Why is the network interface an RJ45 connector instead of a USB interface?

Why is it called the RJ45 connector? This statement is actually imperfect and should be called the 8P8C connector.

Refers to a cable termination module with 8 contacts in 8 positions.

RJ45, or RJ45s to be exact, refers to only pins 4 and 5, that is, the white and blue lines and blue lines in the middle are connected to 8P8C for voice calls. Similarly, there are a series of other connection methods such as RJ48 and RJ48s, which all use 8P8C connectors.

For example, if the serial cable often used in the debugging process of network equipment is made by a very formal manufacturer, you will find that the color order of the core wire and the network cable in the plug is different.

If you say "RJ45", you should call the network cable plug T568B plug.

8P8C is actually a product of Bell Labs' modular phone design in the 1960s. It was also introduced with connectors such as 4P4C, 6P4C, and even 12P12C. The design was mainly used for analog signal propagation until T1. The line borrows 8P8C for data transmission in the form of RJ48, and 8P8C has become a well-known network cable plug.

Such plugs are actually limited in design. Crosstalk occurs between parallel metal sheets at high frequencies.

This makes the network cable using this connector can carry electrical pulse frequencies up to 200 MHz. Therefore, the seven-category line running 500-1000 MHz is not recognized by TIA due to the problem of this connector, and is not listed as a real communication line standard.

In order to take advantage of Category 7 cables, some manufacturers are making new connectors, such as GG45

This connector places 8 wires on the four corners while maintaining the basic physical specifications of the 8P8C. In this way, the problem of crosstalk is temporarily solved.

However, there are few households in the market that support GG45, so many do not know about this high-speed network connector.

And more radical

It is called TERA, and the form is completely different from the previous one. It does not consider compatibility issues and directly runs a 1GHz signal. This thing also has no network equipment to use. However, the advantages of the fast TERA interface have been favored by the audio and video industry, and many professional audio and video equipment are now using this interface.

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