact with several is not to hit the crystal head, I am also very speechless to them, let's talk about the production method of the network cable crystal head:

When we use the peeling function of the network cable pliers to peel off the outer skin of the network cable, we will see eight metal wires intertwined with each other. Orange, green, blue, brown four colors, and they are intertwined with white orange, white green, white blue, white brown, some slightly orange, some just white, if it is a solid color, you must be careful, do not confuse the four white. Let's remove their entanglements separately, noting that the order of placement is:

Orange-green-blue-brown, white first, blue-green interchangeable. That is to say, the end result is: white orange, orange, white green, blue, white blue, green, white brown, brown (suitable for computers and routers, dial-up modems, switches).

After the position is placed, the network cable is laid flat and straight, and the tangent knife is used to cut it together, the usual network cable pliers of the tangential knife are available, be sure to cut neatly, and then put it flat into the crystal head, and push it forward, when the line is neatly arranged from the front of the crystal head, use the crystal head pressing module of the network cable pliers to squeeze it.

This sequence of network cable production is a common Class B network cable production method.

If it is a class A network cable, the production order is orange and green, becoming: white-green, green, white-orange, blue, white-blue, orange, white-brown, brown.

The direct connection line is the crystal head at both ends of the network cable, which is A or B, and if it is a cross line, one end is A and the other end is B.

Direct connection (suitable for computers and routers, dial-up modems, switches).

Both ends are white-orange, orange, white-green, blue, white-blue, green, white-brown, brown.

Cross-connect one end 568A and one end 568B (for PC-to-PC).

568A standard: green-white, green, orange-white, blue, blue-white, orange, brown-white, brown-white.

568b standard: orange-white, orange, green-white, blue, blue-white, green, brown-white, brown (generally use this).

The following common situations require direct connection, such as: computer and switch interconnection, switch and router interconnection. If it's a computer and compute interconnection, you need to cross the wire.

Of course, these network cable production methods are not necessarily used by everyone. Because many network designers usually do not strictly follow this rule, but if they do not follow this rule, the anti-interference and anti-attenuation performance of the network cable will be very poor. It is recommended that designers strictly follow this order to ensure the optimal operation of the network.

Therefore, if we go to repair the network, we must take a good look at the original old crystal head in what way to make it, we do it in its order, because we are just making a crystal head, so we must "follow the local customs", otherwise, we must open the knife at both ends, and make it again in accordance with the standard. In addition, the length of the network cable should not be greater than 100 meters, because the longer the model, the more attenuation.