It only uses four wires for network cables, why are they all eight wires?

Ordinary network cables are divided into two kinds, one is machine-to-machine, and the other is machine-to-hub, which is both the same equipment and the other is different equipment. First, there are two crystal heads for network cables, and different network cables have different practices for crystal heads.

There are two common methods of crystal heads, one is 568a, one is 568b, and the crystal head of the same equipment is composed of two crystal heads, one 568a and one 568b. The different devices consist of one or two 568A or 568B heads.

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

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

10M Ethernet uses 1, 2, 3, and 6 cores to transmit data, and 100M Ethernet uses 4, 5, 7, and 8 cores to transmit data. For example, a pair of twisted wires can be used to transmit voice, such as ** cables can be carried on the network cable to transmit together, which makes the wiring easier.

Eight copper wires, in order to reduce the mutual interference of electromagnetic signals, each two are wound together according to a certain density. In this way, the radio waves radiating from each other during the transmission of electrical signals will cancel each other out, effectively eliminating interference. The name twisted pair is also derived from this structure.

On the outside, there is a layer of toughness and high protection of the outer skin. The earliest use of twisted pair is used for the transmission of the first signal, and then it was gradually introduced into the transmission of digital signals, a long time ago, we are basically using 3 types of twisted pairs, the maximum bandwidth can only reach 16mbps, and now we are widely used in computer networks are super five types of twisted pair and six types of twisted pair.

The maximum bandwidth can reach 1000Mbps. The only disadvantage of twisted pair is that the transmission distance is short, which can only reach 100 meters, so when wiring, if you use star topology, the coverage range can only reach 200 * 200 meters 1000m network card data transmission is bidirectionalFour pairs of wires are required, i.e. 8 cores. There are only 4 sticks under 100m.

The data transmission of the 1000M network card is bidirectional, and four pairs of wires are required, that is, 8 cores.

The 10M Ethernet cable connection uses 1, 2, 3, and 6 cores to transmit data, and the 100M Ethernet cable connection uses 4, 5, 7, and 8 cores to transmit data. The eight wires are designed to accommodate a wider range of uses, and can meet the network cable wiring requirements of a wide variety of user equipment without changing the infrastructure.

The network cable is generally a twisted pair, which is vertically wound with each other, which can effectively resist the electromagnetic interference between the lines.

Four are used for sending and receiving, and the other four are backup network cables.

The network cable commonly used at home is called "twisted pair", which consists of 8 wires of different colors, and generally only uses numbered cores to transmit data, that is, for sending and receiving.

By color:

Orange and white and orange are used for sending;

Green and white and green are used for receiving;

The other colors are two-way lines.

For example, there are only four network cables, but some network cables have eight, but the role is also different, like four network cables are generally used to transmit about 10 trillion broadband network, but eight network cables are generally used to transmit about 100 trillion broadband network. Therefore, the number of different network cables also affects the broadband speed, and the eight network cables can also reduce the interaction of electrode signals, which is one of the reasons why he can transport a higher network speed and a larger network speed. Another reason is that the number of them is different, because four network cables belong to a type of Category 3 network cable, but eight network cables belong to a category 5 network cable.

And the color of the network cable is also different, the four network cables are generally pure white, as well as orange and green, as well as green, white The four colors are composed, but in addition to these four colors, the eight network cables are still brown, brown and white, as well as blue and blue and white, these four colors. The eight network cables will also have four network cables as a certain backup, to prevent the influence of each other, as well as the interference between the outside world. <>

Therefore, the network speed of eight network cables is also relatively stable, and the network speed of four network cables is relatively stable in short-distance transportation, but if it is said that long-term transportation is encountered, then it is likely to be affected to a certain extent, and there may be a decrease in network speed, which is why some high-speed and stable networks now use eight lines. Therefore, some people also choose some eight-wire and four-wire in the selection of network cables, but to choose network cables still according to their own real situation. <>

If it is a long distance, then it is recommended to choose 8 lines, because it can be more stable to transport a certain network speed, thereby reducing the decline of network speed, but to choose short-distance transportation, just like the network cable from the living room to the bedroom, then go to choose the four-line line, because there is no influencing factor, it will have a certain impact on the network speed, which is the reason for the different choice of network cables.

The existence of the four-core network cable is to save costs, which is equivalent to a simplified version of the five-type line, which is mainly used to connect **, or to some places where the bandwidth is less than 100m and the requirements for the network are not so high.

This is the difference on the main chain of network cables, 8 network cables will obviously travel faster.

Generally speaking, the specifications of the network cable are different, which is also related to the speed of the optical fiber in the home.

The home network cable is called "twisted pair", a twisted pair is composed of 8 thin wires and a tensile wire, 4 of the 8 network cables are used for sending and receiving, and the other four are spare cables, so some people only like to connect four wires and not spare cables.

Therefore, the two are a kind of network cable, and there is no difference in essence. Only the numbered cores are used to pass the data, i.e. for sending for receiving.

By color:

1. Orange and white and orange are used for sending;

2. Green and white and green are used for receiving;

3. Other colors are two-way lines.

The difference between four and eight network cables is that the size and quantity of the transmission bandwidth and the color of the network cable are different.

1. The size of the broadband used to transmit is different:

The 4 network cables are generally used to transmit network broadband of about 10m. The 8 network cables are generally used to transmit and lose the network broadband of about 100m.

2. The quantity is different

There are generally two pairs of 4 network cables, which belong to the third class of network cables; There are generally four pairs of 8 network cables, which belong to the five types of network cables.

3. The color of the network cable is different from the old mountain

The colors of the 4 network cables are generally orange-white, orange, green-white, and green; The colors of the 8 network cables are generally orange and white, orange, green and white, blue, blue and white, green, brown and white, and brown.

Does connecting 4 network cables affect the network speed?

If there are only four network cables, if it is in a 100 Gigabit network, it will not affect the network speed, but if it is in a Gigabit network, then the impact will be very serious. Moreover, only four network cables are not up to standard, unless it is used in very special circumstances or temporarily, it should be regarded as unqualified wiring. The four network cables can only support the transmission rate of 100 Gigabit, and the bandwidth is only 10 times that of the original Gigabit network, and if the network cable is the main line, then the entire Gigabit network will degenerate into a 100 Gigabit network.