How to judge whether the access is a 100M or Gigabit network?

A friend has been asking how to quickly identify the Category 5 or Category 6 line. This time we have related methods to understand.

First, what is the difference between Gigabit Ethernet cable and 100M Ethernet cable?

Gigabit network cable refers to the network cable suitable for Gigabit network, and 100M network cable is the network cable suitable for 100M network. If it is divided according to the specific wire, the general Gigabit cable refers to the six types of network cable and the super five network cable. The 100M network cable refers to the five types of network cables.

The super five network cable is generally applied to the 100 Mbps network cable to realize the connection of the desktop switch to the computer. If the super five types of network cable is used as a gigabit network cable, the required accessories are expensive and the cost is relatively high. When used in a Gigabit network, the six types of lines are directly used instead of the super five types of network lines, and the six types of network lines can be compatible with a 100 Mbps network.

If the 100M network has the intention of upgrading the Gigabit network, it is recommended to use the six types of network cable cabling. When upgrading the network, there is no need to re-arrange the network cable.

In the 100M network, in the process of transmitting network signals, the network cable only uses orange-white-1, orange-2, green-white-3, and green-6, which are the four cores, that is, even if other 4 cores are not used, and network signals can be transmitted under a 100M network.

Although theoretically, a 100-Mbps network should use an 8-core network cable to maintain stable transmission over long distances. However, at present, most routers still have only four contact pads to identify the network cable, and it does not cause much during transmission. Big problem.

In the Gigabit network, when the network cable transmits the network signal, it must use 8 cores. The four cores of the network cable cannot transmit and receive at the same time as the Gigabit network transmission, that is, the four cores can only realize the Gigabit network. Receiving data or sending data, the two cannot be done simultaneously. When transmitting a Gigabit network, you should also use a Gigabit router (8 sockets have contacts).

Second, the difference between the super five and six types of network cable

Super Category 5: Super Category 5 has low attenuation, low crosstalk, higher attenuation and crosstalk ratio (ACR) and signal-to-noise ratio (Structural Return Loss) than Category 5, and smaller delay error. Great improvement.

Category 6 line: The transmission frequency of this type of cable is 1MHz ~ 250MHz. The Category 6 wiring system should have a large margin in the integrated attenuation crosstalk ratio (PS-ACR) at 200MHz, which provides twice the bandwidth of the Super Category 5. The transmission performance of Category 6 cabling is much higher than the Category 5 standard and is best suited for applications with transmission rates above 1Gbps.

An important difference between Category 6 and Category 5 is that it improves performance in terms of crosstalk and return loss. For a new generation of full-duplex high-speed network applications, excellent return loss performance is extremely important. The basic link model is eliminated in the six types of standards. The cabling standard adopts a star topology. The required cabling distance is: the length of the yong long link cannot exceed 90 m, and the channel length cannot exceed 100 m.

The biggest difference between the five types of network cables and the six types of network cables is their internal structure and performance. The internal structure of the super five types of network cables is only four pairs of twisted pair copper wires.

The six types of network cables add a cross skeleton to the structure, mainly to reduce crosstalk between pairs, and achieve six types of network cable standards. Most of the six types of network cables have cross-frames, and a small number of six types of standard network cables can be reached. Is a word skeleton or no skeleton.

Third, how to distinguish between 100 megabytes or gigabits through equipment

As shown in the figure below, each network port has two green lights on the left and right. The left side lights up to indicate the 100M rate, and the right side lights up to indicate the 10M rate. When both lights are on, it indicates that the 1000M device is connected. Of course, switches, network cables, and devices connected to the switch support 1000M, and this 1000M will be on.

Fourth, the difference between the 100 Mbps and Gigabit network cable

One end is: 1 orange white, 2 orange, 3 green white, 4 blue, 5 blue white, 6 green, 7 brown white, 8 brown (568B)

The other end: 1 green white, 2 green, 3 orange white, 4 brown white, 5 brown, 6 orange, 7 blue, 8 blue white (not 568A)

5. Is the 100M network cable the same as the crystal head of the Gigabit cable?

If you use a Gigabit cable, you must use a Gigabit crystal head. Many people will ignore this and think that the crystal head is the same. In fact, there are differences, as shown in the figure: 100 megabytes on the left and Gigabits on the right. You can see that there are differences in the structure between the 100 megabytes and the gigabit.

The super five types of network cables and the six types of network cables are the same in size and size. However, the copper core sizes of the super five and six types of network cables are different.

The size of the copper core of the super five types of network cables is about 0.45 to 0.51, and the copper core size of the six types of network cables is about 0.52-0.58. The copper core of the six types of network cables is thicker than the copper core of the super five types of network cables. Because the copper cores of the two are different, the holes in the crystal head are also different.

The crystal heads of the six types of network cables are arranged in a wrong layer, which is divided into two rows, four on the top and four on the bottom. The crystal heads of the super five types of network cables are arranged in a straight line.

Is the crystal head of the 100-megabit cable and the Gigabit cable the same? The answer is yes, the method is exactly the same.