Why some network cables only have 4 branches, red, green, yellow, white 10

568A 568b line sequence.

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 cable (dual-machine direct connection) refers to a twisted pair cable with 568A standard at one end and 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:

1.Connect the switch or hub with the router;

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

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

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

2 hub is connected to the switch;

3. Hub-to-hub connection;

4 Two PCs are directly connected;

5. The connection between the router interface and other router interfaces;

6 The ADSL modem of the ethernet interface 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.

When docking network cables, careful friends will find that some network cables only have four wires, which are orange, orange and white, blue, blue and white, but the interface that needs to be docked has eight lines, how to solve this problem?

In fact, it is very simple, the working principle of eight wires and four wires is the same, in actual use, four lines of the network cable of eight wires actually do not work, so as long as the four wires are connected to the corresponding interface. The standard crystal head connection method is shown in the figure below, both standards can be, but the two ends should be the same (use more 568b):

In practice, in a 100 Gigabit network, only 1236 from left to right is used. So since you only have 4 cores of the network cable, just insert the 4 cores in order and press them down (as long as the order of the two ends is the same).

It should be noted that the colors of some **common sense production will be different, and it takes several appropriate tests to determine the positive and negative situations, and do not mess up the order of the network cable when testing, otherwise it is easy to distinguish clearly.

It is recommended to transfer through an adapter.

1. Eight threads to make crystal heads.

T568B can be used at both ends of the network cable used at home.

T568B Line Sequence:

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

1. Use wire cutters to peel off the outer skin of the network cable.

2. Arrange the network cables according to the T568B line sequence.

3. Insert the network cable into the crystal head, and pay attention to each one to the front of the crystal head.

4. Put it in the network cable pliers, press it hard, and you can hear the soft sound of "click".

5. Use a line tester to test whether the network cable is unobstructed.

Two or four threads are used as crystal heads.

The T568B line sequence is also used.

Orange white orange green white green.

The positions are 1, 2, 3, and 6 of the crystal head, and the steps are the same as those of the eight network cables.

After the two crystal heads are made, connect them to the adapter and wrap the adapter with insulating tape to ensure that they will not loosen and fall off.

Connect 1236, the standard network cable is orange, white orange and green, white and green are effective, and the 8-core network cable is connected to orange-white-orange, green-white-green, and then the four-core on the other end can be connected to the 4 wires of the 8 cores in any order, just do it.

Docking according to the color corresponding to the network cable is OK.

White Orange *****=== White Orange.

Orange *****=== Orange.

White-green *****=== white-green.

Green *****=== Green.

Thread the same colored wire on both sides into the connector, and then press the connector.

The remaining four network cables, white blue, blue, white brown, brown. Don't pick it up.

8 on both sides of the line can have the same network formal wiring two ways to live their own mother.

4 wires connected 1 2 3 6 both sides of the line sequence can be.

The network cable is not four white.

Actually, these four wires are flowers, which should be white-blue, white-green, etc., and are used to form twisted pairs with the corresponding colors.

Each line has its own purpose, it must not be connected randomly, the common method is 568a and 568b, look at the encyclopedia.

The 4 white wires of the network cable and the other 4 colored wires are pairs of twisted pairs, and the wiring, especially when making the crystal head of the network cable, can not be connected randomly. According to the T568B standard wiring, which is commonly used in chromatography, a search can find such a wiring diagram.