What is the standard of network cable 568B junction? What does the standard 568A and standard 568B m

Production of 568A and 568B international standard network cables.

Twisted pair lines 568a and 568b. It specifies the order in which 8 thin wires of different colors within a twisted pair are inserted into the crystal head from left to right.

Standard 568a: Green-White-1, Green-2, Orange-White-3, Blue-4, Blue-White-5, Orange-6, Brown-White-7, Brown-8.

Standard 568B: Orange-White-1, Orange-2, Green-White-3, Blue-4, Blue-White-5, Green-6, Brown-White-7, Brown-8.

That is, direct line: 568b-568b, 568a-568a, cross line: 568a-568b

When making the RJ45 head, it only ensures that the order of the two ends of the line corresponds one-to-one, but it does not follow the 568A 568B cable standard. Although it can be connected to the network, the anti-interference of this kind of line is poor, and there may be situations such as slow transmission speed and good and bad network.

When making network cables, it is recommended to do them according to the standards, and according to the actual engineering experience, the length of the network cable should not be less than meters, which is necessary to improve the stability of the network.

If the two parties to the connection are not equal, use parallel wires (568a or 568b), such as a computer connected to a router or switch.

If the two connected devices are equal, use a crossover wire (568a at one end and 568b at the other), such as a computer connecting to a computer.

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.

Note: This order refers to the crystal head inlet mouth downward, the shrapnel outward, and the metal foot facing itself from left to right, as shown in the picture above.

The main difference between 568a and 568b is that the order of the lines is different, and the corresponding standard is selected according to the different connected devices.

First, the order of the wiring is different.

A: The 568A is arranged in the order of white-green, green, white-orange, blue, white-blue, orange, white-brown, and brown.

B: 568b is in the order of white orange, orange, white green, blue, white blue, green, white brown, and brown.

Second, the application is different.

568A: 568A is mainly used for crossings.

568B: 568B is mainly used for parallel (straight-through) lines and crossed lines.

Third, for different.

568A: The 568A is connected to the hub for two computer interconnects or ADSL modems.

568b: The 568b is connected to a switch or hub for a computer.

The line order is different. In general, we think that 568B is better shielded.

The order of the 568a from left to right is: white-green, green, white-orange, blue, white-blue, orange, white-brown, brown.

568b is: white orange, orange, white-green, blue, white-blue, green, white-brown, brown.

The so-called crossover wire refers to a twisted pair with a 568A standard at one end and a 568b standard at the other end. A direct line refers to:

Both ends are 568A or both are 568B standard twisted pairs. By the way, when many friends make RJ45 heads, they only ensure that the order of the two ends of the line corresponds one-to-one, but they do not follow the 568A 568B cable standard. Although it can be connected to the network, the anti-interference of this kind of line is very poor, and there are often situations such as slow transmission speed and good and bad network.

I hope that you must do it in accordance with the standard when making network cables, and according to the actual engineering experience, the length of the network cable should not be less than meters, which is very necessary to improve the stability of the network!

Let's take a look at how to choose the right direct and twisted pair cables. A direct connection is required when the following devices are interconnected:

Connect the switch or hub with the router;

Computers, including servers and workstations, are connected to a switch or hub.

When these devices are interconnected, they need to use crossed wires

The switch is connected to each other through the UPLINKS port.

The hub is connected to the switch;

hub-to-hub connections;

Two PCs are directly connected;

The connection of the router interface with the interface of other routers;

ADSL of the Ethernet interface

The modem is connected to the network card interface of the PC.

The equipment on the same layer is connected in reverse.

The different layers of equipment are connected directly with each other.

The line sequence is as follows:

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.

Orange White Orange Green White Blue Blue Blue White Green Brown White Brown.

The wiring standard of the EIA TIA specifies the wire sequences 568A and 568B for the two twisted pairs.

Standard 568a: green-white-1, green-2, orange-white-3, blue-4, blue-white-5, orange-6, brown-white-7, brown-8;

Standard 568B: Orange-White-1, Orange-2, Green-White-3, Blue-4, Blue-White-5, Green-6, Brown-White-7, Brown-8. A cabling method is applied in the entire network cabling, but the network connection with RJ45 terminals at both ends is common in the network, whether it is terminated in mode A or in termination mode B.

In practice, most of them use the T568B standard, which is generally considered to be better shielding against electromagnetic interference.

In fact, the commonly used 10m and 100m networks, the real use of only four cores and 6, the other four are spare lines, so many people make the so-called 4 core network cable is also this meaning. The network cable made according to the 568a or 568b standard line sequence is to ensure a standard and compatibility of large networks, if it is only a network for your own use, theoretically as long as the line sequence at both ends is the same, you can access the Internet in any order, of course, compatibility can not be guaranteed.

Commonly used network cable crystal head line sequence:

Standard 586B: 1 Orange White, 2 Orange, 3 Green White, 4 Blue, 5 Blue White, 6 Green, 7 Brown White, 8 Brown.

Steps of connecting the crystal head of the network cable:

1. Use crimping pliers to cut off the rubber of the network cable about 2cm long.

2. Arrange the network cables according to the standard 586b standard line sequence, as shown in the following figure.

3. Cut the ends of the 8 strands together. Insert the one end of the crystal head with a plastic spring sheet downwards and the one end with metal pins upwards, insert a neat 8-strand wire into the crystal head, and make it tightly against the top leaky end.

4. Insert the crystal head into the 8p slot and hold the crimping pliers firmly!